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- 저자 : Zhengzhi Zheng (검색결과 5 건)
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Ning Jia,Bin Yang,Xiaohong Wang,Shishuang Cui,Peng Chen,Ru Xia,Zhengzhi Zheng,Jiasheng Qian,Yuchao Ke,Yang Pan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
In this study, graphene nanoplatelets (GNP) and nickel–cobalt (NiCo) alloy were adopted as reinforcingmaterials to prepare epoxy (EP) resin-based composites. NiCo particles were able to achieve uniformanchoring on GNPs’ surface under the electrostatic force due to the successful introduction of oxygendefects on GNPs. With the synergistic effect of adhesive PVDF and salt particles, the system with threedimensionally(3D) interconnected network was successfully constructed. Benefit from the formation ofmechanically stable and efficient heat conduction paths, the thermal conductivity (TC) of the EP/PVDF/NiCo@GNP composite reached 1.077 Wm1K1 at a filler volume fraction of 6.82 vol%, while the counterpart’sstoragemodulus (E’) was up to 3.22 GPa. In addition, a scaling formula was quantitatively proposed tocorrelate TC with E’, and the perfect agreement between the theoretical prediction and experimental dataclarified the underlying mechanism of the relationship between phonons transport and stress transferwithin a systemwith 3D ordered structures. The establishment of relationship between AHR (average heatingrate) and TC made it possible to further predict TC of composites based upon the infrared thermal imaging(ITI) data. The as-prepared GNP composites show good application prospects as thermal managementmaterials which need to experience thermally mechanical deformation.
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Effect of Microstructure on Thermal Conductivity of Polymer Composites
Yue Yang,Junjie Shu,Peng Chen,Ru Xia,Jiasheng Qian,Bin Yang,JIBIN MIAO,LIFEN SU,Zhengzhi Zheng,Ming Cao 한국고분자학회 2017 Macromolecular Research Vol.25 No.4
Thermal conductivity (TC) of polymer composites is strongly depended on thermal conductive fillers as well as heat conduction pathways formed by these fillers. In this work, we examined effects of morphology, size and arrangement of fillers on TC of polymer composites by using energy-conserving dissipative particle dynamic (e-DPD) simulation. Theoretically, we explored effects of ideal and “pseudo” thermal conductive pathways on composites’ TC and investigated heat conduction of filler particles with cubic-center and lamellar morphology. To confirm orientation and size effects of lamellar filler particles on composites’ TC, we prepared a series of Boron Nitride/Silicon rubber composites (BN/SiR). Being same with those observed in e-DPD simulation, orientation could efficiently improve TC of BN/SiR composites. The TC of composites with filled diameters about 10 micrometer of BN flats is 11 times higher than that of SiR matrix. Our researching results show that heat conduction pathways are essential to transportation of heat flux in polymer composites and even “pseudo” pathways by disconnected filler particles along temperature gradient can accelerate heat conduction.
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Zheng, Zhi,Song, Jin Sook,Lee, Byung Hoi,Ahn, Sung-Hoon,Ahn, Jin-Hee,Woo, JaeChun,Park, Ji-Young,Yoo, Dae Seok,Bae, Myung Ae 3M Company 2014 Journal of Chromatographic Science Vol.52 No.5
<P>2-(3-Benzoyl)-4-hydroxy-1,1-dioxo-2H-1,2-benzothiazine-2-yl-1-phenylethanone (KR-66344), a 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) inhibitor, is newly developed for the control of type 2 diabetes mellitus (T2DM) and metabolic syndrome. A method for the determination of KR-66344 in rat plasma was developed by liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS-MS) to evaluate the pharmacokinetics of KR-66344. Plasma samples were processed by a liquid-liquid extraction method with ethyl acetate and introduced onto the LC-MS-MS system. The analyte and imipramine (internal standard) were analyzed by multiple reaction monitoring based on transitions at m/z 420.1 105.0 and 282.2 86.0, respectively. The calibration curve was linear (r = 0.9993) over the concentration range of 1.0-1,000 ng/mL. The mean recovery values for KR-66344 and imipramine were 83.8 and 86.2%, respectively. The mean inter-day and intra-day assay precision values were 3.9 and 2.4%, respectively. KR-66344 was stable under various handling and storage conditions. This developed method was applied to a pharmacokinetic study after the oral administration of KR-66344 in rats. The concentration of KR-66344 was readily measurable in rat plasma up to 24 h post-dose after an oral administration, suggesting that current assay is applicable to pharmacokinetic studies for KR-66344.</P>
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The Risk of Gastrointestinal Cancer on Daily Intake of Low-Dose BaP in C57BL/6 for 60 Days
Zheng Zhi,Park Jung Kuk,Kwon Oh Wook,Ahn Sung Hoon,Kwon Young Joo,Jiang Linjuan,Zhu Shaohui,Park Byoung Hee 대한의학회 2022 Journal of Korean medical science Vol.37 No.30
Background: Benzo(a)pyrene (BaP) is a carcinogenic compound in contaminated foodstuffs. The effect of oral intake of the environmental carcinogen BaP under low doses and frequent exposure on a digestive system has not been thoroughly verified. Methods: In this regard, this study was conducted to prove the toxicity effects of BaP on the stomach and colon tissue after exposure to C57BL/6 mouse (3 and 6 µg/kg) following daily oral administration for 60 days. This study investigated acute gastric mucosal injury, severe gastric edema, cell infiltration, and mononuclear cells, multifocal cells, and tumoral inflammatory cells. Results: The results of ELISA showed that the expression of serum interleukin (IL)-6 and tumor necrosis factor-α in the BaP exposure group were significantly increased, and a high level of DNA adduct distribution in their stomach and colon. Moreover, this study has confirmed the expression of early carcinogenesis markers: nuclear factor (NF)-κB, p53, IL-6, superoxide dismutase 1 (SOD1), mucin (MUC1 and MUC2), and β-catenin in the stomach and colon, and showed that there was a significant increase in IL-6, NF-κB, SOD1, β-catenin, and MUC1 (P < 0.05). At the same time, there was a significant decrease in MUC2 and p53 (P < 0.05). Thus, even in low doses, oral intake of BaP can induce DNA damage, increasing the potential risk of gastrointestinal cancer. Conclusion: This study will provide a scientific basis for researching environmental contaminated food and intestinal health following daily oral administration of BaP.
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