| Abstract
| - Mixed monolayers of octadecyltrimethoxisilane, OTMS, and poly(ethylene oxide), PEO, have been studiedat the air/water interface as a function of pH by means of surface pressure and surface potential isotherms.PEO had a strong influence on the isotherms at large monolayer areas, while it was squeezed out of theair/water interface at high surface pressures. The LE−LC transition pressure of unhydrolyzed OTMS wasincreased by several mN/m in the presence of PEO, while PEO had little influence on the isotherms ofhydrolyzed OTMS at small monolayer areas. The results are discussed in terms of attractive van der Waalsinteractions between methoxy groups of nonhydrolyzed OTMS and PEO.
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