• 한국염색가공학회지
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• 제35권4호
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• pp.196-205
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• 2023

Water-dispersed pigment is on-going study for without air pollution in the textile and print industry. Primer treatment is essential for the substrate to improve the printing quality of eco-friendly water-dispersed pigment ink. Otherwise in the case of untreated primer, the water-dispersed pigment ink will dry onto the surface and cause defective images. This study was conducted on film substrate coating (primer) to fix eco-friendly water-dispersed pigment ink on film substrate. The drying, bleeding, and color strength of the pigment ink were examined depending on the composition and mixing ratio of the coating solution. The mixing ratio of silica gel in the coating film is increased to 0, 0.5, 1, 2 and 3 and results that DK-1-3 of silica gel ratio of 1 showed the lowest bleeding such as 52%, the letter thickness of 0.76mm and DK-1-5 of SG ratio of 3 showed the highest bleeding such as 304%, the letter thickness of 2.02mm. The mixing ratio of SPA in the coating film is increased to 2.5, 5, 7.5, SPA ratio of 7.5 has a bleeding ratio of 9% and letter thickness of 0.544mm. It showed the closest value to 0.5mm. According to the result, the optimal mixing ratio of binder, polymer coagulant, silica gel is 100:7.5:1.

• 반도체디스플레이기술학회지
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• 제13권3호
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• pp.51-55
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• 2014

Ni-CNT(Carbon Nanotubes) composite coating is often used for the surface treatment of mechanical/electronic devices to improve the properties of the Ni coating. For the Ni-CNT coating, the dispersion of CNT fibers is a critical process. In this study, ultrasonic treatment instead of the conventional ball milling was attempted as a dispersion method for the electroless Ni-CNT coating. SEM-EDX analysis was performed and contact angle, sheet resistance, and micro-hardness were measured. Results showed that the ultrasonic treatment was comparable to the ball milling, as a dispersion method, but the difference was negligible. However, combined ball milling and ultrasonic treatment(double treatment) showed much improved micro-hardness value, above 350Hv(close to the value obtained by the Ni-CNT electroplating). In addition, electroless Ni-CNT(double-treated) coatings formed on the thin Ni film deposited by the electroless plating(double coating) showed better mechanical properties. Thus, double treatment and double coating are suggested as an improved electroless Ni-CNT coating method.

• 한국세라믹학회지
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• 제34권2호
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• pp.188-194
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• 1997

TMCS(Trimethylchlorosilane)로 표면개질한 습윤겔을 에탄올에 재분산시켜 코팅용 재분산 실리카 졸을 제조하였고 제조된 졸을 실리콘 기판에 스핀 코팅한 후 상압 하에서 건조(8$0^{\circ}C$) 및 열처리(>25$0^{\circ}C$)하여 열처리온도에 따른 박막의 물성 변화를 관찰하였다. 습윤겔의 재분산시 안정한 재분산 실리카 졸의 제조를 위한 최적 재분산 조건을 습윤겔:에탄올=1g110$m\ell$로 하였고, 이렇게 제조된 재분산 실리카 졸의 농도와 점도는 각각 0.11 M, 2.0-2.2cP였으며 평균 졸 입자크기는 약 30nm정도였다. 1500rpm, 10회 스핀 코팅한 후 8$0^{\circ}C$에서 2시간 건조, 45$0^{\circ}C$에서 2시간 열처리에 의하여 굴절율이 약 1.14, 두께가 400nm정도인 균열이 없는 박막을 얻을 수 있었다.

• 한국전기전자재료학회논문지
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• 제25권7호
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• pp.531-536
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• 2012

We herein present results of flat and uniform polymer-blended small molecular semiconductor thin films. Which were produced for organic thin film transistors (OTFTs), using a simple pre-metered horizontal dipping process. The organic semiconducting thin films were composed of 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-PEN) composite blended with a polymer binder of poly(${\alpha}$-methylstyrene) (PaMS). We show that the pre-metered horizontal-dip-coating(H-dip-coating) process allowed the critical control of the thickness of the blended TIPS-PEN:PaMs thin film. The fabricated OTFTs using the TIPS-PEN:PaMs films exhibited maximum field-effect mobility of $0.22\;cm^2\;V^{-1}\;s^{-1}$. These results demonstrated that H-dip-coated TIPS-PEN:PaMS films show considerable promise for the production of reliable, reproducible, and high-performance OTFTs.

• Applied Biological Chemistry
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• 제29권3호
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• pp.241-247
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• 1986

쌀밥 품질의 영향 요인을 규명하기 위하여 밥 짓기 과정중 밥과 밥물의 상호 관계를 분석하고, 저급의 장립종 밀양 23호의 밥맛 증진의 수단으로 새로운 밥짓기 방법을 제시하였다. 밥짓기 과정중 밥과 밥물의 높이 변화를 측정하였다. 끊는점 부근에서 밥물이 급격히 감소하고, 이어서 농축된 밥물이 밥알 표면에 엷은 피막층을 형성함을 관찰할 수 있었다. 피막 보강 물질로 찹쌀분 1,2%(W/W)를 첨가 한 후 밥짓기를 향한 결과, 피막이 크게 보강되었으며 이렇게 제조된 밥은 윤기와 외관이 향상되고 수분 함량이 증가하였으며 밥짓기중 가용성 쌀 고용분 함량의 용출을 감소시킬 수 있었다. 밥알 피막의 형성은 밥짓기의 최종단계에서 밥알의 진동과 밥물의 고형분 농도와 유관함을 보였고, 밥의 음질 결정의 중요 요소로 작용할 수 있음을 제안하였다.

• 공업화학
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• 제22권1호
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• pp.81-86
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• 2011

자기 조립성 염료인 Sunset Yellow-FCF 수용액은 상온에서 농도 25 wt%부터 schlieren 구조의 액정상을 보이기 시작하여, 28 wt% 이상이면 완전한 네마틱 액정상으로 관찰되었다. 전단배향에 의한 코팅으로 광학적 이방성 필름을 제조하기 위해서는 30 wt% 이상의 농도가 필요하였다. 액정 색소의 농도, 코팅속도, 건조 온도, 상대습도 등 코팅 변수가 최종 박막필름의 두께, 투과도에 미치는 영향 분석에 의하면, 최종 필름의 두께에는 용액의 농도가 가장 큰 영향을 주었으며, 평행방향의 투과도에는 건조 온도와 농도의 영향이 가장 컸다. 특히 Sunset Yellow-FCF의 농도 증가로 전단코팅에 의한 배향성이 개선되고 높은 편광도를 갖는 필름제조가 가능하였다. 본 실험에서는 33 wt%의 Sunset Yellow-FCF 수용액을 사용하면, 89.7~98.7%의 편광도를 갖는 광학적 이방성 필름이 제조되었다.

• 한국재료학회지
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• 제24권12호
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• pp.689-693
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• 2014

Anti-reflection coating films have used to increase the transmittance of displays and enhance the efficiency of solar cells. Hydrophobic anti-reflection coating films were fabricated on a glass substrate by sol-gel method. To fabricate an anti-reflection film with a high transmittance, poly ethylene glycol (PEG) was added to tetraethyl orthosilicate (TEOS) solution. The content of PEG was changed from 1 to 4 wt% in order to control the morphology, thickness, and refractive index of the $SiO_2$ thin films. The reflectance and transmittance of both sides of the coated thin film fabricated with PEG 4 wt% solution were 0.3% and 99.4% at 500 nm wavelength. The refractive index and thickness of the thin film were n = 1.29 and d = 105 nm. Fluoro alkyl silane (FAS) was used for hydrophobic treatment on the surface of the anti-reflection thin film. The contact angle was increased from $13.2^{\circ}$ to $113.7^{\circ}$ after hydrophobic treatment.

• 한국결정성장학회지
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• 제26권6호
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• pp.220-224
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• 2016

초음파 스프레이를 이용하여 유리기판 위에 반사방지 박막이 제조되었다. GPTMS와 TEOS는 솔-젤 하이브리드 코팅 용액을 제조하기 위하여 사용되었다. 반사방지막의 코팅 두께를 제어하기 위하여 스프레이 노즐의 이동속도는 15~25 mm/s로 변경되었다. 스프레이 노즐의 이동속도가 증가 됨에 따라 반사방지막의 두께는 138 nm에서 86 nm로 감소되었다. 20 mm/s의 노즐 이동속도에 의해 제조된 반사방지막의 굴절률은 약 1.31, 막의 두께는 104 nm이며, 380 nm에서 780 nm의 가시광 영역에서의 평균 반사율은 0.75 %, 투과율은 94 %로 측정되었다.

• 한국세라믹학회지
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• 제32권1호
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• pp.95-105
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• 1995

Ceria(CeO2) stabilized zirconia(CeSZ) sol was synthesized with zirconium n-butoxide Zr(OC4H9)4 and cerium nitrate hexahydrate Ce(NO3)3.6H2O as precursors and ethylacetoacetate(EAcAc) as a chelating agent under atmosphere. CeSZ films were deposited on AISI 304 stainless steel using the prepared polymeric sol by dipcoating and the coating characteristics were investigated by XRD, ellipsometry, scratch test and SEM. The CeSZ film began to crystallize from amorphous to tetragonal phase at 40$0^{\circ}C$ and it was not converted into monoclinic phase up to 100$0^{\circ}C$ by the addition of 16mol% CeO2 as a stabilizer which could suppress phase transformation of zirconia. The CeSZ films were prepared by varying the EAcAc contents and the cncentration of CeSZ sol and measured the thickness and refractive index. From these results, it was found that the EAcAc contents and concentration of CeSZ coating sol evidently affect the densification of CeSZ film. The CeSZ film coated with 0.4M CeSZ sol and heat-treated at $600^{\circ}C$ for 10min had thickness of 50nm and 17% porosity. The CeSZ film on 304 stainless steel effectively acted as a protective layer against oxidation up to 80$0^{\circ}C$ and had superior corrosion resistance in 25% H2SO4 solution for 4.5 hrs.

• 한국표면공학회지
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• 제42권3호
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• pp.109-115
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• 2009

Magnesium is one of the lightest metals, and magnesium alloys have excellent physical and mechanical properties such as high stiffness/weight ratios, good castability, good vibration and shock absorption. However their poor corrosion resistance, wear resistance, hardness and so on, have limited their application. To improve these defects, many techniques are developed. Micro arc oxidation(MAO) is a one of the surface treatments under anodic oxidation in which ceramic coating is directly formed on the surface of magnesium alloy. In this study, the characteristics of anodic film were examined after coating the AZ31B magnesium alloy through the MAO process. MAO was carried out in potassium hydroxide, potassium fluoride, and various concentration of sodium silicate in electrolyte. The morphology and chemical composition of the coating layer were characterized by SEM, XRD, EPMA and EDS. The hardness of anodic films was measured by micro-vickers hardness tester. As a result, the morphology and composition of anodic film were changed by concentration of sodium silicate. Thickness and Si composition of anodic film was increased with increasing concentration of sodium silicate in electrolyte. The hardness of anodic film was highly increased when the concentration of sodium silicate was above 40 g/l in electrolyte.