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- 주제어 : Superhydrophobic grid (검색결과 3 건)
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Laser-induced superhydrophobic grid patterns on PDMS for droplet arrays formation
Farshchian, Bahador,Gatabi, Javad R.,Bernick, Steven M.,Park, Sooyeon,Lee, Gwan-Hyoung,Droopad, Ravindranath,Kim, Namwon Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.396 No.-
<P><B>Abstract</B></P> <P>We demonstrate a facile single step laser treatment process to render a polydimethylsiloxane (PDMS) surface superhydrophobic. By synchronizing a pulsed nanosecond laser source with a motorized stage, superhydrophobic grid patterns were written on the surface of PDMS. Hierarchical micro and nanostructures were formed in the irradiated areas while non-irradiated areas were covered by nanostructures due to deposition of ablated particles. Arrays of droplets form spontaneously on the laser-patterned PDMS with superhydrophobic grid pattern when the PDMS sample is simply immersed in and withdrawn from water due to different wetting properties of the irradiated and non-irradiated areas. The effects of withdrawal speed and pitch size of superhydrophobic grid on the size of formed droplets were investigated experimentally. The droplet size increases initially with increasing the withdrawal speed and then does not change significantly beyond certain points. Moreover, larger droplets are formed by increasing the pitch size of the superhydrophobic grid. The droplet arrays formed on the laser-patterned PDMS with wettability contrast can be used potentially for patterning of particles, chemicals, and bio-molecules and also for cell screening applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Superhydrophobic grid patterns were processed on the surface of PDMS using a pulsed nanosecond laser. </LI> <LI> Droplet arrays form instantly on the laser-patterned PDMS with the superhydrophobic grid pattern when the PDMS sample is simply immersed in and withdrawn from water. </LI> <LI> Droplet size can be controlled by controlling the pitch size of superhydrophobic grid and the withdrawal speed. </LI> </UL> </P>
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Davaasuren, G.,Ngo, C.V.,Oh, H.S.,Chun, D.M. New York] ; North-Holland 2014 APPLIED SURFACE SCIENCE - Vol.314 No.-
Herein we describe an economical method to fabricate a transparent superhydrophobic surface that uses grid patterning, and we report on the effects of grid geometry in determining the wettability and transparency of the fabricated surfaces. A polymer casting method was utilized because of its applicability to economical manufacturing and mass production; the material polydimethylsiloxane (PDMS) was selected because of its moldability and transparency. PDMS was replicated from a laser textured mold fabricated by a UV nanosecond pulsed laser. Sapphire wafer was used for the mold because it has very low surface roughness (Ra @?0.3nm) and adequate mechanical properties. To study geometric effects, grid patterns of a series of step sizes were fabricated. The maximum water droplet contact angle (WDCA) observed was 171<SUP>o</SUP>. WDCAs depended on the wetting area and the wetting state. The experimental results of WDCA were analyzed with Wenzel and Cassie-Baxter equations. The designed grid pattern was suitably transparent and structurally stable. Transmittance of the optimal transparent superhydrophobic surface was measured by using a spectrophotometer. Transmittance loss due to the presence of the grid was around 2-4% over the wavelength region measured (300-1000nm); the minimum transmittance observed was 83.1% at 300nm. This study also demonstrates the possibility of using a nanosecond pulsed laser for the surface texturing of a superhydrophobic surface.
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Zhao, Yun,Qin, Minglei,Wang, Anjie,Kim, Dongpyo WILEY‐VCH Verlag 2013 ADVANCED MATERIALS Vol.25 No.33
<P><B>Various hydrophobic hairy carbonaceous fibers</B> are obtained by a low‐temperature CVD process on catalyst‐patterned surface patches which are selectively coated with silica to make the surface superhydrophobic and yet allow strong water adhesion for the “Salvinia effect”. The versatility of the functional hairy fiber surfaces is demonstrated with a liquid barrier grid for cell microarray, a gas retaining capability under water/liquid for a membrane‐free microfluidic chemical process, and functionalized papillae for cell immobilization with green algae.</P>
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