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Interfacial Modification of Silica Surfaces Through -Isocanatopropyl Triethoxy Silane--Amine Coupling Reactions



Brandon M. Vogel, Dean DeLongchamp, Christine M. Mahoney, Leah A. Lucas, Daniel A. Fischer, Eric K. Lin


The surface reaction of gamma-isocyanatopropyl triethoxy silane coupling agent and octadecyl amine was investigated water contact goniometry, near edge x-ray absorption fine structure spectroscopy and time of flight secondary ion mass spectrometry. The graft-from surface reaction does not to proceed under a wide variety of seemingly favorable conditions. The choice of silane deposition solvent controlled the surface coverage but did not affect the integrity of isocyanate on the surface after deposition. When an amine was reacted with the isocyanatopropyl triethoxy silane before deposition, surfaces containing the desired functionality could be prepared. The lack of graft-from surface reaction was caused by steric hindrance and random orientation of the isocyanate. These results emphasize the importance of adding steric design criteria to new surface modification strategies, if a high density of functional group presentation is desired.


fine structure spectroscopy, isocyanate, near edge x-ray absorption, silane, spectrometry, surface modification, time of flight secondary ion mass


Vogel, B. , DeLongchamp, D. , Mahoney, C. , Lucas, L. , Fischer, D. and Lin, E. (2008), Interfacial Modification of Silica Surfaces Through -Isocanatopropyl Triethoxy Silane--Amine Coupling Reactions, Langmuir (Accessed April 22, 2024)
Created October 16, 2008