Contact Angle of Glycerol Nanodroplets Under van der Waals Force

被引：17

作者：

Ma, Jun ^{[2
,3
]}

Jing, Guangyin ^{[2
,5
]}

Chen, Shiyi ^{[1
,4
]}

Yu, Dapeng ^{[2
]}

机构：

[1] Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China

[2] Peking Univ, Dept Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China

[3] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

[4] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[5] ESPCI, CNRS, UMR 7615, F-75231 Paris 05, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 36期

关键词：

DROP SIZE DEPENDENCE; LINE TENSION; HETEROGENEOUS NUCLEATION; HYSTERESIS; NANOSCALE;

D O I：

10.1021/jp905350p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have studied the contact angle of glycerol nanodroplets on a partial wetting substrate using the tapping mode of an atomic force microscope. Our experiment shows strong contact angle hysteresis of nanodroplets (radius <100 nm) on mica substrate with atomic-level roughness. The theoretical analysis reveals and our experiment confirms that the van der Waals (vdW) force becomes a critical factor for the mechanical balance of droplets as the drop size reduces to nanometers. The vdW force introduces a dispersion force that significantly lowers the force threshold for producing contact angle hysteresis.

引用

页码：16169 / 16173

页数：5

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