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Kim, Jihyeon,Lim, Ju Won,Mota, Filipe Marques,Lee, Ji-Eun,Boppella, Ramireddy,Lim, Keun Yong,Kim, Kyungkon,Choi, Won Kook,Kim, Dong Ha The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.45
<P>Transparent conductive electrodes (TCEs) are widely used in a wide range of optical-electronic devices. Recently, metal nanowires (NWs), e.g. Ag and Cu, have drawn attention as promising flexible materials for TCEs. Although the study of core-shell metal NWs, and the encapsulation/overcoating of the surface of single-metal NWs have separately been an object of focus in the literature, herein for the first time we simultaneously applied both strategies in the fabrication of highly stable Ag-Cu NW-based TCEs by the utilization of Ag nanoparticles covered with reduced graphene oxide (rGO). The incorporation of Ag nanoparticles by galvanic displacement reaction was shown to significantly increase the long term stability of the electrode. Upon comparison with a CuNW reference, our novel rGO/Cu-AgNW-based TCEs unveiled remarkable opto-electrical properties, with a 3-fold sheet resistance decrease (from 29.8 Omega sq(-1) to 10.0 Omega sq(-1)) and an impressive FOM value (139.4). No detrimental effect was noticed in the relatively high transmittance value (T = 77.6% at 550 nm) characteristic of CuNWs. In addition, our rGO/Cu-AgNW-based TCEs exhibited outstanding thermal stability up to 20 days at 80 degrees C in air, as well as improved mechanical flexibility. The superior performance herein reported compared with both CuNWs and AgNWs, and with a current conventional ITO reference, is believed to highlight the great potential of these novel materials as promising alternatives in optical-electronic devices.</P>
The development of gene carrier using cellulose nanocrystal and Zinc-DNA combination systems
Jihyeon Lee,Hanjin Yu,Kwang Suk Lim 강원대학교 산림과학연구소 2018 강원대학교 산림과학연구소 학술대회 Vol.2018 No.09
To effectively delivery of nucleic acids into the cells, various gene delivery systems are required. They protect nucleic acids against immune response, serum, and elimination mechanism. Nonviral gene delivery systems have low immune response, low side effect and temporary transfection compared with viral systems. Cellulose nanocrystal (CNC) is widely used as biomedical materials because of its good mechanical properties due to their lower weight, bbiocompatibility and biodegradability. In this study, we determined that CNC-Zinc/DNA combination systems (CZD cluster) could be deliver nucleic acids into the cells. CZD cluster successfully retarded migration of nucleic acids in agarose gel and enhanced DNA transfection efficiency into the cells. CZD cluster was spontaneously formed without any chemical reaction. This cluster systems could be used to deliver any plasmid DNA or siRNA in the cells and tissues without the requirement for a specific modification of the nucleic acids.