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김수연 ( Kim Su Yeon ),김광주 ( Kim Gwang Ju ),유승곤 ( Yu Seung Gon ) 한국공업화학회 2004 공업화학 Vol.15 No.3
종을 이용한 냉각 결정화에 의하여 물-인산 계로부터 인산의 결정화가 연구되었다. 결정화 시간에 따라 평균입경, 입도분포, 전체 결정 개수를 on-line 분석하여 인산 결정화의 메커니즘이 조사되었다. 준안정영역 넓이에 대한 인산 종결정 농도, 냉각속도의 영향이 조사되었다. 인산의 결정화에서 핵생성 속도는 과포화도의 3.54승에 비례하였다. 종 결정 농도가 증가함에 따라 준안정영역넓이는 감소하였으며 냉각속도가 증가함에 따라 준안정영역넓이는 증가하였다. Mersmann에 의한 핵생성 판단기준으로부터 인산-물계의 핵생성은 이차핵생성으로서 핵생성이 지배적으로 일어났다. 회분식 결정화에서 결정성장속도는 과포화도의 3.16승에 의존하였으며 two-step model로부터 부피확산과 표면축적에 의해 결정성장이 일어나는 것으로 판단된다. Phosphoric acid was crystallized by seeding in a batch crystallizer under various operating conditions. Nucleation and crystal growth kinetics of phosphoric acid in water were explored in seeded cooling crystallization. The effects of seed concentration, cooling rate on the metastable zone width in crystallization of phosphoric acid in aqueous solution were studied. The metastable zone width increased with decreasing the amount of seed and increasing the cooling rate. The order of nucleation of phosphoric acid in solution was found to be 3.51. Surface nucleation was dominated in phosphoric acid-water system via Mersmann`s nucleation criterion. The order of growth for phosphoric acid hydrate with respect to supersaturation was found to be 3.16. The crystal growth of phosphoric acid was controlled by the mechanisms combined with volume diffusion and surface integration.
박환서,김인태,김환영,유승곤,김준형,Park Hwan Seo,Kim In Tae,Kim Hwan Young,Ryu Seung Kon,Kim Joon Hyung 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.1
This study suggested a new method for the solidification of molten salt waste generated from the electro-metallurgical process in the spent fuel treatment. Using binary material system, sodium silicate and phosphoric acid, metal chlorides were converted into metal phosphate in the micro-reaction module formed by SiO$_{2} particles. The volatile element in the reaction module would little vaporized below 1100$^{circ}$C After the gel product was mixed with borosilicate glass powder and thermally treated at 1000$^{circ}$C, li exists as Li$_{3}$PO$_4$ separated from glass phase and, Cs and Sr would be incorporated into an amorphous phase from XRD analysis. In case of the addition of ZrCl$_{4}$ to the binary system, the gel products were transformed into NZP structure considered as an prospective ceramic waste form after heat-treatment above 700 $^{circ}$C. From these results, the gel-route pretreatment can be considered as an effective approach to the solidincation of molten salt waste by the confirmed process or waste form and this also would be an alternative method on the ANL method using zeolites in USA by the confirmation of its chemical durability as an future work.
Measuring electrical resistances of ACF sensors by CO2 adsorption in a small chamber
Kim Dae Wan,곽이규,김홍근,유승곤 한국탄소학회 2022 Carbon Letters Vol.32 No.1
The electrical resistances of small-sized activated carbon fiber (ACF) fabric (specific surface area: 1244.7 m2/g, average pore diameter: 1.92 nm) and felt (specific surface area: 1321.2 m2/g, average pore diameter: 2.21 nm) sensors were measured in a temperature and humidity controlled gas chamber by CO2 adsorption at different surrounding CO2 concentrations (3000–10,000 ppm). The electrical resistances of ACF sensors decreased linearly as the increase of temperature and decreased exponentially as the increase of humidity in the ambient atmospheric chamber. The electrical resistances of ACF rapidly decreased within 4 s and an equilibrium state was achieved within 10 s due to the very rapid CO2 adsorption at room temperature and 40% humidity. Comparing the difference in electrical resistance values measured during injection of similar concentrations of CO2 after reaching the equilibrium value, the fabric exhibited a significant change, whereas the felt did not, even though it had a relatively larger specific surface area. The reason is that micropore volume greatly affected the amount of CO2 adsorbed, whereas the specific surface area did not affect it as much. Therefore, ACF fabric with large micropores (> 2.0 nm) can be developed and used as CO2 sensors in small rooms such as a passenger vehicles.
김병섭,유승곤,최성열,Kim, Byeong-Seop,Yu, Seung-Gon,Choe, Seong-Yeol 한국방위산업진흥회 2002 國防과 技術 Vol.- No.276
이 글은 최근에 개발되어 큰 관심을 모으고 있는 흡착성능이 대단히 우수하고 가벼운 활성탄소섬유(ACF 혹은 섬유상 활성탄소)에 유기인 화합물 신경작용제의 모델가스인 DMMP를 통과시켜 흡착 파과곡선을 측정하고 방독면과 보호와의 핵심소재인 첨착활성탄소(ASC-AC)와 제거능력을 비교하면서, ACF가 현재 사용되고 있는 독성가스 제거용 첨착활성탄소를 대체할 수 있는 가능성을 보고자 하였다.