Synthesis of Amphiphilic Silica Nanoparticles with Double-sphere Morphology†

doi:10.7503/cjcu20170849

Abstract

Abstract:

Amphiphilic silica nanoparticles with double-sphere morphology were fabricated via the assembly of hydrophobic silica nanoparticles and hydrophilic nanoparticles through chemical interaction. Silica nanopartilces prepared by the sol-gel method were modified by hexamethyldisilazane(HMDS) and 3-glycidoxy-propyltrimethoxysilane(KH560) to obtain hydrophobic silica nanoparticles and hydrophilic silica nanoparticles respectively, which were then further linked together by the chemical bond on the surface of nanoparticles. The as-prepared amphiphilic silica nanoparticles with double-sphere morphology can stabilize the cyclohexane in water Pickering emulsion, indicating the good amphiphilic property of amphiphilic silica nanoparticles with double-sphere morphology.

Key words: Amphiphilic silica nanoparticles, Sol-gel method, Pickering emulsion

TrendMD:

LUO Jianhui,YANG Jie,LI Yuanyang,HE Lipeng,JIANG Bo. Synthesis of Amphiphilic Silica Nanoparticles with Double-sphere Morphology^†[J]. Chem. J. Chinese Universities, 2018, 39(10): 2170.

Figures/Tables 11

Fig.1 Particle size distribution curves of SiO2 nanoparticles(A), HMDS modified hydrophobic SiO2 nanoparticles(B), KH560 modified hydrophilic SiO2 nanoparticles(C) and amphiphilic SiO2 nanoparticles(D)

Fig.2 FTIR spectra of SiO2 nanoparticles(a), HMDS modified hydrophobic SiO2 nanoparticles(b) and KH560 modified hydrophilic SiO2 nanoparticles(c)

Fig.3 Solid-state 13C CPMAS NMR spectra of SiO2 nanoparticles(a), HMDS modified hydrophobic SiO2 nanoparticles(b), KH560 modified hydrophilic SiO2 nanoparticles(c) and amphiphilic SiO2 nanoparticles(d)

Fig.4 Water contact angle(A—D) and oil contact angle(E—H) of 25HMDS(A, E), 50HMDS(B, F),75HMDS(C, G) and 100HMDS(D, H)

Fig.5 Schematic illustration of hydrophilic modification of SiO2 nanoparticles by KH560

Fig.6 Water contact angles of 25KH560(A), 50KH560(B), 75KH560(C) and 100KH560(D)

Fig.7 Schematic illustration of the preparation process of amphiphilic silica nanoparticles with double-sphere morphology

Fig.8 XPS fine spectra of hydrophilic silica nanoparticles(A, B) and amphiphilic silica nanoparticles(C—E)(A, C) C1s; (B, D) O1s; (E) N1s.

Table 1 Particle size of amphiphilic silica nanoparticles with double-sphere morphology

Sample	Particle size/nm	Sample	Particle size/nm
25HMDS-NH₂-25KH560	25.98	75HMDS-NH₂-25KH560	26.47
25HMDS-NH₂-50KH560	31.48	75HMDS-NH₂-50KH560	26.99
25HMDS-NH₂-75KH560	29.55	75HMDS-NH₂-75KH560	29.81
25HMDS-NH₂-100KH560	31.49	75HMDS-NH₂-100KH560	33.48
50HMDS-NH₂-25KH560	23.76	100HMDS-NH₂-25KH560	25.80
50HMDS-NH₂-50KH560	29.51	100HMDS-NH₂-50KH560	28.66
50HMDS-NH₂-75KH560	27.43	100HMDS-NH₂-75KH560	31.75
50HMDS-NH₂-100KH560	30.31	100HMDS-NH₂-100KH560	28.22

Fig.9 Zeta potential of 75HMDS-NH2, 25KH560,75HMDS-NH2-25KH560

Fig.10 Photographs of cyclohexane-water emulsions stabilized by 75HMDS-NH2-25KH560(a),75HMDS(b), 25KH560(c) and 75HMDS-25KH560(d)

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