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Emulsion - Drying Method 를 이용한 ZnO 미세 분말의 합성
이철태,김홍철,김현중,노광철 한국공업화학회 1999 응용화학 Vol.3 No.2
ZnO was synthesized by using emulsion-drying method. Emulsion made by mixed solution with sulfantant(span80) and extract catalyst(D₂EHPA). ZnO precursor was prepared by emulsion breaking method of Zn containing emulsion. We have two types of Zn rich solution one is made from ZnSO₄·7H₂O solution and the other leached solution from wastes(EAF dust). From the results of SEM and particle analyser, synthesized powder was fine, homogenious distribution and spherical form.
활성탄 종류 및 특성이 수용성계 supercapacitor 전극 특성에 미치는 영향
이철태,김홍철,김현중,송연호 한국공업화학회 1998 응용화학 Vol.2 No.1
Activated carbon is an important material for use in electrochemical supercapacitor that depend on charge storage in the electrode/electrolyte intefacial double layer and electrode property. The purpose of this study is to review the application of activated carbon as supercapacitor electrode in aqueous electrolyte.
폐유리로부터 발포유리 제조를 위한 유리의 물리적 특성에 관한 연구
이철태,오치훈,김홍철,김현중,엄동식 한국공업화학회 1999 응용화학 Vol.3 No.1
This study was production of such form glass. Process for the preparation of form glass was developed and its physical and chemical characteristics was examined. The foam glass sample had density of 0.18±0.029g/㎠, thermal conductivity of 0.048±0.002 kcal/hm℃, absorption rate of 0.2±0.01vol%, linear expansion coefficiant of (8.8±0.2)×10^(-6)m/m℃ (400℃), bending strength of 1.712N/㎟ and compress sibility 3831N/㎟.
Ilmenite와 황산암모늄의 反應을 이용한 Ti 및 Fe성분의 추출
李鐵泰,李鴻吉,金東烈,朴容成 단국대학교 1988 論文集 Vol.22 No.-
The sulfating of ilmenite with (NH_4)_2SO_4 was investigated in order to find the possibility of (NH_4)_2SO_4 being an alternative sulfating source and a new process for the extraction of Ti and Fe components from ilmenite to produce synthetic rutile. The proper conditions for the sulfating of ilmenite in the boat-batch system under the nitrogen gas atmospher were that reaction tempperaure 400℃, (NH_4)_2SO_4 weight ratio to ilmenite 11.0, reaction time 3h and paricle size of ilmenite -250mesh. Under above mentioned conditions, 99.8% Fe and 95.5% Ti in ilmenite were converted to water soluble metal sulface or ammonium metal sulfate.
김태진,이철태,김홍철,김현중,김정래 한국공업화학회 1999 응용화학 Vol.3 No.2
The purpose of this study was to prepare pelletized activated carbon by steam activation method using leftover waste lumber which was obtained in woodland. The properties of pelletized activated carbon prepared by experiments were compared with that of KS rule of granulated activated carbon. The properties of hardness, iodine adsorptive power and packing density were above 95%, over 1100㎎/g, and below 0.4g/㎖ respectively. The result of this experimental study was showed a good agreement with first grade of KS rule of granulated activated carbon.
김원배,이철태,유영홍,박용성 한국화학공학회 1985 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.23 No.6
원소상 황의 새로운 황화제로서의 사용가능성을 조사하고자 탄소존재하에서 원소상 황과 함티탄자철광의 반응을 시도하였다. 반응변수로서는 황분압, 반응온도, 함티탄자철광에 대한 탄소첨가량의 무게비, 반응시간, 함티탄자철광의 입도등이 선정되었으며 검토결과 본 황화반응의 적정 조건은 황분압 0.2atm., 반응온도 800℃, 함티탄자철광에 대한 첨가탄소량의 무게비 0.7, 반응시간 90분, 함티탄자철광의 입도 0-150mesh였다. 위 조건에서 얻엉진 황화반응생성물을 1M HCl로 침출한 후 얻은 잔사의 TiO₂ 함량은 78.48%였다. The reactions in the carbon-elemental sulfur-titaniferous magnetite system were investigated in order to find the possibility of elemental sulfur being an alternative sulfidization agent. The study of this reaction included reaction variables such as partial ptessure of sulfur, reaction temperature, weight ratio of added carbon to titaniferous magnetite, reaction time, and particle size of titaniferous magnetite. The proper conditions for this sulfidization were that partial pressure of sulfur 0.2 atm., reaction temperature 800℃, weight ratio of added carbon to titaniferous magnetite 0.7, reaction time 90min., and particle size of titaniferous magnetite under 150 mesh. The content of TiO₂ of residue obtained by leaching the sulfidized product with 1M HCl was 78.48%.
Emulsion 을 이용한 LiNi0.5Co0.5O2 정극활물질의 제조 및 전기화학적 특성
고영옥,이철태,오치훈,김홍철,김현중,엄의흠 한국공업화학회 2000 응용화학 Vol.4 No.1
LiNi_(0.5)Co_(0.5)O₂ powder as a positive electrode material for lithium-ion batteries is systhesized by the emulsion method. LiOH·H₂O, Ni(CH₃COO)₂·4H₂O and Co(CH₃COO)₂·4H₂O aqueous solution, kerosene, and span-80 are used as aqueous phase, oil phase and emulsifying agent. Weight loss of the precursor powder occurs rapidly below 400℃ and the formation of LiNi_(0.5)Co_(0.5)O₂ phase is starting. The heating condition for obtaining pure LiNi_(0.5)Co_(0.5)O₂ phase is above 750℃ for 12hr. Obtained powder shows very uniformly size distribution around l0㎛, and good electrochemical characteristics.
리튬이차전지용 정극활물질 LiNi1-xCoxO2 의 제조 공정에 따른 전기화학적 특성
고영욱,김현중,이철태,김홍철,엄의흠 한국공업화학회 2000 응용화학 Vol.4 No.2
To improve the electrochemical characteristics of positive electrode in lithium secondary battery, synthesized LiNi_(1-x)Co_xO₂ by sol-gel method and emulsion-drying method. The optimal synthesis conditions and the electrochemical characteristics of LiNi_(1-x)Co_xO₂ with variation of x were studied. Synthesized by sol-gel and emulsion-drying method at the optimal conditions, the hexagonal lattice parameter c increased with increasement of x. Therefore, Ni rich samples showed good cycle-life characteristics and high coulomb efficiency than Co rich samples and Co rich samples showed higher initial discharge capacity than Ni rich sample.