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Seunghyup OH,Hiroshi MIZUNO,Toshinori KOZAKI,Soonsung HONG,Kyunghun PARK,Rokyeon Hwang,Yoshiaki KONO 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.05
Substrate affinity and insecticide sensitivity of acetylcholinesterase (AChE) from Daphnia magna S., Bombyx mori L., Musca domestica L., Myzus persicae S., Anguilla anguilla L., Cyprinus carpio L., Oryzias latipes T.&S., Homo sapiens L., Bos taurus L. were tested. The Km values of M. domestica AChE to acetylthiocholine (ATCh), propionylthiocholine (PTCh), butyrylthiocholine (BTCh) were 57.3 μM, 13.4 μM and 85.9 μM respectively, which were lower than those of A. anguilla, C. carpio, O. latipes, H. sapiens and B. taurus. In nontarget organisms, the I50 values of AChE to fenitroxon and DDVP were 1.5×10-6 M~7.8×10-5 M and 2.4×10-6 M~1.1×10-4 M respectively, thus they have lower sensitivity compared with M. domestica. The I50 value of M. persicae AChE to pirimicarb was 1.3×10-8 M, which was higher sensitivity compared with other test animals except D. magna. The I50 values of D. magna AChE to fenitroxon, DDVP, carbaryl, eserine, pirimicarb were 5.2×10-10 M~2.1×10-8 M, which were higher sensitivity compared with the other test animals used for this study. cDNA of Daphnia magna AChE precursor was sequenced and compared with those of Musca domestica, Drosophila melanogaster and Torpedo californica.
High-Performance, Solution-Processed, Embedded Multiscale Metallic Transparent Conductors
Oh, Yong Suk,Lee, Hyunwoo,Choi, Dong Yun,Lee, Sung-Uk,Kim, Hojin,Yoo, Seunghyup,Park, Inkyu,Sung, Hyung Jin American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.17
<P>High-performance multiscale metallic transparent conductors (TCs) are demonstrated by incorporating Ag nanowire (NW) networks into mictoscale Ag grid structures. Highly conductive Ag grids are fabricated via direct imprinting of an Ag ion ink using a reservoir-assisted mold. In this mold, a macroscale cavity) called the 'reservoir', is designed to connect to a grid-patterned cavity. The reservoir has a large cavity volume, which reduces unwanted residual layers within the grid spacings by introducing a thinner liquid film. The reservoir undergoes a large volume reduction during mold deformation, which improves ink filling within the grid patterned cavity through deformation-induced ink injection. The multiscale metallic TCs show a sheet resistance (R-s) of <1.5 Omega/sq and a transmittance (T) of 86% at 550 nm, superior to the corresponding values of Ag NW networks (R-s of 15.6 Omega/sq at a similar T). We estimate the R-s-T performances: of the Ag grids using geometrical calculations and demonstrate that their integration can enhance the opto-eleetrical properties of the Ag NW networks. Multiscale metallic TCs are successfully transferred and embedded into a transparent, flexible, and UV-curable polymer matrix. The embedded multiscale metallic TCs show reasonable electromechanical and chemical stability. The utility of these TCs is demonstrated by fabricating flexible organic solar cells.</P>
Platform for wireless pressure sensing with built-in battery and instant visualization
Cheong, Woon Hyung,Oh, Byungkook,Kim, Se-Hee,Jang, Jiuk,Ji, Sangyoon,Lee, Seunghee,Cheon, Jinwoo,Yoo, Seunghyup,Lee, Sang-Young,Park, Jang-Ung Elsevier 2019 Nano energy Vol.62 No.-
<P><B>Abstract</B></P> <P>Wireless communication through linkage with a smartphone and other portable devices in the sensor area are essential for increasing the efficiency of utilization by storing sensing-value data. Thus, the demand for wireless technology is increasing due to the advantages it provides for the various applications that use these data. However, there is still considerable ambiguity concerning the low portability of such technology due to the increased volume with component integration, the high consumption of power, and the necessity of having a separate battery. Herein, we present solutions for these problems with demonstrations that involve 1) the miniaturization of the device by altering the structure of the built-in battery, 2) the use of a pressure-activated switch for the low-power driving technology, and 3) the implementation of a wireless communication platform by integrating a Bluetooth module with the devices. In addition, we demonstrate a human-interactive display that enables users to instantly observe the changes in the brightness of the organic light-emitting diodes (OLED) as the pressure changes. We show that the system can display the measured, real-time pressure values on the screens of mobile devices, which represents a significant advancement in the fields of energy science and biomedical science.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Integrated system of portable pressure measuring device is developed. </LI> <LI> The built-in structure of the battery present high portability and the switch enables long-term operation. </LI> <LI> The device is capable of wireless communication with smartphones in real-time. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Young Hoon,Park, Sunghee,Oh, Jihun,Shin, Jong Won,Jung, Jaehoon,Yoo, Seunghyup,Lee, Min Hyung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.28
<P>A synthetic approach to highly efficient thermally activated delayed fluorescence (TADF) is proposed that uses ortho donor (D) acceptor (A) compounds (PXZoB, DPAoB, and CzoB), wherein the acceptor is based on triarylboron and the donor is phenoxazine (PXZ), diphenylamine (DPA), or carbazole (Cz). Combined with the ortho D-A connectivity, the bulky nature of the triarylboron endows the D-A dyads with inherent steric 'locking' for a highly twisteD-Arrangement, leading to a small energy difference between singlet and triplet excited states (Delta E-sT) and thus exhibiting very efficient TADF with microsecond-range lifetimes. In sharp contrast, the Corresponding para D-A derivatives, DPApB and CzpB, only display short-lived, normal fluorescence. Organic light-emitting diodes (OLEDs) incorporating the proposed ortho D-A compounds as emitters display orange, greenish-blue, and pure blue emission and exhibit high external quantum efficiency (eta(EQE)). In particular, the pure blue OLEDs based on the proposed ortho D-A emitters with a carbazole donor (CzoB) show a record-high eta(EQE) of 22.6% with CIE color coordinates of (0.139, 0.150), well illustrating the validity of the proposeD-Approach. Upon optical optimization, the eta(EQE) is further improved to 24.1%.</P>
Spontaneous Additive Nanopatterning from Solution Route Using Selective Wetting
Jeong, Hyeonho,Moon, Hanul,Kim, Han-Jung,Yoon, Min,Park, Chang-Goo,Oh, Yong Suk,Sung, Hyung Jin,Choi, Dae-Geun,Yoo, Seunghyup American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.31
<P>Nanopatterns of functional materials have successfully led innovations in a wide range of fields, but further exploration of their full potential has often been limited because of complex and cost-inefficient patterning processes. We here propose an additive nanopatterning process of functional materials from solution route using selective wetting phenomenon. The proposed process can produce nanopatterns as narrow as 150 nm with high yield over large area at ultrahigh process speed, that is, the speed of solution dragging, of up to ca. 4.6 m·min<SUP>-1</SUP>. The process is highly versatile that it can utilize a wide range of solution materials, control vertical structures including pattern thickness and multistacks, and produce nanopatterns on various substrates with emerging form factors such as foldability and disposability. The solution patterning in nanoscale by selective wetting is enabled by corresponding surface energy patterns in high contrast that are achieved by one-step imprinting onto hydrophobic/hydrophilic bilayers. The mechanisms and control parameters for the solution patterning are revealed by fluid-dynamic simulation. With the aforementioned advantages, we demonstrate 25 400 pixel-per-inch light-emitting pixel arrays and a plasmonic color filter of 10 cm × 10 cm area on a plastic substrate as potential applications.</P> [FIG OMISSION]</BR>