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11.
Zipping effect on omniphobic surfaces for controlled deposition of minute amounts of fluid or colloids 总被引:1,自引:0,他引:1
Dufour R Brunet P Harnois M Boukherroub R Thomy V Senez V 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(8):1229-1236
When a drop sits on a highly liquid-repellent surface (super-hydrophobic or super-omniphobic) made of periodic micrometer-sized posts, its contact-line can recede with very weak mechanical retention providing that the liquid stays on top of the microsized posts. Occurring in both sliding and evaporation processes, the achievement of low-contact-angle hysteresis (low retention) is required for discrete microfluidic applications involving liquid motion or self-cleaning; however, careful examination shows that during receding, a minute amount of liquid is left on top of the posts lying at the receding edge of the drop. For the first time, the heterogeneities of these deposits along the drop-receding contact-line are underlined. Both nonvolatile liquid and particle-laden water are used to quantitatively characterize what rules the volume distribution of deposited liquid. The experiments suggest that the dynamics of the liquid de-pinning cascade is likely to select the volume left on a specific post, involving the pinch-off and detachment of a liquid bridge. In an applied prospective, this phenomenon dismisses such surfaces for self-cleaning purposes, but offers an original way to deposit controlled amounts of liquid and (bio)-particles at well-targeted locations. 相似文献
12.
Nicolas Verplanck Yannick Coffinier Vincent Thomy Rabah Boukherroub 《Nanoscale research letters》2007,2(12):577-596
The wetting properties of superhydrophobic surfaces have generated worldwide research interest. A water drop on these surfaces
forms a nearly perfect spherical pearl. Superhydrophobic materials hold considerable promise for potential applications ranging
from self cleaning surfaces, completely water impermeable textiles to low cost energy displacement of liquids in lab-on-chip
devices. However, the dynamic modification of the liquid droplets behavior and in particular of their wetting properties on
these surfaces is still a challenging issue. In this review, after a brief overview on superhydrophobic states definition,
the techniques leading to the modification of wettability behavior on superhydrophobic surfaces under specific conditions:
optical, magnetic, mechanical, chemical, thermal are discussed. Finally, a focus on electrowetting is made from historical
phenomenon pointed out some decades ago on classical planar hydrophobic surfaces to recent breakthrough obtained on superhydrophobic
surfaces. 相似文献
13.
A feasibility study of thin stoichiometric Bi2Te3 films by pulsed laser deposition (PLD) was performed, the difficulty arising from the differences of vapour pressure between Te and Bi. The films were elaborated using a pulsed Nd:YAG laser under various experimental conditions and were characterized by electron microsprobe, scanning electron microscopy, X-ray diffraction and secondary ion mass spectroscopy analyses. Congruent transfer of stoichiometry occurs from the target to the substrate on several cm2 and a good crystallinity can be achieved, even on glass substrates at room temperature, by combining convenient target to substrate facing and distance, respectively. Depletion in Te observed in some films may result from a laser beam-plume interaction that was put forward during elaboration of films on large scale substrates. 相似文献
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