http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jung, Sungwon,Park, Sohyeon,Choi, Woojin,Heo, Jiwoong,Kwon, Jaesung,Choi, Sunghwan,Hong, Jinkee Elsevier 2020 Journal of industrial and engineering chemistry Vol.84 No.-
<P><B>Abstract</B></P> <P>Technologies that can overcome the poor mechanical properties of the coatings with bacterial anti-adhesion effect based on super-wetting properties are still challenging. In this study, we developed a durable superhydrophilic nanocomposite coatings composed of polysaccharide matrix and organosilicate (OS) compound filler. In brief, carboxymethylcellulose (CMC) and chitosan (CS)-based multilayer films were fabricated via Layer-by-layer (LbL) assembly then crosslinking for the films was performed to improve inner stability and induce superhydrophilicity. As second step, we synthesized a biocompatible and robust organosilicate compound via sol-gel reaction and incorporate it as reinforcing filler into the superhydrophilic films. Consequently, durable hybrid superhydrophilic nanocomposites were coated on the substrate, and various chemical analysis and performance evaluations of the coatings were performed. The mechanical properties of the composite coatings were significantly improved due to the OS acting as a reinforcing filler in the multilayer films. Furthermore, the coatings exhibited excellent biocompatibility and transparency and exerted antibacterial effect based on superhydrophilic property. This study presents a practical strategy to solve the poor durability, the limitation of super-wetting coatings widely applied in various fields.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Carbon-based layer-by-layer nanostructures: from films to hollow capsules
Hong, Jinkee,Han, Jung Yeon,Yoon, Hyunsik,Joo, Piljae,Lee, Taemin,Seo, Eunyong,Char, Kookheon,Kim, Byeong-Su Royal Society of Chemistry 2011 Nanoscale Vol.3 No.11
<P>Over the past years, the layer-by-layer (LbL) assembly has been widely developed as one of the most powerful techniques to prepare multifunctional films with desired functions, structures and morphologies because of its versatility in the process steps in both material and substrate choices. Among various functional nanoscale objects, carbon-based nanomaterials, such as carbon nanotubes and graphene sheets, are promising candidates for emerging science and technology with their unique physical, chemical, and mechanical properties. In particular, carbon-based functional multilayer coatings based on the LbL assembly are currently being actively pursued as conducting electrodes, batteries, solar cells, supercapacitors, fuel cells and sensor applications. In this article, we give an overview on the use of carbon materials in nanostructured films and capsules prepared by the LbL assembly with the aim of unraveling the unique features and their applications of carbon multilayers prepared by the LbL assembly.</P> <P>Graphic Abstract</P><P>This Feature Article reports the nanostructured carbon films and capsules prepared by layer-by-layer assembly with an aim of unraveling the unique features and their applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1nr10575b'> </P>
차아염소산수(HOCl)를 포함한 알지네이트 냉동 입자의 제작
정세진(Sejin Jung),이진기(Jinkee Lee) 한국가시화정보학회 2017 한국가시화정보학회지 Vol.15 No.2
Hypochlorous acid(HOCl) is a chemical that is a safe sanitizer and disinfectant approved by the Food and Drug Administration as a food additive, exhibiting strong sterilizing power with low effective chlorine concentration of pH 5.0-6.5 and effective chlorine concentration 10-80 ppm. To apply to fishery industries, we develope the HOCl ice for store or delivery of fishery products. However when HOCl is being frozen, the contained HOCl are expelled out from the ice due to the molecular structures of ice; there is no space to contain HOCl inside. To increase chlorine containing amount in ice, we develop the alginate particles containing HOCl which is bio comparable since alginate is a natural polymer extracted from the brown algae and it is widely used for drug delivery and containing substances, etc. We produce HOCl with water as base solution suppressing osmotic flow from fishery products, and mix it with the developed alginate particles and made HOCl-alginate ice and checked the remaining amount of HOCl. We measure the change of pH and chlorine concentration optimizing the best concentration of alginate particles. Finally, we produce the alginate particle HOCl ices with respect to the alginate’s optimal concentration.
Choi, Bong Gill,Hong, Jinkee,Park, Young Chul,Jung, Doo Hwan,Hong, Won Hi,Hammond, Paula T.,Park, HoSeok American Chemical Society 2011 ACS NANO Vol.5 No.6
<P>The chemistry and structure of ion channels within the polymer electrolytes are of prime importance for studying the transport properties of electrolytes as well as for developing high-performance electrochemical devices. Despite intensive efforts on the synthesis of polymer electrolytes, few studies have demonstrated enhanced target ion conduction while suppressing unfavorable ion or mass transport because the undesirable transport occurs through an identical pathway. Herein, we report an innovative, chemical strategy for the synthesis of polymer electrolytes whose ion-conducting channels are physically and chemically modulated by the ionic (not electronic) conductive, functionalized graphenes and for a fundamental understanding of ion and mass transport occurring in nanoscale ionic clusters. The functionalized graphenes controlled the state of water by means of nanoscale manipulation of the physical geometry and chemical functionality of ionic channels. Furthermore, the confinement of bound water within the reorganized nanochannels of composite membranes was confirmed by the enhanced proton conductivity at high temperature and the low activation energy for ionic conduction through a Grotthus-type mechanism. The selectively facilitated transport behavior of composite membranes such as high proton conductivity and low methanol crossover was attributed to the confined bound water, resulting in high-performance fuel cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-6/nn2013113/production/images/medium/nn-2011-013113_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn2013113'>ACS Electronic Supporting Info</A></P>
박종민(Jongmin Park),정세진(Sejin Jung),김응철(Eungchul Kim),이준권(Junkwon Lee),이진기(Jinkee Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Hypochlorous acid(HOCl) with a concentration of 10~80ppm is edible and harmless as well as having high disinfection effect. HOCl solution is made by electrolysis of hydrochloric acid and diluted by water. If fish products are stored with ice which is containing HOCl, it will benefit to disinfection effect as well as long-term storage. In this paper, we optimized flow rate of hydrochloric acid and current value to be able to product HOCl solution which had optimum qualification of pH and residual chlorine with numerical analysis using ANOM Analysis and Neural Network. Furthermore, we analyzed efficiency of freezing HOCl solution in several ways by measuring properties of HOCl solution and confirmed that the way to freeze HOCl solution is efficient in terms of disinfection effect. As a result, the case of freezing sealed with a slid was more efficient than the case of freezing without sealing with a slid, but both two cases were more inefficient than the case of storage at room temperature with no-freezing. Also, the ice which was made by ice making machine contained a very small amount of HOCl and it was proved theoretically by aspect of change amount of Gibbs free energy when HOCl particles are adsorbed in ice surface.
Ryu, Seungmi,Kim, Hyunbum,Kang, Seokyung,Shin, Kwangsoo,Jung, Seon-Yeop,Heo, Jiwoong,Han, Jin,Yoon, Jeong-Kee,Lee, Ju-Ro,Hong, Jinkee,Ahn, Kyung Hyun,Hyeon, Taeghwan,Hwang, Nathaniel Suk-Yeon,Kim, Byu American Chemical Society 2017 Chemistry of materials Vol.29 No.12
<P>Current heterogeneous cell assembly techniques in coculture systems rely on irreversible cell layering or a cell separation membrane. However, the techniques possess major drawbacks of inefficiency in direct interactions of the assembled cell layers and cell separation following coculture, which hamper characterization and therapeutic applications of the cells following coculture. Here, we develop a reversible cell layering platform for assembly of heterogeneous cells that allows both active direct cell cell interactions and facile cell separation. Anionic maleimide-chondroitin-sulfate is grafted onto the surface membrane of myogenic C2C12 cells and human mesenchymal stem cells (hMSCs) to modify the surface charge of the cells without cytotoxicity. A highly porous chitosan thin film is formed in situ interspacing between the heterogeneous cell layers via ionic cross-linking of cationic chitosan and anionic functionalized cells, forming compactly assembled double-layered cell constructs. The chitosan film enables layering of the cells, which allows active direct interactions between the cell layers, and facile delayering of the cells through simple treatment with mild shear stress. The developed platform promotes the myogenic commitment of hMSCs via direct contact with C2C12 cells, mimicking the interactions that trigger stem cell differentiation in vivo. Delivery of the myogenic committed cells to muscle injured animal models shows evident muscle regeneration.</P>