• Journal of Energy Engineering
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• v.3 no.1
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• pp.36-43
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• 1994

광전기화학전지의 전극으로 TiO2 반도체 전극을 선택하여, sol 용액을 dip-coating 방법으로 티타늄 금속위에 입혀 만든 TiO2 필름의 광전기화학특성을 연구하였다. Dipping 횟수와 TiO2 필름의 두께간에는 선형적인 비례관계가 나타났으며, 15회 코팅하여 얻은 5.5$\mu\textrm{m}$에서 가장 큰 광전류값을 얻을 수 있었다. 전극의 최종열처리를 50$0^{\circ}C$에서 20분간 행하였을 때 광전류값이 가장 컸고, 열처리시간을 증가시키고, 열처리 온도가 50$0^{\circ}C$ 이상이 되면 광전류는 감소하였다. 유기첨가제로 HPC를 사용한 경우 sol 용액의 점도 및 제조된 전극의 광전류값이 가장 크게 나타났다.

• Journal of Surface Science and Engineering
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• v.33 no.1
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• pp.38-47
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• 2000

A Ti(CN) layer was formed on aluminum alloy by using diethylamino titanium, hydrogen and nitrogen with the pulsed DC PACVD process. Effect of process parameters such as precursor evaporation temperature, duty ratio, frequency, voltage, $H_2$/$N_2$gas ratio on the properties of Ti(CN) layer were investigated. The layer thus obtained had high hardness and low friction coefficient. Detailed results on the hardness, surface morphology, XRD, WDS analysis, wear test and scratch test of this layer are presented.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.226-226
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• 2014

난삭재에 대한 관심이 증가하면서 최근 공구시장에서는 고경도, 고내열성을 갖는 코팅물질에 대한 연구가 진행되고 있다. 따라서 두 장점을 모두 가진 나노복합구조를 가진 박막에 대한 연구가 진행되고 있으며 특히 경도에 영향을 미치는 나노결정립과 내열성에 영향을 주는 비정질층의 비율을 조절하는 연구에 집중하고 있다. 따라서 본 연구에서는 질소분압이 변화시키며 CrZrSiN 박막의 물성 변화를 확인하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.241-241
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• 2014

$SnO_2-core/Zn-shell$ heteronanowires were fabricated by a two-step process: thermal evaporation of Sn powders and employing a sputtering technique with a Zn target. X-ray diffraction, high-resolution transmission electron microscopy, and EDX spectra coincidentally indicated that the shell layer comprised the Zn phase. From Gaussian deconvolution studies, we observed that photoluminescence (PL) spectra consisted of yellow, green, and ultraviolet (UV) emission bands, regardless of shell-coating. We speculated the possible mechanisms of these emission peaks.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.11a
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• pp.66-67
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• 2012

As polymer coatings of nano-structured surface become significant to obtain functionalized materials, catechol derived from a mussel protein has attracted increasing attention for its universal adhesiveness. In addition to the unique adhesion property, its reducing ability of metal ions during oxidative polymerization to polydopamine (pD) widely expands the application of catechol molecules in the field of surface modification. In this study, we present the catechol conjugated smart polymer coatings for regulating surface properties such as wettability and anti-fouling effects. In additino, the in situ silver coating of electrospun polymer nanofibers using a silver-catechol redox reaction is presented as a simple method to produce metal nanostructures.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.11a
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• pp.413-416
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• 2011

대용량 기기의 효율적인 전력 공급을 위해 부스닥트의 수요가 급증하고 있으며, 특히 컴팩트형 부스닥트는 케이블에 비해 무게와 부피가 가볍고 전력 효율도 25% 이상 우수하며, 기술의 핵심은 에폭시분체도료의 절연 특성 향상과 제작공정의 최적화와 안정화이다. 따라서 본 연구에서는 유동침적방식(Fluidized Bed Process)에 대한 최적화와 에폭시 분체도료의 절연설계 및 열화특성에 대해 실험 검토 하였다. 또한 전기화재의 주된 원인인 아크방전특성과 절연파괴 특성에 대한 분석과 더불어 다양한 상용제품들의 특성을 비교하였다.

• Proceedings of the Korean Fiber Society Conference
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• 2003.10b
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• pp.169-170
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• 2003

There was little development in transparent conductive polymer films and their limited studies have been mainly focused on polymer films coated by water-soluble PEDOT doped with the polymeric counteranion poly(4-styrenesulfonate) (PEDOT-PSS)[1-3]. However PEDOT-PSS as coating material has some difficulties because of high viscosity and low solubility in organic solvent except for in water. In this study, in order to extend practical applications of PEDOT and to prepare conductive PC films, we tried to prepare PEDOT-coated PC films and investigated their conductivity and thermal stability. (omitted)

• Journal of the Korean Ceramic Society
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• v.41 no.7
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• pp.497-502
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• 2004

A hybrid coextrusion and lamination process has been developed to fabricate macrochanneled bioceramic scaffolds. This process was mainly composed of three steps (i.e., coextrusion of thermoplastic compound, lamination, and thermal treatment), forming unique pore channels in dense bioceramic body. Pore channels were formed by removing carbon black material, while calcium phosphate or Tetragonal Zirconia Polycrystals (TZP) with a calcium phosphate coating layer were used as dense body. Two kinds of pore structures were fabricated; that is, the pore channels were formed in uni- or three-directional array. Such macrochanneled bioceramic scaffolds exhibited the precisely controlled pore structure (pore size, porosity, and interconnection), offering excellent mechanical properties and cellular responses.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.11a
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• pp.125-127
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• 1996

This paper deals with the fabrication of 4 poles anisotropic Sr·ferrite plastic magnets. After Polyamide6 and polyamlde12 are kneaded respectively with Sr·ferrite powder, silane coupling and calcium stearate of lwt% are added for coating and pelleting. The pelleted specimen are injection-moulded under the magnetic field using 4 poles mould. For 4 poles anisotropic Sr·ferrite plastic magnets with polyamide6 as a binder, the surface magnetic flux density distribution is +943.8∼-943.87kG and the deviation is 5.2%, where as with polyamide12, the distribution is +1040.9∼-1040.9kG and the deviation is 5.4%. It shows that both of the magnet distributions are stable. As the results of the experiments, we find 4 poles anisotropic Sr·ferrite magnets have good properties as the materials appropriate for manufacturing magnet type synchronous motors.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.11a
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• pp.175-179
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• 1996

Ferroelectric SrBi$_2$Ta$_2$$O_{9}$ thin films were fabricated by tole Sol-Gel method using a spin-on coating with MOD(Metal Organic Dccomposition) solution on Pt/Ti/SiO$_2$/Si(100) substratcs. The films were anncalcd at 80$0^{\circ}C$ for one hour in oxygen atmosphere. The effects of Bi/Ti mole ratios on crystalline orientations, surface morphologies, and subface composition SBT thin films with a Bi/Ta mole ratios from 1.1 to 1.3 were investigated using X-ray Diffractometry (XRD). Atomic Force (AFM), X-Ray Photoelectron Spectroscopy(XPS). Ferroelectric properties of these films were also measured.d.