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RISS 인기검색어
- 검색키워드
- 저자 : Liwei Mi (검색결과 3 건)
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- 유료
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Pengyu Li,Liwei Mi,Yuanyuan Liu,Wenqin Zhang,Xian-Lei Shi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
A series of monofunctional and bifunctional polyacrylonitrilefiber catalysts have been successfullyprepared to catalyze the decarboxylative Doebner–Knoevenagel reaction of aldehydes and monoethylmalonate for the syntheses of the (E)-α,β-unsaturated esters. Among which, the catalyst PANPDFII/I showsthe best synergistic catalytic activity with high yields (89–96%), stereoselectivities (Z:E > 99:1) andreusability (up to 8 times). The influences of the N position on aminopyridine moiety, solvent andtemperature on the catalytic system were investigated in detail. This catalytic system can process well inhigher or lower polar organic solvents instead of moderate polar solvents, which is an interestingphenomenon in organic catalysis, and the reasons are explained in this work. Furthermore, a DMAP (4-dimethylaminopyridine) and piperazine synergistic catalytic mechanism in the micro-environment ofthefiber catalyst has been conceived to explain the high catalytic performance of this catalytic system. Besides, thefiber catalyst PANPDFII/I shows high application potential in industry for its good performancein scaled-up experiment, as well as its advantages of the easy preparation, high mechanical strength,flexibility and high stability in air.
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최건오,Xiaowu Tang,Rixuan Wang,Kaibin Wu,정용진,안태규,김세현,Liwei Mi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Significant efforts have been devoted to developing dielectric elastomer actuators owing to their mechanicalflexibilities, silent operation, and muscle-like performances. However, it still remains a challenge todemonstrate the actuators that maintain function when subjected to damage because most soft materialsconstituting such devices are vulnerable to mechanical stresses during repeated operation. Here, selfhealableelectrodes suitable for dielectric elastomer actuators were prepared from an eco-friendlygelatin-based composite including conductive ions and hydrogen bonds. Electrohydrodynamic printingwas used to reproducibly fabricate a custom-made electrode with desired geometry. The printedgelatin-based electrodes were attached onto elastomers to fabricate dielectric elastomer actuators. Thedevices exhibited good actuator operation and, owing to the self-healing capability of the gelatinbasedelectrodes, almost fully recovered their performances with an efficiency of up to 96.8% even afterthe electrodes were damaged. Furthermore, the potential application of the gelatin-based electrode wasexplored by using them as a strain sensor; this sensor showed a sensitive dependence of electrical resistanceon external joint movements. We believe this work provides a useful guideline for designing selfhealableconductive composites that can be effectively used to make printed actuators and sensorsendowed with good ionic conductivity and useful mechanical properties.
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Li, Wei,Sun, Ya Nan,Yan, Xi Tao,Yang, Seo Young,Song, Seok Bean,Lee, Young Mi,Kim, Young Ho American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.29
<P>Twelve compounds, including six sucrose fatty acid esters (<B>1</B>–<B>6</B>), four galactosyl acylglycerols (<B>7</B>–<B>10</B>), and two sphingolipids (<B>11</B> and <B>12</B>), were isolated from the roots of Astragalus membranaceus. Their structures were identified on the basis of spectroscopic analysis. Among the isolated sucrose fatty acid esters, 6′-<I>O</I>-linoleyl sucrose (<B>1</B>) was identified as a new compound, and 6′-<I>O</I>-palmitoyl sucrose (<B>2</B>) and 6-<I>O</I>-palmitoyl sucrose (<B>3</B>) were isolated from nature for the first time. This is the first report on sucrose fatty acid ester components from <I>A. membranaceus</I>. The nuclear factor-κB (NF-κB) inhibitory activity of isolated compounds was measured in HepG2 cells stimulated with TNF-α using a luciferase reporter system. Among them, compounds <B>1</B>–<B>6</B> exhibited significant inhibition of NF-κB activation in a dose-dependent manner, with IC<SUB>50</SUB> values ranging from 4.4 to 24.7 μM. Compounds <B>1</B>–<B>6</B> also exhibited inhibition of TNF-α-induced expression of iNOS and ICAM-1 mRNA and dose-dependent inhibition of iNOS promoter activity, with IC<SUB>50</SUB> values ranging from 3.3 to 5.0 μM. These data demonstrate the potential of sucrose fatty acid esters from <I>A. membranaceus</I> to prevent and treat inflammatory diseases.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-29/jf4017509/production/images/medium/jf-2013-017509_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jf4017509'>ACS Electronic Supporting Info</A></P>
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