char = S;code = 83
char = t;code = 116
char = r;code = 114
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = l;code = 108
char = s;code = 115
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 = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = d;code = 100
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 = 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 = 46
result sql = Structural characteristics of silica sonogels prepared with additions of isopropyl alcohol.
Structural characteristics of silica sonogels prepared with additions of isopropyl alcohol.
char = W;code = 87
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = l;code = 108
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 = 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 = 1;code = 49
char = .;code = 46
char = 4;code = 52
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 = 3;code = 51
char = );code = 41
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = S;code = 83
char = i;code = 105
char = O;code = 79
char = 2;code = 50
char = /;code = 47
char = c;code = 99
char = m;code = 109
char = 3;code = 51
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
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 = 9;code = 57
char = 2;code = 50
char = ;code = 32
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = %;code = 37
char = ;code = 32
char = l;code = 108
char = i;code = 105
char = q;code = 113
char = u;code = 117
char = i;code = 105
char = d;code = 100
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 = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = y;code = 121
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = s;code = 115
char = i;code = 105
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = T;code = 84
char = E;code = 69
char = O;code = 79
char = S;code = 83
char = );code = 41
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = d;code = 100
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 = 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 = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = I;code = 73
char = P;code = 80
char = A;code = 65
char = /;code = 47
char = T;code = 84
char = E;code = 69
char = O;code = 79
char = S;code = 83
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = ;code = 32
char = R;code = 82
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = 0;code = 48
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 4;code = 52
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
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 = u;code = 117
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = r;code = 114
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = C;code = 67
char = O;code = 79
char = 2;code = 50
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = t;code = 116
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 = .;code = 46
char = ;code = 32
char = T;code = 84
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 = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = z;code = 122
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 = m;code = 109
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = -;code = 45
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = X;code = 88
char = -;code = 45
char = r;code = 114
char = a;code = 97
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = (;code = 40
char = S;code = 83
char = A;code = 65
char = X;code = 88
char = S;code = 83
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
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 = d;code = 100
char = s;code = 115
char = o;code = 111
char = r;code = 114
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
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 = 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 = D;code = 68
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 = .;code = 46
char = 1;code = 49
char = 0;code = 48
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = D;code = 68
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 = .;code = 46
char = 2;code = 50
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = g;code = 103
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = x;code = 120
char = i;code = 105
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
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 = 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 = 9;code = 57
char = .;code = 46
char = 5;code = 53
char = ;code = 32
char = t;code = 116
char = o;code = 111
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 = 6;code = 54
char = .;code = 46
char = 9;code = 57
char = ;code = 32
char = n;code = 110
char = m;code = 109
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = R;code = 82
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 = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = 0;code = 48
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 4;code = 52
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = g;code = 103
char = t;code = 116
char = h;code = 104
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 = p;code = 112
char = r;code = 114
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
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 = 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 = 0;code = 48
char = .;code = 46
char = 3;code = 51
char = ;code = 32
char = n;code = 110
char = m;code = 109
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = r;code = 114
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = s;code = 115
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 = l;code = 108
char = y;code = 121
char = ;code = 32
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = f;code = 102
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 = ;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 = 112
char = o;code = 111
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result sql = Wet silica gels with approximately 1.4 x 10(-3) mol SiO2/cm3 and approximately 92 vol % liquid phase were obtained from sonohydrolysis of tetraethoxysilane (TEOS) with different additions of isopropyl alcohol (IPA). The IPA/TEOS molar ratio R was changed from 0 to 4. Aerogels were obtained by supercritical CO2 extraction. The samples were analyzed by small-angle X-ray scattering (SAXS) and nitrogen adsorption. The wet gels exhibit mass fractal structure with fractal dimension increasing from D approximately 2.10 to D approximately 2.22, characteristic length xi decreasing from approximately 9.5 to approximately 6.9 nm, as R increases from 0 to 4, and an estimated characteristic length for the primary silica particles lower than approximately 0.3 nm. The supercritical process apparently eliminates a fraction of the porosity, increasing the mass fractal dimension and shortening the fractality domain in the mesopore region. The fundamental role of isopropyl alcohol on the structure of the resulting aerogels is to decrease the porosity and the pore mean size as R changes from pure TEOS to R = 4. A secondary structure appearing in the micropore region of the aerogels can be described as a mass/surface fractal structure, with correlated mass fractal dimension Dm approximately 2.7 and surface fractal dimension Ds approximately 2.3, as inferred from SAXS and nitrogen adsorption data.

Publication: J Phys Chem B 2006 Nov 2 ;110(43)::21582-7.
Publication Date: 2006 Nov 2
Study Author(s): Donatti, D A;Ibañez Ruiz, A;Kumakawa, M M;Vollet, D R;
Institution: UNESP-Universidade Estadual Paulista, IGCE, Departamento de Física, Cx P 178, 13500-970 Rio Claro (SP), Brazil.
Shortcut link to this study:
Wet silica gels with approximately 1.4 x 10(-3) mol SiO2/cm3 and approximately 92 vol % liquid phase were obtained from sonohydrolysis of tetraethoxysilane (TEOS) with different additions of isopropyl alcohol (IPA). The IPA/TEOS molar ratio R was changed from 0 to 4. Aerogels were obtained by supercritical CO2 extraction. The samples were analyzed by small-angle X-ray scattering (SAXS) and nitrogen adsorption. The wet gels exhibit mass fractal structure with fractal dimension increasing from D approximately 2.10 to D approximately 2.22, characteristic length xi decreasing from approximately 9.5 to approximately 6.9 nm, as R increases from 0 to 4, and an estimated characteristic length for the primary silica particles lower than approximately 0.3 nm. The supercritical process apparently eliminates a fraction of the porosity, increasing the mass fractal dimension and shortening the fractality domain in the mesopore region. The fundamental role of isopropyl alcohol on the structure of the resulting aerogels is to decrease the porosity and the pore mean size as R changes from pure TEOS to R = 4. A secondary structure appearing in the micropore region of the aerogels can be described as a mass/surface fractal structure, with correlated mass fractal dimension Dm approximately 2.7 and surface fractal dimension Ds approximately 2.3, as inferred from SAXS and nitrogen adsorption data.
PMID: 17064111

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