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- 검색키워드
- 저자 : Taekyung Kim (검색결과 248 건)
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Kim, Jaeyun,Kim, Hoe Suk,Lee, Nohyun,Kim, Taeho,Kim, Hyoungsu,Yu, Taekyung,Song, In Chan,Moon, Woo Kyung,Hyeon, Taeghwan WILEY-VCH Verlag 2008 Angewandte Chemie. international edition Vol.47 No.44
<B>Graphic Abstract</B> <P>Magnetic, fluorescent core–shell nanoparticles consist of a single Fe<SUB>3</SUB>O<SUB>4</SUB> nanocrystal core and a dye-doped mesoporous silica shell with a poly(ethylene glycol) coating (see picture of TEM images and schematic depictions). These nanoparticles can be used as magnetic resonance and fluorescence imaging agents, and as drug delivery vehicles, thus making them novel candidates for simultaneous cancer diagnosis and therapy. <img src='wiley_img/14337851-2008-47-44-ANIE200802469-content.gif' alt='wiley_img/14337851-2008-47-44-ANIE200802469-content'> </P>
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Kim, Jin-Soo,Kim, Hong-Kyu,Kim, Sung-Hoon,Kim, Inho,Yu, Taekyung,Han, Geun-Ho,Lee, Kwan-Young,Lee, Jae-Chul,Ahn, Jae-Pyoung American Chemical Society 2019 ACS NANO Vol.13 No.4
<P>Despite its effectiveness in improving the properties of materials, strain engineering has not yet been employed to endow catalytic characteristics to apparently nonactive metals. This limitation can be overcome by controlling simultaneously lattice strains and charge transfer originated from the epitaxially prepared bimetallic core-shell structure. Here, we report the experimental results of the direct H<SUB>2</SUB>O<SUB>2</SUB> synthesis enabled by a strained Au layer grown on Pd nanoparticles. This system can benefit the individual catalytic properties of each involved material, and the heterostructured catalyst displays an improved productivity for the direct synthesis of H<SUB>2</SUB>O<SUB>2</SUB> by ∼100% relative to existing Pd catalysts. This is explained here by exploring the individual effects of lattice strain and charge transfer on the alteration of the electronic structure of ultrathin Au layers grown on Pd nanoparticles. The approach used in this study can be viewed as a means of designing catalysts with multiple catalytic functions.</P> [FIG OMISSION]</BR>
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Im, Gwang-Bum,Kim, Yeong Hwan,Kim, Yu-Jin,Kim, Sung-Won,Jung, Euiyoung,Jeong, Gun-Jae,Wang, Ke,Kim, Jinheung,Kim, Dong-Ik,Kim, Tae-Hyung,Yi, Gi-Ra,Yu, Taekyung,Bhang, Suk Ho MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.19
<P>Injecting human mesenchymal stem cells (hMSCs) at wound sites is known to have a therapeutic effect; however, hMSCs have several limitations, such as low viability and poor engraftment after injection, as well as a potential risk of oncogenesis. The use of a conditioned medium (CM) was suggested as an alternative method for treating various wounds instead of direct hMSC administration. In addition to not having the adverse effects associated with hMSCs, a CM can be easily mass produced and can be stored for long-term, thereby making it useful for clinical applications. In general, a CM is collected from hMSCs with low passage number; whereas, the hMSCs with high passage number are usually discarded because of their low therapeutic efficacy as a result of reduced angiogenic factor secretion. Herein, we used a CM collected from high passage number (passage 12, P12) hMSCs treated with gold-iron nanoparticles (AuFe NPs). Our AuFe NPs were designed to release the iron ion intracellularly via endocytosis. Endosomes with low pH can dissolve iron from AuFe NPs, and thus, the intracellularly released iron ions up-regulate the hypoxia-inducible factor 1α and vascular endothelial growth factor (VEGF) expression. Through this mechanism, AuFe NPs improve the amount of VEGF expression from P12 hMSCs so that it is comparable to the amount of VEGF expression from low passage number (passage 6, P6), without treatment. Furthermore, we injected the CM retrieved from P12 MSCs treated with AuFe NPs in the mouse skin wound model (AuFe P12 group). AuFe P12 group revealed significantly enhanced angiogenesis in the mouse skin wound model compared to the high passage hMSC CM-injected group. Moreover, the result from the AuFe P12 group was similar to that of the low passage hMSC CM-injected group. Both the AuFe P12 group and low passage hMSC CM-injected group presented significantly enhanced re-epithelization, angiogenesis, and tissue remodeling compared to the high passage hMSC CM-injected group. This study reveals a new strategy for tissue regeneration based on CM injection without considering the high cell passage count.</P>
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Kim, Taekyung,Min, Cheongwan,Jung, Myungki,Lee, Jinhyung,Park, Changsu,Kang, Shinill Elsevier 2016 APPLIED SURFACE SCIENCE - Vol.389 No.-
<P><B>Abstract</B></P> <P>With increasing demand for means of controlling surface adhesion in various applications, including the semiconductor industry, optics, micro/nanoelectromechanical systems, and the medical industry, nano-engineered surfaces have attracted much attention. This study suggests a design methodology for nanostructures using the Derjaguin approximation in conjunction with finite element analysis for the control of adhesion forces. The suggested design methodology was applied for designing a nano-engineered surface with low-adhesion properties. To verify this, rectangular and sinusoidal nanostructures were fabricated and analyzed using force-distance curve measurements using atomic force microscopy and centrifugal detachment testing. For force-distance curve measurements, modified cantilevers with tips formed with atypical particles were used. Subsequently, centrifugal detachment tests were also conducted. The surface wettability of rectangular and sinusoidal nanostructures was measured and compared with the measured adhesion force and the number of particles remaining after centrifugal detachment tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A design method using the Derjaguin approximation with FEA for low-adhesion surface. </LI> <LI> Fabrication of nanostructures with small adhesion forces by presented design method. </LI> <LI> Characterization of adhesion force <I>via</I> AFM FD-curve with modified atypical tips. </LI> <LI> Verification of low-adhesion of designed surfaces using centrifugal detachment tests. </LI> <LI> Investigation of interdependence of hydrophobicity and anti-adhesion force. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Kim, Taekyung,Lee, Kyung Hyung,Lee, Jun Yeob The Royal Society of Chemistry 2018 Journal of Materials Chemistry C Vol.6 No.31
<P>An extremely long lifetime blue organic light-emitting diode (OLED) was developed through managing the electron density and an S-shaped variation of efficiency in blue fluorescent organic light-emitting diodes (FOLEDs) using carrier blocking layers and systematically analyzed in conjunction with the efficiency-lifetime interrelationship. Firstly, with a sensing layer, the majority carriers in the emitting layer were identified as a function of applied voltage and found to be electrons in our FOLEDs. In our reference device, both hole and electron leakage currents are present. To analyze the influence of leakage current on the efficiency variation and lifetime in our devices, two different classes of hole blocking layers were inserted between the emitting layer and the electron transport layer. By managing electron injection into the emitting layer, we successfully and simultaneously controlled the S-shape feature in efficiency and improved the operational stability, which resulted in a state of the art blue lifetime of 300 h at 500 cd m<SUP>−2</SUP> up to 97% of the initial luminance. The lifetime of the blue FOLEDs was extended by more than 5 times by introducing an electron-leakage suppressing carrier blocking material at the interface between charge transport layers and emitting layers.</P>
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Kim, Taekyung,Park, Jongsik,Jin, Haneul,Oh, Aram,Baik, Hionsuck,Joo, Sang Hoon,Lee, Kwangyeol The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.21
<P>Highly active and durable electrocatalysts for the hydrogen evolution reaction (HER) may play a pivotal role in commercial success of electrolytic water splitting technology. Among various material classes, binary metal sulphides show a great promise as HER catalysts because of their tunable energy levels conducive to a high catalytic activity and high robustness under harsh operating conditions. On the other hand, facet-controlled nanoparticles with controlled surface energies have gained great recent popularity as active and selective catalysts. However, binary metal sulphide nanoparticles with well-defined facets and high surface areas are very rare. Herein we report the synthesis of a facet-controlled hollow Rh3Pb2S2 nanocage as a new catalytic material and its excellent activity (overpotential: 87.3 mV at 10 mA cm<SUP>−2</SUP>) and robustness toward HER under harsh acidic conditions.</P>
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