Quasi-static motion of microparticles at the depinning contact line of an evaporating droplet on PDMS surface

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SCIENCE CHINA Physics, Mechanics & Astronomy
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SCIENCE CHINA Physics, Mechanics & Astronomy, Volume 60, Issue 9: 094612(2017) https://doi.org/10.1007/s11433-017-9060-3

Quasi-static motion of microparticles at the depinning contact line of an evaporating droplet on PDMS surface

Ying-Song Yu1,*, Xue-Lian Xia1, Xu Zheng2, Xianfu Huang2,3, Jin-Zhi Zhou1
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  • ReceivedApr 17, 2017
  • AcceptedMay 16, 2017
  • PublishedJul 14, 2017
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Abstract

In this paper, evaporation of sessile water droplets containing fluorescent polystyrene (PS) microparticles on polydimethylsiloxane (PDMS) surfaces with different curing ratios was studied experimentally using laser confocal microscopy. At the beginning, there were some microparticles located at the contact line and some microparticles moved towards the line. Due to contact angle hysteresis, at first both the contact line and the microparticles were pinned. With the depinning contact line, the microparticles moved together spontaneously. Using the software ImageJ, the location of contact lines at different time were acquired and the circle centers and radii of the contact lines were obtained via the least square method. Then the average distance of two neighbor contact lines at a certain time interval was obtained to characterize the motion of the contact line. Fitting the distance-time curve at the depinning contact line stage with polynomials and differentiating the polynomials with time, we obtained the velocity and acceleration of both the contact line and the microparticles located at the line. The velocity and the maximum acceleration were, respectively, of the orders of 1?μm/s and 20-200?nm/s2, indicating that the motion of the microparticles located at the depinning contact line was quasi-static. Finally, we presented a theoretical model to describe the quasi-static process, which may help in understanding both self-pinning and depinning of microparticles.


Funded by

work was supported by the Natural Science Foundation of China(11572114)

CAS strategic priority research program(XDB22040403)

Opening fund of State Key Laboratory of Nonlinear Mechanics(LNM)

CAS Key Research Program of Frontier Sciences(QYZDJ-SSW-JSC019)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11572114, 11572335, and U1562105), the Opening Fund of State Key Laboratory of Nonlinear Mechanics (LNM), the CAS Strategic Priority Research Program (Grant No. XDB22040403), and the CAS Key Research Program of Frontier Sciences (Grant No. QYZDJ-SSW-JSC019).


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