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RISS 인기검색어
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- 저자 : Hangyu Zhang (검색결과 3 건)
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The Transition of Molecular Alignment of Poly(ethylene oxide) Film via Thermal Annealing
Hangyu Zhang,Guangzhu Ding,Kun Wu,Chenguang Cai,Jieping Liu 한국고분자학회 2022 Macromolecular Research Vol.30 No.4
The molecular alignment of polymer film has attracted a lot of attentions due to its complicated process affected by processing conditions and dominating polymer applications. Here we demonstrate that the annealing process can not only change the surface morphology of annealed poly(ethylene oxide) (PEO) film significantly but also induce the formation of highly oriented lamellar structure. It indicates that sheaf-like and cluster banding morphology can be both found obviously on the surface of pristine film. However, there is only sheaf-like morphology and sporadical cluster banding cannot be found obviously on the surface of annealed film. Then, there are both tilt and flat-on orientations of PEO crystalline for pristine film. But, single flat-on orientation of PEO crystalline is present and tilt orientation mode is absent for annealed films. Furthermore, the transition of molecular alignment of PEO film via thermal annealing cannot be affected by the thickness and temperature.
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Shida Li,Xueyu Zhang,Shaokui Zheng,Shoupeng Duan,Jun Cui,Hangyu Zhang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
This study systematically investigated the inhibition mechanism of NaHCO3 for mild steel corrosion in a0.02 M naturally aerated NaCl solution at 40 C (simulating cooling water) and the critical bicarbonate/chloride molar ratio (RC) using visual observations, potentiodynamic polarization curves, andelectrochemical impedance spectroscopy. The corrosion mechanism of an anodic passivefilm formedwith 0.20–0.40 M NaHCO3 (RC = 10) was controlled by a combination of passivation, diffusion, and chargetransfer processes. Electrochemical impedance spectroscopy results showed that, compared to 0.20–0.24 M NaHCO3, a higher NaHCO3 concentration may affect the stability of the passivefilm. A higherchloride concentration of 0.08 M achieved by a higher concentration cycle in the cooling water systemresulted in a lower RC value of 7.5 for NaHCO3. Both NaHCO3 and Na2CO3 showed an identical corrosionmechanism; moreover, the inhibitory effect of Na2CO3 was not dependent on its alkaline pH. Takentogether, thesefindings show the remarkable potential of NaHCO3/Na2CO3 as a commercially available,comparatively cheap, and environmentally acceptable (i.e., no organic pollution, toxicity, oreutrophication risks after discharge) corrosion inhibitor for mild steel in cooling water systems.
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Mao Minghuan,Yang Liang,Hu Jingyao,Liu Bing,Zhang Xiling,Liu Yili,Wang Ping,Li Hangyu 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
The neuronally expressed developmentally downregulated 4 (NEDD4) gene encodes a ubiquitin ligase that targets the epithelial sodium channel for degradation and has been implicated in tumor growth in various cancers. Hence, in this study, we intended to characterize the functional relevance of the NEDD4-mediated Kruppel-like factor 8/microRNA-132/nuclear factor E2-related factor 2 (KLF8/miR-132/NRF2) axis in the development of bladder cancer. NEDD4 and KLF8 were overexpressed in bladder cancer tissues and were associated with poorer patient survival rates. In bladder cancer cells, NEDD4 intensified the stability and transcriptional activity of KLF8 through ubiquitination to augment cell viability and migratory ability. Our investigations revealed that NEDD4 promotes the binding of KLF8 to the miR-132 promoter region and inhibits the expression of miR-132. KLF8 inhibited the expression of miR-132 to augment the viability and migratory ability of bladder cancer cells. Furthermore, miR-132 downregulated the expression of NRF2 to restrict the viability and migratory ability of bladder cancer cells. In addition, in vivo findings verified that NEDD4 regulates the KLF8/miR-132/NRF2 axis by accelerating tumor growth and lung metastasis. In conclusion, this study highlights NEDD4 as a potential therapeutic target against tumor recurrence and metastasis in bladder cancer.
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