• Title, Summary, Keyword: N-containing compound

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Study on Gaseous Nitrocarburizing Treatment (가스침질탄화법(浸窒炭化法)에 관한 연구(硏究))

  • Lee, S.Y.;Bell, T.
    • Journal of the Korean Society for Heat Treatment
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    • v.1 no.1
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    • pp.8-12
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    • 1988
  • This study has been carried out to evaluate gaseous nitrocarburizing treatment undertaken for pure iron at $570^{\circ}C$ in an atmosphere containing 50% endothermic gas, generated from natural gas, and 50% ammonia. The results obtained from the experiment are as follows ; 1) The microstructure of gaseous nitrocarburized pure iron consists of the compound layer on the surface and the diffusion zone beneath it. The compound layer progresses uniformly into ferrite with a thickness of $20{\mu}$ obtained after treating for 3 hours. 2) Chemical analysis has shown that the compound layer has a C/N ratio of 0.19 and that the average combined interstitial content of the compound layer is about 30 atomic percent, which is close to the lower limit of the ${\varepsilon}$-carbonitride phase field in Fe-C-N phase diagram. 3) X-ray diffraction analysis has revealed that the compound layer consists mainly of the c.p.h. phase, ${\varepsilon}-Fe_3$(C.N) and a small amount of $Fe_4N$ and traces of ferrite are also present in the compound layer. 4) The microhardness of the compound layer is about 600 V.H.N and shows a relatively sharp fall-off at the compound layer/diffusion zome interface. 5) The average actual degree of ammonia dissociation is calculated to be 27% for a gaseous nitrocarburizing treatment carried out at $570^{\circ}C$.

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Effect of Organic Sulfur-Containing Compounds on Hepatotoxicity in Rats Induced by N, N-Dimethylnitrosamine (디메틸니트로자민에 의한 흰쥐의 간독성에 미치는 유기황화합물의 효과)

  • Shin Hea Soon;Kang Joo Yeon
    • Environmental Analysis Health and Toxicology
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    • v.20 no.3
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    • pp.237-242
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    • 2005
  • This study il focused on the hepatopreventive effect in cirrhotic rats induced by N, N -dimethylnitrosamine treatment when organir Lulfur -containing compoundE were orally injected. Biochemical parameters (aspatate transaminase (AST), alanine transaminase (ALT) alkaline phosphatase (ALP), 1-protein and t-bilirubin) were measured in serum injured liver tissue. The increased AST and ALT values were significantly reduced by organic sulfur-containing compounds at the oral dotes of 50 mg/kg. The result of morphological changes have illustrated the accumulation of liver damages, Each as inflammatory cell accumulation and cirrhosis, caused by N, N-dimethylnitrosamine. Also, it was found that liver damages were prevented by the treatment of organic sulfur- containing compounds.

Influence of Ambient Gas Composition on the Microstructure of Plasma Nitrocarburised SCM435 steel (플라즈마 질탄화처리된 SCM435강의 미세조직에 미치는 가스 조성의 영향)

  • Lee, In-Seop
    • Korean Journal of Materials Research
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    • v.12 no.6
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    • pp.427-430
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    • 2002
  • Plasma nitrocarburizing treatment was performed for SCM 435 steel by using a plasma ion nitriding system. The effects of the variation of nitrogen and methan contents upon the hardened layer was investigated. Both the thickness of the compound layer and the amount of $\varepsilon$ phase in the compound layer increased with increasing nitrogen content. However, the thickness of the compound layer decreased due to unstable plasma for an atmosphere containing 90% $N_2$ gas content in the gas mixture. The amount of $\varepsilon$phase in the compound layer increased with increasing $CH_4$ gas content. For $CH_4$ gas content more than 2% in the gas mixture, the thickness of the compound layer decreased due to the formation of $\theta$ phase.

Pyrolytic Conversion of Blended Precursors into Ti-Al-N Ceramic Composites

  • Cheng, Fei;Sugahara, Yoshiyuki;Kuoda, Kazuyuki
    • The Korean Journal of Ceramics
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    • v.6 no.1
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    • pp.32-36
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    • 2000
  • Pyrolytic preparations of Ti-Al-N ceramics from three blended precursors were investigated. The precursors were prepared stirring ($HA1N^{i}Pr_m$ and an aminolysis product of $Ti(NMe_2)_4$ with $MeHNCH_2CH_2$NHMe in $C_6/H_6$ . IR and $^1H\;NMR $analyses suggested that essentially no Ti-N-Al bonds were present in the precursors. Pyrolysis of the precursors under $NH_3-N_2$led to the formation of brown solids with ceramic yields of about 30%, and the Ti-Al ratios in the pyrolyzed products were close to those of the precursors. XRD analysis of the pyrolyzed product from the precursor with Ti:Al=5:1 indicated the formation of a NaCl-type compound as the only crystalline phase. Pyrolysis of the precursor with Ti:Al=2:1 led to the formation of AlN besides the major NaCl-type compound. A ceramic composite containing AlN and the NaCl-type compound was formed by pyrolysis of the precursor with Ti:Al=1:2.

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Studies on the Synthesis of $MoH_2O_2(NCS)_3(C_5H_5N)_2$ ($MoH_2O_2(NCS)_3(C_5H_5N)_2$의 합성에 관한 연구)

  • Q. Won Choi;Jun Suk Oh;Kangwoo Lee
    • Journal of the Korean Chemical Society
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    • v.7 no.2
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    • pp.170-173
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    • 1963
  • A tri-thiocyanate molybdenum (Ⅴ) complex containing pyridine has been prepared by one step process; namely, the solvent extraction of molybdenum (Ⅴ)-thiocyanate complex into organic solvents followed by precipitation of the compound by addition of pyridine to the extract. It is concluded that the compound has a definite composition regardless of the various mole ratios of molybdenum to thiocyanate ion employed in the preparation. The use of hydrazine as the reducing agent eliminates the necessity of working under inert atmosphere and of further purification of the product. Molybdenum (Ⅴ)-thiocyanate (1:3) complex can be quantitatively and selectively extracted with slightly polar organic solvents such as ethyl acetate, and the pyridine complex is quantitatively obtained due to the insolubility of the compound in them. The oxidation state of molybdenum in the compound is + 5 and the formula appears to be $MoH_2O_2(NCS)_3Py_2$ from the contents of Mo and NCS in the compound. The solubility of the compound in various has been studied at $25^{\circ}C$.

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The Photo-reproducibility and Stability of Long Chain Fatty Acid Containing Azobenzene (아조벤젠을 함유한 장쇄 지방산의 광재현성과 안정성에 관한 연구)

  • Par, Keun-Ho;Park, Tae-Gone
    • Journal of the Korean Applied Science and Technology
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    • v.12 no.1
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    • pp.109-114
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    • 1995
  • The Synthesis of long chain fatty acid containing azobenzene and $(C_{n}-Azo)$ was optimized, starting from p-(p'-hydroxy phenyl azo)-benzoic acid and the product of reaction containing azobenzene chromophores was investigated by ultraviolet spectrophotometery in chloroform solvent at the various temperature. In addition, Reversibility and stability of azo compounds have been measured by means of Ultraviolet and the structure of these compound were ascertained by means of FT-IR and NMR. Recrystallization of reaction product in the solvent results the experimental yield obtained about 62.93% p-(p'-octadecyloxy phenyl azo)-benzoic acid. Long chain azobenzene derivatives in chloroform solution are induced photoisomerization by u. v. and visible light irradiation. The solution of long chain fatty acids$(C_{n}-Azo)$ containing azobenzene are possible of being applied to functional molecular devices such as photomemory and light switching.

Olefin Polymerization Activity and Crystal Structure of Alkyliron(Ⅲ) Porphyrin Complexes

  • Oh, Yung-Hee;Swenson, Dale;Goff, Harold M.
    • Bulletin of the Korean Chemical Society
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    • v.24 no.2
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    • pp.167-172
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    • 2003
  • Alkyliron(Ⅲ) porphyrins, n-butyliron(Ⅲ) tetraphenylporphyrin, (TPP)Fe-Bu and n-butyliron(Ⅲ) tetrakis-(pentafluorophenyl)porphyrin, $(F_{20}TPP)Fe-Bu$ have been evaluated as suitable for olefin free-radical polymerization. Butyl radicals dissociated from n-butyliron(Ⅲ) porphyrin initiated the polymerization reaction, but the ratio of the propagation was low. The GCMS analysis of the reaction mixture of nbutyliron(Ⅲ) porphyrin and styrene has revealed several products containing two butyl groups, while traces of b-hydrogen-abstracted products were observed. The crystal structure of (TPP)Fe-Bu has been determined. The structure of the n-butyliron(Ⅲ) porphyrin reveals the compound containing five-coordinated iron with the average Fe-N distance of 1.973(1) Å and Fe-C of 2.030(2) Å. The iron atom is displaced by 0.137Å from a four nitrogen mean plane. Crystal system is triclinic, and space group is P-1.

Synthesis and Surface Relief Gratings of Three-Armed Star-Shaped Molecules Bearing 4-(N,N-Diphenyl)Amino-4'-Nitroazobenzene Chromophores

  • Lee, Jung-Eun;Jung, Kyung-Moon;Cho, Min-Ju;Kim, Kyung-Hwan;Choi, Dong-Hoon
    • Macromolecular Research
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    • v.16 no.5
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    • pp.434-440
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    • 2008
  • Three-armed, star-shaped molecules containing 4-(N,N-diphenyl)amino-4'-nitroazobenzene chromophores were synthesized to study the diffraction behavior after inscribing surface relief gratings. The two molecules differed in terms of their mode of chromophore attachment to the core. In compound 5, they were bound to the core laterally through alkylene spacers, whereas the chromophores were tethered perpendicularly to the core in compound 4. Although 60 wt% of the polar azobenzene chromophores was comprised of large molecules, no aggregation behavior was observed in the absorption spectra of the thin films. The surface relief gratings were elaborated on the surface of the molecular films by the two-beam interference method. The dynamics of grating formation were studied in terms of the diffraction efficiency using two different film samples made up of two star-shaped molecules. The maximum diffraction efficiency of D-$(ENAZ)_3$, compound 4, was measured to be about 30%, which was significantly high. The mode of chromophore attachment affected the dynamic properties of the diffraction gratings.

Synthesis, Spectral Characterization, Electron Microscopic Study and Influence on the Thermal Stability of Phosphorus-containing Dendrimer with a 4,4'-Sulphonyldiphenol at the Core

  • Dadapeer, Echchukattula;Rasheed, Syed;Raju, Chamarthi Naga
    • Bulletin of the Korean Chemical Society
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    • v.32 no.2
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    • pp.498-502
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    • 2011
  • The divergent synthesis of novel phosphorus-containing dendrimer with 4,4'-sulphonyldiphenol at the core has been accomplished involving simple condensation reactions using $P(O)Cl_3$, $P(S)Cl_3$, 3-amino-phenol, 3-hydroxy-benzaldehyde, and 2-butyn 1, 4-diol. The final compound was a Schiff's base macromolecule possessing 4 imine bonds, 8 acetylenic bonds and 8 OH groups at the periphery. The structures of intermediate compounds were confirmed by IR, NMR ($^1H$, $^{13}C$ and $^{31}P$), LC-Mass and C, H, N analysis. The structure of the final dendrimer (5) was confirmed by IR, NMR ($^1H$, $^{13}C$ and $^{31}P$), MALDI-TOF-MS, and C, H, N analysis. The surface morphological characteristics of the final dendrimer were understood by Scanning Electronic Microscopic study (SEM). The thermal stability of the final dendrimer was studied by TGA/DTA analysis.

A Novel Bromoindole Alkaloid from a Korean Colonial Tunicate Didemnum sp.

  • Hahn, Dongyup;Kim, Geum Jin;Choi, Hyukjae;Kang, Heonjoong
    • Natural Product Sciences
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    • v.21 no.4
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    • pp.278-281
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    • 2015
  • Chemical investigation on a colonial marine tunicate, Didemnum sp. led to the isolation of a series of indole alkaloids including a new (1) and two known metabolites (2-3). Based on the spectroscopic analysis including 1D and 2D NMR along with MS spectra, the structure of 1 (16-epi-18-acetyl herdmanine D) was elucidated as a new amino acid derivative. The absolute configuration of 1 was determined by comparison of specific rotation with the known compound. The structures of compounds 2 and 3 were also identified as bromoindole containing compounds N-(6-bromo-1H-indole-3-carbonyl)-L-arginine and (6-bromo-^1H-indol-3-yl) oxoacetamide, respectively, based on $^1H$ and $^{13}C$ NMR data, MS data and specific rotation value. Their pharmacological potentials as antibacterial agents and FXR antagonists were investigated, but no significant activity was found. However, the structural similarity of compound 1 to compound 4 suggested the anti-inflammatory potential of compound 1.