• 접착 및 계면
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• 제24권3호
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• pp.105-111
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• 2023

최근 귀금속 산업을 포함한 다양한 산업 분야에 있어, 생물 부착 억제를 위한 코팅 방법에 대한 관심이 증가하고 있다. 특히, 패션 주얼리와 같이 피부에 밀착하여 접촉하는 악세사리나 귀걸이, 그리고 피어싱의 경우, 금속 표면의 오염으로 인하여 접촉 부위를 자극하거나 이상 반응을 유도할 수 있다. 이에 본 연구에서는 폴리에틸렌글라이콜 양 말단에 홍합의 접착 물질로 보고된 카테콜기를 도입하여 접착성 폴리에틸렌글라이콜을 합성하고, 이를 구리와 아연의 합금인 황동 표면에 코팅하여 생물 부착 억제 효과를 관찰하였다. 접착성 폴리에틸렌글라이콜이 코팅된 황동 표면은 우수한 세포 생존율을 나타낼 뿐 아니라, 단백질이나 세포의 부착을 억제하는 효과를 나타냈다. 그러므로 귀금속 산업 분야에 있어서 접착성 폴리에틸렌글라이콜을 이용한 다양한 응용이 기대된다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2005년도 춘계학술발표대회 논문집
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• pp.107-110
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• 2005

Tribological behaviors of carbon epoxy composites whose surfaces have many small grooves were compared with respect to coating method under dry sliding and water lubricating conditions. The surface coating materials were epoxy (Ep) and polyethylene (PE) mixed with self-lubricating $MoS_2$ and PTFE powders. The wear morphology of the composites observed with a scanning electron microscopic (SEM) revealed that the surface coating layer mixed with the self-lubricating powder on the grooved surface significantly improved the wear resistance under water lubricating condition because the surface coating layer blocked water to penetrate the composite surface and the self-lubricating powder reduced the wear on the coating by suppressing the generation of blisters.

• Journal of Industrial and Engineering Chemistry
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• 제67권
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• pp.187-198
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• 2018

Clay based coating with zwitterionic functionality is used to remove cationic and anionic dyes. Adsorbent coating was prepared by the mixing of bentonite clay, acrylic polymer (AP) and polyethylene-diamine (EPI-DMA). Characterization was performed using SEM-EDX, XRF, X-ray mapping and FTIR analyses. The adsorption capacity of ZACC was found to be increased from 59.35 to 255.99 mg/g and from 45.84 to 70.09 mg/g for BG and AR1 dyes, respectively using initial concentration (50-200 ppm). Significant adsorption capacity along with mechanical and chemical stability formulates ZACC as an excellent composite coating for treatment of anionic and cationic dyes from industrial wastewater.

• KSBB Journal
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• 제32권2호
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• pp.108-116
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• 2017

Omeprazole, a benzimidazole derivative, suppresses gastric acid secretion by inhibiting $H^+/K^+$ ATPase in gastric parietals cells, and by reducing $H^+$ concentration. To improve stability of esomeprazole magnesium dihydrate (ESMD), enteric-coated preperation was composed of core tablet, subcoating and enteric coating layer. We were evaluated in vitro dissolution characteristics between test and reference ESMD preparation and stability. We could prepare enteric-coated formulation of ESMD by controlling disintegrating agent and coating ratio which could rapidly dissolved in neutral or alkali medium. The formulation D5 with crospovidone of 1.25% and coating ratio of 16.25% had a similar dissolution behavior compare to reference preparation. Difference factor ($f_1$) and similarity factor ($f_2$) were 0~15 and 50~100 and there was no significant difference in bioequivalence between formulations. The content and dissolution rate of formulation D5 were $96.54{\pm}0.21$ and $78.56{\pm}0.87%$ without change of color in accelerated condition ($40^{\circ}C$, RH 75%, high density polyethylene (HDPE) container) for 6 months. This study concluded that our enteric coated preparation of ESMD could be an useful method to improve stability of unstable drug without direct contact with coating material.

• 한국기계가공학회지
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• 제18권12호
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• pp.45-51
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• 2019

As the separator becomes thinner, the role of thermal stability becomes more important in ensuring the high capacity of medium- and large-sized lithium-ion secondary batteries. In this study, we researched coating technology to improve the separator's thermal stability. We minimized the coating time by optimizing the design of a vertical two-stage coater that was thin, uniform, and capable of coating on both sides at the same time with a maximum 2㎛ thickness coating layer of fluorinated polymer (PVdF-HFP) on the bare polyethylene (PE) separator, which increased the thermal stability. In addition, during the coating process, a dual-jacket-roll method of drying was developed that increased the drying effectiveness without thermal damage to the separator. We also investigated the thermal stability of the separator manufactured from a coating machine, and studied the battery-applied performance by making a lithium-ion pouch battery.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2001년도 추계산학기술 심포지엄 및 학술대회 발표논문집
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• pp.91-94
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• 2001

리튬전지의 vent cap ass'y용의 AI foil에 LDPE(low density polyethylene)만을 coating하였으나 LDPE는 vent cover인 sus와의 열접착성이 우수하지 못하기 때문에 vent 조립시 상당한 주의가 필요했다. 그러나, LDPE보다 열접착성이 우수한 EVA(ethylene vinylacetate)와 EAA(ethylene acrylic acid)의 2중 coating된 AI foil을 이용함으로 열접착성을 향상시킬 수 있었다. 이에 따라, 전해액 누액 등의 전지 불량 원인을 제거함과 동시에 vent cap ass'y의 조립시 공정 불량까지 감소시킬 수 있었다.

• International Journal of Precision Engineering and Manufacturing
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• 제9권1호
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• pp.51-53
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• 2008

A new nano-particle deposition system (NPDS) was developed for a ceramic and metal coating process. Nano- and micro-sized powders were sprayed through a supersonic nozzle at room temperature and low vacuum conditions to create ceramic and metal thin films on metal and polymer substrates without thermal damage. Ceramic titanium dioxide ($TiO_2$) powder was deposited on polyethylene terephthalate substrates and metal tin (Sn) powder was deposited on SUS substrates. Deposition images were obtained and the resulting chemical composition was measured using X-ray photoelectron spectroscopy. The test results demonstrated that the new NPDS provides a noble coating method for ceramic and metal materials.

• 동력기계공학회지
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• 제8권4호
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• pp.38-43
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• 2004

Thermal spraying onto the metal substrate has been widely used as a technique of the surface treatment in the various industrial field. A wide range of thermal spray technologies exist and all rely on the fundamental process of fusing a metal feedstock, atomizing it and transporting it to the surface of a substrate. Specially, these methods have been taken into account as the protection method against the corrosion. In this study, the polarization characteristics were carried out on the thermal sprayed coating layer immersed in various pH of diluted aqueous solutions at $25^{\circ}C$. Aluminum, Zinc, Ni-base alloy, alumina and polyethylene powder were used with sprayed coating materials. From the polarization curves, the electrochemical corrosion potential($E_{corr}$) and the corrosion current density($I_{corr}$) were investigated.

• 반도체디스플레이기술학회지
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• 제18권3호
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• pp.36-41
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• 2019

Hybrid-type transparent electrodes were fabricated by depositing carbon nanotubes (CNTs) via spray coating on polyethylene terephthalate (PET) substrates and then coating the CNTs with [poly(3,4-ethylenedioxythiophene)] (PEDOT) films via electro-polymerization. For all of the fabricated electrodes, their surface morphologies, electric sheet resistances, visible transmittances, and color properties (e.g., yellowness) were characterized as functions of the applied voltages and process times used in electro-polymerization. The sheet resistance of the CNTs was significantly reduced by the coating of PEDOT, while their visible transmittances slightly decreased. The yellowness values of the PEDOT-coated CNTs were observed to have substantially decreased via electro-polymerization. The experimental results confirmed that the fabricated hybrid electrodes had desirable properties for the application of transparent electrode in terms of the electrical resistance, optical transmittance, and chromaticity.

• 대한화학회지
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• 제13권4호
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• pp.379-386
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• 1969

Polyethylene maleate (PEM) and epoxy resin cinnamate (BEC) were prepared to investigate their photosensitivity. Various samples coated on glass plate were exposed to light under various conditions and steeped in the same solvent as used for coating, and then the yield of residual film (W/$W_0$) was calculated. The yield (W/$W_0$), which was closely related to the sensitivity of the film, was affected by the degree of polymerization of the film, light source, sensitizers land their concentration. In polymer homologs, the sensitivity depended upon degree of polymerization. Most effective sensitizers for PEM and BEC among those used here were benzanthrone and 2,6-dichloro-4-nitroaniline.