Understanding the wetting of micro-textured surfaces can help give them new functionalities

Snapshots of contact line configurations when water droplets slide on surfaces with micro-pillars. Credit

Credit: S. Qiao, Q. Li and X. Q. Feng (2018), Sliding friction and contact angle hysteresis of droplets on micro-hole-structured surfaces, Eur. Phys. Jour. E 41:25, DOI 10.1140/epje/i2018-11631-x

The wetting and adhesion characteristics of solid surfaces critically depend on their fine structures. However, until now, our understanding of exactly how the sliding behaviour of liquid droplets depends on surface microstructures has been limited. Now, physicists Shasha Qiao, Qunyang Li and Xi-Qiao Feng from Tsinghua University in Beijing, China have conducted experimental and theoretical studies on the friction of liquid droplets on micro-structured surfaces. In a paper published in EPJ E, the authors found that under the same solid fraction, friction on surfaces with a structure made up of micro-holes is much higher than that on surfaces patterned with an array of pillars. Such micro-structured surfaces have helped design new surfaces that mimic surfaces found in nature, such as self-cleaning surfaces, reduced-drag surfaces, surfaces capable of transporting liquids in microfluidic systems, variants with anti-icing or heat transfer properties, and even surfaces that facilitate oil-water separation.

In this study, the authors focus on the sliding behaviour of a droplet on micro-hole-structured surfaces. Recently, the same group of physicists showed that the percentage of space occupied by solids for a unit-area surface can indeed significantly affect liquid droplets’ sliding behaviour on surfaces with micro-pillar structures.

In this study, the authors demonstrate that the continuity of the surface micro-structures can also alter droplets’ sliding behaviour considerably. They show that the sliding friction increased with increasing solid area fraction. This conclusion was experimentally validated by actively sliding a water droplet on solid surfaces with micro-holes and micro-pillars of various sizes while simultaneously measuring the resultant sliding friction forces.

The authors then explain the contrast in friction between micro-hole and micro-pillar surfaces qualitatively by developing an improved theoretical model, which extends the classic wetting mechanics model by considering a finite effective width of the solid-liquid-gas contact line.

Story Source:

Materials provided by Springer. Note: Content may be edited for style and length.


Journal Reference:

  1. Shasha Qiao, Qunyang Li, Xi-Qiao Feng. Sliding friction and contact angle hysteresis of droplets on microhole-structured surfaces. The European Physical Journal E, 2018; 41 (2) DOI: 10.1140/epje/i2018-11631-x

Cite This Page:

Springer. “Understanding the wetting of micro-textured surfaces can help give them new functionalities: New theoretical model explains experimental measurement of the friction of liquid droplets sliding on micro-structured surfaces.” ScienceDaily. ScienceDaily, 22 February 2018. <www.sciencedaily.com/releases/2018/02/180222145059.htm>.

Springer. (2018, February 22). Understanding the wetting of micro-textured surfaces can help give them new functionalities: New theoretical model explains experimental measurement of the friction of liquid droplets sliding on micro-structured surfaces. ScienceDaily. Retrieved February 24, 2018 from www.sciencedaily.com/releases/2018/02/180222145059.htm

Springer. “Understanding the wetting of micro-textured surfaces can help give them new functionalities: New theoretical model explains experimental measurement of the friction of liquid droplets sliding on micro-structured surfaces.” ScienceDaily. www.sciencedaily.com/releases/2018/02/180222145059.htm (accessed February 24, 2018).

Mozaffar EtezadiFar

Founder at Energykade
Mozaffar owns degrees in electrical engineering as BSc and power management as MSc. He has worked in fields of energy and e-commerce. He believes that energy and IT can help each other to save more energy and our planet. So here is energykade...
Let your friends know too:
2 replies
  1. славянск на кубани краснодарского края фото
    славянск на кубани краснодарского края фото says:

    Я сама родилась на Кубани, некоторое время там росла. Многие места помню и знаю, но живу сейчас в другом месте. Очень симпатичен этот сайт https://kuban.photography . На нем такие живые, интересные фото Кубани, часто новые и уникальные. Просматривая, я нахожу такие фото Кубани, которые напоминают мне детство. Те места, которые я видела сама. Фотки иногда очень редкие, что слезы на глазах. Особенно нравятся церквушки и памятники.

    Такие фотографии придут в голову только истинным ценителям красот своей родины, мне так кажется. Некоторые фото есть обыденные, простые, некоторые от профессионалов. Мне симпатичны и те и другие. Обыденные трогают душу, а профессиональные я устанавливаю себе на рабочий стол на компьютере.

    На данном сайте, Кубань на фото особенно трогательная, красивая, наша. Очень нравится раздел с людьми. Иногда высматриваю знакомые лица, но пока не находила.

    автобус кубань фото

    В целом хорошая доза местной романтики тем людям, кто скучает по родным и дорогим сердцу местам или же просто хочет познакомиться с нашими красотами, мечтает приехать, возможно, отдохнуть. На сайте есть разделы с достопримечательностями, отдыхом, путешествиями, и сразу видно, куда стоит направляться…

    Reply

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply

Your email address will not be published. Required fields are marked *