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Air Jet Spinning법을 이용한 PCL/PEO 복합나노섬유 제조 기술
국은지(Eun Ji Kuk),황명구(Myung Goo Hwang),김명근(Myung Geun Kim),김상범(Sang Bum Kim),김연직(Yeon Jig Kim),임재규(Jae Kyoo Lim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study woven PCL by different concentrations using Air Jet Spinning Method(AJS), observed the surface and manufactured nano-fiber under the optimal condition. PCL is cheap with superior processability and lots of studies on it have been conducted as a biodegradable material without any toxicity. In comparison with other biodegradable high molecule, the speed of degradation is slow. So, there are weaknesses that its mainly used for the system of organ drug transfer or has low mechanical characteristics. To improve mechanical characteristics of PCL nano-fiber manufactured by Air Jet Spinning method, nano-fiber was manufactured by blending PEO. PCL/PEO blending nano-fiber showed increased tensile strength and hydrophilicity respectively.
차기철 ( Gi Cheol Cha ),황명구 ( Myoung Goo Hwang ),이명규 ( Myung Gyu Lee ),태민호 ( Min Ho Tae ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.2
A lab-scale Reverse Osmosis(RO) membrane reactor was installed to investigate the membrane permeability, characteristics of membrane fouling at each conditions, and performance of elimination at different trans-membrane pressure(TMP) in the liquid fertilizer accumulated system. Experimental setup was divided to three different TMP conditions. As a result of experiment, permeability of RO membrane was proportional to the increase of TMP and temperature. After experiment was completed, two types chemical cleaning(remove the organic foulant and inorganic foulant) was done, and recover rate of permeability was each 99.8, 99.7 and 99.7%, respectively. From this experimental data, membrane fouling could be determined that the most of it was recoverable in this system, and major reason of fouling was concentration polarization. Elimination rate of solute substance in the liquid fertilizer indicated very stable(above 99%), except ammonia nitrogen, and the most stable elimination rate was investigated at the highest TMP condition (Run 3).