• 제목/요약/키워드: Chemical reactions

검색결과 2,724건 처리시간 0.032초

Etching of Al and Cu Solids by $SiCl_4$ Molecules

  • Cho Chul Hee;Lee Woan;Rhee Chang Hwan;Park Seung Chul
    • Bulletin of the Korean Chemical Society
    • /
    • 제13권2호
    • /
    • pp.187-192
    • /
    • 1992
  • The classical trajectory method, previously applied to the reactions of polyatomic molecules with fcc structured metal solids[S. C. Park, C. H. Cho, and C. H. Rhee, Bull. Kor. Chem. Soc., 11, $1(1990)]^1$ is extended to the collision energy dependence of the reaction of the Al solid by $SiCl_4$ molecules. We have calculated etching yields, degrees of anisotropy, kinetic energy distributions, and angular distributions for the reactions of the Al solid and compared with those for the reactions of the Cu solid. Over the range of collision energies we considered, the reactions of the Al soIid show higher etching yield and better anisotropy than the reactions of the Cu solid. Details of reaction mechanisms and the relevance of these calculations for the dry etching of CuAl alloy are discussed.

The coupling Reactions of Alicyclic 1,2-Dihalopolyfluoroolefins with Copper

  • J. D. Park;Robert L. Soulen;Sam Kwon Choi
    • 대한화학회지
    • /
    • 제16권3호
    • /
    • pp.166-177
    • /
    • 1972
  • This paper reports the reaction of monoiodoperfluorocycloakense with alkyl lithium and activated copper repectively resulting in various coupling products. Of particular interests are compounds of the following composition. The physical properties of the various compounds are given along with a discussion relating to the mechanistic pathways involved in the coupling reactions.

  • PDF

Synthesis and Some Reactions of New Thieno[2,3-c]pyridazine Derivatives

  • Bakhite, Etify A.;Mohamed, Omima S.;Radwan, Shaban M.
    • Bulletin of the Korean Chemical Society
    • /
    • 제23권12호
    • /
    • pp.1715-1718
    • /
    • 2002
  • Treatment of ethyl 5-hydroxy-3,4-diphenylthieno[2,3-c]pyridazine-6-carboxylate (1a) with hydrazine hydrate in ethanol gave the carbohydrazide 2,. Some derivatives of the latter compound have been synthesized. Also, 6-acetyl-3,4-diphenyl-5-hydroxythieno[2.3-c]pyridazine (1b) was subjected to some reactions to produce other new thienopyridazine derivatives.

Ozonides from the Ozonolyses of Indene

  • 이강렬;이치원;허태성
    • Bulletin of the Korean Chemical Society
    • /
    • 제20권12호
    • /
    • pp.1437-1440
    • /
    • 1999
  • Ozonolysis reactions of indene 5 in the presence of carbonyl compounds 6 provided the corresponding indenemonoozonide 9 and cross-ozonides 10a-c and 11a-c. Further reactions of ozonides 10 and 11 with the independently prepared carbonyl oxide 13 gave diozonides of structure 14a-c and 15a-c.

전자 흐름에 기초한 기초적인 화학 반응에 관한 대학생들의 이해도 조사 (Investigation of Undergraduate Students' Understanding on Fundamental Chemical Reaction Based on Electron Flow)

  • 이상권;권정균;김경미;박국태
    • 대한화학회지
    • /
    • 제46권3호
    • /
    • pp.279-286
    • /
    • 2002
  • 이 연구의 목적은 대학생들이 유기화학 반응을 전자의 흐름으로 이해하는데 필요한 기초 지식에 대하여 어떤 선개념을 가지고 있으며, 기초적인 화학 반응을 전자의 흐름으로 이해하는 능력은 어느 정도인지 조사하여 교수 학습 방법에 도움을 주고자 하는데 있다. ?見?위해 H 대학교 화학교육과 2학년 18명을 연구 대상으로 선정하였고, 선행연구에서 밝혀진 연구결과를 근거로 하여 예비검사를 거쳐 검사도구를 개발하였다. 개발된 검사도구로 지필검사를 실시하여 대학생들의 응답을 통계처리 하였고, 통계적인 의미를 정성적으로 확인하기 위하여 면담을 실시하였다. 연구 결과, 대학생들의 원자의 전자배치에 대한 개념과 전자의 흐름에 기초하여 화학 반응을 이해하는데 필요한 기본 개념들에 대한 이해도는 높았으나, 이 개념들을 기초적인 화학 반응에 적용시키지는 못하였다. 그러므로 전자의 흐름에 기초하여 화학 반응을 이해하는데 필요한 기본 개념들을 화학 반응에 적용할 수 있게 하는 교수 학습 전략의 개발이 필요하다.

SI 열화학 수소 생산 공정의 분석을 위한 열역학 모델의 적용 (Application of Thermodynamic Models for Analysis on SI Thermochemical Hydrogen Production Process)

  • 이준규;김기섭;박병흥
    • 융복합기술연구소 논문집
    • /
    • 제2권2호
    • /
    • pp.30-34
    • /
    • 2012
  • The SI thermochemical cycle process accomplishes water splitting through distinctive three chemical reactions. We focused on thermodynamic models applicable to the process. Recently, remarkable models based on the assumed ionic species have been developed to describe highly nonideal behavior on the liquid phase reactions. ElecNRTL models with ionic reactions were proposed in order to provide reliable process simulation results for phase equilibrium calculations in Section II and III. In this study, the current thermodynamic models of SI thermochemical cycle process were briefly described and the calculation results of the applied ElecNRTL models for phase equilibrium calculations were illustrated for binary systems.

  • PDF

水銀滴下電極에서 一次反應에 對한 포라로그라프電流에 關한 硏究 (Studies on the Polarographic Kinetic Currents for the First Order Reactions at the Droping Mercury Electrode)

  • 김황암;태창희
    • 대한화학회지
    • /
    • 제6권1호
    • /
    • pp.14-18
    • /
    • 1962
  • Solution to the diffusion layer for the first order reaction at a droping mercury electrode (D.M.E.) is presented. Equations are derived for polarographic currents for the reactions at the D.M.E. A factor which is applicable to the D.M.E. is derived, when we use the equations of the polarographic currents for the reactions at a plane electrode(P.E.), and the rate constants of the backward reactions are negligibly small. Polarographic currents from a combination of diffusions and reactions are obtained at the D.M.E. with special approximation. Rate constant for the reaction of ferrous ion with hydrogen-peroxide is determined at the D.M.E.,using the data of Kolthoff and Perry. The agreement of the equation with the data of Kolthoff and Perry for the kinetic current of ferric ion in the presence of hydrogen-peroxide is good. Ratios of diffusion layer at the D.M.E. to the diffusion layer at the P.E. are discussed and show that, when the rate constants of the backward reactions for the first order reactions are larger than 1/0.05 sec-1. and drop-time about 3 sec., these ratioes are about one.

  • PDF