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- 저자 : Parashuram Kallem (검색결과 2 건)
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A New era of water treatment technologies: 3D printing for membranes
Numan Yanar,Parashuram Kallem,Moon Son,Hosik Park,Seoktae Kang,Heechul Choi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.91 No.-
The commercialization of sustainable 3D printing technology changed the face of manufacturing with itsprecise and uniform sustainable fabrication. Therefore, like otherfields of science, research related towater treatment membranes has adopted this technology successfully, preventing the waste of hugeamounts of solvents and thus reducing the high carbon emissions caused by fabrication. Currently,critical research is being conducted in relation to the membrane modules and the fabrication of themembranes themselves. The module studies focus primarily on spacer production and the membranestudies are mostly concerned with the membrane surface. The membrane surface research hassuccessfully adapted inkjet printing for enhanced surface properties for high selectivity and foulingresistance through the printing of nano-materials on the membranes’ surfaces. Recently, 3D printing ofthe polymer membrane support or 3D printing-based interfacial polymerization has also beenintroduced into water treatment technologies. Since fouling resistance, selectivity and waterpermeability are the critical factors, many of the parameters can be controlled by the assistance ofbespoke and precise 3D printing fabrication. In this study, we examine key aspects of technology whichmay shed light on future studies regarding 3D printed water treatment membranes and we review thecritical developments to date.
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Capillary effect in Janus electrospun nanofiber membrane for oil/water emulsion separation
Liang, Yejin,Kim, Soyoung,Kallem, Parashuram,Choi, Heechul Elsevier 2019 CHEMOSPHERE - Vol.221 No.-
<P><B>Abstract</B></P> <P>Janus electrospun nanofiber membranes (J-ENMs) have attracted considerable interest as membranes for oil-in-water emulsion separation due to the opposite properties on each side of the membrane. Such properties can provide capillary effect and achieve water unidirectional transportation. However, the capillary effect on performances of the J-ENMs is still obscure. Therefore, it is highly important to investigate the relation of pore size, capillary pressure, and fluid flux of them. For this study, J-ENMs, which have a dual-layer structure with hydrophilic polyacrylonitrile (PAN) and hydrophobic polystyrene (PS) nanofibrous membranes simultaneously, were fabricated via the electrospinning process. Among the fabricated membranes, the large pore sizes of the PS layer of J-ENMs affected capillary pressure leading to a pure water flux increase of nine times that of the small pore size. For emulsion flux, oil droplets can pass through a large pore of the PS layer easily and can cause a decrease in emulsion flux. Nevertheless, the emulsion flux of J-ENMs was 1.7 times higher than that of single layer membrane, which showed a promising application for the oil/water separation field.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Janus membrane was fabricated by electrospinning process using PAN and PS. </LI> <LI> Higher cooperative capillary pressure revealed higher pure water flux. </LI> <LI> Janus membrane showed higher emulsion flux than single layer membrane. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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