Hydrophobic modification of γ-alumina membranes with organochlorosilanes

Sah, A. and Castricum, H.L and Bliek, A. and Blank, D.H.A. and Elshof ten, J.E. (2004) Hydrophobic modification of γ-alumina membranes with organochlorosilanes. Journal of Membrane Science, 243 (1-2). pp. 125-132. ISSN 0376-7388

PDF
Restricted to UT campus only: Request a copy
170Kb

Abstract:	Mesoporous γ-alumina membranes were chemically modified with several organochlorosilanes. XPS with depth profiling and permporometry experiments were used to study the local organosilane concentrations and their effect on the pore structure. It was found that the penetration of long chain chlorosilanes into the mesopores was sterically hindered and that grafting was not as effective as for short chain organosilanes. Membranes modified with monofunctional organosilanes showed a smaller Kelvin radius than unmodified γ-alumina membranes as observed by permporometry, indicating that methyl groups resided inside the pores. For membranes modified with di- and trifunctional organosilanes larger Kelvin radii were observed, indicating that polymerized silane networks block the smaller pores, thereby decreasing the overall permeability of the membrane. The permeability of hydrophilic and hydrophobic solvents was affected by the hydrophobic modification of the surface and the internal pore walls depending on the nature of the chlorosilane used for grafting.
Item Type:	Article
Copyright:	© 2004 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Materials Science (IMS)
Link to this item:	http://purl.utwente.nl/publications/47997
Official URL:	http://dx.doi.org/10.1016/j.memsci.2004.05.031
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Repository Staff Only: item control page

Metis ID: 219094