Directional wetting properties of topographically micro-patterned surfaces

地形微图案表面的定向润湿特性

基本信息

项目摘要

Surfaces equipped with microscopic structures often display unusual wetting properties. Liquids droplets brought into contact with the microstructures typically exhibit a directional depedence of their mobility. In many cases, one can observe an enhanced mobility of the liquid into certain directions of the structures. Goal of the present project is a comprehensive study of directional wetting phenomena on surfaces that are decorated with a regular pattern of micro-posts with uniform cross-section. First, we will consider the case of partially wetting liquids, i.e. liquids which form droplets on the micropatterned surface that are large compared to the typical dimensions of the structures. The apparent contact angle at which the liquid-air interface just starts to move is determined by the relative orientation of the interface with respect to the micro-pattern. These "advancing" and "receding" contact angles shall be computed with numerical models of the interface in contact to the micro-patterned surface. The typically unsteady advancement of the interface can be described by a spectrum of characteristic interfacial instabilities that occur in the vicintiy of the three-phase contact line between the liquid, air, and the substrate material. In case of highly wetting liquids, one may observe the formation of a liquid film that is wicking the micro-structures. Also in the latter case, a strong directional dependence of the liquid motion is observed which can lead to a facetting of the propagating film edge. Similar to the advancing modes of an inteface for liquid that do not form a film, we will investigate the mechanisms underlying the facetting in numerical models. In the limit of large constrasts of the advancing contact angle into different directions, we propose the possibilty to observe distinct characteristic shapes of growing droplets. These shapes shall be computed for a arbitrary dependence of the advancing contact angle on the orientation of the interface. For lage contrasts, we expect to observe a unidirectional, i.e. filamenteous droplet growth, while for small constrats, the growing liquid will form deformed spherical caps. To reach further conclusions about the directional dependence of the propagation velocity of a liquid film in the microstructures, we will compute the viscous flow resistance of the film for various structures and filling degress. This flow resistance will be further employed to fomulate a coarse grained model for the liquid film dynamics.
具有微观结构的表面通常显示出不寻常的润湿特性。与微结构接触的液滴通常表现出其流动性的方向依赖性。在许多情况下,可以观察到液体向结构的某些方向的增强的流动性。本项目的目标是对表面上的定向润湿现象进行全面研究,这些表面装饰有具有均匀横截面的规则图案的微柱。首先,我们将考虑部分润湿液体的情况,即在微图案化表面上形成与结构的典型尺寸相比较大的液滴的液体。液体-空气界面刚开始移动时的表观接触角由界面相对于微图案的相对取向决定。这些“前进”和“后退”接触角应使用与微图案化表面接触的界面的数值模型来计算。界面的典型不稳定前进可以通过在液体、空气和基底材料之间的三相接触线附近发生的特征界面不稳定性的谱来描述。在高度润湿的液体的情况下,可以观察到毛细作用微结构的液体膜的形成。同样在后一种情况下,观察到液体运动的强烈方向依赖性,这可能导致传播膜边缘的刻面。类似于不形成膜的液体界面的前进模式,我们将研究数值模型中小面化的机制。在限制大的约束的前进接触角到不同的方向,我们提出的可能性,以观察不同的特征形状的增长液滴。这些形状应根据前进接触角对界面方向的任意依赖性进行计算。对于拉格对比度,我们期望观察到单向的,即丝状液滴生长,而对于小的对比度,生长的液体将形成变形的球冠。为了进一步得出有关微结构中液膜传播速度方向依赖性的结论,我们将计算不同结构和填充度下液膜的粘性流动阻力。该流动阻力将进一步用于建立液膜动力学的粗粒度模型。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Directional liquid wicking in regular arrays of triangular posts.
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Professor Dr. Ralf Seemann其他文献

Professor Dr. Ralf Seemann的其他文献

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{{ truncateString('Professor Dr. Ralf Seemann', 18)}}的其他基金

Single motion and collective behavior of self-propelling droplets driven by Marangoni flow
马兰戈尼流驱动自推进液滴的单运动和集体行为
  • 批准号:
    254569848
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Structure Formation in Thin Liquid-Liquid Films
液-液薄膜中的结构形成
  • 批准号:
    167121686
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Dynamics of Morphological Wetting Transitions on Topographic Substrates
地形基底上形态润湿转变的动力学
  • 批准号:
    5425482
  • 财政年份:
    2004
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Understanding of pore scale displacement processes for Newtonian and complex fluids through the interaction of fluid properties and pore geometry.
通过流体性质和孔隙几何形状的相互作用了解牛顿流体和复杂流体的孔隙尺度驱替过程。
  • 批准号:
    495227335
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Dynamic wetting and dewetting of viscous liquid droplets/films on viscoelastic substrates
粘弹性基底上粘性液滴/​​薄膜的动态润湿和反润湿
  • 批准号:
    422786086
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes

相似国自然基金

浸润特性调制的统计热力学研究
  • 批准号:
    21173271
  • 批准年份:
    2011
  • 资助金额:
    58.0 万元
  • 项目类别:
    面上项目

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Effect of biofilm formation on multiphase flow and wetting properties during cyclic injection of hydrogen in rocks
岩石循环注氢过程中生物膜形成对多相流和润湿特性的影响
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    2901554
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Impact of Wetting Transparency on Lubricating and Adhesive Properties of Two-Dimensional Materials
润湿透明度对二维材料润滑和粘合性能的影响
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超防液表面:从润湿性能到抗生物污损性能
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Impact of Wetting Transparency on Lubricating and Adhesive Properties of Two-Dimensional Materials
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Impact of Wetting Transparency on Lubricating and Adhesive Properties of Two-Dimensional Materials
润湿透明度对二维材料润滑和粘合性能的影响
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Measurements and microscopic observation for surface wetting properties of water-insoluble soot particles in urban atmosphere
城市大气中不溶于水的烟尘颗粒表面润湿特性的测量和显微观察
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The effect of material properties and scaling on wetting of membranes used in membrane distillation
材料特性和结垢对膜蒸馏中膜润湿的影响
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用于测量未经处理/化学处理的钢和木线基材的润湿特性的微流体
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INFEWS N/P/H2O:EPRI:GOALI: A Novel Janus Membrane with Asymmetric Wetting Properties for Simultaneous Anti-wetting and Anti-fouling Membrane Distillation
INFEWS N/P/H2O:EPRI:GOALI:一种具有不对称润湿特性的新型 Janus 膜,可同时进行防润湿和防污膜蒸馏
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Multidimensional fractionation of suspended particles by use and modification of wetting properties / selective agglomeration
通过使用和修改润湿特性/选择性团聚对悬浮颗粒进行多维分级
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