Research on the Response Behaviors of Microdroplet/ Superhydrophobic Interface Forces under Voltage

doi:10.3901/JME.2022.17.240

Abstract

Abstract: Adjusting the solid/liquid interfacial behaviors has strong application prospects in the fields of microfluidic and lab-on-a-chip et al. The interaction forces and adhesion behaviors at microdroplet/superhydrophobic interface under voltage are systematically studied using a solid/liquid interface behavior measuring device. Results showed that the interaction forces are composed of a wetting force, a maximum force and a separation force under voltage. The wetting force, the maximum force and the separation force varied with voltage. In the static region, the forces increased slowly. In the transition region, the forces increased sharply, however, the forces remained unchanged in the saturation region. The variation of the forces is depended on the adhesion energy between droplet and solid under voltage. Theoretical analysis indicated that the adhesion energy is proportional to the electrical properties of the superhydrophobic surface and the square of the voltage. Further analysis found that the experimental adhesion energy is greater than the theoretical value, which might relate to the transition of the wetting state of droplets under voltage. An electrowetting hysteresis experiment verified that the variation of adhesion energy was related to the wetting state of droplet under voltage. The results show that the interaction forces and adhesion behaviors of the microdroplet/superhydrophobic interface can be effectively adjusted by voltage. The founding is expected to provide a guidance for controlling liquid/solid interfacial behaviors and to enrich the microfluidics theory.

Key words: solid-liquid interface, adhesion, voltage, superhydrophobic surface, micro-droplets

CLC Number:

TH136

ZHANG Yafeng, TANG Cheng, DONG Conghui, YU Jiaxin. Research on the Response Behaviors of Microdroplet/ Superhydrophobic Interface Forces under Voltage[J]. Journal of Mechanical Engineering, 2022, 58(17): 240-248.

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http://www.cjmenet.com.cn/EN/Y2022/V58/I17/240

References

[1] SUN Qiangqiang，WANG Dehui，LI Yanan，et al. Surface charge printing for programmed droplet transport[J]. Nature Materials，2019，18(9)：936-941.
[2] CHEN Huawei，ZHANG Pengfei，ZHANG Liwen，et al. Continuous directional water transport on the peristome surface of Nepenthes alata[J]. Nature，2016，532(7597)：85-89.
[3] WEI Xing，KAWAMURA G，MUTO H，et al. Fabrication on low voltage driven electrowetting liquid lens by dip coating processes[J]. Thin Solid Films，2016，608：16-20.
[4] GONG Jian，KIM C J. All-electronic droplet generation on-chip with real-time feedback control for EWOD digital microfluidics[J]. Lab on a Chip，2008，8(6)：898-906.
[5] LAI Yuekun，GAO Xuefeng，ZHUANG Huifang，et al. Designing superhydrophobic porous nanostructures with tunable water adhesion[J]. Advanced Materials，2009，21(37)：3799-3803.
[6] FORSBERG P，NIKOLAJEFF F，KARLSSON M. Cassie–Wenzel and Wenzel–Cassie transitions on immersed superhydrophobic surfaces under hydrostatic pressure[J]. Soft Matter，2011，7(1)：104-109.
[7] WANG Haijing，XI Xuekui，KLEINHAMMES A，et al. Temperature-induced hydrophobic-hydrophilic transition observed by water adsorption[J]. Science，2008，322：80-83.
[8] WANG Junwei，MAO Baodong，GOLE J L，et al. Visible-light-driven reversible and switchable hydrophobic to hydrophilic nitrogen-doped titania surfaces：Correlation with photocatalysis[J]. Na-noscale，2010，2(10)：2257-2261.
[9] MUGELE F，BARET J C. Electrowetting：From basics to applications[J]. Journal of Physics：Condensed Matter，2005，17(28)：R705-R774.
[10] NELSON W C，SEN P，KIM C J. Dynamic contact angles and hysteresis under electro-wetting-on-dielectric[J]. Langmuir，2011，27(16)：10319-10326.
[11] SAMAD M F，KOUZANI A Z，RAHMAN M M，et al. Design and fabrication of an electrode for low-actuation-voltage electro-wetting-on-dielectric devices[J]. Procedia Technology，2015，20：20-25.
[12] KHODAYARI M，CARBALLO J，CRANE N B. A material system for reliable low voltage anodic electrowetting[J]. Materials Letters，2012，69(1)：96-99.
[13] 李战华，吴健康，胡国庆，等. 微流控芯片中的流体流动 [M]. 北京：科学出版社，2012. LI Zhanhua，WU Jiankang，HU Guoqing，et al. Fluid flow in microfluidic chips[M]. Beijing：Science Press，2012.
[14] LIU Hong，DHARMATILLEKE S，MAURYA D K，et al. Dielectric materials for electro-wetting-on-dielectric actuation[J]. Microsystem technologies，2010，16(3)：449-460.
[15] WANG Jian，ZHANG Jianwen，LIU Shu，et al. The accurate control of the La₂O₃ hierarchical structure of the flower-like microspheres accompanied with vertical-standing nanopetals and the electrowetting responses with low voltage actuation[J]. Ceramics International，2020，46(8)：11232-11236.
[16] WANG Jian，JIN Hongxia，ZHANG Jianwen，et al. The preparation of urchin-like La₂O₃ film and the superlow voltage electrowetting-on-dielectric response[J]. Materials Letters，2018，233：207-210.
[17] BASU M，PARIHAR V，LINCON A，et al. Development of graphene oxide–PDMS composite dielectric for rapid droplet movement in digital microfluidic applications[J]. Chemical Engineering Science，2021，230：116175.
[18] FROZANPOOR I，COOKE M D，AMBUKAN V，et al. Continuous droplet-actuating platforms via an electric field gradient：Electrowetting and liquid dielectrophoresis[J]. Langmuir，2021，37(21)：6414-6422.
[19] 禹健，郭艳婕，杨雷. 固-液摩擦纳米发电机[J]. 机械工程学报，2021，57 (21)：160-181. YU Jian，GUO Yanjie，YANG Lei. Solid-Liquid triboelectric nanogenerator[J]. Journal of Mechanical Engineering，2021，57(21)：160-181.
[20] 王科，叶晶，龚圣捷，等. 剪切应力影响下近壁微液膜测量技术及波动特性研究[J]. 机械工程学报，2017，53(24)：70-76. WANG Ke，YE Jing，GONG Shengjie，et al. Experimental study on the dynamics of a thin liquid film under shearing force[J]. Journal of Mechanical Engineering，2017，53(24)：70-76.
[21] QI Lehua，LUO Jun，LI Li，et al. Simulation and experiment research of the uniform droplet spray process[J]. Chinese Journal of Mechanical Engineering，2008，44 (12)：86-92.
[22] ZHAO Xiaodan，FAN Haiming，LUO Jun，et al. Electrically adjustable，super adhesive force of a superhydrophobic aligned mno2 nanotube membrane[J]. Advanced Functional Materials，2011，21(1)：184-190.
[23] CHEN H，TANG T，AMIRFAZLI A. Effect of contact angle hysteresis on breakage of a liquid bridge[J]. The European Physical Journal Special Topics，2015，224(2)：277-288.
[24] MANNETJE D，BANPURKAR A，KOPPELMAN H，et al. Electrically tunable wetting defects characterized by a simple capillary force sensor[J]. Langmuir，2013，29(31)：9944-9949.
[25] QUINN A，SEDEV R，RALSTON J. Contact angle saturation in electrowetting[J]. Journal of Physical Chemistry B，2005，109(13)：6268-6275.
[26] LI Huabing，FANG Haiping. Hysteresis and saturation of contact angle in electrowetting on a dielectric simulated by the lattice Boltzmann method[J]. Journal of Adhesion Science & Technology，2012，26：1873-1881.
[27] 张泓筠. 超疏水表面微结构对其疏水性能的影响及应用[D]. 湘潭：湘潭大学，2013. ZHANG Hongjun. Influence of microstructure for superhydrophobic surfaces on superhydrophobicity and its application[D]. Xiangtan：Xiangtan University，2013.
[28] MUGELE F，HEIKENFELD J. Electrowetting：fundamental principles and practical applications [M]. New Jersey：John Wiley & Sons，2018
[29] YAN Yuying，GAO N，BARTHLOTT W. Mimicking natural superhydrophobic surfaces and grasping the wetting process：a review on recent progress in preparing superhydrophobic surfaces[J]. Advances in Colloid and Interface Science，2011，169(2)：80-105.
[30] PARIHAR V，BANDYOPADHYAY S，DAS S，et al. Anisotropic electrowetting on wrinkled surfaces：Enhanced wetting and dependency on initial wetting state[J]. Langmuir，2018，34(5)：1844-1854.
[31] BORMASHENKO E，POGREB R，BALTER S，et al. Electrically controlled membranes exploiting Cassie-Wenzel wetting transitions[J]. Scientific Reports，2013，3(1)：1-5.
[32] MANUKYAN G，VAN DEN ENDE J M O D，LAMMERTINK R G H，et al. Electrical switching of wetting states on superhydrophobic surfaces：A route towards reversible Cassie-to-Wenzel transitions[J]. Physical Review Letters，2011，106(1)：014501.
[33] HAN Zhaojun，TAY B，TAN C，et al. Electro-wetting control of Cassie-to-Wenzel transitions in superhydrophobic carbon nanotube-based nanocomposites[J]. ACS Nano，2009，3(10)：3031-3036.
[34] GUPTA R，SHETH D M，BOONE T K，et al. Impact of pinning of the triple contact line on electrowetting performance[J]. Langmuir，2011，27(24)：14923-14929.
[35] ZHANG Yafeng，WANG Yongning，WU Xiaolan，et al. Combined effects of pinning and adhesion force on solid\liquid interfacial friction behaviors under applied voltage[J]. Tribology International，2019，134：102-108.