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RISS 인기검색어
- 검색키워드
- 저자 : Droopad, Ravindranath (검색결과 2 건)
- 무료
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Scaling and mechanism of droplet array formation on a laser-ablated superhydrophobic grid
Farshchian, Bahador,Gatabi, Javad R.,Bernick, Steven M.,Lee, Gwan-Hyoung,Droopad, Ravindranath,Kim, Namwon Elsevier 2018 Colloids and surfaces. A, Physicochemical and engi Vol.547 No.-
<P><B>Abstract</B></P> <P>Superhydrophobic grid patterns were ablated on a hydrophobic polydimethylsiloxane (PDMS) substrate using a nanosecond pulsed laser. The substrate with a wettability contrast (superhydrophobic-hydrophobic) was vertically immersed in a pool of water and withdrawn at different speeds to form droplet arrays spontaneously. The size of droplets was tuned by controlling the withdrawal speed (<I>S</I> <SUB>w</SUB>), which resulted in different contact line speeds on non-irradiated cell (NIC) and laser-irradiated grid (LIG) areas with different surface properties of no-slip and partial-slip conditions, respectively. The ratio of the contact line speeds on NIC and LIG areas (<I>S</I> <SUB>NIC</SUB>/<I>S</I> <SUB>LIG</SUB>) decreased exponentially with the withdrawal speed, leading to formation of larger droplets on NIC. A geometric scaling model predicted the size of droplets formed on NIC arrays over a range of contact line speeds on NIC and LIG, the ratio of the contact line speeds, the withdrawal speed, and the size of NIC.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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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on the laser-patterned PDMS with superhydrophobic grid pattern when the PDMS sample is simply immersed in and withdrawn from water due to different wetting properties of the irradiated and non-irradiated areas.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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