G Ketteler et al 2008 J. Phys.: Condens. Matter 20 184024 doi:10.1088/0953-8984/20/18/184024
G Ketteler1, P Ashby2, B S Mun3,4, I Ratera5, H Bluhm6, B Kasemo1 and M Salmeron2,5
Show affiliationsUsing in situ photoelectron spectroscopy at near ambient conditions, we compare the interaction of water with four different model biomaterial surfaces: self-assembled thiol monolayers on Au(111) that are functionalized with methyl, hydroxyl, and carboxyl groups, and phosphatidylcholine (POPC) lipid films on silicon. We show that the interaction of water with biomaterial surfaces is mediated by polar functional groups that interact strongly with water molecules through hydrogen bonding, resulting in adsorption of 0.2–0.3 ML water on the polar thiol films in 700 mTorr water pressure and resulting in characteristic N 1s and P 2p shifts for the POPC films. Provided that beam damage is carefully controlled, in situ electron spectroscopy can give valuable information about water adsorption which is not accessible under ultrahigh vacuum conditions.
82.30.Rs Hydrogen bonding, hydrophilic effects
Issue 18 (7 May 2008)
Received 10 July 2007, in final form 13 September 2007
Published 17 April 2008
G Ketteler et al 2008 J. Phys.: Condens. Matter 20 184024
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