PLANAR BILAYERS OF LANGMUIR-BLODGETT-FILMS FROM 16-8 DIACETYLENE

A method to form large, planar bilayers of 16-8 diacetylene at the air/water interface and to transfer these bilayers to aluminized glass substrates using the Langmuir-Blodgett technique has been demonstrated Support for bilayer formation and deposition includes Langmuir trough data, ellipsometry of monolayers and bilayers following deposition onto aluminized glass slides, and FT-IR analyses of the deposited Langmuir trough data show that a stable bilayer is formed at the air/water interface at a film pressure of 35 dyn/cm. The calculated molecular area after film formation suggests a bilayer ''sandwich'' comprising two tightly packed monolayers. In addition, the ellipsometry of transferred bilayers shows them to be two monolayers in thickness. Finally, the quantitative transfer of up to four bilayers over aluminized slides was confirmed by FT-IR analysis; the spectra can be rationalized by head-to-head arrangement of the surface-active diacetylenic molecules in the bilayer assembly.