Abstract
Surface structures of trichloro(octadecyl)silane (TCOS) monolayers and mixed monolayers of TCOS and a partially fluorinated silazane derivative (FS) were studied with Brewster angle microscopy, topographic and friction force AFM and FT-IR. When TCOS monolayers are spread from a spreading solution, condensed phase domains of as small as 1–3 μm in diameter (called “micro-domains”) are formed, surrounded by a gaseous phase. They gather to form very large, irregular-shaped macroscopic islands which are larger than a few hundred micrometers in size. For the TCOS/FS mixed monolayers, surfaces composed of micro-domains of hydrocarbon phase surrounded by continuous fluorocarbon phase are observed. The surface morphology of the mixed monolayers varies with changing molar fractions of the components. The cause and mechanism for the formation of the micro-phase separated surface morphology are considered in terms of both the line tension at the two-phase boundary and the dynamics of the spreading processes.
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