Wetting on the microscale: shape of a liquid drop on a microstructured surface at different length scales

Langmuir : the ACS Journal of Surfaces and Colloids
Periklis PapadopoulosDoris Vollmer

Abstract

Describing wetting of a liquid on a rough or structured surface is a challenge because of the wide range of involved length scales. Nano- and micrometer-sized textures cause pinning of the contact line, reflected in a hysteresis of the contact angle. To investigate contact angles at different length scales, we imaged water drops on arrays of 5 μm high poly(dimethylsiloxane) micropillars. The drops were imaged by laser scanning confocal microscopy (LSCM), which allowed us to quantitatively analyze the local and large-scale drop profile simultaneously. Deviations of the shape of drops from a sphere decay at two different length scales. Close to the pillars, the amplitude of deviations decays exponentially within 1-2 μm. The drop profile approached a sphere at a length scale 1 order of magnitude larger than the pillars' height. The height and position dependence of the contact angles can be understood from the interplay of pinning of the contact line, the principal curvatures set by the topography of the substrate, and the minimization of the air-water interfaces.

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Citations

Feb 21, 2013·Nature Communications·Adam T Paxson, Kripa K Varanasi
Feb 12, 2014·Physical Chemistry Chemical Physics : PCCP·Zhengqing ZhangJoonkyung Jang
Jul 17, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·C W Extrand, Sung In Moon
Jul 6, 2014·Advances in Colloid and Interface Science·Hans-Jürgen ButtPeriklis Papadopoulos
Aug 21, 2015·Soft Matter·Frank SchellenbergerDoris Vollmer
Dec 4, 2014·Journal of Colloid and Interface Science·M SchmittF Heib
Feb 6, 2013·Proceedings of the National Academy of Sciences of the United States of America·Periklis PapadopoulosHans-Jürgen Butt
Nov 22, 2014·Soft Matter·Lena MammenDoris Vollmer
Jun 22, 2016·ACS Applied Materials & Interfaces·Jens W NeubauerAndreas Fery
Jul 28, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Charles W Extrand
Aug 20, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·C W Extrand
Sep 6, 2018·Soft Matter·Periklis PapadopoulosHans-Jürgen Butt
Nov 9, 2016·Beilstein Journal of Nanotechnology·Sabine AkerboomFrans A M Leermakers
Nov 2, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Periklis PapadopoulosHans-Jürgen Butt
Jun 15, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Michele Zanini, Lucio Isa
Feb 23, 2019·Materials·Katharina HartungErin Koos
Feb 2, 2021·ACS Applied Materials & Interfaces·Binyu ZhaoLongquan Chen
Apr 25, 2021·Journal of Colloid and Interface Science·Sumit SharmaFerhan Ayaydin
Nov 23, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Céline SadekRomain Jeantet
Jun 10, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Mandakini KanungoSusan Daniel
Dec 31, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Pengyu LvHuiling Duan
Mar 29, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Marouen Ben SaidHarald Garcke
Nov 28, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·D W PilatH-J Butt
Sep 25, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Mimmi ErikssonAgne Swerin
Jun 18, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Lizhong MuIchiro Ueno

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