Abstract
Langmuir films of poly( gamma -benzyl-L-glutamate) (molecular weight=28000) at a variety of surface pressures both below and above the monolayer-bilayer transition have been deposited onto infrared-transparent chalcogenide glass discs using a horizontal touching method. Polarised infrared spectra were obtained on the resultant films (about 60 monolayers thick) and the dichroic ratios of the four strongest absorptions (3292, 1733, 1655 and 1549 cm-1) were measured. At very low pressures (2.5 mN m-1) the alpha -helices in the monolayer are randomly orientated. At moderate pressures (5-10 mN m-1) where the film is a monolayer, the helices are oriented predominantly perpendicularly to the compressing barrier, but in a collapsed bilayer (25 mN m-1) they are predominantly parallel to the barrier. The results, which are not confused by the direction of withdrawal as in conventional Langmuir-Blodgett deposition, demonstrate clearly an interesting reorientation effect in these films.
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