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다양한 Ca/Al 주입비에서 Ca/Al-Cl LDH 형성에 의한 염소이온 제거 특성
김광덕,송건호,서승우,오상화,김홍태 한국수처리학회 2019 한국수처리학회지 Vol.27 No.4
Chloride removal rate by Ca-Al-Cl LDH precursor with several Ca:Al ratio was investigated. The LDH precursors were made of Ca(OH)2 and NaAlO2 for metal ions with 2 and 3 oxidant numbers, respectively. All experiments were conducted at 250 rpm for 2 hours at Jar Tester. The optimum equivalent ratio of Ca2+ and Al3+ was shown in the range of 2.8 to 4.2 where the maximum concentration (1.63 meq/L) of chloride was removed. The optimal dose of Ca(OH)2 and NaAlO2 to remove the maximum Cl- concentration was also investigated. The total dose of Ca2+ and Al3+ in milli-equivalent base at the optimal Ca2+/Al3+ ratio (3.32 meq/meq) was an important factor for Cl- removal. The Cl- removal was increased while the total dose increased to about 12 where the highest concentration of Cl- was removed by 2.23 meq/L. The solution pH was also depended on the total dose, showing the maximum value at the total dose of 12 meq similar pattern. It indicates that pH can be an important operaing factor for in-situ Cl- removal by Ca/Al-Cl LDH precursor.
김광덕,김성훈,Kim, Kwang-Duk,Kim, Sung-Hoon The Korean Vacuum Society 2009 Applied Science and Convergence Technology Vol.18 No.6
탄소나노필라멘트의 직경크기를 조절하기 위하여 증착 반응초기에 $SF_6$를 증착원료기체($C_2H_2$, $H_2$)에 주입하였다. 증착 원료 기체와 $SF_6$를 열화학기상증착시스템에서 시간에 따라 싸이클릭 유량 변조시켰다. 싸이클릭 유량 변조 프로세스와 기판의 온도에 따라 기판위에 증착된 탄소나노필라멘트들의 특성을 조사하였다. 싸이클릭 에칭기간에 $SF_6$를 투입하자 탄소나노필라멘트의 직경크기는 급격히 감소하였다. 이러한 탄소나노필라멘트 직경의 크기 감소 원인은 $SF_6$ 기체의 주입에 따른 에칭능력 향상에 기인하는 것으로 이해되었다. To control the diameter size of the carbon nanofilaments (CNFs), SF6 was incorporated in the source gases ($C_2H_2/H_2$) during the initial deposition stage. The source gases and $SF_6$ were manipulated as the cyclic on/off modulation of $C_2H_2/H_2/SF_6$ flow in a thermal chemical vapor deposition system. The characteristics of the CNFs formation on the substrate were investigated according to the different cyclic modulation processes and the substrate temperatures. By $SF_6\;+\;H_2$ flow injection during the cycling etching interval time, the diameter size of CNFs was extremely decreased. The cause for the decrease in the diameter size of the individual CNFs by the cyclic on/off modulation process of $C_2H_2/H_2/SF_6$ flow was discussed in association with the slightly enhanced etching ability by the incorporation of $SF_6$.