• Nuclear Engineering and Technology
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• 제53권1호
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• pp.188-198
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• 2021

A modern approach to nuclear energy involves reprocessing like transmutations of spent nuclear fuel products to reduce their radiotoxicity and time needed for their storage. For this purpose, they are immobilized in inert matrices made of zirconia and can be "burned" in fast neutron reactor or Accelerator Driven System. These matrices in spherical form can be obtained by sol-gel process. The paper presents a method of microspheres fabrication based on the combined Complex Sol-Gel Process and double extraction process consisting in the preparation of zirconium-ascorbate sol and simultaneous extraction of water and nitrates. The procedure allows obtaining gel microspheres with a diameter of 50 ㎛, which after heat treatment are processed into the final product. The synthesis of zirconia microspheres with Yttrium by internal gelation process is well known for over a decade now. However, the explanation and characterization of synthesis of such material by extraction of water process is rarely found. Parameters such as: pH, viscosity, shape, sphericity and crystal structure have been determined for synthesized products and semi-products. In addition, preliminary research consisting in irradiation of the obtained materials in fast and thermal neutron flux was carried out. The obtained results are presented and described in this work.

• The Korean Journal of Ceramics
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• 제4권2호
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• pp.99-102
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• 1998

Cordierite ceramics with low dielectric constants were obtained through sol-gel techniques using as metal alkoxides. The powders for the sintered cordierite ceramics were prepared by hydrolysis of metal alkoxides with ethanol and distilled water. In the hydrolysis, the mole ratio of HCI/TEOS was controlled by changing the amount of HCI as a catalyst. The sol-gel derived powders were dried, pressed, and fired at $1300^{\circ}C$. The dried powders were calcined at $800{\circ}C$ for 3hours to remove residual organics. The fired bodies with different dielectric constants were obtained by using HCI adjusted to various mole ratios of HCI/TEOS in the process. The variation of the amount of HCI catalyst led to a significant influence on dielectric contant, which was attributed to the formation of pores in the sintered body. Especially, the porosity of the sintered body influenced the dielectric constants.

• 한국전기전자재료학회논문지
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• 제11권7호
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• pp.535-540
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• 1998

Thin films of PLZT were prepared on indium tin oxide(ITO) coated glass substrates by sol-gel process and annealed by rapid thermal annealing(RTA) at $750^{\circ}C$ for 5 minutes. The crystal structure of PLZT thin films were investigated for a different Zr mol% content. XRD results showed that the crystallographic structure was transitted from tetragonal to rhombohedral structure as Zr mol% increased. Raman spectroscopy results showed that the bands of spectra became broader as the amount of Zr mol% increased and two crystal phase coexisted at 2/55/45 PLZT film. Raman spectroscopy was useful for crystal structure analysis of PLZT thin films.

• 한국전기전자재료학회논문지
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• 제29권9호
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• pp.527-531
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• 2016

In this study, p-type thin film transistors consisting of CuO channels were fabricated by sol-gel process, with copper (II) acetate monohydrate precursors. At $500^{\circ}C$, the deposited films were fully converted into monoclinic phase CuO. The fabricated CuO thin film transistors deliver field effect mobility in saturation regime of $0.015cm^2/Vs$, and $I_{on}/I_{off}$ of ${\sim}10^3$. The degradation of the performance of the fabricated CuO thin film transistor caused by the exposure to air has been studied.

• 한국재료학회지
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• 제16권10호
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• pp.599-605
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• 2006

N-(3-triethoxysilylpropyl)-1,4-diaminoanthrquinone-2,3-dicarboximide (TESP-DADI), an organic blue pigment, has been prepared and incorporated into silica solid matrix reacting triethyl orthosilicate (TEOS) via sol-gel method. Morphology and microstructure of resulting hybrid pigment were studied employing SEM and TEM. The micrographs and particle size distributions showed that uniform pigment can be obtained employing TEOS-based sol-gel method forming silica core. Particle size distribution of dispersed pigment in water was examined using the technique of dynamic light scattering. The ensuing pigment dispersion ink was subjected to various physicochemical evaluation such as viscosity, surface tension, inkjet stability, storage stability, and color change as inkjet ink using spectrophotometric, and microscopic techniques.

• 한국세라믹학회지
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• 제31권10호
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• pp.1231-1239
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• 1994

In this study, gel powder which had relatively high hydration reactivity in CaO and P2O5 rich composition of CaO-P2O5-SiO2-H2O system was prepared by sol-gel process and its hydrated specimen was manufactured. The it was investigated to appropriate calcination temperature in sol-gel process which hydrated specimen of gel powder have proven to strength and the effect of factors influenced strength in hydration process. The major product of before and after hydration reaction was hydroxyapatite, and crystalline phase of C-S-H was already formed during gelation process. After hydration reaction of pressed specimen, crystalline phase of C-S-P-H was formed. It was hydrated product of silicocarnotite (5CaO.P2O5.SiO2). Gel phases of C-S-H and C-S-P-H occured as a result of partial substitution of amorphous silica by P2O5 was formed. The strength of hydrated hardened body is developed by strong bonding and bridging between the gel phases of C-S-H or C-S-P-H and the crystalline products such as hydroxyapatite, Ca(OH)2 C-S-H and C-S-P-H. In addition, the ultrafine gel powder have an great effect on increase of hydration reaction.

• Korean Chemical Engineering Research
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• 제46권3호
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• pp.506-511
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• 2008

본 연구에서는 이트륨과 유로퓸 질산수용액으로부터 솔-젤 및 연소공정에 의한 적색 형광체를 제조함에 있어, 솔-젤반응의 고찰을 통한 반응메카니즘을 해석하고, 제조된 적색형광체의 특성을 알아보고자 하였다. 무정형 구연산염 솔-젤 반응은 반응 초기에 킬레이트화 반응과 가수분해 반응이 완료되었으며, 가수분해의 진행에 따라 축합중합반응은 유기산 형성 축합중합 보다는 물 형성 축합중합반응이 더 우세하였다. 솔-젤 반응의 진행을 위해서는 이트륨(유로퓸 포함)과 젤화 작용제인 구연산 몰 비는 1 : 2 이상이 필요하였다. 솔-젤과 건조과정을 거쳐 얻은 젤 분말의 열분석 결과 형광체를 얻기 위한 소성온도는 $700^{\circ}C$ 이상이 되어야 하며, 젤 분말의 소성 시 소성온도가 증가함에 따라 생성되는 형광체의 결정도가 향상되었으며, 결정립 크기가 증가하였다. 제조된 형광체의 발광특성 분석 결과, 출발용액 내 금속이온(이트륨 및 유로퓸)의 농도, 그리고 소성온도가 증가할수록 발광세기가 증가하였다.

• 센서학회지
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• 제21권4호
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• pp.311-317
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• 2012

Disposable amperometric screen-printed biosensor strips have been fabricated by a sol-gel encapsulation for the analysis of glucose. The glucose oxidase(GOx) is entrapped in the gel matrix through sol-gel transition of tetraethoxysliane(TEOS). The biosensor is fabricated by GOx containing thin film of TEOS gel on the surface of screen-printed carbon electrode(SPCE). The GOx-containing thin film of TEOS gel offers a one-step modification process on the surface of SPCE. The optimum conditions for glucose determination have been characterized with respect to the applied potential, enzyme loading ratio, and pH. The linear range and detection limit of glucose detection were from 2.0 mM to 16.0 mM and 0.25 mM, respectively.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1994년도 추계 학술발표 강연 및 논문 개요집
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• pp.107-107
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• 1994

• 한국고분자학회지:고분자과학과기술
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• 제4권6호
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• pp.444-451
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• 1993