We have built a Langmuir-Blodgett (LB) deposition trough that mounts onto a Huber 4-circle diffractometer, so that the LB substrate and the water are in the same closed, temperature-controlled environment. We have used this system to study Langmuir-Blodgett films just after transfer using synchrotron X-ray diffraction. We were able to deposit from the L2, L2′, S, and RII phases of a fatty acid monolayer, and observe the same structures in the transferred monolayers. Three of these phases have not been observed before on a glass substrate. Once deposited, the LB monolayer structure was not affected either by pressure changes in the water monolayer (when part of the substrate was still immersed) or by the substrate remaining in contact with the water or not. The structures were stable over time but changed irreversibly under the effects of radiation damage and temperature cycling. These results show that the change from the structure observed on water to the final LB structure does not occur during deposition, but long afterward.
|Original language||English (US)|
|Number of pages||3|
|State||Published - Nov 26 1997|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces