Sol-gel Preparation of Hydrophobic Silica Coating-materials with Ultralow Refractive Index†

doi:10.7503/cjcu20170148

Abstract

Abstract:

Using methyltriethoxysilane(MTES), tetraethylorthosilicate(TEOS) as co-precursors and hydroxypropyl-β-cyclodextrin(HPCD) as porogen, ultralow refractive index films were prepared based on a base-catalysed sol-gel process. After further modification by hexamethylisilazane(HMDS), the lowest refractive index of these silica coatings obtained from the hybrid sol were 1.05 and the static water contact angles of the coatings increased from 66.4° to 128.7°. The data showed that the films prepared with HPCD as porogen got a pore diameter around 4 nm. Compared with those templates such as poloxamer(F127), HPCD not only perform well in decreasing the refractive index of films, but also eliminate light scattering caused by mesopore of the film, will have potential value in the field of surfactant-templated methods.

Key words: Ultralow refractive index, Sol-gel method, Hydrophobic, Hydroxypropyl-β, -cyclodextrin

CLC Number:

O631

TrendMD:

HE Meiying, LUO Jianhui, YANG Bowen, XIA Bibo, LI Yuanyang, ZHANG Shuming, JIANG Bo. Sol-gel Preparation of Hydrophobic Silica Coating-materials with Ultralow Refractive Index^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 2077.

Figures/Tables 5

Table 1 Optical parameters of porogen HPCD and F127 with varing contents

Γ	HPCD		F127
Γ	Refractive index, n	T_max(%)	Refractive index, n	T_max(%)
0.10	1.101	97.47	1.098	97.18
0.15	1.080	96.54	1.094	96.98
0.20	1.056	95.28	1.092	96.52
0.30	1.046	94.58	1.103	97.22
0.50	1.058	95.40	1.116	97.99
0.75	1.063	95.67
1.00	1.075	96.29
1.50	1.085	96.81
2.00	1.096	97.30

Fig.1 Measured transmittance spectrum of coatings with m(HPCD)/m(SiO2)=0.3(a) and the simulated spectrum of coatings with n=1.05(b)Inset: the dispersion curve of the corresponding coatings.

Fig.2 TEM image of sol particles with m(HPCD)/m(SiO2)=0.3Inset: SEM image of cross-section.

Fig.3 Nitrogen adsorption isotherms(A) and pore size distributions(B) for calcined HPCD-SiO2 at 400 ℃ for 1 h(a) and the uncalcined one(b)

Fig.4 Model of particles of HPCD-SiO2 sol before(A) and after(B) modification with HMDS and corresponding static contact angle images

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