# Langmuir Films of Normal-Alkanes on the Surface of Liquid Mercury

 Title: Langmuir Films of Normal-Alkanes on the Surface of Liquid Mercury Author: Kraack, H.; Ocko, B. M.; Pershan, Peter S.; Sloutskin, E.; Deutsch, M. Note: Order does not necessarily reflect citation order of authors. Citation: Kraack, H., B. M. Ocko, Peter S. Pershan, E. Sloutskin, and M. Deutsch. 2003. Langmuir films of normal-alkanes on the surface of liquid mercury. Journal of Chemical Physics 119(19): 10339-10349. Full Text & Related Files: Kraack_Langmuir.pdf (191.9Kb; PDF) Abstract: The coverage dependent phase behavior of molecular films of n-alkanes ($$CH_{3}CH_{n−2}CH_3$$, denote Cn) on mercury was studied for lengths 10 $$\leq$$ n $$\leq$$ 50, using surface tensiometry and surface x-ray diffraction methods. In contrast with Langmuir films on water, where roughly surface-normal molecular orientation is invariably found, alkanes on mercury are always oriented surface-parallel, and show no long-range in-plane order at any surface pressure. At a low coverage a two-dimensional gas phase is found, followed, upon increasing the coverage, by a single condensed layer (n $$\leq$$ 18), a sequence of single and double layers (19 $$\leq$$ n $$\leq$$ 20; n $$\geq$$ 26), or a sequence of single, double, and triple layers (22 $$\leq$$ n $$\leq$$ 24). The thermodynamical and structural properties of these layers, as determined from the measurements, are discussed. Published Version: doi:10.1063/1.1618211 Other Sources: http://www.liquids.deas.harvard.edu/peter/2003.pdf/jcp10339.pdf Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10354436 Downloads of this work: