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M. P. Bondarenko, V. I. Kovalchuk, Yu. B. Borkovska, E. K. Zholkovskiy, D. Vollhardt
«Concentration Polarization During Langmuir–Blodgett Films’ Deposition»
PACS numbers: 68.05.-n, 68.08.-p, 68.15.+e, 68.18.Fg, 68.35.Np, 68.47.Pe, 68.65.Ac
New functional interfaces with controlled heterogeneity having a lateral resolution in the nanometre range are of great importance for many promising applications. One of the easiest ways to produce such patterned interfaces is the deposition of insoluble amphiphilic monolayers on the substrate surface, according to the well-known approach developed by Langmuir and Blodgett. Under some specific conditions, deposited monolayers can form not homogeneous layers, but well-controlled structured films. Such structured films are a result of monolayer interaction with the substrate surface and instabilities developed within the receding menisci. In particular, regular stripe patterns can be obtained by deposition of charged fatty acid monolayers, which are formed due to contact line auto-oscillations during the deposition process. In the previous studies, symmetrical systems were considered, where the monolayer is deposited onto substrate surface already covered by the previously deposited similar monolayer. In this article, we consider asymmetrical configurations, where the monolayer is deposited onto a bare substrate surface. As shown, the similar mechanism of structure formation is realized also in this case, but for significantly larger deposition rates.
Keywords: Langmuir–Blodgett films, charged amphiphilic monolayers, nanostructured coatings, concentration polarization, patterned films, meniscus instability, lateral resolution
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