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- 저자 : Zhong-yu Si (검색결과 4 건)
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Zhong-yu Si,Zhong-xiao Sun,Lianwei Ye,Ai-jun Gao,Yu Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
In recent years, with the increasing demand for carbon fiber-reinforced polymer (CFRP), the recycling of its wastehas become a serious problem that restricts the wider application of CFRP. This study used a benzyl alcohol/NaOH system atatmospheric pressure to degrade the CFRP of epoxy-resin matrix cured by anhydride, and the influence of NaOH dosage ondegradation rate was investigated. The degradation mechanism of the resin was analyzed using Fourier transform infraredspectroscopy, gas chromatography-mass spectrometry and Electro-Spray Ionization-Mass Spectroscopy. The structure andproperties of the recycled carbon fibers were characterized using scanning electron microscopy, X-ray photoelectronspectroscopy and a monofilament tensile strength test. The experimental results indicated that the benzyloxy nucleophilicgroup produced by benzyl alcohol in alkaline conditions selectively attacked the cross-linking ester bond of the resin andbroke the c ross-linking point. Finally, the resin was degraded by removing the curing agent. When the m ass ratio of NaOH toCFRP (w(NaOH):w(CFRP)) was not under 1:1 and the reaction conditions were 190 °C, 1 h and atmospheric pressure, thedegradation rate of the resin reached 98.4 %. The degradation products of the resin were insoluble in benzyl alcohol andprecipitated, which was conducive to the recovery and reuse of the benzyl alcohol. The surface oxygen content of therecycled carbon fiber was similar to that of the original carbon fiber, and the tensile strength of recycled carbon fibermonofilament remained above 95 % of the original.
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Ho, Ping-Luen,Yu, Chu-Ping,Zhang, Qiqi,Song, Kyung,Buban, James P.,Choi, Si-Young,Dunin-Borkowski, Rafal E.,Mayer, Joachim,Tai, Nyan-Hwa,Zhu, Jing,Jin, Lei,Zhong, Xiaoyan Elsevier 2018 Ultramicroscopy Vol.193 No.-
<P><B>Abstract</B></P> <P>Superexchange-based magnetic coupling of the two <I>B</I>-site cations in rock-salt-ordered double perovskite oxides is extremely sensitive to the cation ratio and degree of order. However, as a result of the limited spatial resolution of most magnetic characterization techniques, it is challenging to establish a direct relationship between magnetic properties and structure in these materials, including the effects of elemental segregation and cation disorder. Here, we use electron energy-loss magnetic chiral dichroism together with aberration-corrected electron microscopy and spectroscopy to record magnetic circular dichroism (MCD) spectra at the nm scale, in combination with structural and chemical information at the atomic scale from the very same region. We study nanoscale phases in ordered Sr<SUB>2</SUB>[Fe][Re]O<SUB>6</SUB>, ordered Sr<SUB>2</SUB>[Fe][Fe<SUB>1/5</SUB>Re<SUB>4/5</SUB>]O<SUB>6</SUB> and disordered Sr[Fe<SUB>4/5</SUB>Re<SUB>1/5</SUB>]O<SUB>3</SUB> individually, in order to understand the role of cation ratio and order on local magnetic coupling. When compared with ordered Sr<SUB>2</SUB>[Fe][Re]O<SUB>6</SUB>, we find that antiferromagnetic Fe<SUP>3+</SUP>-O<SUP>2−</SUP>-Fe<SUP>3+</SUP>superexchange interactions arising from an excess of Fe suppress the MCD signal from Fe cations in ordered Sr<SUB>2</SUB>[Fe][Fe<SUB>1/5</SUB>Re<SUB>4/5</SUB>]O<SUB>6</SUB>, while dominant Fe<SUP>3+</SUP>-O<SUP>2−</SUP>-Fe<SUP>3+</SUP>antiferromagnetic coupling in disordered Sr[Fe<SUB>4/5</SUB>Re<SUB>1/5</SUB>]O<SUB>3</SUB> leads to a decrease in MCD signal down to the noise level. Our work demonstrates a protocol that can be used to correlate crystallographic, electronic and magnetic information in materials such as Sr<SUB>2</SUB>Fe<SUB>1+</SUB> <I> <SUB>x</SUB> </I>Re<SUB>1-</SUB> <I> <SUB>x</SUB> </I>O<SUB>6</SUB>, in order to provide insight into structure-property relationships in double perovskite oxides at the atomic scale.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Local measurements of magnetic circular dichroism, atomic arrangement, cation order, chemical state and elemental distribution from the very same region provide an improved understanding of structure-property relationships at the nm scale in double perovskites with different structural complexities. </LI> <LI> Antiferromagnetic Fe<SUP>3+</SUP>-O<SUP>2−</SUP>-Fe<SUP>3+</SUP>superexchange interactions arising from an excess of Fe suppress the magnetic circular dichroism signal from Fe cations in ordered Sr<SUB>2</SUB>[Fe][Fe<SUB>1/5</SUB>Re<SUB>4/5</SUB>]O<SUB>6</SUB>, when compared with ordered Sr<SUB>2</SUB>[Fe][Re]O<SUB>6</SUB>. </LI> <LI> Dominant Fe<SUP>3+</SUP>-O<SUP>2−</SUP>-Fe<SUP>3+</SUP>antiferromagnetic coupling in disordered Sr[Fe<SUB>4/5</SUB>Re<SUB>1/5</SUB>]O<SUB>3</SUB> leads to a decrease in magnetic circular dichroism signal down to the noise level. </LI> </UL> </P>
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Fan, Fang-Tian,Shen, Cun-Si,Tao, Li,Tian, Chao,Liu, Zhao-Guo,Zhu, Zhi-Jie,Liu, Yu-Ping,Pei, Chang-Song,Wu, Hong-Yan,Zhang, Lei,Wang, Ai-Yun,Zheng, Shi-Zhong,Huang, Shi-Le,Lu, Yin Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.5
Pyruvate kinase isozyme type M2 (PKM2) was first found in hepatocellular carcinoma (HCC), and its expression has been thought to correlate with prognosis. A large number of studies have demonstrated that epithelial-mesenchymal transition (EMT) is a crucial event in hepatocellular carcinoma (HCC) and associated metastasis, resulting in enhanced malignancy of HCC. However, the roles of PKM2 in HCC EMT and metastasis remain largely unknown. The present study aimed to determine the effects of PKM2 in EGF-induced HCC EMT and elucidate the molecular mechanisms in vitro. Our results showed that EGF promoted EMT in HCC cell lines as evidenced by altered morphology, expression of EMT-associated markers, and enhanced invasion capacity. Furthermore, the present study also revealed that nuclear translocation of PKM2, which is regulated by the ERK pathway, regulated ${\beta}$-catenin-TCF/LEF-1 transcriptional activity and associated EMT in HCC cell lines. These discoveries provide evidence of novel roles of PKM2 in the progression of HCC and potential therapeutic target for advanced cases.
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Quan, Shi-Li,Kang, Soon-Gon,Qiu, Zhi-Cheng,Chen, Si-Chong,Yang, Ke-Ke,Wang, Yu-Zhong,Chin, In-Joo American Scientific Publishers 2011 Journal of nanoscience and nanotechnology Vol.11 No.2
<P>PPDO was successfully electrospun into continuous, ultrafine fibers by using DMSO as solvent for the first time. The concentration of PPDO in DMSO and the electrospinning temperature were optimized. PPDO/LAP nanocomposites were also electrospun in DMSO. At 70 degrees C, ultrafine PPDO fibers were obtained from 35 wt% solution and the PPDO/LAP nanocomposite fibers were yielded from 55 wt% solution. Electrospun fibers of the PPDO/LAP nanocomposites showed higher degree of crystallinity due to the presence of embedded nanoparticles.</P>
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