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Colloidal Silica와 Methyltrimethoxysilane간의 졸겔반응으로 합성된 코팅제 특성 연구
강동필,박효열,안명상,이태희,명인혜,강귀태 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.9
Hardness and surface property of coated gel materials are considerably different according to kinds(particle size/stabilized ion) of colloidal silica(CS), kinds of silanes, content ratio of silane versus CS, and reaction degree in sol solution. We report the properties of sol-gel coating materials in which the factors of reaction are kinds of CS, contents ratio of CS and MTMS, and reaction time of sol. The contact angles of the coated films obtained from the mixed CS system showed a little good relationship with MTMS content increase to those from HSA CS reaction system and the change of contact angle didn't have much effect on reaction time of sol. In the coating films obtained from HSA CS reaction system, the surface was much rough in case of that the content MTMS decreased and the reaction of sol kept long. The surface roughness of films obtained from the mixed CS reaction system showed similar tendency, though its degree was a little different. In synthesis of sol-gel coating materials, we could identify that choice of CS kinds and content ratio of CS and silane were important and it was desirable the reaction time of sol is not long.
Characteristics of Thin Films Synthesized from Colloidal Silica-Silane Sols
Myung, In Hye,Park, Hoy Yul,Na, Moon Kyong,Ahn, Myeng Sang,Kang, Dong Pil Taylor & Francis Inc. 2007 Molecular Crystals and Liquid Crystals Vol.463 No.1
<P> Three kinds of colloidal silica (CS)/silane sol solutions were synthesized by using three kinds of CS at different reaction time. Sol solutions were prepared from 1034A CS/methyltrimethoxysilane (MTMS), HSA CS/MTMS and LS CS/MTMS materials. In order to understand their physical and chemical properties, sol-gel coating films were fabricated on glass. Coating film on glass, obtained from 1034A/MTMS sol, had high contact angle and much enhanced flat surface in comparison with those of HSA/MTMS and LS/MTMS sols. Enhanced surface properties were observed in the case of sol solutions left for 7 days. With increasing reaction time in sol solutions, surface free energy and roughness in coating films decreased. Good thermal stability was observed in all used films, i.e., no thermal degradation up to 550°C. In the case of 1034A/MTMS coating film, thermal degradation did not occur up to 600°C. In addition, microhardness of 1034/MTMS coating film was higher than those of HSA/MTMS and LS/MTMS due to active networking and surface treatment reactions between 1034A and MTMS.</P>
Colloidal Silica가 Sol-Gel 하드 코팅 막의 광 변색 특성에 미치는 영향
신용탁 ( Yong Tak Shin ),이민지 ( Min Ji Lee ),조경숙 ( Kyung Sook Cho ),송기창 ( Ki Chang Song ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5
Organic-inorganic hybrid coating solutions were prepared starting from colloidal silica, lanthanum nitrate and γ-glycidoxypropyl trimethoxysilane by the sol-gel method. Also, spiropyran-doped hard coating solutions were prepared by mixing the spiropyran solution, obtained after dissolving spiropyran dye into tetrahydrofuran solvent, with the organic-inorgnic hybrid coating solutions. The spiropyran-doped hard coating solutions were applied as a thin layer to polycarbonate sheets, and their photochromic properties were investigated. The effect of amount of colloidal silica added into the coating solutions was investigated on the photochromic properties of coating films. Both decoloration rate and pencil hardness of the coating films were increased with increasing the amounts of colloidal silica.
Highly stable colloidal TiO<sub>2</sub> nanocrystals with strong violet-blue emission
Ghamsari, M.S.,Gaeeni, M.R.,Han, W.,Park, H.H. Elsevier [etc.] 2016 Journal of luminescence Vol.178 No.-
<P>Improved sol-gel method has been applied to prepare highly stable colloidal TiO2 nanocrystals. The synthesized titania nanocrystals exhibit strong emission in the violet-blue wavelength region. Very long evolution time was obtained by preventing the sol to gel conversion with reflux process. FTIR, XRD, UV-vis absorption, photoluminescence and high resolution transmission electron microscope (HRTEM) were used to study the optical properties, crystalline phase, morphology, shape and size of prepared TiO2 colloidal nanocrystals. HRTEM showed that the diameter of TiO2 colloidal nanocrystals is about 5 nm. Although the PL spectra show similar spectral features upon excitation wavelengths at 280, 300 and 350 nm, but their emission intensities are significantly different from each other. Photoluminescence quantum yield for TiO2 colloidal nanocrystals is estimated to be 49% with 280 nm excitation wavelength which is in agreement and better than reported before. Obtained results confirm that the prepared colloidal TiO2 sample has enough potential for optoelectronics applications. (C) 2016 Elsevier B.V. All rights reserved.</P>
Hwang, Kyung-Jun,Lee, Jae-Wook,Yoon, Ho-Sung,Jang, Hee-Dong,Kim, Jin-Geol,Yang, Jin-Suk,Yoo, Seung-Joon Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.10
A working electrode in dye-sensitized solar cells was fabricated using $TiO_2$ colloidal sol prepared from titanium isopropoxide used as a starting material by applying the sol-gel method. The effect of aging times and temperatures on physical and chemical properties of $TiO_2$ sol particles was systematically investigated. Results showed that the crystallinity and average particle size of $TiO_2$ colloidal sol can be successfully controlled by the adjustment of aging time and temperature. The conversion efficiency of the repetitive dry coating films fabricated using the dried $TiO_2$ colloidal sol particles and hydroxypropyl cellulose binder (15%) was 10.31% with a high transparency.
황경준,이재욱,윤호성,장희동,Jin Suk Yang,Jin-Geol Kim,유승준 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.10
A working electrode in dye-sensitized solar cells was fabricated using TiO2 colloidal sol prepared from titanium isopropoxide used as a starting material by applying the sol-gel method. The effect of aging times and temperatures on physical and chemical properties of TiO2 sol particles was systematically investigated. Results showed that the crystallinity and average particle size of TiO2 colloidal sol can be successfully controlled by the adjustment of aging time and temperature. The conversion efficiency of the repetitive dry coating films fabricated using the dried TiO2 colloidal sol particles and hydroxypropyl cellulose binder (15%) was 10.31% with a high transparency
Preparation anatase Ti-Li crystal composite colloidal solution
노홍채,유지수,오성근 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Anatase Ti-Li crystal colloidal solution was prepared by using sol-gel method and solvothermal process. It is transparent with color less (without solvothermal) and light blue color (with solvothermal), and has good dispersion stability. The size of particles are very small (under 5 nm) and have uniform scale. Properties of these colloidal solution characterized by (transmission electron microscope) TEM, X-ray diffraction (XRD), UV-vis spectroscopy, dynamic light scattering (DLS), and ultraviolet photoelectron spectroscopy (UPS).
Preparation of anatase TiO2 by low temperature annealing for inverted organic photovoltaic cells
노홍채,오성근 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
To prepare the anatase TiO2 thin films on ITO glass, amorphous TiO2 colloidal solution was synthesized through simple sol-gel method by using titanium (IV) isopropoxide as a precursor. The average particle size of amorphous TiO2 colloidal solution was about 1.0 nm and that of anatase TiO2 colloidal solution was 10 nm. The thickness of TiO2 films was ~15 nm for all cases. When inverted polymer solar cells were fabricated by using these TiO2 films as an electron transport layer, the device C showed the highest PCE (2.6 %) due to the lack of defect, uniformness and high light absorbance of TiO2 films. The result of this study can be applied for the preparation of inverted polymer solar cell using TiO2 films as a buffer layer at low temperature.
S. W. Han 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.S1
Polyamidimide (PAI)-colloidal silica (CS) nanohybrid films were synthesized by an advanced sol-gel process. The synthesized PAI-CS hybrid films have a uniform and stable chemical bonding and there is no interfacial defects observed by TEM. The thermal degradation ratio of PAI-CS (10 wt%) hybrid films is delayed by 100 ο C compared with pure PAI sample determined by on set temperature range in TGA. The dielectric constant of PAI-CS (10 wt%) hybrid films decreases with increasing CS content up to about 5 wt% but increases at higher CS content, which is not explained simply by effective medium therories (EMT). The duration time of PAI-CS (10 wt%) hybrid coil is 38 sec, which is very longer than that of pure PAI coil sample. The PAI-CS (10 wt%) hybrid film has a higher breakdown voltage resistance than the pure PAI film at surge environment and exhibits superior heat resistance. The PAI-CS (10 wt%) sample shows the advanced and stable thermal emission properties in transformer module compared with the pure PAI sample. This result illustrates that the advanced thermal conductivity and expansion properties of PAI-CS sample in the case of appropriate sol-gel processes brings the stable thermal emission in transformer system. Therefore, new PAI-CS hybrid samples with such stable thermal emission properties are expected to be used as a high functional coating application in ET, IT and electric power products.