Direct Method for Surface Silyl Functionalization of Mesoporous Silica

Yi-Hsin Liu, Hong Ping Lin, Chung Yuan Mou

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

A direct method of surface silyl modification and simultaneous surfactant removal of mesoporous silica is investigated in its physicochemical details. Twelve different silanes of various functionalities are studied. The method employs an alcohol solution of silanes to allow the simultaneous surfactant/silyl exchange process, which results in a more uniform monolayer coverage of the surface and a higher amount of surface attachments of silane. We vary the solution concentration of silanes to study the effect on loadings. It is found that the variation of the surface loading of the silyl group follows a Langmuir adsorption model closely, The method gives one a well-controlled monolayer coverage of the surface. The loadings are determined by the exchange equilibrium. Fittings of the loading data to Langmuir adsorption isotherms give one the adsorption equilibrium constants and maximum surface loadings. We categorize the silanes into three different groups according to the values of the equilibrium constants and discuss them with respect to molecular structures. We also report on the extensive characterizations of the surface-functionalized mesoporous materials, such as nitrogen adsorptions, X-ray diffraction, 29Si magic-angle spinning NMR, 13C magic-angle spinning NMR, and IR spectroscopy. The method provides one with a convenient and highly controllable approach to the surface functionalization of mesoporous silica.

Original languageEnglish
Pages (from-to)3231-3239
Number of pages9
JournalLangmuir
Volume20
Issue number8
Publication statusPublished - 2004 Apr 13

Fingerprint

Silanes
Silicon Dioxide
Silica
Adsorption
silicon dioxide
silanes
Surface-Active Agents
Magic angle spinning
Equilibrium constants
adsorption
Monolayers
metal spinning
Surface active agents
Molecular Structure
X-Ray Diffraction
surfactants
Mesoporous materials
Magnetic Resonance Spectroscopy
Nitrogen
nuclear magnetic resonance

ASJC Scopus subject areas

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

Cite this

Direct Method for Surface Silyl Functionalization of Mesoporous Silica. / Liu, Yi-Hsin; Lin, Hong Ping; Mou, Chung Yuan.

In: Langmuir, Vol. 20, No. 8, 13.04.2004, p. 3231-3239.

Research output: Contribution to journalArticle

Liu, Y-H, Lin, HP & Mou, CY 2004, 'Direct Method for Surface Silyl Functionalization of Mesoporous Silica', Langmuir, vol. 20, no. 8, pp. 3231-3239.
Liu, Yi-Hsin ; Lin, Hong Ping ; Mou, Chung Yuan. / Direct Method for Surface Silyl Functionalization of Mesoporous Silica. In: Langmuir. 2004 ; Vol. 20, No. 8. pp. 3231-3239.
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