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비용매 유도 상분리법에 의한 P(AN-co -MA) 비대칭 막의 제조와 특성 평가
유안나 ( An Na Yoo ),염경호 ( Kyung Ho Youm ) 충북대학교 산업과학기술연구소 2015 산업과학기술연구 논문집 Vol.29 No.1
The poly(acrylonitrile-co-methyl acrylate)[P(AN-co-MA)] asymmetric membranes were prepared by non-solvent induced phase separation (NIPS) method, and its membrane filtration performances were studied. The membrane casting solution having the different copolymer concentrations was prepared by directly dissolving P(AN-co-MA) copolymer in DMSO solvent and then appling NIPS method to form the P(AN-co-MA) asymmetric phase inversion membranes. The surface and cross-section SEM images and membrane filtration performances of the P(AN-co-MA) asymmetric membrane were discussed according to the copolymer concentration in casting solution. The P(AN-co-MA) copolymer is appropriate as a membrane making material because FT-IR result shows that P(AN-co-MA) copolymer has the typical component peaks of PAN backbone and hydrophilic carboxyl group. The SEM images of the prepared P(AN-co-MA) membranes show the typical asymmetric membrane structures i.e. porous surface structure and finger-like cross-section structure. The dead-end filtration experiments using pure water and bovine serum albumin (BSA) solution show that a more dense membrane is prepared according as increase of copolymer concentration in casting solution because of the slowed exchange rate between solvent (DMSO) and non-solvent (water) in phase inversion. The prepared P(AN-co-MA) asymmetric membranes are suitable as the ultrafiltration separation membranes.
Yun, Young Soo,Kim, Yu Hyun,Song, Min Yeong,Kim, Na Rae,Ku, Kyojin,An, Ji Su,Kang, Kisuk,Choi, Hyoung Jin,Jin, Hyoung-Joon Elsevier 2016 Journal of Power Sources Vol.331 No.-
<P><B>Abstract</B></P> <P>Nanostructured pyropolymers contain significant amounts of redox-active heteroatoms, have high specific surface areas, and a defective carbon microstructure, indicating good potential for pseudocapacitive charge storage. In this study, nitrogen-enriched pyropolymer nanoparticles (N-PNs-50) are fabricated from polyaniline nanotubes through rapid pyrolysis at 50 °C min<SUP>−1</SUP>. N-PNs-50 exhibit a nitrogen content of 9.8 wt%, a high specific surface area of 875.8 m<SUP>2</SUP> g<SUP>−1</SUP>, and an amorphous carbon structure with an I<SUB> <I>D</I> </SUB>/I<SUB> <I>G</I> </SUB> intensity ratio of 0.95. These unique characteristics lead to good electrochemical performances, in which reversible capacities of 660 and 255 mAh g<SUP>−1</SUP> are achieved for Li-ion and Na-ion storage, respectively, with favorable voltage characteristics (<1.5 V for Li-ions and <1.2 V for Na-ions). This study provides a more feasible production method for nitrogen-doped pyropolymers and their practicable electrochemical performances for use as an anode in energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanostructured pyropolymers (N-PNs-50) were fabricated by rapid pyrolysis. </LI> <LI> N-PNs-50 exhibited a nitrogen content of 9.8 wt% and amorphous carbon structure. </LI> <LI> N-PNs-50 exhibited a high specific surface area of 875.8 m<SUP>2</SUP> g<SUP>−1</SUP>. </LI> <LI> 660 and 255 mAh g<SUP>−1</SUP> were achieved for Li-ion and Na-ion storage, respectively. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Nitrogen-enriched pyropolymer nanoparticles (N-PNs-50) were fabricated from polyaniline nanotubes through rapid pyrolysis at 50 °C min<SUP>−1</SUP>, showing superior electrochemical performances.</P> <P>[DISPLAY OMISSION]</P>
An, Young Jun,Na, Jung-Hyun,Kim, Myung-Il,Cha, Sun-Shin Microbiological Society of Korea 2015 The journal of microbiology Vol.53 No.10
<P>Lon proteases degrade defective or denature proteins as well as some folded proteins for the control of cellular protein quality. There are two types of Lon proteases, LonA and LonB. Each consists of two functional components: a protease component and an ATPase associated with various cellular activities (AAA+ module). Here, we report the 2.03 -resolution crystal structure of the isolated AAA+ module (iAAA+ module) of LonB from Thermococcus onnurineus NA1 (TonLonB). The iAAA+ module, having no bound nucleotide, adopts a conformation virtually identical to the ADP-bound conformation of AAA+ modules in the hexameric structure of TonLonB; this provides insights into the ATP-independent proteolytic activity observed in a LonB protease. Structural comparison of AAA+ modules between LonA and LonB revealed that the AAA+ modules of Lon proteases are separated into two distinct clades depending on their structural features. The AAA+ module of LonB belongs to the -H2 & Ins1 insert clade (HINS clade)- defined for the first time in this study, while the AAA+ module of LonA is a member of the HCLR clade.</P>