• Title/Summary/Keyword: 코팅막

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Ce:YAG remote phosphor coating for white LED with silica sol binder (Silica sol 바인더를 적용한 백색 LED용 Ce:YAG remote 형광체 코팅)

  • Gim, Su Jin;Park, Ha Na;Choi, Jae Ho;Jung, Yoon Sung;Kim, Hyeong-Jun
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.31 no.5
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    • pp.212-217
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    • 2021
  • The applicability of the white LED from the blue LED of the coating film as a binder for surface and curved coatings were confirmed. The particle size of YAG is D50: 9~10 ㎛, and the crystal structure is garnet (Y3Al5O12), cubic. The coating film had no cracks, at the same time, the silica sol was uniformly coated with YAG phosphor, and the YAG content and thickness in the coating film showed a tendency to increase up to 40 ㎛ in proportion to the increase in the amount added. Furthermore, as the YAG content increased, the PL emission intensity increased and the color coordinate shift toward the end of the chromatic locus curve was confirmed.

Effect of Support Resistance & Coating Thickness on Ethylene/Nitrogen Separation of PDMS Composite Membranes (지지체 투과저항과 코팅층의 두께가 PDMS 복합막의 에틸렌/질소의 투과성능에 미치는 영향)

  • 김정훈;최승학;박인준;이수복;강득주
    • Membrane Journal
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    • v.14 no.1
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    • pp.57-65
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    • 2004
  • The effect of porous support layer resistance and PDMS (polydimethylsiloxane) coating thickness on ethylene/nitrogen separation of composite membranes was studied with the model of Pinnau and Wijmans〔1〕. To control the support resistance (or permeance), PES porous membranes were prepared by phase inversion process with various PES/NMP dope concentrations. The thickness of selective PDMS top layer was controlled by using a spin coater. Its cross-section and coating thickness were observed by scanning electron microscope (SEM). Pure gas permeation test was done with ethylene and nitrogen, respectively. The experimental result for olefin/nitrogen separation process matched well with theoretical result from the model used. The result shows that optimization between PDMS coating thickness and support resistance is important to get PDMS composite membranes with best performance.

Preparation and Performance of Composite Membrane Prepared by Layer-by-Layer Coating Method (Layer-by-Layer 코팅법을 적용한 복합막 제조와 투과성능 평가)

  • Jeon, Yi Seul;Rhim, Ji Won
    • Membrane Journal
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    • v.25 no.6
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    • pp.538-546
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    • 2015
  • In this study, composite membrane is prepared by Layer-by-Layer method using hydrophobic polymer as a coating material on the polysulfone support. The existence of coating layer on the surface and cross section was confirmed by the scanning electronic microscopy. The flux and rejection of the resulting membranes were characterized using 100 ppm NaCl feed solution. PVSA, PEI, PAA, PSSA, PSSA_MA were used as a coating polymer in this study. The composite membrane prepared by using 8,000 ppm PAA solution (Ion strength = 0.35, Coating time = 3 min) and 10,000 ppm PEI solution (Coating time = 4 min). As a result, PAA-PEI composite membrane showed flux of 101 LMH and salt rejection of 66.7%. The composite membrane showed the comparable performance as good as NE 4040-70 (Flux = 30 LMH, Rejection = 40~70%) model produced by Toray Chemical co.

A Study on the Improvement of the Thermal Stability of PE Separator for Lithium Secondary Battery Application Using Poly(meta-phenylene isophthalamide) (Poly(meta-phenylene isophthalamide)를 이용한 리튬이차전지용 PE 분리막의 고내열화 연구)

  • Park, Mina;Ra, Byung Ho;Bae, Jin-Young;Kim, Byung-Hyun;Choi, Won-Kun
    • Polymer(Korea)
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    • v.37 no.1
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    • pp.22-27
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    • 2013
  • In this study, we prepared separators with improved thermal stability by coating microporous polyethylene (PE) film for lithium secondary battery using poly(meta-phenylene isophthalamide) (Nomex). The mechanical and thermal properties of prepared separators were evaluated by thermal stability test and TMA as a function of the Nomex concentration and coating parameters. The corresponding coated PE separator showed better thermal and mechanical properties than the original PE separator. Electrochemical properties were also assessed by ionic conductivity, cyclic voltammetry and charge/discharge cycle.

Photochromic Properties of Spiropyran in Hard Coating Films Made by Sol-Gel Method (Sol-Gel 하드 코팅 막에서의 Spiropyran의 광 변색 특성)

  • Jeong, Sang Hyeok;Cho, Kyung In;Park, Jeong Yong;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.46 no.2
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    • pp.310-315
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    • 2008
  • Organic-inorganic hybrid solutions were made using glycidoxypropyl trimethoxysilane (GPTMS) and vinyltriethoxysilane (VTES) as starting materials by sol-gel method. Photochromic coating solutions were prepared by mixing the solution of photochromic dye (spiropyran) dissolved in ethylacetate with the organic-inorganic hybrid solutions. Photochromic films were prepared on polycarbonate sheets by spin coating and cured for 2 h at $100^{\circ}C$. The resulting films exhibited a reversible color change upon irradiation with UV light from transparent to blue. The color-fading speed and pencil hardness of the coating films increased with increasing the GPTMS content in the coating solutions.

Preparation of Photochromic Coating Films Containing Spiropyran by Sol-Gel Method (Sol-Gel법에 의해 Spiropyran을 함유한 광 변색 코팅 막의 제조)

  • Jeong, Sang Hyeok;Cho, Kyung In;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.46 no.1
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    • pp.112-117
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    • 2008
  • Organic-inorganic hybrid solutions were prepared via sol-gel method using glycidoxypropyl trimethoxysilane (GPTMS) and methyl triethoxysilane (MTES) as starting precursors at a molar ratio of 1:1. The photochromic coating solutions were prepared by mixing the solutions of photochromic dye (spiropyran) dissolved in ethylacetate (EA) with the organic-inorganic hybrid solutions. Photochromic films were prepared on polycarbonate substrate by spin coating and cured for 2 h at $100^{\circ}C$. The resulting films exhibited a reversible color change upon irradiation with UV light. The photochromic properties of the films showed that the color-fading speed increases with increasing the EA content in the coating solutions.

Properties of Silicon Coated Fabric for Membrane Treated by Low Temperature Plasma (저온플라즈마 처리에 의한 실리콘코팅 막구조 원단의 특성변화)

  • Park, Beob;Lee, Jang-Hun;Koo, Kang
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2011.03a
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    • pp.60-60
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    • 2011
  • 막구조는 근래에 와서 대공간 구조 및 지붕구조에 가장 보편적으로 사용되는 경량 인장 구조물로 각광받고 있다. 구조용 막재는 풍하중 및 설하중에 충분히 감당할 수 있도록 강도와 내구성을 가지고 있어야 한다. 일반적으로 막구조 재는 PVC코팅 폴리에스터막, 실리콘코팅 유리섬유막, PTFE코팅 유리섬유막이 있다. 제직되는 원단의 크기가 한정되어 있기 때문에 재단 후 접착하여 제작한다. 이 때문에 이음부분이 나 재단부분에 코팅으로 인한 접착이 어려워 고온고압으로 접착을 한다. 이 연구에서는 실리콘코팅 유리섬유막의 접착시 어려움을 보완하기 위해 저온 Plasma를 이용한 처리법으로 방전에 의해 Plasma를 발생시켜 50w, 100w 출력으로 10분, 20분간 처리하여 그 결과를 접촉각과 SEM 관찰을 통해 표면처리를 관찰하였다. Plasma 처리로 인해 실리콘 표면층에 균열이 발생하고 표면이 갈라짐을 확인할 수 있었다. 접촉각측정 결과 Plasma 출력과 시간의 증가함에 따라 접촉각은 감소하였다. 실리콘코팅 원단에 저온 Plasma 처리한 후 표면 특성을 분석하고 원단을 접착을 시켜 박리 강도를 측정함으로써 막구조 원단의 접착력 향상에 대한 연구를 진행하였다. KS K 0533 접착포의 박리 강도 시험방법으로 실리콘코팅 원단의 박리 강도를 측정한 결과 플라즈마 처리 원단이 플라즈마 미처리 원단보다 박리 강도가 향상된 것을 확인할 수 있었다. 저온 Plasma 처리 시간이 증가할수록 표면의 젖음성을 향상시켜 접촉각을 낮추었다. 이는 곧 표면에너지의 증가를 뜻하는 것으로 접착력을 증가시켜 실리콘코팅 원단의 접착성을 시킴으로써 강한 강도와 내구성을 갖춘 막구조물의 개발에 기대되고 있다.

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Separator Properties of Silk-Woven Fabrics Coated with PVdF-HFP and Silica and the Charge-Discharge Characteristics of Lithium-ion Batteries Adopting Them (PVdF-HFP와 실리카가 코팅된 실크 견직물의 분리막 특성과 이를 채용한 리튬이온전지의 충방전 특성)

  • Oh, Seem Geon;Lee, Young-Gi;Kim, Kwang Man;Lee, Yong Min;Kim, Sang Hern;Kim, Yong Joo;Ko, Jang Myoun
    • Korean Chemical Engineering Research
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    • v.51 no.3
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    • pp.330-334
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    • 2013
  • Mixtures of poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) and silica nanoparticles are coated on the surface of a silk fabrics separator. The coated separators are finally prepared by injecting an electrolyte solution and then characterized for use of lithium-ion battery separator/electrolyte. In the preparation, various contents of dibutylphthalate (DBP) as a plasticizer are used to enhance the formation of micropores within the coated membrane. The coated silk fabrics separators are characterized in terms of ionic conductivity, drenching rate, and electrochemical stability, and the charge-discharge profiles of lithium-ion batteries adopting the coated separators are also examined. As a result, the coated silk fabrics separator prepared using DBP 40~50 wt% and silica shows the superior separator properties and high-rate capability. This is due to (i) high sustainability of silk fabrics, (ii) the formation of micropores with the coated layer membrane by DBP, (iii) increase in drenching rate by silica nanoparticles to involve great enhancements in specific surface area and ionic conductivity.

Hydrophilic Coating and Characterization of PVDF Membrane with Flower Type Cross-section made from Thermally Induced Phase Separation (열유도 상분리로 제조한 플라워 형태 단면을 갖는 PVDF 분리막의 친수성 코팅 및 특성평가)

  • Im, Kwang Seop;Lee, Jeong Woo;Jang, Jae Young;Nam, Sang Yong
    • Membrane Journal
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    • v.29 no.6
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    • pp.362-376
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    • 2019
  • In this study, hydrophilic coating characteristics of PVDF [poly(vinylidene fluoride)] hollow fiber membranes with flower type cross-section prepared by thermally induced phase separation were studied. The hollow fiber used in this study was provided from PureEnvitech Co. Ltd., and the hydrophilic coating experiment was performed with different concentration and number of coating of PEBAX 1657, 2533 and 3533 block copolymer solution using a dip coating method. The hydrophilic coated hollow fiber membrane was characterized to scanning microscope and contact angle measurements to determine the degree of hydrophilization. As a result of SEM characterization, it was confirmed that the thickness of the coating layer increased as the coating concentration increased and the number of coatings increased. Contact angle of surface of hollow fibers decreased as the concentration of the coating solution increased and the number of coatings increased. Gas permeance of oxygen gas was measured for the application of the hydrophilized hollow fiber to Membrane Areated Biofilm Reactor. As a result of gas permeation test, it was confirmed that gas permeance decreased with increasing coating concentration and number of coatings, and the more hydrophilized hollow fiber coated with PEBAX 1657 showed lower gas permeance than those coated with PEBAX 2533 and 3533.

A Study on Properties of Hydrogenated a-C and a-CN thin films Prepared by Plasma Chemical Vapor Deposition (PCVD법에 의한 a-C:H 및 a-CN:H 박막의 특성 평가에 관한 연구)

  • Kim, Dae-Uk;Lee, Gyeong-Hwang;Park, Jong-Won;Park, Gwang-Su
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2011.05a
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    • pp.110-111
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    • 2011
  • 비정질 탄소계 박막은 높은 경도, 내마모성, 내화학성 및 전기저항특성을 갖는 박막으로 다양한 산업분야에 응용 및 적용 연구가 진행되고 있다. 특히, 탄소계 박막은 자동차 및 기계 산업분야에 있어서 우수한 물리적 특성인 고경도 및 저마찰 특성을 이용한 금속 표면의 기능성 부여를 목적으로 활발하게 연구가 이루어지고 있다. 본 연구는 사출금형 표면의 고경도 저마찰화를 목적으로 비정질 탄소계 박막을 사출금형 소재 (KP4)에 제작하고, 이들 코팅막에 대한 경도, 밀착력, 마찰계수 등의 물리적 특성을 평가하였다. 또한, 탄소계 코팅막 제작 공정 조건이 코팅막의 물리적 특성에 미치는 영향에 대하여 고찰하였다.

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