| Sample name | Si-O-C Bonding (nm) | (νas:Si-O)
(nm) | (νs: Si-O)
(nm) | Si-OH Bonding (nm) | O-H stretching (nm) | scissor bending (nm) |
| S1 (pH 3) | 1145 | 1087 | 786 | 964 | 3606, 3691 | Not detected |
| S2 (pH 5) | 1164 | 1068 | 790 | 964 | 3494, 3610 | Not detected |
| S3 (pH 8) | Not detected | 1107 | 794 | 948 | 3533 | 1627 |
| S4 (pH 10) | Not detected | 1107 | 790 | 925 | 3610 | 1631 |
| S5 (pH 12) | Not detected | 1087 | 790 | Not detected | 3637 | Not detected |