char = S;code = 83 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = u;code = 117 char = d;code = 100 char = i;code = 105 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = -;code = 45 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = e;code = 101 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = f;code = 102 char = f;code = 102 char = u;code = 117 char = s;code = 115 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = p;code = 112 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = (;code = 40 char = d;code = 100 char = i;code = 105 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = s;code = 115 char = i;code = 105 char = l;code = 108 char = o;code = 111 char = x;code = 120 char = a;code = 97 char = n;code = 110 char = e;code = 101 char = );code = 41 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = s;code = 115 char = .;code = 46 result sql = Single molecule studies of solvent-dependent diffusion and entrapment in poly(dimethylsiloxane) thin films.
Single molecule studies of solvent-dependent diffusion and entrapment in poly(dimethylsiloxane) thin films.char = S;code = 83 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = c;code = 99 char = r;code = 114 char = o;code = 111 char = s;code = 115 char = c;code = 99 char = o;code = 111 char = p;code = 112 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = r;code = 114 char = o;code = 111 char = s;code = 115 char = c;code = 99 char = o;code = 111 char = p;code = 112 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = d;code = 100 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = o;code = 111 char = y;code = 121 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = b;code = 98 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = y;code = 121 char = s;code = 115 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = p;code = 112 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = d;code = 100 char = y;code = 121 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = d;code = 100 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = -;code = 45 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = (;code = 40 char = d;code = 100 char = i;code = 105 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = s;code = 115 char = i;code = 105 char = l;code = 108 char = o;code = 111 char = x;code = 120 char = a;code = 97 char = n;code = 110 char = e;code = 101 char = );code = 41 char = ;code = 32 char = (;code = 40 char = P;code = 80 char = D;code = 68 char = M;code = 77 char = S;code = 83 char = );code = 41 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = P;code = 80 char = D;code = 68 char = M;code = 77 char = S;code = 83 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = p;code = 112 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = x;code = 120 char = i;code = 105 char = m;code = 109 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = 2;code = 50 char = 2;code = 50 char = 0;code = 48 char = ;code = 32 char = n;code = 110 char = m;code = 109 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = i;code = 105 char = c;code = 99 char = k;code = 107 char = n;code = 110 char = e;code = 101 char = s;code = 115 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = s;code = 115 char = p;code = 112 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = S;code = 83 char = y;code = 121 char = l;code = 108 char = g;code = 103 char = a;code = 97 char = r;code = 114 char = d;code = 100 char = ;code = 32 char = 1;code = 49 char = 8;code = 56 char = 4;code = 52 char = ;code = 32 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = g;code = 103 char = l;code = 108 char = a;code = 97 char = s;code = 115 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = s;code = 115 char = l;code = 108 char = i;code = 105 char = p;code = 112 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = l;code = 108 char = l;code = 108 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = l;code = 108 char = o;code = 111 char = w;code = 119 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = m;code = 109 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = .;code = 46 char = ;code = 32 char = A;code = 65 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = y;code = 121 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = d;code = 100 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = y;code = 121 char = e;code = 101 char = ;code = 32 char = (;code = 40 char = B;code = 66 char = P;code = 80 char = P;code = 80 char = D;code = 68 char = I;code = 73 char = );code = 41 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = b;code = 98 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = f;code = 102 char = f;code = 102 char = u;code = 117 char = s;code = 115 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = -;code = 45 char = m;code = 109 char = a;code = 97 char = t;code = 116 char = r;code = 114 char = i;code = 105 char = x;code = 120 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = <;code = 60 char = b;code = 98 char = >;code = 62 char = T;code = 84 char = W;code = 87 char = O;code = 79 char = ;code = 32 char = C;code = 67 char = L;code = 76 char = A;code = 65 char = S;code = 83 char = S;code = 83 char = E;code = 69 char = S;code = 83 char = ;code = 32 char = O;code = 79 char = F;code = 70 char = ;code = 32 char = D;code = 68 char = Y;code = 89 char = E;code = 69 char = -;code = 45 char = L;code = 76 char = O;code = 79 char = A;code = 65 char = D;code = 68 char = E;code = 69 char = D;code = 68 char = ;code = 32 char = S;code = 83 char = A;code = 65 char = M;code = 77 char = P;code = 80 char = L;code = 76 char = E;code = 69 char = S;code = 83 char = ;code = 32 char = A;code = 65 char = R;code = 82 char = E;code = 69 char = ;code = 32 char = I;code = 73 char = N;code = 78 char = V;code = 86 char = E;code = 69 char = S;code = 83 char = T;code = 84 char = I;code = 73 char = G;code = 71 char = A;code = 65 char = T;code = 84 char = E;code = 69 char = D;code = 68 char = :;code = 58 char = ;code = 32 char = <;code = 60 char = /;code = 47 char = b;code = 98 char = >;code = 62 char = ;code = 32 char = (;code = 40 char = i;code = 105 char = );code = 41 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = o;code = 111 char = r;code = 114 char = p;code = 112 char = o;code = 111 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = d;code = 100 char = y;code = 121 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = u;code = 117 char = g;code = 103 char = h;code = 104 char = o;code = 111 char = u;code = 117 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = s;code = 115 char = ;code = 32 char = (;code = 40 char = ";code = 34 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = ";code = 34 char = ;code = 32 char = s;code = 115 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = );code = 41 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = (;code = 40 char = i;code = 105 char = i;code = 105 char = );code = 41 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = i;code = 105 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = y;code = 121 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = r;code = 114 char = i;code = 105 char = c;code = 99 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = i;code = 105 char = m;code = 109 char = a;code = 97 char = r;code = 114 char = i;code = 105 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = P;code = 80 char = D;code = 68 char = M;code = 77 char = S;code = 83 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = r;code = 114 char = f;code = 102 char = a;code = 97 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = (;code = 40 char = ";code = 34 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = ";code = 34 char = ;code = 32 char = s;code = 115 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = );code = 41 char = .;code = 46 char = ;code = 32 char = E;code = 69 char = x;code = 120 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = i;code = 105 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = m;code = 109 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = n;code = 110 char = i;code = 105 char = t;code = 116 char = r;code = 114 char = o;code = 111 char = g;code = 103 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = v;code = 118 char = a;code = 97 char = r;code = 114 char = i;code = 105 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = ;code = 32 char = l;code = 108 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = l;code = 108 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = o;code = 111 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = p;code = 112 char = y;code = 121 char = l;code = 108 char = ;code = 32 char = a;code = 97 char = l;code = 108 char = c;code = 99 char = o;code = 111 char = h;code = 104 char = o;code = 111 char = l;code = 108 char = ;code = 32 char = (;code = 40 char = I;code = 73 char = P;code = 80 char = A;code = 65 char = );code = 41 char = ;code = 32 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = v;code = 118 char = a;code = 97 char = p;code = 112 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = .;code = 46 char = ;code = 32 char = A;code = 65 char = ;code = 32 char = P;code = 80 char = D;code = 68 char = M;code = 77 char = S;code = 83 char = -;code = 45 char = c;code = 99 char = o;code = 111 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = q;code = 113 char = u;code = 117 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = z;code = 122 char = -;code = 45 char = c;code = 99 char = r;code = 114 char = y;code = 121 char = s;code = 115 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = c;code = 99 char = r;code = 114 char = o;code = 111 char = b;code = 98 char = a;code = 97 char = l;code = 108 char = a;code = 97 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = e;code = 101 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = o;code = 111 char = y;code = 121 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = n;code = 110 char = i;code = 105 char = t;code = 116 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = d;code = 100 char = r;code = 114 char = y;code = 121 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = P;code = 80 char = D;code = 68 char = M;code = 77 char = S;code = 83 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = e;code = 101 char = n;code = 110 char = s;code = 115 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = q;code = 113 char = u;code = 117 char = i;code = 105 char = l;code = 108 char = i;code = 105 char = b;code = 98 char = r;code = 114 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = h;code = 104 char = i;code = 105 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = d;code = 100 char = .;code = 46 char = ;code = 32 char = S;code = 83 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = h;code = 104 char = o;code = 111 char = w;code = 119 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = d;code = 100 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = t;code = 116 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = m;code = 109 char = m;code = 109 char = o;code = 111 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = I;code = 73 char = P;code = 80 char = A;code = 65 char = -;code = 45 char = s;code = 115 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = Q;code = 81 char = u;code = 117 char = a;code = 97 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = v;code = 118 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = d;code = 100 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = f;code = 102 char = l;code = 108 char = u;code = 117 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = s;code = 115 char = p;code = 112 char = o;code = 111 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = d;code = 100 char = u;code = 117 char = c;code = 99 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = m;code = 109 char = m;code = 109 char = o;code = 111 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = p;code = 112 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = i;code = 105 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = m;code = 109 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = p;code = 112 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = n;code = 110 char = o;code = 111 char = n;code = 110 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = a;code = 97 char = r;code = 114 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = I;code = 73 char = P;code = 80 char = A;code = 65 char = ;code = 32 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = .;code = 46 char = ;code = 32 char = E;code = 69 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = I;code = 73 char = P;code = 80 char = A;code = 65 char = ;code = 32 char = s;code = 115 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = p;code = 112 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = x;code = 120 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = ;code = 32 char = g;code = 103 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = z;code = 122 char = e;code = 101 char = r;code = 114 char = o;code = 111 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = g;code = 103 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = ";code = 34 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = ";code = 34 char = ;code = 32 char = s;code = 115 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = F;code = 70 char = l;code = 108 char = u;code = 117 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = r;code = 114 char = r;code = 114 char = e;code = 101 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = r;code = 114 char = o;code = 111 char = s;code = 115 char = c;code = 99 char = o;code = 111 char = p;code = 112 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = p;code = 112 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = f;code = 102 char = f;code = 102 char = u;code = 117 char = s;code = 115 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = e;code = 101 char = f;code = 102 char = f;code = 102 char = i;code = 105 char = c;code = 99 char = i;code = 105 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = y;code = 121 char = i;code = 105 char = e;code = 101 char = l;code = 108 char = d;code = 100 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = u;code = 117 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = D;code = 68 char = ;code = 32 char = =;code = 61 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 4;code = 52 char = (;code = 40 char = +;code = 43 char = /;code = 47 char = -;code = 45 char = 0;code = 48 char = .;code = 46 char = 4;code = 52 char = );code = 41 char = ;code = 32 char = x;code = 120 char = ;code = 32 char = 1;code = 49 char = 0;code = 48 char = (;code = 40 char = -;code = 45 char = 8;code = 56 char = );code = 41 char = ;code = 32 char = c;code = 99 char = m;code = 109 char = (;code = 40 char = 2;code = 50 char = );code = 41 char = /;code = 47 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = v;code = 118 char = i;code = 105 char = r;code = 114 char = t;code = 116 char = u;code = 117 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = e;code = 101 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = I;code = 73 char = P;code = 80 char = A;code = 65 char = ;code = 32 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = s;code = 115 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = l;code = 108 char = a;code = 97 char = s;code = 115 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = I;code = 73 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = l;code = 108 char = u;code = 117 char = d;code = 100 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = n;code = 110 char = o;code = 111 char = n;code = 110 char = z;code = 122 char = e;code = 101 char = r;code = 114 char = o;code = 111 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = p;code = 112 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = d;code = 100 char = y;code = 121 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = y;code = 121 char = s;code = 115 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = p;code = 112 char = p;code = 112 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = P;code = 80 char = D;code = 68 char = M;code = 77 char = S;code = 83 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = t;code = 116 char = r;code = 114 char = i;code = 105 char = x;code = 120 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = p;code = 112 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = h;code = 104 char = i;code = 105 char = g;code = 103 char = h;code = 104 char = ;code = 32 char = I;code = 73 char = P;code = 80 char = A;code = 65 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = t;code = 116 char = r;code = 114 char = i;code = 105 char = b;code = 98 char = u;code = 117 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = m;code = 109 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = c;code = 99 char = r;code = 114 char = o;code = 111 char = p;code = 112 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ,;code = 44 char = ;code = 32 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = o;code = 111 char = r;code = 114 char = p;code = 112 char = o;code = 111 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = r;code = 114 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = P;code = 80 char = D;code = 68 char = M;code = 77 char = S;code = 83 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 result sql = Single molecule microscopic and spectroscopic methods are employed to probe the mobility and physical entrapment of dye molecules in dry and solvent-loaded poly(dimethylsiloxane) (PDMS) films. PDMS films of approximately 220 nm thickness are prepared by spin casting dilute solutions of Sylgard 184 onto glass coverslips, followed by low temperature curing. A perylene diimide dye (BPPDI) is used to probe diffusion and molecule-matrix interactions. TWO CLASSES OF DYE-LOADED SAMPLES ARE INVESTIGATED: (i) those incorporating dye dispersed throughout the films ("in film" samples) and (ii) those in which the dye is restricted primarily to the PDMS surface ("on film" samples). Experiments are performed under dry nitrogen and at various levels of isopropyl alcohol (IPA) loading from the vapor phase. A PDMS-coated quartz-crystal microbalance is employed to monitor solvent loading and drying of the PDMS and to ensure equilibrium conditions are achieved. Single molecules are shown to be predominantly immobile under dry conditions and mostly mobile under IPA-saturated conditions. Quantitative methods for counting the fluorescent spots produced by immobile single molecules in optical images of the samples demonstrate that the population of mobile molecules increases nonlinearly with IPA loading. Even under IPA saturated conditions, the population of fixed molecules is found to be greater than zero and is greatest for "in film" samples. Fluorescence correlation spectroscopy is used to measure the apparent diffusion coefficient for the mobile molecules, yielding a mean value of D = 1.4(+/-0.4) x 10(-8) cm(2)/s that is virtually independent of IPA loading and sample class. It is concluded that a nonzero population of dye molecules is physically entrapped within the PDMS matrix under all conditions. The increase in the population of mobile molecules under high IPA conditions is attributed to the filling of film micropores with solvent, rather than by incorporation of molecularly dispersed solvent into the PDMS.
Publication: Anal. Chem. 2008 Dec 15 ;80(24)::9726-34. :doi: 10.1021/ac8017179.
Publication Date: 2008 Dec 15
Study Author(s): Lange, Jeffrey J;Culbertson, Christopher T;Higgins, Daniel A;
Institution: Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA.
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Single molecule microscopic and spectroscopic methods are employed to probe the mobility and physical entrapment of dye molecules in dry and solvent-loaded poly(dimethylsiloxane) (PDMS) films. PDMS films of approximately 220 nm thickness are prepared by spin casting dilute solutions of Sylgard 184 onto glass coverslips, followed by low temperature curing. A perylene diimide dye (BPPDI) is used to probe diffusion and molecule-matrix interactions. TWO CLASSES OF DYE-LOADED SAMPLES ARE INVESTIGATED: (i) those incorporating dye dispersed throughout the films ("in film" samples) and (ii) those in which the dye is restricted primarily to the PDMS surface ("on film" samples). Experiments are performed under dry nitrogen and at various levels of isopropyl alcohol (IPA) loading from the vapor phase. A PDMS-coated quartz-crystal microbalance is employed to monitor solvent loading and drying of the PDMS and to ensure equilibrium conditions are achieved. Single molecules are shown to be predominantly immobile under dry conditions and mostly mobile under IPA-saturated conditions. Quantitative methods for counting the fluorescent spots produced by immobile single molecules in optical images of the samples demonstrate that the population of mobile molecules increases nonlinearly with IPA loading. Even under IPA saturated conditions, the population of fixed molecules is found to be greater than zero and is greatest for "in film" samples. Fluorescence correlation spectroscopy is used to measure the apparent diffusion coefficient for the mobile molecules, yielding a mean value of D = 1.4(+/-0.4) x 10(-8) cm(2)/s that is virtually independent of IPA loading and sample class. It is concluded that a nonzero population of dye molecules is physically entrapped within the PDMS matrix under all conditions. The increase in the population of mobile molecules under high IPA conditions is attributed to the filling of film micropores with solvent, rather than by incorporation of molecularly dispersed solvent into the PDMS.
PMID: 19006339