Controlling the hydrophobicity of submicrometer silica spheres via surface modification for nanocomposite applications

Zhijian Wu, Hyuk Han, Woojoo Han, Bumsang Kim, Kyung Hyun Ahn, Kangtaek Lee

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2) 2CH3, -CH2(CH2)4CH 2-, -C6H5, -(CH2)7CH 3, and -(CH2)11CH3 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.

Original languageEnglish
Pages (from-to)7799-7803
Number of pages5
JournalLangmuir
Volume23
Issue number14
DOIs
Publication statusPublished - 2007 Jul 3

Fingerprint

Hydrophobicity
hydrophobicity
Silicon Dioxide
Surface treatment
Nanocomposites
nanocomposites
Steam
Silica
Water vapor
silicon dioxide
Polystyrenes
Adsorption
Scanning electron microscopy
Elastic scattering
Angle measurement
Light scattering
Functional groups
Contact angle
Sorption
Nitrogen

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Wu, Zhijian ; Han, Hyuk ; Han, Woojoo ; Kim, Bumsang ; Ahn, Kyung Hyun ; Lee, Kangtaek. / Controlling the hydrophobicity of submicrometer silica spheres via surface modification for nanocomposite applications. In: Langmuir. 2007 ; Vol. 23, No. 14. pp. 7799-7803.
@article{21fe2907536f450f95139b8e9b7b6b51,
title = "Controlling the hydrophobicity of submicrometer silica spheres via surface modification for nanocomposite applications",
abstract = "We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2) 2CH3, -CH2(CH2)4CH 2-, -C6H5, -(CH2)7CH 3, and -(CH2)11CH3 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.",
author = "Zhijian Wu and Hyuk Han and Woojoo Han and Bumsang Kim and Ahn, {Kyung Hyun} and Kangtaek Lee",
year = "2007",
month = "7",
day = "3",
doi = "10.1021/la700386z",
language = "English",
volume = "23",
pages = "7799--7803",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "14",

}

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.

In: Langmuir, Vol. 23, No. 14, 03.07.2007, p. 7799-7803.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Controlling the hydrophobicity of submicrometer silica spheres via surface modification for nanocomposite applications

AU - Wu, Zhijian

AU - Han, Hyuk

AU - Han, Woojoo

AU - Kim, Bumsang

AU - Ahn, Kyung Hyun

AU - Lee, Kangtaek

PY - 2007/7/3

Y1 - 2007/7/3

N2 - We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2) 2CH3, -CH2(CH2)4CH 2-, -C6H5, -(CH2)7CH 3, and -(CH2)11CH3 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.

AB - We control the hydrophobicity of submicrometer silica spheres by modifying their surface with -CH3, -CH=CH2, -(CH2) 2CH3, -CH2(CH2)4CH 2-, -C6H5, -(CH2)7CH 3, and -(CH2)11CH3 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.

UR - http://www.scopus.com/inward/record.url?scp=34547162963&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547162963&partnerID=8YFLogxK

U2 - 10.1021/la700386z

DO - 10.1021/la700386z

M3 - Article

C2 - 17559243

AN - SCOPUS:34547162963

VL - 23

SP - 7799

EP - 7803

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 14

ER -