Table 2 Peak positions in the FT-IR spectra and their corresponding vibrational modes
From: Earthquake lubrication and healing explained by amorphous nanosilica
Vibrational mode | Position of peak (cm−1) | ||||
|---|---|---|---|---|---|
Nanosilica | Commercial nanosilica (this study) | Wear material (this study) | Powdered novaculite (this study) | α-quartz | |
Isolated (free) silanol66 | 3747 | 3745 | |||
H-bonded silanol66 | 3660 | 3650 | |||
Stretching of H2O66 | 3450 | 3348 | 3424 | ||
Asymmetric stretching of Si–O–Si20 | 1089 | 1066 | 1052 | 1087, 1043 | 1175, 1100 |
Bending of Si–OH67 | 972 | 1066 | |||
812 | 798 | 797, 780 (double peak) | 795, 776 (double peak) | 797, 778 (double peak) | |
Symmetric bending of Si–O–Si20 | 695 | 694 | 695 | ||
Asymmetric bending of O–Si–O20 | 474 | 539 (shoulder), 452 | 515 (shoulder), 447 | 510 (shoulder), 446 | 516 (shoulder), 470 |
