• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.446-447
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• 2007

Aluminisum-doped zinc oxide (AZO) films are attractive materials as transparent conductive electrode because they are inexpensive, nontoxic and abundant element compared with indium tin oxide (ITO). In our paper, AZO films have been deposited on glass (coming 1737) substrates by RF magnetron sputtering. The AZO film was post-annealed at $600^{\circ}C$, $800^{\circ}C$ for 2 hr with $N_2$ atmosphere, respectively. We investigated that the electric properties and qualitative analysis of AZO films, which measured using the methods of Hall effect, X-ray photoelectron spectroscopy (XPS).

• 한국재료학회:학술대회논문집
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• 한국재료학회 2002년도 추계학술발표강연 및 논문개요집
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• pp.38-38
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• 2002

• 폴리머
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• 제26권3호
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• pp.389-399
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• 2002

단파장 자외선을 이용하여 폴리에틸렌테레프탈레이트(PET) 섬유 표면의 화학적 성질을 개질 하였다. 자외선 조사에 의하여 PET 섬유의 화학결합이 절단되어 섬유표면에 COOH기가 생성되고 자외선 조사시간에 비례하여 COOH기가 증가함을 FT-IR과 XPS 분석에 의하여 확인하였으며 XPS측정을 통하여 PET 섬유 표면에 생성된 COOH기가 12개월후에도 변화가 없음을 알 수 있었다. 또한 자외선 조사 PET 섬유에 기능성을 부여하기 위하여 사용한 친수성의 양이온성 천연화합물이, 자외선 조사 PET 섬유에 용이하게 흡착되는 현상으로부터 자외선 조사에 의하여 PET 섬유표면에 음이온성을 나타내는 COOH기가 존재함을 흡착실험을 통하여 확인하였다. 항균성 및 소취성을 측정한 결과 자외선 조사시간이 30분 이상인 경우에 99% 이상의 항균성과 75% 이상의 소취성을 나타내는 기능성 PET 섬유의 제조가 가능하였다.

• 공업화학
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• 제27권6호
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• pp.627-632
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• 2016

PVDF-PVC 적층필름의 계면접착력을 향상시키기 위한 새로운 방법으로 PVDF 필름 표면에 유전체장벽 코로나 방전을 통한 EMA 단량체 커플링을 시도하였다. EMA 1% 분위기에서 코로나 표면처리한 PVDF 필름을 사용하여 제조한 PVDF-PVC 적층필름의 계면접착력은 코로나 처리하지 않은 PVDF에 비해 현저히 향상되었다. 코로나 방전처리에 의해 PVDF 필름 표면의 접촉각은 현저히 감소하였다. XPS 분석 결과, 코로나 처리에 의해 필름 표면의 탄소와 산소함량은 증가하는 반면 불소 함량은 감소하였다. XPS $C_{1s}$ 피크의 curve fitting 결과, 코로나 방전 처리에 의해 비극성 C-C 결합 탄소와 산소와 결합하는 탄소의 비율은 점차 증가한 반면, 불소와 결합하는 탄소의 비율은 크게 감소하는 경향을 나타내었다.

• Restorative Dentistry and Endodontics
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• 제43권4호
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• pp.46.1-46.10
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• 2018

Objectives: This study was to evaluate the antibacterial effect of different instrumentation and irrigation techniques using confocal laser scanning microscopy (CLSM) after root canal inoculation with Enterococcus faecalis (E. faecalis). Materials and Methods: Mesiobuccal and mesiolingual canals of extracted mandibular molars were apically enlarged up to a size 25 hand K-file, then autoclaved and inoculated with E. faecalis. The samples were randomly divided into 4 main groups according to the system of instrumentation and irrigation: an XP-endo Shaper (XPS) combined with conventional irrigation (XPS/C) or an XP-endo Finisher (XPF) (XPS/XPF), and iRaCe combined with conventional irrigation (iRaCe/C) or combined with an XPF (iRaCe/XPF). A middle-third sample was taken from each group, and then the bacterial reduction was evaluated using CLSM at a depth of $50{\mu}m$ inside the dentinal tubules. The ratio of red fluorescence (dead cells) to green-and-red fluorescence (live and dead cells) represented the percentage of bacterial reduction. The data were then statistically analyzed using the Kruskal-Wallis test for comparisons across the groups and the Dunn test was used for pairwise comparisons. Results: The instrumentation and irrigation techniques had a significant effect on bacterial reduction (p < 0.05). The iRaCe/XPF group showed the strongest effect, followed by the XPS/XPF and XPS/C group, while the iRaCe/C group had the weakest effect. Conclusions: Combining iRaCe with XPF improved its bacterial reduction effect, while combining XPS with XPF did not yield a significant improvement in its ability to reduce bacteria at a depth of $50{\mu}m$ in the dentinal tubules.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1994년도 춘계 학술발표 강연 및 논문 개요집
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• pp.123-123
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• 1994

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.272.2-272.2
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• 2016

Copper-Tin (CuSn) thin films were synthsized by rf magnetron co-sputtering method with pure Cu and Sn metal targets with various rf powers and sputtering times. The obtained CuSn thin films were characterized by a surface profiler (alpha step), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray induced Auger electron spectroscopy (XAES), and contact angle measurement. The deposition rates were calculated by the thickness of CuSn thin films and sputtering times. We observed hexagonal Cu20Sn6 and cubic Cu39Sn11 phases from the films by XRD measurement. From the survey XPS spectra, the Cu and Sn main peaks were observed. Therefore, we could conclude CuSn thin films were successfully fabricated on the substrate in this study. The changes of oxidation states and chemical environment of the films were investigated with high resolution XPS spectra in the regions of Cu 2p, Cu LMM, and Sn 3d. Surface free energy (SFE) and wettability of the CuSn thin films were studied with distilled water (DW) and ethylene glycol (EG) using the contact angle measurement. The total SFE of CuSn thin films decreased as rf power on Cu target increased. The contribution to the total SFE of dispersive SFE was relatively superior to polar SFE.

• 통합자연과학논문집
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• 제10권4호
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• pp.245-248
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• 2017

The Cu and CuSn/PVP nanofibers were fabricated by electrospinning method by controlling various parameters. The precursor solution was prepared with copper(II) acetate monohydrate ($Cu(CH_3COO)_2$) and tin chloride dihydrate ($SnCl_2{\cdot}2H_2O$), and polyvinylpyrrolidone (PVP) for adjusting viscosity. The fabricated nanofibers were calcined at 873 K in Ar atmospheric environment for 5 hours to remove the solvent and polymer. The morphology and diameter of nanofibers were measured by optical microscopy (OM) with Motic image plus 2.0 program. The components and chemical environment were investigated with X-ray photoelectron spectroscopy (XPS). From the XPS survey spectra, we confirmed that CuSn/PVP nanofibers were successfully fabricated. The XPS peaks of C 1s and N 1s were remarkably decreased after calcination of the nanofibers at 873 K. It implies that the PVP was completely decomposed after calcination at 873 K.

• Korean Chemical Engineering Research
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• 제49권1호
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• pp.69-74
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• 2011

본 연구에서는 전기방사를 이용하여 PS의 취성을 개선하고자 내충격성이 우수한 HIPS와 가교제 DVB를 혼합하여 방사한 후 가교와 술폰화 반응을 통해 HIPS 이온교환 나노섬유를 제조하였다. 또한, 이들을 FT-IR, XPS, 함수율, 이온교환 용량, SEM 및 접촉각으로 나노섬유의 기본특성을 확인하였다. FT-IR 및 XPS 구조분석 결과, HIPS 나노섬유는 술폰화 시간이 지남에 따라 $-SO_3H$기의 도입이 증가하는 것을 확인할 수 있었다. 또한 술폰화 시간이 지남에 따라 섬유의 친수성이 증가하여 DVB 함량이 7.5 wt%, 술폰화 시간이 200분일 때 함수율과 이온교환용량은 최대 75.6%, 2.67 meq/g으로 나타났다.

• KIEAE Journal
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• 제13권2호
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• pp.107-112
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• 2013

The purpose of this study is to analyze an insulation property and to establish a design standard for the underground space in architecture. Insulation materials for this study are 12 kinds of Insulation which qualified KS standards(3 classes of EPS type 1, 3 classes of EPS type 2(Neopor), 3 classes of XPS and 3 classes of PU Boards). For insulation materials of underground space, insulating and water tightening property are desired. So conductivity for insulating and water absorption for water tightening are measured in this study. Temperature, insulation is exposed to in the underground space, is different from temperature above the ground. Conductivity is measured in a temperature of $17^{\circ}C$, $20^{\circ}C$, $23^{\circ}C$ and $26^{\circ}C$. In KS standards, water absorption are measure after 24 hours, but insulation is exposed to water for a long time in the underground. So after 110 days, water absorption are measured. As time goes by, increasing of water absorption means decreasing of water tightening and insulating. So after water absorption had measured for 110 days, conductivity has measured again. As a result, XPS is selected as optimized insulation for underground. And Conductivity of XPS insulation with water should be added by 20%.