H. Yamaoka et al., X-RAY REFLECTIVITY STUDY OF FINE-STRUCTURE OF THIN POLYMER-FILMS AND POLYMER ASSEMBLY AT INTERFACE, Physica. B, Condensed matter, 248, 1998, pp. 280-283
For the purpose of studying the surfaces of both thin films and monola
yers on water surface, an apparatus for X-ray reflectometry (XR) has b
een newly constructed by modification of a theta-theta goniometer. At
the sample position, the specially designed LB trough was set for wate
r surface measurements. In the case of a thin poly(vinyl alcohol) film
on a glass plate prepared by the spin-coating method, a lot of sharp
and clear Kiessig fringes (at least 34th) are observed, indicating an
extremely high resolution of our XR apparatus. Similar experiments wer
e also performed for thin multilayer films composed of different kinds
of polymers, and the fine structures of these films were precisely de
termined. XR profiles of distearoylphosphatidylcholine (DSPC), a phosp
holipid, monolayer on water surface were measured at three different s
urface pressures. The fringe positions shifted towards the lower angle
direction with increasing surface pressure, indicating that the monol
ayer thickness increases with the increase of surface pressure. (C) 19
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