Physics of Fluids - Publications

Mixed mode of dissolving immersed nanodroplets at a solid-water interface

Soft Matter 11, 1889–1900 (2015)
See also: inside front cover of that issue

Authors

	Xuehua Zhang
	Jun Wang
	Lei Bao
	Erik Dietrich
	Roeland van der Veen
	Shuhua Peng
	James Friend
	Harold J. W. Zandvliet
	Leslie Yeo
	Detlef Lohse

BibTeΧ

@Article{C4SM02397H,
author ="Zhang, Xuehua and Wang, Jun and Bao, Lei and Dietrich, Erik and van der Veen, Roeland C. A. and Peng, Shuhua and Friend, James and Zandvliet, Harold J. W. and Yeo, Leslie and Lohse, Detlef",
title  ="Mixed mode of dissolving immersed nanodroplets at a solid-water interface",
journal  ="Soft Matter",
year  ="2015",
volume  ="11",
issue  ="10",
pages  ="1889-1900",
publisher  ="The Royal Society of Chemistry",
doi  ="10.1039/C4SM02397H",
url  ="http://dx.doi.org/10.1039/C4SM02397H",
abstract  ="The dissolution dynamics of microscopic oil droplets (less than 1 [small mu ]m in height{,} i.e. nanodroplets) on a hydrophobilized silicon surface in water was experimentally studied. The lateral diameter was monitored using confocal microscopy{,} whereas the contact angle was measured by (disruptive) droplet polymerisation of the droplet. In general{,} we observed the droplets to dissolve in a mixed mode{,} i.e.{,} neither in the constant contact angle mode nor in the constant contact radius mode. This means that both the lateral diameter and the contact angle of the nanodroplets decrease during the dissolution process. On average{,} the dissolution rate is faster for droplets with larger initial size. Droplets with the same initial size can{,} however{,} possess different dissolution rates. We ascribe the non-universal dissolution rates to chemical and geometric surface heterogeneities (that lead to contact line pinning) and cooperative effects from the mass exchange among neighbouring droplets."}