Abstract
The surface morphology and frictional property of self-assembled domains of ultrathin organic films adsorbed on a solid substrate have been studied by a commercially available scanning probe microscopy with an operation mode of simultaneous atomic force microscopy and lateral force microscopy measurements. Two lipid film systems have been studied; one is a film system formed from synthetic dialkyl lipid, N, N-dioctadecylsuccinamic acid, and the other is films formed from biological phospholipids such as dipalmitoylphosphatidylcholine (DPPC), phosphatidylcholine, and phosphatidylethanolamine. The characteristic self-assembled domain structures as well as the local friction behaviors of the lipid films are presented. A preliminary result is also shown which suggests the hydrophobic alkyl tail groups appeared on multilamellar surfaces of DPPC film can be distinguished from the other hydrophilic polar headgroups.
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