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AUC ( Ammonium Uranyl Carbonate ) 의 열분해 및 환원 반응
김영환,유재형 ( Young Hwan Kim,Jae Hyung Yoo ) 한국공업화학회 1997 응용화학 Vol.1 No.1
Block copolymers with poly(tetrametnylene glycol)(PTMG) or poly(ethylene glycol)(PEG) spacers of different length and the 4,4`-(terephthaloyldioxy) dibenzoly unit have been synthesised by interfacial polymerizaiton. Thermal properties were found to be dependent on average length of hard segment as well as of the polyether segment. All copolyesters were elastomeric at room temperature. Thermtopic liquid crystalline behavior was found for all block copolyester and orginated from the hard segment.
김응호,김영환,정동용,신영준,유재형,최청송 ( Eung Ho Kim,Young Hwan Kim,Dong Yong Chung,Young Joon Shin,Jae Hyung Yoo,Cheong Song Choi ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.2
The Kinetics of the decomposition of H₂O₂ in the acidic solution was investigated. The investigation was conducted within the range of HNO₃ concentration of 0-4 M at temperature of 70, 80 and 90℃, respectively. The decomposition reaction is first order with respect to [H₂O₂] and is enhanced by acid-catalytic effect above HNO₃ of 2 M. The rates are as follows; In[H₂O₂]/[H₂O₂]_0= -2.23×10^(10) exp(-18200/RT) ·t ([H^+]<2M) In[H₂O₂]/[H₂O₂]_0=-[2.23×10^(10) exp(-18200/RT)+2.1×10^(12) exp(-21200/RT) ([H^+] -2)] ·t ([H^+]>2M) The effect of UO₂^(+2), Nd^(+3), Pd^(+2), F^(+3), MoO₂^(+2), Sr^(+2), and Cs^+ on the decomposition of H₂O₂ in the solution were examined too, and the rate was compared with that obtained from metal ion-free solution.
김응호,김영환,정동용,유재형 ( Eung Ho Kim,Young Hwan Kim,Dong Yong Chung,Jae Hyung Yoo ) 한국공업화학회 1997 공업화학 Vol.8 No.1
본 연구에서는 질산매질에서 UV 광조사에 의한 옥살산 분해연구가 수행되었다. UV 광원은 2537 의 파장을 방출하는 수은램프가 사용되었다. UV 광조사에도 불구하고 옥살산 자체는 분해되지 않았다. 그러나 질산매질하에서 UV 광조사에 의해 옥살산은 쉽게 분해되었다. UV 광조사에 의해 NO₃-으로부터 발생되는 산소라디칼이 옥살산을 분해시키는 것으로 조사되었다. 옥살산 분해율은 질산 0.5M 부근에서 최대를 이루다가 질산농도 증가에 따라 점차 감소하였다. 이것 역시 산소라디칼과 NO₃- 사이에서 반응으로 쉽게 설명될 수 있다. Decomposition of oxalic acid was studied in nitric acid media by using UV radiations. The UV source is Hg-lamp, emitting 2537 , wavelength. Oxalic acid was not decomposed by itself in spite of UV radiation, but in the presence of nitric acid decomposed easily under UV radiation. It is believed that oxygen radical generated from nitrate ion by UV radiation results in the decomposition of oxalic acid. Decomposition rate of oxalic acid reached a maximum in around 0.5M HNO₃ and then gradually decreased with nitric acid concentration. Thd decrease can be also explained to be due to the reaction between oxygen radical and NO₃-.
김인태,박환서,김환영,유재형,김준형 한국공업화학회 2002 응용화학 Vol.6 No.2
By gelation with sodium silicate and phosphorous oxide in binary system, we investigated the possibility to fix the volatile alkali metal chlorides in a highly stable matrix at high temperature if the product gel is further solidified to form glass or ceramic waste form. The binary system with different metal chloride(MCl) loadings underwent gelation reaction at 70℃ for 1 day and dried at 110℃ for 1 day. XRD analysis showed that all the dried gel contained NaCl and some unknown crystalline phase. From the experimental results, the reaction mechanism can be proposed as follows. Also, the possibility of Cs vaporization could be lowered by the application of the new gel-route stabilization/solidification to treat waste salt. (G,Na)+MCl→(G,M)+NaCl, (G.H)+MCI→(G,M)+HCl.
소석회와 벤토나이트의 첨가가 시멘트 고화매질의 특성에 미치는 영향
김준형,김인태,김환영,박근일,유재형 한국공업화학회 2000 응용화학 Vol.4 No.1
Portland cement has been widely used to stabilize hazardous and radioactive wastes. In spite of its many advantages as a solidification matrix, their mechanical strength and chemical durability (leach resistance) are relatively low. Modification of cement matrix using supercritical CO₂ (SCC) is proposed as a viable method to enhance these properties. In this study, as a pre-step to the SCC modification, cement matrices are fabricated with an addition of slaked lime and Na-bentonite and their characteristics are investigated.
핵종을 흡착한 이온교환수지의 졸-겔반응후 열처리 생성물의 특성
김인태,김환영,박근일,유재형,박환서,김준형 한국공업화학회 2002 응용화학 Vol.6 No.2
New ion exchanger with porous silica as a supporting material and diphosphonic acid as a functional chelating group has been developed for the effective removal of transition metals and actinide ions from radioactive liquid wastes ranging from neutral to very acidic conditions. Thermal treatments of metal (Co, Cs or U) loaded resin after sol-gel reaction with various additives were performed to investigate the possibility of enhancing the physicochemical characteristics and converting the powder waste into a monolithic final waste form. Experimental results showed that addition of Ti could increase the binding force between nuclides and solidification matrix. Moreover, monolithic ceramic waste forms could be easily fabricated by using a hot press unit even at a relatively lower temperature than that of vitrification process.