期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 365, 期 1, 页码 254-259出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.09.007
关键词
Droplet; Evaporation; Contact angle; Constant contact radius; Hydrophobic surfaces
资金
- National Natural Science Foundation of China (NSFC) [11002051, 11072244]
- National Basic Research Program of China (973 Program) [2007CB310500]
Experiments of sessile water droplet evaporation on both polydimethylsiloxane (PDMS) and Teflon surfaces were conducted. All experiments begin with constant contact area mode (the initial contact angle is greater than 90 degrees), switch to constant contact angle mode and end with mixed mode. Based on the assumptions of spherical droplet and uniform concentration gradient, theoretical analyses for both constant contact area and constant contact angle modes are made and theoretical solutions are derived accordingly, especially a theoretical solution of contact angle is presented first for CCR stage with any value of the initial contact angle. Moreover, comparisons between the theoretical solutions and experimental data of contact angle in CCR stage demonstrate the validity of the theoretical solution and it would help for a better understanding and application of water droplet on solid surfaces, which is quite often encountered in lab-on-a-chip, polymerase chain reaction (PCR) and other micro-fluidics devices. (C) 2011 Elsevier Inc. All rights reserved.
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