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液滴在梯度微结构表面上的铺展动力学分析

林林 袁儒强 张欣欣 王晓东

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液滴在梯度微结构表面上的铺展动力学分析

林林, 袁儒强, 张欣欣, 王晓东

Spreading dynamics of liquid droplet on gradient micro-structured surfaces

Lin Lin, Yuan Ru-Qiang, Zhang Xin-Xin, Wang Xiao-Dong
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  • 本文通过改变肋柱宽度和间距, 构造了二级和多级梯度微结构表面, 采用格子-Boltzmann方法对液滴在两种梯度表面上的铺展过程进行了研究, 探析液滴运动的机理和调控方法. 结果表明, 在改变肋柱间距的二级梯度表面上, 当液滴处于Cassie态时, 接触角滞后大小与粗糙度梯度成正比关系; 当液滴从Cassie态转换为Wenzel态或介于两者之间的不稳定态时, 这一正比关系不再遵循. 在改变肋柱宽度的二级梯度表面上, 接触角滞后大小与粗糙度梯度始终成正比关系. 在多级梯度表面上, 随液滴初始半径增大, 接触角滞后减小, 但液滴平衡位置相较于初始位置偏离增大. 对梯度微结构表面上液滴运动和接触角滞后的定量分析, 可为实现梯度微结构表面液滴运动调控提供理论依据.
    Designed microtextured surfaces have shown promising applications in tuning the wettability of a liquid droplet on the surfaces and attracted great attention over the past decade; unfortunately, the effect of surface geometry on wetting properties is still poorly understood. In this work, two- and multi-stage pillar microtextures are designed to construct gradient surfaces by altering pillar width and spacing. Then, the multi-phase lattice-Boltzmann method (LBM) is used to investigate the wetting dynamics of a liquid droplet on the gradient surface. Results show that for the two-stage gradient surface with variable pillar spacing, the contact angle hysteresis is found to be proportional to the roughness gradient when droplet/surface system is in the Cassie-Baxter state. However, this proportional relation is no longer correct when the system is in the transition state between the Wenzel and Cassie-Baxter states. For the two-stage gradient surface with variable pillar spacing, the contact angle hysteresis always increases linearly with increasing roughness gradient. Results also show that when a larger droplet is placed on the multi-stage gradient surface, stronger droplet motion is observed due to the smaller contact angle hysteresis. The present LBM simulations provide a guideline for the design and manufacture of the microtextured surfaces to tune the droplet wettability and motion.
    • 基金项目: 国家自然科学基金(批准号: 51176010)资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51176010).
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    Kakade B, Mehta R, Durge A, Kulkarni S, Pillai V 2008 Nano Lett. 8 2693

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    Hong X, Gao X, Jiang L 2007 J. Am. Chem. Soc. 129 147

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    Lu G 2014 Ph. D. Dissertation (Beijing: Tsinghua University) (in Chinese) [陆规 2014 博士学位论文(北京: 清华大学)]

    [10]

    Erbil H Y, Demirel A L, Avci Y, Mert O 2003 Science 299 1377

    [11]

    Zu Y Q, Yan, Y Y, Li, J Q, Han Z W 2010 Journal of Bionic Engineering 7 191

    [12]

    Raiskinmaki P, Kopenen A, Merikoski J, Timonen J 2000 Comput. Mater. Sci 18 7

    [13]

    Lu G, Wang X D, Duan Y Y 2013 Colloids Surf. A 433 95

    [14]

    Varnik F, Gross M, Moradi N, Zikos G, Uhlmann P, Mller-Buschbaum P, Magerl D, Raabe D, Steinbach I, Stamm M 2011 Journal of Physics: Condens. Matter 23 184112

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    Li H B, Fang H P 2012 J. Adhes. Sci. Technol. 26 1873

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  • [1]

    de Gennes P G 1985 Rev. Mod. Phys. 57 827

    [2]

    Liang Z P, Wang X D, Duan Y Y, Min Q 2012 Colloids Surf. A 403 155

    [3]

    Martin C P, Blunt M O, Pauliac-Vaujour E, Stannard A, Moriarty P, Vancea I, Thiele U 2007 Phys. Rev. Lett. 99 116103

    [4]

    Vancauwenberghe V, Marco P D, Brutin D 2013 Colloids Surf. A 432 50

    [5]

    Pratap V, Moumen N, Subramanian R S 2008 Langmuir 24 5185

    [6]

    Kakade B, Mehta R, Durge A, Kulkarni S, Pillai V 2008 Nano Lett. 8 2693

    [7]

    Hong X, Gao X, Jiang L 2007 J. Am. Chem. Soc. 129 147

    [8]

    Ichimura K, Oh S K, Nakagawa M 2000 Science 288 1624

    [9]

    Lu G 2014 Ph. D. Dissertation (Beijing: Tsinghua University) (in Chinese) [陆规 2014 博士学位论文(北京: 清华大学)]

    [10]

    Erbil H Y, Demirel A L, Avci Y, Mert O 2003 Science 299 1377

    [11]

    Zu Y Q, Yan, Y Y, Li, J Q, Han Z W 2010 Journal of Bionic Engineering 7 191

    [12]

    Raiskinmaki P, Kopenen A, Merikoski J, Timonen J 2000 Comput. Mater. Sci 18 7

    [13]

    Lu G, Wang X D, Duan Y Y 2013 Colloids Surf. A 433 95

    [14]

    Varnik F, Gross M, Moradi N, Zikos G, Uhlmann P, Mller-Buschbaum P, Magerl D, Raabe D, Steinbach I, Stamm M 2011 Journal of Physics: Condens. Matter 23 184112

    [15]

    Li H B, Fang H P 2012 J. Adhes. Sci. Technol. 26 1873

    [16]

    Wang X D, Peng X F, Wang B X 2004 Chin. J. Chem. Eng. 12 615

计量
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  • PDF下载量:  6429
  • 被引次数: 0
出版历程
  • 收稿日期:  2015-04-13
  • 修回日期:  2015-05-13
  • 刊出日期:  2015-08-05

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