Surface crystallization in normal-alkanes and alcohols

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Description

A new, rare surface freezing, phenomenon is observed in molten normal-alkanes and their derivatives (alcohols, thiols, etc.). X-ray and surface tension measurements show the formation of a crystalline monolayer on the surface of the liquid alkane at temperatures up to 3 C above the bulk solidification temperature, T{sub f}. For alcohols, a single bilayer is formed. In both cases, the molecules in the layer are hexagonally packed and oriented normal to the surface for short chain lengths, and tilted for long ones. In both cases the single layer persists down to T{sub f}. In terms of wetting theory, this constitutes ... continued below

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9 p.

Creation Information

Deutsch, M.; Ocko, B.M.; Wu, X.Z.; Sirota, E.B. & Sinha, S.K. June 1, 1995.

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  • Deutsch, M. Bar Ilan Univ., Ramat-Gan (Israel). Physics Dept.
  • Ocko, B.M. Brookhaven National Lab., Upton, NY (United States). Physics Dept.
  • Wu, X.Z. Exxon Research and Engineering Co., Annandale, NJ (United States). Corporate Research Science Lab.
  • Sirota, E.B.
  • Sinha, S.K. Exxon Research and Engineering Co., Annandale, NJ (United States). Corporate Research Science Lab.

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Description

A new, rare surface freezing, phenomenon is observed in molten normal-alkanes and their derivatives (alcohols, thiols, etc.). X-ray and surface tension measurements show the formation of a crystalline monolayer on the surface of the liquid alkane at temperatures up to 3 C above the bulk solidification temperature, T{sub f}. For alcohols, a single bilayer is formed. In both cases, the molecules in the layer are hexagonally packed and oriented normal to the surface for short chain lengths, and tilted for long ones. In both cases the single layer persists down to T{sub f}. In terms of wetting theory, this constitutes a very limited partial wetting of the liquid surface by the crystalline layer. The new surface phase is obtained only for chain lengths 14 < n {le} 50 in alkanes, and 16 < n < 30 in alcohols. The measurements are satisfactorily accounted for within a simple theory based on surface energy considerations.

Physical Description

9 p.

Notes

OSTI as DE95013312

Source

  • Recontres de Moriond workshop, Villar-sur-Ollon (Switzerland), 21-28 Jan 1995

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  • Other: DE95013312
  • Report No.: BNL--61802
  • Report No.: CONF-950183--3
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/80963 | External Link
  • Office of Scientific & Technical Information Report Number: 80963
  • Archival Resource Key: ark:/67531/metadc733970

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • June 1, 1995

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • Dec. 4, 2015, 12:50 p.m.

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Deutsch, M.; Ocko, B.M.; Wu, X.Z.; Sirota, E.B. & Sinha, S.K. Surface crystallization in normal-alkanes and alcohols, report, June 1, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc733970/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.