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Nguyen, Huy Truong,Lee, Dong-Kyu,Choi, Young-Geun,Min, Jung-Eun,Yoon, Sang Jun,Yu, Yun-Hyun,Lim, Johan,Lee, Jeongmi,Kwon, Sung Won,Park, Jeong Hill Elsevier 2016 Journal of pharmaceutical and biomedical analysis Vol.124 No.-
<P><B>Abstract</B></P> <P>Ginseng, the root of <I>Panax ginseng</I> has long been the subject of adulteration, especially regarding its origins. Here, 60 ginseng samples from Korea and China initially displayed similar genetic makeup when investigated by DNA-based technique with 23 chloroplast intergenic space regions. Hence, <SUP>1</SUP>H NMR-based metabolomics with orthogonal projections on the latent structure-discrimination analysis (OPLS-DA) were applied and successfully distinguished between samples from two countries using seven primary metabolites as discrimination markers. Furthermore, to recreate adulteration in reality, 21 mixed samples of numerous Korea/China ratios were tested with the newly built OPLS-DA model. The results showed satisfactory separation according to the proportion of mixing. Finally, a procedure for assessing mixing proportion of intentionally blended samples that achieved good predictability (adjusted R<SUP>2</SUP> =0.8343) was constructed, thus verifying its promising application to quality control of herbal foods by pointing out the possible mixing ratio of falsified samples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NMR-based metabolomics well distinguished geographical authenticity of <I>Panax ginseng.</I> </LI> <LI> OPLS-DA model showed clear discrimination between Korean and Chinese samples. </LI> <LI> Mixing proportion estimation model that achieved good predictability was constructed. </LI> <LI> Our method and estimation model can also be applied to other herbal plants as well. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Transparent Epoxy resin toughened with In-situ azide-alkyne Polymerized Aliphatic Toughening agent
( Nho Hoon Kwak ),( Jun Huy Yu ),( Su Hyun Lim ),( Bum Jae Lee ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
To improve the toughness of the epoxy resin while maintaining their transparency, a novel polymer, which has an aliphatic structure, is synthesized via in-situ azide-alkyne polymerization as a toughening agent. Because of the dissimilar kinetics of the epoxy system and click reaction, sequential curing process was designed. There in-situ toughened epoxy with about 10wt% content of in-situ toughener of poly(BAC/PCLDA) showed excellent increase of fracture toughness while the transmittance of epoxy system was maintained. The homogeneous phase for the fracture surface of in-situ toughened epoxies in SEM micrographs was quite different from the two-phase morphology for the conventional preformed polymer-toughened epoxy systems.
Chae, Sang Hoon,Yu, Woo Jong,Bae, Jung Jun,Duong, Dinh Loc,Perello, David,Jeong, Hye Yun,Ta, Quang Huy,Ly, Thuc Hue,Vu, Quoc An,Yun, Minhee,Duan, Xiangfeng,Lee, Young Hee Nature Publishing Group 2013 Nature materials Vol.12 No.5
Despite recent progress in producing transparent and bendable thin-film transistors using graphene and carbon nanotubes, the development of stretchable devices remains limited either by fragile inorganic oxides or polymer dielectrics with high leakage current. Here we report the fabrication of highly stretchable and transparent field-effect transistors combining graphene/single-walled carbon nanotube (SWCNT) electrodes and a SWCNT-network channel with a geometrically wrinkled inorganic dielectric layer. The wrinkled Al<SUB>2</SUB>O<SUB>3</SUB> layer contained effective built-in air gaps with a small gate leakage current of 10<SUP>−13</SUP> A. The resulting devices exhibited an excellent on/off ratio of ~10<SUP>5</SUP>, a high mobility of ~40 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and a low operating voltage of less than 1 V. Importantly, because of the wrinkled dielectric layer, the transistors retained performance under strains as high as 20% without appreciable leakage current increases or physical degradation. No significant performance loss was observed after stretching and releasing the devices for over 1,000 times. The sustainability and performance advances demonstrated here are promising for the adoption of stretchable electronics in a wide variety of future applications.