SURFACE-TENSION MEASUREMENTS OF SURFACE FREEZING IN LIQUID NORMAL-ALKANES

被引:232
作者
WU, XZ
OCKO, BM
SIROTA, EB
SINHA, SK
DEUTSCH, M
CAO, BH
KIM, MW
机构
[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973
[2] BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL
关键词
D O I
10.1126/science.261.5124.1018
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Surface tension measurements reveal surface freezing in liquid n-alkanes. A solid monolayer of molecules is found to exist up to 3-degrees-C above the bulk freezing point. This surface phase exists only for carbon numbers 14 < n less-than-or-equal-to 50. The measured carbon number and temperature dependence of the surface tension is interpreted within a simple thermodynamical model based on known bulk latent heat data and surface energy considerations. The vanishing of the surface phase for n less-than-or-equal-to 14 is a possible transition from surface freezing to surface melting behavior.
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页码:1018 / 1021
页数:4
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