shows FTIR spectra of the four different types of modified Na-MMTs or organoclays
(i.e., DO-12C, TET-14C,
HEX-16C and OC-18C), compared with the unmodified clay
(i.e., Na-MMT). All of the clay types show absorption peaks
of the montmorillonite structure at wavenumbers
3637 cm1 (O-H stretching of structural hydroxyl groups),
1039 cm1 (Si-O stretching), 522 cm1 (Al-O stretching),
and 461 cm1 (Si-O bending)