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231223s2007 xx ||||| 00| ||eng c |
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|a pubmed24n0569.xml
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|a (DE-627)NLM170795365
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|a (NLM)17559243
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Wu, Zhijian
|e verfasserin
|4 aut
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|a Controlling the hydrophobicity of submicrometer silica spheres via surface modification for nanocomposite applications
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 14.09.2007
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2)(2)CH3, -CH2(CH2)(4)CH2-, -C(6)H(5), -(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 microscopy 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
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|a Comparative Study
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Organosilicon Compounds
|2 NLM
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|a Water
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|a 059QF0KO0R
|2 NLM
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|a Silicon Dioxide
|2 NLM
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|a 7631-86-9
|2 NLM
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| 700 |
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|a Han, Hyuk
|e verfasserin
|4 aut
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| 700 |
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|a Han, Woojoo
|e verfasserin
|4 aut
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| 700 |
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|a Kim, Bumsang
|e verfasserin
|4 aut
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| 700 |
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|a Ahn, Kyung Hyun
|e verfasserin
|4 aut
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| 700 |
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|a Lee, Kangtaek
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 23(2007), 14 vom: 03. Juli, Seite 7799-803
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:23
|g year:2007
|g number:14
|g day:03
|g month:07
|g pages:7799-803
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|d 23
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|h 7799-803
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