The interface-sensitive spectroscopic method, sum frequency generation (SFG), has been used to investigate the interfacial water structure on a fused quartz surface modiÃed by an octadecyltrichlorosilane (OTS) self-assembled monolayer in phosphate bu †ered solutions at various pHs. The experimental results
demonstrate that the water molecules at the quartz / OTS surface Ñip while the water molecules at the OTS surface maintain their orientation when the solution pH is changed from neutral to acidic. The results show that most of the silanol groups still exist on the fused quartz surface even after a silane coupling reaction of OTS under the reported experimental conditions.
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