• 공업화학
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• 제8권1호
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• pp.122-131
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• 1997

아연-티타늄 복합금속산화물 탈황제를 제조하여 석탄가스중의 $H_2S$를 제거하는 고온탈황성능을 연구하였다. $H_2S$ 흡수에 의한 탈황제의 황화반응실험을 충전층 관형 흐름반응기를 사용하여 $550{\sim}750^{\circ}C$ 범위에서 수행한 결과 탈황율과 아연성분의 손실측면에서 $650^{\circ}C$가 최적 황화반응 온도임이 밝혀졌다. SEM 분석에 의해서 $650^{\circ}C$에서의 황화반응과 $750^{\circ}C$에서의 재생반응에 따른 탈황제 입자의 구조변화를 관찰하였다. 탈황성능의 지속성과 탈황제 내구성을 평가하기 위하여 연속적인 황화-재생 cycle 반응실험을 수행하였으며 10번째 cycle 이후에 수거반 탈황제 시료의 특성을 BET, XRD, SEM/EDX에 의해서 분석하였다. 아연-티타늄 복합 산화물 탈황제는 연속적인 황화-재생 cycle 동안에 거의 일정한 탈황성능을 나타내었다.

• 한국지반환경공학회 논문집
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• 제13권5호
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• pp.51-57
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• 2012

본 연구에서는 친환경적인 그라우트재의 개발을 위하여 연약지반에 대한 바이오그라우트 가능성을 확인하고, Bacillus Pasteurii 균을 이용하여 탄산칼슘 침전 효과를 분석하였다. 연약지반에 미생물의 탄산칼슘 침전을 이용하여 바이오그라우트에 미치는 영향을 알아보기 위해 4가지 시료의 조건(멸균 시료, 비멸균 시료, 반응용액과 미생물용액의 선처리 혼합시료, 반응용액과 미생물용액의 후처리 혼합시료)으로 실험되었다. 전자현미경(SEM), EDX와 X선 분석 회절기(XRD)를 이용하여 연약지반 시료의 분석을 수행하였고, 이러한 연구결과를 바탕으로 탄산칼슘 침전을 이용한 미생물 처리 공법은 바이오그라우트의 특성을 개선하였다.

• 한방재활의학과학회지
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• 제19권1호
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• pp.187-199
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• 2009

Objectives : The electroacupuncture was generally has been used in oriental medicine doctors. In recent years, there have been a few studies about safety and stability of acupuncture needle in itself, but then again research of acupuncture needle safety and stability on applying electroacupuncture have been insignificant. Therefore we investigated the safety and change in mechanical characteristic of acupuncture needle in electroacupuncture therapy. Methods : We observed mechanical characteristic change by SEM(Scanning Electron Microscope) and EDX(Energy Dispersive X-ray Spectroscopy), evaluated the hardness by vickers hardness tester. We used MTT assay and cell stain to study about biocompatibility of electroacupuncture. Results : In this study, any corrosion of material, alternation of elements, and change of hardness were not observed in surface analysis using SEM and EDX. In cytotoxity evaluation using MTT assay and cell stain, cell survival rate was low when practicing the electroacupuncture for more than 3 hours. Conclusions : Change of mechanical property was not observed based on the test results using surface analysis and hardness estimation by the electroacupuncture. And considering the biocompatibility, electroacupuncture was thought to be safe in an hour based on cytotoxity evaluation using MTT assay and cell stain.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2001년도 The IMAPS-Korea Workshop 2001 Emerging Technology on packaging
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• pp.127-133
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• 2001

솔더볼의 피로강도에 대한 솔더 조성의 영향을 조사하기 위하여 패키지 신뢰성 시험을 실시하였다. 공정조성 솔더, S $n_{62}$P $b_{36}$A $g_2$, S $n_{63}$P $b_{34.5}$A $g_2$S $b_{0.5}$ 솔더를 사용해 제조된 시편을 MRT Lv 2a 조건에서 전처리 후 TC 시험을 수행하였다. 제조 직후, 전처리 후, TC 후 각각에 대하여 전단강도를 측정하였으며, 미세 조직 사진을 얻었다. 또한, SEM과 EDX를 이용하여 파괴 기구에 대한 분석을 실시하였으며, 신뢰성 시험 후 전단강도의 저하에 대하여 논의하였다.다.

• 한국결정성장학회지
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• 제17권1호
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• pp.23-29
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• 2007

Pitch-coated anatase $TiO_2$ typed was prepared by $CCl_4$ solvent mixing method with different mixing ratios. Since the carbon layers derived from pitch on the $TiO_2$ particles were porous, the pitch-coated $TiO_2$ sample series showed a good adsorptivity and photo decomposition activity. The BET surface area for the carbon layer in the sample increases to increasing with pitch contents. The SEM results present to the characterization of porous texture on the pitch-coated $TiO_2$ sample and pitch distributions on the surfaces for all the materials used. From XRD data a weak and broad carbon peak of graphene with pristine anatase peaks were observed in the X-ray diffraction patterns for the pitch-coated $TiO_2$. The EDX spectra show the presence of C, O and S with strong Ti peaks. Most of these samples are richer in carbon and major Ti metal than any other elements. Finally, the excellent photocatalytic activity of pitch-coated $TiO_2$ with slope relationship between relative concentration of MB ($c/c_o$) and t could be attributed to the homogeneous coated pitch on the external surface by $CCl_4$ solvent method.

• 한국재료학회지
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• 제19권9호
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• pp.481-487
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• 2009

The photocatalysts of Fe-ACF/$TiO_2$ compositeswere prepared by the sol-gel method and characterized by BET, XRD, SEM, and EDX. It showed that the BET surface area was related to adsorption capacity for each composite. The SEM results showed that ferric compound and titanium dioxide were distributed on the surfaces of ACF. The XRD results showed that Fe-ACF/$TiO_2$ composite only contained an anatase structure with a Fe mediated compound. EDX results showed the presence of C, O, and Ti with Fe peaks in Fe-ACF/$TiO_2$ composites. From the photocataytic degradation effect, $TiO_2$ on activated carbon fiber surface modified with Fe (Fe-ACF/$TiO_2$) could work in the photo-Fenton process. It was revealed that the photo-Fenton reaction gives considerable photocatalytic ability for the decomposition of methylene blue (MB) compared to non-treated ACF/$TiO_2$, and the photo-Fenton reaction was improved by the addition of $H_2O_2$. It was proved that the decomposition of MB under UV (365 nm) irradiation in the presence of $H_2O_2$ predominantly accelerated the oxidation of $Fe^{2+}$ to $Fe^{3+}$ and produced a high concentration of OH radicals.

• Mass Spectrometry Letters
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• 제7권2호
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• pp.41-44
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• 2016

Secondary ion mass spectrometry (SIMS) is a promising tool to measure isotope ratios of individual uranium particles in environmental samples for nuclear safeguards. However, the analysis requires prior identification of a small number of uranium particles that coexist with a large number of other particles without uranium. In the present study, this identification was performed by scanning electron microscopy - energy dispersive X-ray analysis with automated particle search mode. The analytical results for an environmental sample taken at a nuclear facility indicated that the observation of backscattered electron images with × 1000 magnification was appropriate to efficiently identify uranium particles. Lower magnification (less than × 500) made it difficult to detect smaller particles of approximately 1 μm diameter. After identification, each particle was manipulated and transferred for subsequent isotope ratio analysis by SIMS. Consequently, the isotope ratios of individual uranium particles were successfully determined without any molecular ion interference. It was demonstrated that the proposed technique provides a powerful tool to measure individual particles not only for nuclear safeguards but also for environmental sciences.

• Environmental Engineering Research
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• 제14권1호
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• pp.32-40
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• 2009

In this study, we have prepared three kinds of carbon nanometer tube $CNT/TiO_{2}$ electrodes through impregnation with different concentration titanium n-butoxide (TNB) solution. The prepared electrodes were characterized with surface properties, structural crystallinity, elemental identification and photoelectrocatalytic activity. The $N_2$ adsorption data showed that the composites had decreased surface area compared with the pristine CNT. This indicated the blocking of micropores on the surface of CNT, which was further supported by observation via SEM. XRD results showed patterns for the composites and a typical single and clear anatase crystal structure. The main elements such as C, O and Ti were existed for all samples from the EDX data. The catalytic efficiency of the developed electrode was evaluated by the photoelectrodegradation of methylene blue (MB). The positive potential applied in photoelectrocatalytic (PEC) oxidation was studied. It was found that photoelectrocatalytic (PEC) decomposition of MB solution could be attributed to combination effects between $TiO_2$ photocatalytic and CNT electro-assisted. Through the comparison between photocatalytic (PC) oxidation and photoelectrocatalytic (PEC) oxidation, it was found that the PEC oxidation efficiency for MB is higher than that of PC oxidation.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2009년도 춘계학술대회 논문집
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• pp.159-162
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• 2009

온도가 조절되는 회분식 반응기에서 온도와 접촉금속이 Exo-tricyclo[$5.2.1.0^{2,6}$]decane (tricyclodecane, 이하 exo-THDCP로 표기함)의 열안정도에 미치는 영향을 GC/MS로 조사하였다. 그리고 Exo-THDCP와 접촉하는 금속의 특성은 SEM-EDX로 분석하였다. 보관 연료온도 증가 실험에서 exo-THDCP의 분해는 $350^{\circ}C$에서 시작되는 것으로 밝혀졌다. 연료접촉 금속의 경우, 스테인리스 스틸보다 티타늄이 exo-THDCP의 분해에 미치는 영향이 작은 것으로 나타났다.

• 한국결정성장학회지
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• 제14권2호
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• pp.37-46
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• 2004

The electrochemical adsorption of the Ag ions from aqueous solution on pelletized activated carbon monolith was investigated over wide range of operation time. The adsorption capacities of pelletized activated carbon monolith are associated with their internal porosity and are related properties such as surface area, pore size distribution. The chemical industry generates wastewater that contains toxic matters like heavy metals in small concentrations so that their economic recovery is not feasible. But, the method using activated carbon monolith can be used to withdrawal of heavy metals in waste water. After the electrochemical treatment, the quantitative properties in Ag ion solutions are also examined by pH concentration and studied elemental analysis by ICP-Atomic Emission Spectrometer and Energy Disperse X-ray (EDX) spectra. It is consider that the pH is very important factor at the reason of water pollutant with increasing acidity in industrial field. The result of quantitative analysis using Inductively Coupled Plasma-Atomic Emission Spectrometer of metal after electrochemical reaction in Ag ions solution depending on time are shown that the amount of Ag ions deposited was decreased with growth of Ag particles on the carbon surfaces as increasing electrochemically treated time. And, surface morphologies are investigated by scanning electron microscopy (SEM) to explain the changes in adsorption properties.