A NEW SURFACE PHASE IN LIQUID NORMAL-ALKANES

被引：32

作者：

WU, XZ

OCKO, BM

SIROTA, EB

SINHA, SK

DEUTSCH, M

机构：

[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973

[2] BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL

来源：

PHYSICA A | 1993年 / 200卷 / 1-4期

关键词：

D O I：

10.1016/0378-4371(93)90583-P

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new surface phase is found in liquid normal-alkanes. X-ray and surface tension measurements show the formation of a crystalline monolayer on the surface of the liquid at temperatures up to 3-degrees-C above the bulk solidification temperature, T(f). The molecules in the monolayer are hexagonally packed and oriented normal to the surface. A single solid monolayer persists down to T(f), thus exhibiting a very limited partial wetting. The new surface phase is obtained only for chain lengths 14 < n less-than-or-equal-to 50. Its vanishing for n less-than-or-equal-to 14 is interpreted as a possible transition from surface freezing to surface melting behaviour. The measurements are satisfactorily accounted for within a simple theory based on surface energy considerations.

引用

页码：751 / 758

页数：8

共 16 条

[1] ANISOTROPIC MOLECULAR-DYNAMICS IN THE VICINITY OF ORDER-DISORDER TRANSITIONS IN ORGANIC MONOLAYERS [J].