• Title/Summary/Keyword: TaN

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Antimutagenic Effects of Browning Products Reacted with Polyphenol Oxidase Extracted from Apple (사과 Polyphenol Oxidase에 의한 효소갈변반응 생성물의 항돌연변이 효과)

  • Baik, Chang-Weon;Ham, Seung-Shi
    • Korean Journal of Food Science and Technology
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    • v.22 no.6
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    • pp.625-631
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    • 1990
  • This study was carried out to investigate the antimutagenic effects of five kinds of apple enzymatic browning reaction products(AEBRP) on mitomycin C (MMC), N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), 4-nitroquinoline-1-oxide(4NQO), benzo(${alpha}$)pyrene(B(${alpha}$)P) and 3-amino-1,4-dimethyl-5H-pyri-do [4,3-b]indol (Trp-P-1). In spore rec-assay using B. subtilis Hl7($rec^+$) and M45($rec^-$), homocatechol-AEBRP and hydroquinone-AEBRP showed strong antimutagenic effects on MMC and MNNG as the concentration of AEBRP increased. In the Ames test using S. typhimurium TA98 and TA100, hydroxyhydroquinone-AEBRP and pyrogallol-AEBRP showed strong antimutagenic effects on Trp-p-1 and B(${alpha}$)p in TA98 and TA100 in the presence of S-9 mix. Most of AEBRPs suppressed about 50% to 80% the mutagenesis in S. typhimurium TA98 induced by MNNG, however, AEBRPs except hydroxyhydroquinone-AEBRP showed antimutagenic effects of about 94% in TA100. Antimutagenic effects of the five kinds of AEBRPs on 4-NQO were more or less weak, in particular homocatechol-AEBRP exhibited the inhibitory effect of about 48% in TA98, and homocatechol-AEBRP and hydroquinone-AEBRP showed inhibitory effects of about 46% to 58% in TA 100.

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Inhibitory Effects of Poturaca oleracea L. Extract on the Mutagenicity of Various Mutagen (각종 변이원에 대한 쇠비름 추출물의 돌연변이 억제 효과)

  • 최근표;정성원;김은정;함승시
    • Journal of the East Asian Society of Dietary Life
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    • v.7 no.4
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    • pp.527-537
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    • 1997
  • This study was performed to determine the effects of antimutagenicity of Porturaca oleracea L. in Korea. In Ames test, the ethanol extract of Poturaca oleracea L. inhibited mutagenic activity of N-methyl-N'-nitro-N-nitrosoguanidine(MNNG), , 4-nitroquinoline-1-oxide(4NQO), benzo($\alpha$)pyrene (B($\alpha$)P) and 3-amino-1,4-dimethyl-5H-pyrido-(4,3-b)indole (Trp-P-1) in Salmonella typhimurium TA98 and TA100. But hot-water extract Poturaca oleracea L. only Inhibited mutagenic activity of MNNG in Salmonella typhimurium TA100, On 4NQO, the ethanol extract 100-1,600$\mu\textrm{g}$/plate of Porturaca oleracea L. showed a slight inhibitory effect of 13-48%, 4-47% in TA98 and TA100, respectively, but on MNNG, it showed higher inhibitory effect of 6-86% in TA100, And the treatment of 1,600$\mu\textrm{g}$/plate of ethanol extract of Porturacea L. had strong antimutagenicity with 74-87% inhibition against TA98 and TA100 induced by B(a)P and with 85-93% inhibition against TA98 and TA100 induced by Trp-P-1. The ethanol extract was fractionated with ether. chloroform, ethylacetate, butanol and water. Among them, most of the fraction except water fraction showed strong antimutagenicity effects against mutation induced by 4-NQO, MNNG, B(a)P and Trp-P-1. Chloroform fraction had strong antimutagenicity with 91% inhibition against TA100 induced by MNNG, diethyl etherfraction had strong antimutagenicity with 92%, 98% inhibition against TA98 and TA100 induced by 4NQO, Chloroform fraction had strong antimutagenicity with 97% inhibition against TA100 induced by B (a)P and diethyl etherfraction had strong antimutagenicity with 98% inhibition against both strain Induced by Trp-P-1, respectively.

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Effects of TiN/Ti Multilayer Coating on the Ti-30Ta-xZr Alloy Surface (Ti-30Ta-xZr 합금의 표면에 TiN/Ti 다층막코팅효과)

  • Kim, Y.U.;Jeong, Y.H.;Cho, J.Y.;Choe, H.C.;Vang, M.S.
    • Journal of the Korean institute of surface engineering
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    • v.42 no.4
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    • pp.161-168
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    • 2009
  • Effects of TiN/Ti multilayer coating on the Ti-30Ta-xZr alloy surface were studied by using various experiments. The Ti-30Ta containing Zr (5, 10 and 15 wt%) were melted 10 times to improve chemical homogeneity by using a vacuum furnace. And then samples were homogenized for 24 hrs at $1000^{\circ}C$. The specimens were prepared for TiN/Ti coating by cutting and polishing. The prepared specimens were coated with TiN/Ti multilayers by using DC magnetron sputtering method. The analyses of coated surface and coated layer were carried out by field emission scanning electron microscope(FE-SEM), EDX, and X-ray diffractometer(XRD). From the microstructure and XRD analysis of Ti-30Ta-xZr alloys, The equiaxed structure was changed to needle-like structure with increasing Zr content. And $\alpha$-peak and elastic modulus increased as Zr content increased. The $\alpha$ and $\beta$ phase predominantly were found in the specimen containing high Zr content. According to the analysis of TiN/Ti coating layer, the surface defects and structures of Ti-30Ta-xZr were covered with TiN/Ti coating layer and surface roughness decreased.

Microstructure and TCR Properties of TaNx Thin Films Coated under various $Ar/N_2$ Fraction (질소분압에 따른 TaNx 코팅층의 미세조직과 TCR 특성 변화)

  • Kim Seon-Hwa;Choi Yong-Lak;Han Seong-Ryong;Ho Song-Gyu;Jung Jun-Hyuck
    • Proceedings of the KAIS Fall Conference
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    • 2005.05a
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    • pp.45-47
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    • 2005
  • 전기, 전자, 우주, 자동차, 무기 등의 여러 분야에서 응용되고 있는 고정밀, 고저항체 박막인 TaNx 다층박막을 반응성 마그네트론 스퍼터링법으로 제조하여 질소분압에 따른 TCR 특성 변화를 조사하고, XRD와 SEM 관찰을 통하여 미세조직이 전기적 성질에 미치는 영향을 알아보았다. 제조된 TaNx 박막의 전기저항은 질소분율이 증가함에 따라 저온보다 고온에서 전기저항이 감소함을 보여 뚜렷한 (-)TCR 특성을 나타내었다. XRD 분석 결과, $Ar/N_2$ 비가 0.05에서 TaN 상이 형성되고 0.1에서 우수한 결정성을 나타내었으며, $N_2$의 양이 증가할수록 비정질이 형성되었다. 박막의 표면 형상은 미세하고 불연속 아일랜드 형태로 변화하였다.

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Characteristics of Ta2O5 thin film prepared by RTMOCVD (RTMOCVD법에 의해 제조된 Ta2O5 박막의 특성)

  • So, Myoung-Gi;Kwong, Dim Lee
    • Journal of Industrial Technology
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    • v.19
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    • pp.101-105
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    • 1999
  • Ultra thin $Ta_2O_5$ gate dielectrics were prepared by RTMOCVD (rapid thermal metal organic chemical vapor deposition) using Ta source $TaC_{12}H_{30}O_5N$ and $O_2$ gaseous mixtures. As a result, $Ta_2O_5$ thin films showed significantly low leakage current compared to $SiO_2$ of identical thickness, which was due to the stabilization of the interfacial layer by NO ($SiO_xN_y$) passivation layer. The conduction of leakage current in $Ta_2O_5$ thin films was described by the hopping mechanism of Poole-Frenkel (PF) type.

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Electromigration Characteristics Stduy DCV Interconnect Structures in Cu Dual-Damascene Process (Cu Dual Damascene 배선 공정에서의 DCV 배선구조의 EM 특성 연구)

  • Lee, Hyun-Ki;Choi, Min-Ho;Kim, Nam-Hoon;Kim, Sang-Yong;Chang, Eui-Goo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.123-124
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    • 2005
  • We investigated the effect of a Ta/TaN Cu diffusion barrier existence on the reliability and the electrical performance of Cu dual-damascene interconnects. A high EM performance in Cu dual-damascene structure was observed the BCV(barrier contact via) interconnect structure to remain Ta/TaN barrier layer. Via resistance was decreased DCV interconnect structure by bottomless process. This structure considers that DCV interconnect structure has lower activation energy and higher current density than BCV interconnect structure. The EM failures by BCV via structure were formed at via hole, but DCV via structure was formed EM fail at the D2 line. In order to improve the EM characteristic of DCV interconnect structure by bottomless process, after Ta/TaN diffusion barrier layer in via bottom is removed by Ar+ resputtering process, it is desirable that Ta thickness is thickly made by Ta flash process.

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Fabrication of Tantalum Nitride Thin-Film as High-temperature Strain Gauges (고온 스트레인 게이지용 질화탄탈박막의 제작)

  • 김재민;최성규;남효덕;정귀상
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.97-100
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    • 2001
  • This paper presents the characteristics of Ta-N thin-film strain gauges as high-temperature strain gauges, which were deposited on Si substrate by DC reactive magnetron sputtering in an argon-nitrogen atmosphere(Ar-(4∼16 %)N$_2$). These films were annealed for 1 hour in 2x10$\^$-6/ Torr vaccum furnace range 500∼1000$^{\circ}C$. The optimized conditions of Ta-N thin-film strain gauges were annealing condition(900$^{\circ}C$, 1 hr.) in 8% N$_2$ gas flow ratio deposition atmosphere. Under optimum conditions, the Ta-N thin-films for strain gauges is obtained a high resistivity, $\rho$=768.93 ${\mu}$Ω cm, a low temperature coefficient of resistance, TCR=-84 ppm/$^{\circ}C$ and a high temporal stability with a good longitudinal gauge factor, GF=4.12.

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A Study on the Surface of the Dry Etched TaN Thin Film by Adding The CH4 Gas in BCl3/Ar Inductively Coupled Plasma (BCl3/Ar 유도결합 플라즈마 안에 CH4 가스 첨가에 따른 건식 식각된 TaN 박막 표면의 연구)

  • Woo, Jong-Chang;Choi, Chang-Auck;Yang, Woo-Seok;Joo, Young-Hee;Kang, Pil-Seung;Chun, Yoon-Soo;Kim, Chang-Il
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.5
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    • pp.335-340
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    • 2013
  • In this study, the plasma etching of the TaN thin film with $CH_4/BCl_3/Ar$ gas chemistries was investigated. The etch rate of the TaN thin film and the etch selectivity of TaN to $SiO_2$ was studied as a function of the process parameters, including the amount of $CH_4$. X-ray photoelectron spectroscopy (XPS) and Field-emission scanning electron microscopy (FE-SEM) was used to investigate the chemical states of the surface of the TaN thin film.