Controlling the hydrophobicity of submicrometer silica spheres viasurface modification for nanocomposite applications

ISL OpenIR > 青海盐湖研究所知识仓储

	Controlling the hydrophobicity of submicrometer silica spheres viasurface modification for nanocomposite applications
	Wu, Zhijian; Han, Hyuk; Han, Woojoo; Kim, Bumsang; Ahn, Kyung Hyun; Lee, Kangtaek
	2007
发表期刊	LANGMUIR
ISSN	0743-7463
卷号	23 期号:14 页码:7799-7803
摘要	We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2)(2)CH3,-CH2(CH2)(4)CH2-,-C6H5,-(CH2)(7)CH3, and -(CH2)(11)CH3 groups through a modified one-step process. The scanning electron microscopy ( SEM), quasi-elastic light scattering (QELS), UV-visible spectra, nitrogen sorption, and water vapor adsorption methods are used to characterize the particles. The SEM micrographs of the particles demonstrate that the modified particles are uniformly spherical, monodisperse, and well-shaped with the particle size ranging from 130 to 149 nm depending on the modified organic groups. In aqueous solution, the particles modified with phenyl groups have an obvious UV absorption peak at around 210 nm, whereas the other modified particles and unmodified particles do not have any UV-visible absorption peaks. There exist obvious differences in the amount of water vapor adsorbed depending on the type of surface functional groups of the modified particles. Compared with the unmodified particles, the modified particles have a lower water vapor adsorption because of the improved hydrophobicity of the particle surface. As a potential application, we prepared polystyrene/SiO2 nanocomposites by blending polystyrene with the synthesized particles. Water contact angle measurements show that the surface of the composite prepared with the modified particles are more hydrophobic. Confocal microcopy demonstrates that the particles are less agglomerated in the nanocomposite as the particles become more hydrophobic. These comprehensive experimental results demonstrate that the hydrophobicity of the particles can be easily controlled by surface modification with different organosilanes through a modified one-step process. We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2)(2)CH3,-CH2(CH2)(4)CH2-,-C6H5,-(CH2)(7)CH3, and -(CH2)(11)CH3 groups through a modified one-step process. The scanning electron microscopy ( SEM), quasi-elastic light scattering (QELS), UV-visible spectra, nitrogen sorption, and water vapor adsorption methods are used to characterize the particles. The SEM micrographs of the particles demonstrate that the modified particles are uniformly spherical, monodisperse, and well-shaped with the particle size ranging from 130 to 149 nm depending on the modified organic groups. In aqueous solution, the particles modified with phenyl groups have an obvious UV absorption peak at around 210 nm, whereas the other modified particles and unmodified particles do not have any UV-visible absorption peaks. There exist obvious differences in the amount of water vapor adsorbed depending on the type of surface functional groups of the modified particles. Compared with the unmodified particles, the modified particles have a lower water vapor adsorption because of the improved hydrophobicity of the particle surface. As a potential application, we prepared polystyrene/SiO2 nanocomposites by blending polystyrene with the synthesized particles. Water contact angle measurements show that the surface of the composite prepared with the modified particles are more hydrophobic. Confocal microcopy demonstrates that the particles are less agglomerated in the nanocomposite as the particles become more hydrophobic. These comprehensive experimental results demonstrate that the hydrophobicity of the particles can be easily controlled by surface modification with different organosilanes through a modified one-step process.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2284
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Wu, Zhijian,Han, Hyuk,Han, Woojoo,et al. Controlling the hydrophobicity of submicrometer silica spheres viasurface modification for nanocomposite applications[J]. LANGMUIR,2007,23(14):7799-7803.
APA	Wu, Zhijian,Han, Hyuk,Han, Woojoo,Kim, Bumsang,Ahn, Kyung Hyun,&Lee, Kangtaek.(2007).Controlling the hydrophobicity of submicrometer silica spheres viasurface modification for nanocomposite applications.LANGMUIR,23(14),7799-7803.
MLA	Wu, Zhijian,et al."Controlling the hydrophobicity of submicrometer silica spheres viasurface modification for nanocomposite applications".LANGMUIR 23.14(2007):7799-7803.