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Controlling the hydrophobicity of submicrometer silica spheres via surface modification for nanocomposite applications
Wu, Zhijian; Han, Hyuk; Han, Woojoo; Kim, Bumsang; Ahn, Kyung Hyun; Lee, Kangtaek
2007-07-03
Source PublicationLANGMUIR
Volume23Issue:14Pages:7799-7803
SubtypeArticle
AbstractWe 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.
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS KeywordORGANIC-DYE ADSORPTION ; PARTICLE ARRAYS ; NANOPARTICLES ; MONODISPERSE ; ROUTE ; POLYMERIZATION ; FABRICATION ; CHEMISTRY ; GROWTH
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000247487200060
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Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5798
Collection青海盐湖研究所知识仓储
Affiliation1.Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 151742, South Korea
2.Yonsei Univ, Dept Chem Engn, Seoul 120749, South Korea
3.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
4.Hongik Univ, Dept Chem Engn, Seoul 121791, South Korea
Recommended Citation
GB/T 7714
Wu, Zhijian,Han, Hyuk,Han, Woojoo,et al. Controlling the hydrophobicity of submicrometer silica spheres via surface 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 via surface modification for nanocomposite applications.LANGMUIR,23(14),7799-7803.
MLA Wu, Zhijian,et al."Controlling the hydrophobicity of submicrometer silica spheres via surface modification for nanocomposite applications".LANGMUIR 23.14(2007):7799-7803.
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