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Minwook Kim,Mingyu Kim,Kwangjun Kim,Yongju Lee,Minyong Park,Byeol Han,Hyunchan Noh,Sangwon Hwang,Sang Hoon Lee,Jong G. Ok 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.5
We develop a solution-processable, Ag-sandwiched carbon-nanotube-coated, durable (SAND) architecture that enables power-efficient and highly consistent cyclic heating up to 400 °C at 6 V with neither structural degradation nor substrate breakage. The Ag/CNT/Ag-stacked SAND structure, comprising an airbrushed carbon nanotube (CNT) network layer sandwiched by the Ag layers reduced with ionic Ag ink coatings, can be created by a facile and scalable all-solution-processable fabrication protocol without resorting to vacuum-assisted nanofabrication. Through a systematic comparison with Ag-only and CNT/Ag- or Ag/CNT-bilayered structures, we show that the SAND architecture can improve the joule-heating efficiency and uniformity, and more importantly, the anti-breaking durability to overcome the thermal expansion discrepancy against the underlying substrate. This is analytically interpreted through a thermal stress-induced substrate breaking mechanism, where the increasing difference in the thermal expansion between the substrate and coated layers upon heating can be effectively suppressed within the SAND architecture. Readily applicable to more scalable, diverse substrates ranging from brittle glass to large-area polymer films, the SAND architecture can be utilized in the flexible and reliable anti-failure heating devices required in such applications as machine and vehicle components, sensor systems, and safety and warm-up gears.
금속이온 잉크와 탄소나노튜브 용액의 에어브러싱 적층 기반 고성능 고내구성 박막형 히팅 모듈의 수월 제작 기술
김민욱(Minwook Kim),김민규(Mingyu Kim),김광준(Kwangjun Kim),박재원(Jaewon Park),이민영(Minyoung Lee),최현식(Hyunsik Choi),박종갑(Jonggab Park),노현찬(Hyeonchan Noh),윤부현(Boohyeon Youn),정은창(Eunchang Jeong),최광진(Kwangjin Choi),허 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.7
Kim, Dae-Yoon,Park, Minwook,Lee, Sang-A,Kim, Soeun,Hsu, Chih-Hao,Kim, Namil,Kuo, Shiao-Wei,Yoon, Tae-Ho,Jeong, Kwang-Un The Royal Society of Chemistry 2015 SOFT MATTER Vol.11 No.1
<P>Unconventional star-shaped liquid crystals (abbreviated as SiLCs) were successfully synthesized by chemically connecting four cyanobiphenyl anisotropic mesogens to the periphery of a super-hydrophobic and ultra-flexible cyclic tetramethyltetrasiloxane ring with flexible hexyl chains. Based on the combined experimental techniques of differential scanning calorimetry (DSC), cross-polarized optical microscopy (POM), solid-state carbon-13 (<SUP>13</SUP>C) nuclear magnetic resonance (NMR) spectroscopy and one-dimensional (1D) wide-angle X-ray diffraction (WAXD), it was found that the SiLC molecule exhibited the monotropic phase transition from a LC phase to a crystalline phase. The crystalline phase was only detected during slow heating processes above its glass transition temperature, while a LC phase was formed both during cooling and during heating processes. The hierarchical superstructures were identified from the structure-sensitive 2D WAXD of the macroscopically oriented SiLC film and confirmed by selected area electron diffraction (SAED) of the SiLC single crystals. The molecular packing symmetry in the monoclinic unit cell was further investigated by computer simulations on the real and reciprocal spaces. Macroscopically oriented SiLC hierarchical superstructures on the different length scales may provide the targeted physical properties, which can allow us to apply SiLC molecules in the fields of electro-optical devices and nonlinear optics.</P> <P>Graphic Abstract</P><P>A star-shaped molecule synthesized by connecting four cyanobiphenyl mesogens to the periphery of a super-hydrophobic and ultra-flexible cyclic siloxane ring with hexyl chains formed hierarchical layered superstructures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4sm02239d'> </P>
Minwook Yoo,Sung-Chul Jin,김승환,최병삼,Hae Yu Kim,SungJun Lee,Sung Tae Kim,정해웅 대한뇌혈관외과학회 2016 Journal of Cerebrovascular and Endovascular Neuros Vol.18 No.4
Objective:Excelsior XT-27 (Stryker Neurovascular, Fremont, CA, USA) or Rebar 27 (eV3 Covidien, Irvine, CA, USA) microcatheters have recently been used to overcome the limitations of the Renegade Hi-Flo microcatheter such as interference between two microcatheters (one for stent delivery and the other for cerebral aneurysm coiling) during the jailing technique. We evaluated differences and influential factors related to the interference phenomenon according to these two microcatheters group. Materials and Methods:Between June 2011 and September 2013, the jailing technique was applied to 94 internal cerebral artery (ICA) aneurysms. The jailing technique with the Neuroform EZ stent system was performed using Renegade (n = 22), Rebar (n = 35), and XT-27 microcatheters (n = 37). In the Renegade Hi-Flo microcatheter group, the jailing technique was successful in 19/22 patients (86.4%) and interference between the two microcatheters occurred in 6/21 patients (28.6%). In the Rebar and XT-27 microcatheter group, the jailing technique was successful in 71/72 patients (98.6%) and interference between the two microcatheters occurred in 1/72 patients (1.4%). Results:There was a significant difference in the interference between the two delivered microcatheters group (p-value < 0.000) and the carotid siphon angle (p-value: 0.004) in the univariate analysis. In the multiple logistic regression analysis, the Rebar and XT-27 microcatheter group (odds ratio [OD] [95% confidence interval (CI)]; 31.277 [3.138-311.729], p-value: 0.003) and the carotid siphon angle (OD [95%CI]; 0.959 [0.922-0.997], p-value: 0.035) were found to be influential factors in the interference phenomenon. Conclusion: The Rebar 27 and XT-27 microcatheters were more successful and exhibited less interference between the two microcatheters than the Renegade Hi-Flo microcatheter.