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Surface crystallization of liquid n-alkanes and alcohol monolayers studied by surface vibrational spectroscopy

✍ Scribed by G.A. Sefler; Q. Du; P.B. Miranda; Y.R. Shen

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 610 KB
Volume: 235
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)00147-v

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✦ Synopsis

Infrared-visible sum-frequency generation (SFG) has been used to obtain the surface vibrational spectra of CH stretches for liquid n-eicosane and a monolayer film of 1-dodecanoi in equilibrium with an excess drop on water. The SFG data for surface freezing of eicosane represent a unique study of ordering among nonpolar surface molecules and are consistent with the formation of a solid monolayer of nearly vertical, all-trans molecules at the free liquid surface. For the dodecanol film, the result indicates that the alcohol molecules are nearly all-trans and erect both before and after surface crystallization.

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