• Title/Summary/Keyword: Sol-gel hybrid

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Preparation and application of gel type polymer electrolyte for PEFC (PEFC 연료전지용 겔 타입 고분자 전해질 합성 및 응용)

  • Lee, Sang-Yong;You, Ji-Yeon;Kim, Han-Joo;Oh, Mee-Hye;Park, Soo-Gil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.11a
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    • pp.42-45
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    • 2003
  • Inorganic polymer based hybrid membranes consisting of zirconium oxide and polydimethylsiloxane (PDMS) have been synthesized by sol-gel processes. The hybrid membranes showed thermal stability and flexibility up to $300^{\circ}C$. The membrane becomes proton conducting polymer electrolyte when added with 12-phosphotungstic acid (PWA). The conductivity of the membranes was measured in the temperature range from room temperature to $150^{\circ}C$ under saturated humidity and a maximum conductivity of $5{\times}10^{-5}\;Sm^{-1}$ was obtained at $150^{\circ}C$.

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ZrO2/TiO2/Organosilane Hybrid Composites via Low Temperature Sol-Gel Process for Hard and Transparent Coating (저온 졸-겔 법을 이용한 투명 하드코팅 필름용 ZrO2/TiO2/Organosilane 복합체 연구)

  • Lee, Su-Hyeon;Choi, Jongwan
    • Journal of the Korean Applied Science and Technology
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    • v.35 no.1
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    • pp.80-88
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    • 2018
  • In this study, we prepared hybrid composites by using low temperature sol-gel process for transparent and hard coating film. The hybrid composites consist of $ZrO_2/TiO_2/organosilane$, of which organosilane was introduced 3-(trimethoxysilyl)propyl methacrylate due to the role of a photocurable ceramic material for low temperature process. The ceramic composites with various composition ratios were coated on a polycarbonate substrate using a sol-gel process of low temperature process, and characterized optical and mechanical properties of coated thin film. The transparencies of coated thin films were 97.5 % or more, and the pencil hardness were 9H or more. In the case of the ZTS-2-1, the nano-indentation hardness was measured at the highest value of 1.14 GPa.

Effect of Solvents on the Photochromic Properties of Spiropyran in Hard Coating Films Prepared by Sol-Gel Method (Spiropyran의 분산용매가 Sol-Gel 하드 코팅 막의 광 변색 특성에 미치는 영향)

  • Kim, Dae Hyun;Shin, Yong Tak;Lee, Ju Yeon;Hong, Wongil;Lee, Bum Suk;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.47 no.4
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    • pp.430-435
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    • 2009
  • Spiropyran-doped organic-inorganic hybrid coatings were prepared starting from glycidoxypropyl triethoxysilane and vinyltriethoxysilane by a sol-gel method. They were applied as a thin layer to polycarbonate sheets and their photochromic properties were investigated. The effect of polarity of solvents dissolving the spiropyran was investigated on the photochromic properties. The decoloration rate of the spiropyran decreased with increasing the polarity of solvents dissolving the spiropyran because the open form of the spiropyran was easily stabilized in the polar gel matrix.

Electrochemical Characteristics of Indium Tin Oxide Nanoparticles prepared by Sol-gel Combustion Hybrid Method

  • Chaoumead, Accarat;Choi, Woo-Jin;Lee, Dong-Hoon;Sung, Youl-Moon
    • Journal of Electrical Engineering and Technology
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    • v.6 no.3
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    • pp.414-417
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    • 2011
  • Indium tin oxide (In:$SnO_2$) nanoparticles were synthesized employing a sol-gel combustion method followed by annealing. The TG, XRD, XPS and SEM results of the precursor powders and calcinated In:$SnO_2$ nanoparticles were investigated. Crystal structures were examined by powder XRD, and those results show shaper intensity peak at $25.6^{\circ}$ ($2{\theta}$) of $SnO_2$ by increased annealing temperature. A particle morphology and size was examined by SEM, and the size of the nanoparticles was found to be in the range of 20~30nm. In:$SnO_2$ films could controlled by nanoparticle material at various annealing temperature. The sol-gel combustion method was offered simple and effective route for the synthesis of In:$SnO_2$ nanoparticles.

Effect of Heat Treatment on the Morphology and Transparency of Thick Inorganic-Organic Hybrid Films Prepared by the Electrophoretic Sol-Gel Deposition of Polyphenylsilsesquioxane Particles

  • Hasegawa, Koichi;Katagiri, Kiyofumi;Matsuda, Astunori;Tatsumisago, Masahiro;Minami, Tsutomu
    • The Korean Journal of Ceramics
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    • v.6 no.1
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    • pp.15-20
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    • 2000
  • Thick inorganic-organic hybrid films were prepared on ITO-coated glass substrates by the electrophoretic sol-gel deposition of polyphenylsilsesquioxane particles. The morphology of the deposited films changed from the aggregate of the spherical particles to monolith by heat treatment at temperatures higher than $200^{\circ}C$. Transparency of the films was significantly improved accompanied by the morphological change of the particles. The degree of the morphological change was governed by two factors; maximum heat treatment temperature and heating rate. Transparent thick films of ca. 3$\mu\textrm{m}$ in thickness were obtained only by heat treatment at $400^{\circ}C$ for 2h with rapid heating from room temperature to $400^{\circ}C$. These films obtained were strongly adhered to the ITO-coated glass substrates and has a very smooth surface.

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Enhanced Corrosion Protection Performance by Novel Inhibitor-Loaded Hybrid Sol-Gel Coatings on Mild Steel in 3.5% NaCl Medium

  • Suleiman, Rami K.
    • Corrosion Science and Technology
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    • v.18 no.5
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    • pp.168-174
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    • 2019
  • The sol-gel methodology has been applied successfully in the synthesis of a novel hybrid coating based on dimethoxymethyl-n-octadecylsilane precursor. The newly synthesized parent coating was functionalized further with two commercially-available corrosion-inhibitive pigments Moly-$white^{(R)}$ 101-ED and Hfucophos $Zapp^{(R)}$, applied to mild steel panels, and immersed continuously in 3.5% NaCl electrolytic solution for 288 h. The corrosion protection performance of the prepared functional coatings was evaluated using electrochemical impedance spectroscopy (EIS) and DC polarization techniques. An enhancement in the barrier properties has been revealed from the electrochemical characterization data of the hybrid films, in comparison with untreated mild steel substrates following long-term immersion in 3.5% NaCl. The corrosion resistance properties of the newly developed coatings over mild steel substrates found to be largely dependent on the type of the loaded inhibitive pigment in which the Moly-white inhibitor has a positive impact on the corrosion protection performance of the parent coating, while an opposite behavior was observed upon mixing the base polymeric matrix with the commercially-available Zapp corrosion inhibitor.

Preparation of Hard Coating Solutions with High Refractive Index for Polycarbonate Sheet by the Sol-Gel Method (Sol-Gel 법에 의한 Polycarbonate 시트에 적용 가능한 고굴절률을 보이는 하드코팅 용액의 제조)

  • Cheong, Il Yeop;Cho, Kyung In;Cheong, Sang Hyuk;Park, Hyo Nam;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.45 no.4
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    • pp.335-339
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    • 2007
  • In order to overcome the problem of poor hardness of transparent polycarbonate (PC) sheets, organic-inorganic hybrid hard coating solutions, which show a high refractive index above 1.58, were made by the sol-gel method. These hybrid coating solutions were obtained from mixture of titanium tetraisopropoxide (TTIP), and (3-glycidoxypropyl)trimethoxysilane (GPTMS). The PC sheets were spin-coated, and cured at $120^{\circ}C$ for 2 hr. Change of refractive index in the range of 1.53-1.61 was obtained by varying the GPTMS content. The refractive index of the coated film decreased with increasing the GPTMS content, while the pencil hardness of the coated film was found to increase with increasing the GPTMS content.

Encapsulation and optical properties of Er3+ ions for planar optical amplifiers via sol-gel process (졸-겔법을 이용한 광증폭기의 Er 이온 캡슐화 및 광학적 특성)

  • Kim, Joo-Hyeun;Seok, Sang-Il;Ahn, Bok-Yeop
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2003.11a
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    • pp.135-135
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    • 2003
  • The fast evolution in the fold of optical communication systems demands powerful optical information treatment. These functions can be performed by integrated optical systems. A key component of such systems is erbium doped waveguide amplifier(EDWA). The intra 4f radiative transition of Er at 1.5 $\mu\textrm{m}$ is particularly interesting because this wavelength is standard in optical telecommunications. The fabrication of waveguide amplifier for integrated optics using sol-gel process has received an increasing attention. Potential advantage of lower cost by less capital equipment and easy processing makes this process an attractive alternatives to conventional technologies like flame hydrolysis deposition, ion exchange and chemical vapor deposition, etc. In addition, sol-gel process has been found to be extremely suitable for the control of composition and refractive index related directly with optical properties. The main drawback of such an amplifier with respect to the EDWA is the need for a much higher Er3+ concentration to compensate for the smaller interaction length. However, the high doping of Er might be resulted in the non-radiative relaxation by clustering of Er ions End co-operative upconversion. In order to solve this problem, we investigate the possibility of avoiding short Er-Er distances by encapsulation of Er3+ ions in hosts such as organic-inorganic hybrid materials. For inorganic-organic hybrid sols, methacryloxypropyltrimethoxysilane (MPTS), zirconyl chloride octahydrate and erbium(III) chloride hexahydrate were used as starting materials, followed by conventional sol-gel process. It was observed by TEM that nano sols having core/shell toplology were formed, depending on the mole ratio of Zr/Er. The surface roughness for the coatings on Si substrate was investigated by AFM as a function of Zr/Er ratio. The local environment and vibrational Properties of Er3+ ions were studied using Near-IR, FT-IR, and UV/Vis spectroscopy. Nano hybrid coatings derived from polymer and Er doped encapsulation Eave the good luminescence at 1.55$\mu\textrm{m}$.

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Inorganic-organic Hybrid Proton Conductive Membranes Doped with Phosphoric Acid

  • Huang Sheng-Jian;Lee Yong Su;Lee Hoi Kwn;Kang Won Ho
    • Proceedings of the KAIS Fall Conference
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    • 2004.06a
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    • pp.96-99
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    • 2004
  • A new proton conductive inorganic-organic hybrid membrane doped with $H_3PO_4$ was fabricated via sol-gel process wit 3- glycidoxypropyltrimethoxysilane(GPTMS), 3-aminopropyltriethoxysilane(APTES) and tetraethoxysilane(TEOS) asprecursors. Theproto conductivity of about 3.0$\times10^{-3}S/cm$ was obtained at $120^{\circ}C$ under $50\%$ relative humidity (R.H). DTA curves showed that the thermal stability of the membrane is significantly enhanced by the presence of $SiO_2$ framework up to $250^{\circ}C$. SEM and XRD revealed that the gel is microporou and amorphous. The addition of APTES improved the conductivity of the membranes and the effect of the APTES on the conductivity was also discussed in this paper.

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Preparation and Characterization of Titania-Silica Hybrid Fibers by Electrospinning (전기방사에 의한 Titania-Silica 혼성 섬유의 제조 및 특성분석)

  • Park, Sung-Seen;Lee, Seung-Goo;Joo, Chang-Whan
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.04a
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    • pp.386-387
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    • 2003
  • Titania-silica hybrid inorganic materials are interesting subjects and many researchers have been studying.$\^$1-3)/ In general, the titania-silica hybrid materials are used as film and catalyst. Sol-gel method has widely been used as an alternative technology to prepare a wide variety of applications including monoliths, powders, coatings, and fibers.$\^$4-6)/ The typical sol-gel method is hydrolysis and condensation of tetraethyl orthosilicate (TEOS), Si(OCH$_2$CH$_3$)$_4$. (omitted)

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