Octadecylsilane-modified silicas in the adsorption of toluene

A series of octadecylsilane-modified silicas were prepared by sol-gel and grafting methods. Carbon contents and octadecyl chain conformations were shown to depend on the preparative route. Grafting engenders a low carbon content and a liquid-like chain conformation, while the sol-gel method affords...

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Published inAnalytical and bioanalytical chemistry Vol. 391; no. 7; pp. 2673 - 2681
Main Authors Brambilla, Rodrigo, Pinto, Carolina F, Miranda, Márcia S. L, dos Santos, João H. Z
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Berlin/Heidelberg : Springer-Verlag 01.08.2008
Springer-Verlag
Subjects
adsorption
Analytical Chemistry
Biochemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Diffuse reflectance spectroscopy
Food Science
Hybrid silicas
Laboratory Medicine
Monitoring/Environmental Analysis
Octadecylsilsane
Original Paper
Hybrid silicas
Diffuse reflectance spectroscopy
Adsorption
Octadecylsilsane
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Summary:A series of octadecylsilane-modified silicas were prepared by sol-gel and grafting methods. Carbon contents and octadecyl chain conformations were shown to depend on the preparative route. Grafting engenders a low carbon content and a liquid-like chain conformation, while the sol-gel method affords a much higher carbon content and a crystalline conformation. The relationships between the toluene adsorption of the hybrid silicas and their chain conformations, their carbon contents and their textural characteristics are discussed. These sorbents, when used in combination with ultraviolet diffuse reflectance spectroscopy (UV DRS), can be employed as a rapid screening method for detection of aromatic compounds in water and air environmental matrices. [graphic removed]
Bibliography:http://dx.doi.org/10.1007/s00216-008-2158-x
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ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-008-2158-x