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Department of Electrical Engineering and Automation

Wetting and microfluidics

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We have designed, which can confine the wetting of liquids even with very low surface tension.

We have also discovered that the electron beam of environmental scanning electron microscope (ESEM) can  of 150潞 and features as small as 1 碌m.

We also applied the hydrophilic-superhydrophobic patterns for gravity-induced and . 

Cover of Advanced Materials journal magazine for year 2013, Vol. 25, No. 16. The background is gray. On center there is a shperical droplet dyed blue, lying on the surface of silicon. Around it there are two perfectly circular rings of water. The reflection on the Silicon surface cast their mirror image.
Undercut structure controlling droplet spread.
robotic instruments - Maskless, High鈥怭recision, Persistent, and Extreme Wetting鈥怌ontrast Patterning in an Environmental Scanning Electron Microscope
E-beam writing of superhydrophilic wetting patterns on superhydrophobic substrate.
robotic instruments - Sliding droplets on hydrophilic/superhydrophobic patterned surfaces for liquid deposition
Sliding distributing of nanoliter droplet on patterned substrate.

Selected publications:

  1. Liimatainen, V., Sariola, V., Zhou, Q., "", Advanced Materials, Vol. 25(16), pp. 2275鈥2278 (frontispiece on page 2274), 2013.
  2. Liimatainen, V., Shah. A., Johansson, L., Houbenov, N. and Zhou, Q., 鈥溾,&苍产蝉辫;Small, vol. 12 (14), pp. 1847-1853, 2016.
  3. Chang, B., Kivinen, O., Pini, I, Levkin, P.A., Ras, R.H.A., Zhou, Q., 鈥溾,&苍产蝉辫;Soft Matter, 4 (36): 7500-7506, 2018.

  4. Chang, B., Zhou, Q., Ras, R., Shah, A., Wu, Z., Hjort, K., 鈥溾,&苍产蝉辫;Applied Physics Letters, vol. 108, 154102, 2016.

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