Figure 1
Surface modification characterizations and morphology. (A) FT-IR spectra of pristine halloysite (red), PPA-modified halloysite (PPA-halloysite, black), and Janus nanoplate, the asymmetrically modified halloysite (PPA-halloysite-PDMAEMA, blue). After alumina side modification, benzyl characteristic peak (1438 cm−1, ring deformation) is observed on the PPA-halloysite spectrum after alumina-side PPA modification. PDMAEMA characteristic peak (1728 cm−1, carbonyl stretching) is observed after silica-side ATRP modification; (B) 27Al MAS ssNMR spectra of pristine halloysite (blue), Janus nanoplate (PPA-halloysite-PDMAEMA, red) @ 5 kHz. Janus nanoplate (PPA-halloysite-PDMAEMA, red) @ 4.2 kHz; transmission electron microscopic images: (C) raw halloysite; (D) PPA unfolded halloysite nanoplate; (E) PPA-halloysite-poly(DMAEMA) nanoplate surfactant.
