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Issue 32, 2008
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Interfacial water structure at polymer gel/quartz interfaces investigated by sum frequency generation spectroscopy

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Abstract

Interfacial structures of water at polyvinyl alcohol (PVA) and poly(2-acrylamido-2-methypropane) sulfonic acid sodium salt (PNaAMPS)/quartz interfaces were investigated by sum frequency generation (SFG) spectroscopy. Two broad peaks were observed in OH stretching region at 3200 and 3400 cm−1, corresponding to the symmetric OH stretching of tetrahedrally coordinated, i.e., strongly hydrogen bonded “ice-like” water, and the asymmetric OH stretching of water in a more random arrangement, i.e., weakly hydrogen bonded “liquid-like” water, respectively, in both cases. The “liquid-like” water became dominant when the PVA gel was pressed against the quartz surface. The relative intensity of the SFG signal due to the “liquid-like” water to that due to the “ice-like water” at the quartz surface modified with a self-assembled monolayer of aminopropyltrimethoxysilane (APS) became higher when the negatively charged PNaMPS gel was contacted to the APS modified quartz surface in a solution of pH = 12, where the surface was negatively charged and electrostatic repulsive interaction and low friction were present between the PNaMPS gel and the APS modified surface. It, however, did not change in a solution of pH = 2, where the surface was positively charged and electrostatic attractive interaction and very high friction were present between the PNaMPS gel and the APS modified surface. These results suggest the important role of water structure for small friction at the polymer gel/solid interface.

Graphical abstract: Interfacial water structure at polymer gel/quartz interfaces investigated by sum frequency generation spectroscopy

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Publication details

The article was received on 27 Apr 2008, accepted on 10 Jul 2008 and first published on 17 Jul 2008


Article type: Paper
DOI: 10.1039/B807297N
Citation: Phys. Chem. Chem. Phys., 2008,10, 4987-4993

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    Interfacial water structure at polymer gel/quartz interfaces investigated by sum frequency generation spectroscopy

    H. Noguchi, M. Hiroshi, T. Tominaga, J. Ping Gong, Y. Osada and K. Uosaki, Phys. Chem. Chem. Phys., 2008, 10, 4987
    DOI: 10.1039/B807297N

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