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JIANG SONGLING,UDDIN MD JAMAL,Xiaoying Yu,Lingjuan Piao,Dorotea Debra,Oh Goo Taeg,Ha Hunjoo 대한당뇨병학회 2022 Diabetes and Metabolism Journal Vol.46 No.6
Background: Non-alcoholic fatty liver disease (NAFLD) has been increasing in association with the epidemic of obesity and diabetes. Peroxisomes are single membrane-enclosed organelles that play a role in the metabolism of lipid and reactive oxygen species. The present study examined the role of peroxisomes in high-fat diet (HFD)-induced NAFLD using fenofibrate, a peroxisome proliferator-activated receptor α (PPARα) agonist.Methods: Eight-week-old male C57BL/6J mice were fed either a normal diet or HFD for 12 weeks, and fenofibrate (50 mg/kg/day) was orally administered along with the initiation of HFD.Results: HFD-induced liver injury as measured by increased alanine aminotransferase, inflammation, oxidative stress, and lipid accumulation was effectively prevented by fenofibrate. Fenofibrate significantly increased the expression of peroxisomal genes and proteins involved in peroxisomal biogenesis and function. HFD-induced attenuation of peroxisomal fatty acid oxidation was also significantly restored by fenofibrate, demonstrating the functional significance of peroxisomal fatty acid oxidation. In <i>Ppara</i> deficient mice, fenofibrate failed to maintain peroxisomal biogenesis and function in HFD-induced liver injury.Conclusion: The present data highlight the importance of PPARα-mediated peroxisomal fitness in the protective effect of fenofibrate against NAFLD.
Jiang, Jianwei,Soo Lim, Young,Park, Sanghyuk,Kim, Sang-Ho,Yoon, Sungho,Piao, Longhai The Royal Society of Chemistry 2017 Nanoscale Vol.9 No.11
<P>A hollow metal micro/nanomaterial with a porous wall is one of the most attractive structures for catalysts. The synthesis of hollow porous Cu particles remains a challenge due to their air-sensitive characteristics. In this study, we report a facile and scalable method for the preparation of high-quality hollow porous Cu particles in the range of 500 nm-1.5 mu m with a well-defined structure from Cu2O nanoparticle aggregates (NPAs). The synthetic procedure involves the silica-encapsulation and depth-controlled reduction of Cu2O NPAs followed by heat-treatment in air and selective removal of the encapsulating layer. The catalytic performance of the hollow porous Cu particles was evaluated through the catalytic reduction of 4-nitrophenol with NaBH4 as a model reaction. The hollow porous Cu particles exhibited a high activity factor, K = 186 s(-1) g(-1), which is the highest K value obtained among the unsupported Cu catalysts to date. And the K value is better than that of some noble metal catalysts, such as Au, Ag, and Pd. In addition, the catalyst could be easily separated from the reaction system and still possessed high activity as well as stability in recycled reactions.</P>
Jiang, J.,Rajendiran, S.,Piao, L.,Yoon, S. Baltzer Science Publishers 2017 Topics in catalysis Vol.60 No.9
<P>Poly (3-hydroxybutyrate) (PHB) is a naturally occurring biodegradable and biocompatible polyester and considered as a class of potentially thermoplastic biopolymers in industry. The alternating copolymerization of cheap and available propylene oxide and carbon monoxide may be an efficient synthetic route for PHB. Here, we studied the base effects on the synthesis of PHB using a well-defined [(salph)Cr(THF)(2)](+)[Co(CO)(4)](-) catalyst combined with various bases. It was found that base not only affects the yield of PHB, but also the molar ratio of each unit in the product.</P>
Photocatalytic degradation of 4‐nitrophenol by using multicomponent Cu 2 O‐Cu@TiO 2 nanoparticl
Jiang Jianwei,문석영,윤성호,Piao Longhai 대한화학회 2024 Bulletin of the Korean Chemical Society Vol.45 No.4
Multicomponent nanomaterials with synergistic effect were typically used to enhance the photocatalytic performance. Herein, three‐component nanomaterials composed of Cu 2 O, Cu, and TiO 2 were prepared using a facile method, and applied in the photocatalytic degradation reactions. The synthetic procedure involves the formation of Cu 2 O nanoparticle aggregates (NPAs) followed by Cu nanoparticles growth on the surface of Cu 2 O NPAs in one pot, and TiO 2 encapsulation (Cu 2 O‐Cu@TiO 2 ). The catalyst structure was characterized by x‐ray diffraction, field emission‐scanning electron microscopy, transmission electron microscopy, and energy‐dispersed x‐ray. The catalytic performance of Cu 2 O‐Cu@TiO 2 NPAs was evaluated through the photocatalytic degradation of 4‐nitrophenol under the simulated solar light. We found that it exhibited greater activity than the Cu 2 O‐Cu NPAs, commercial TiO 2 , and Cu 2 O@TiO 2 NPAs, probably due to their synergistic interactions resulting in the effective photogenerated carrier transfer in the multicomponent nanomaterials. Multicomponent nanomaterials with synergistic effect were typically used to enhance the photocatalytic performance. Herein, three-component nanomaterials composed of Cu2O, Cu, and TiO2 were prepared using a facile method, and applied in the photocatalytic degradation reactions. The synthetic procedure involves the formation of Cu2O nanoparticle aggregates (NPAs) followed by Cu nanoparticles growth on the surface of Cu2O NPAs in one pot, and TiO2 encapsulation (Cu2O-Cu@TiO2). The catalyst structure was characterized by x-ray diffraction, field emission-scanning electron microscopy, transmission electron microscopy, and energy-dispersed x-ray. The catalytic performance of Cu2OCu@ TiO2 NPAs was evaluated through the photocatalytic degradation of 4-nitrophenol under the simulated solar light. We found that it exhibited greater activity than the Cu2O-Cu NPAs, commercial TiO2, and Cu2O@TiO2 NPAs, probably due to their synergistic interactions resulting in the effective photogenerated carrier transfer in the multicomponent nanomaterials.
Jiang, Jianwei,Gunasekar, Gunniya Hariyanandam,Park, Sanghyuk,Kim, Sang-Ho,Yoon, Sungho,Piao, Longhai Elsevier 2018 Materials research bulletin Vol.100 No.-
<P><B>Abstract</B></P> <P>Hierarchical ∼10 nm Cu nanoparticle (NP)-aggregated sub-micro cage catalysts (diameter: ∼800 nm) with a hollow interior and porous shell were prepared from SiO<SUB>2</SUB> encapsulated Cu<SUB>2</SUB>O nanoparticle aggregates (NPAs) using a facile and scalable method. The Cu cages were analyzed by field emission-scanning electron microscopy (FE-SEM), energy-dispersed X-ray (EDX), transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction (SAED), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). Owing to the small primary Cu NPs and characteristic porous shell and hollow interior, the Cu cages showed an extraordinarily high catalytic activity in the reduction of 4-nitrophenol by NaBH<SUB>4</SUB> in aqueous solution. The activity factor (<I>K</I> = 520 s<SUP>−1</SUP> g<SUP>−1</SUP>) is approximately 2.8 times greater than the previous highest <I>K</I> value of unsupported Cu catalysts. In addition, the excellent catalytic activity of the Cu cages in hydrogenation of CO<SUB>2</SUB> to formate, with a TON value of 58 at 200 °C, was comparable to that of various noble metal-supported heterogeneous catalysts and surpassed the vast majority of homogeneous first-row transition metal catalysts.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesizing a challenging structure, hierarchical ∼10 nm Cu NP-aggregated sub-micro cages. </LI> <LI> Cu cages showed an excellent catalytic activity in the reduction of 4-nitrophenol by NaBH<SUB>4</SUB>. </LI> <LI> This is the first report on using a Cu NP-based heterogeneous catalyst for the hydrogenation CO<SUB>2</SUB> to formate. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
High-temperature Adhesion Promoter Based on (3-Glycidoxypropyl) Trimethoxysilane for Cu Paste
Jiang, Jianwei,Koo, Yong Hwan,Kim, Hye Won,Park, Ji Hyun,Kang, Hyun Suk,Lee, Byung Cheol,Kim, Sang-Ho,Song, Hee-Eun,Piao, Longhai Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
To realize copper-based electrode materials for printed electronics applications, it is necessary to improve the adhesion strength between conductive lines and the substrate. Here, we report the preparation of Cu pastes using (3-glycidoxypropyl) trimethoxysilane (GPTMS) prepolymer as an adhesion promoter (AP). The Cu pastes were screen-printed on glass and polyimide (PI) substrates and sintered at high temperatures (> $250^{\circ}C$) under a formic acid/$N_2$ environment. According to the adhesion strengths and electrical conductivities of the sintered Cu films, the optimized Cu paste was composed of 1.0 wt % GPTMS prepolymer, 83.6 wt % Cu powder and 15.4 wt % vehicle. After sintering at $400^{\circ}C$ on a glass substrate and $275^{\circ}C$ on a PI substrate, the Cu films showed the sheet resistances of $10.0m{\Omega}/sq$. and $5.2m{\Omega}/sq$., respectively. Furthermore, the sintered Cu films exhibit excellent adhesion properties according to the results of the ASTM-D3359 standard test.
High-temperature Adhesion Promoter Based on (3-Glycidoxypropyl) Trimethoxysilane for Cu Paste
Jianwei Jiang,구용환,Hye Won Kim,Ji Hyun Park,Hyun Suk Kang,이병철,김상호,송희은,Longhai Piao 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
To realize copper-based electrode materials for printed electronics applications, it is necessary to improve the adhesion strength between conductive lines and the substrate. Here, we report the preparation of Cu pastes using (3-glycidoxypropyl) trimethoxysilane (GPTMS) prepolymer as an adhesion promoter (AP). The Cu pastes were screen-printed on glass and polyimide (PI) substrates and sintered at high temperatures (> 250 oC) under a formic acid/N2 environment. According to the adhesion strengths and electrical conductivities of the sintered Cu films, the optimized Cu paste was composed of 1.0 wt % GPTMS prepolymer, 83.6 wt % Cu powder and 15.4 wt % vehicle. After sintering at 400 oC on a glass substrate and 275 oC on a PI substrate, the Cu films showed the sheet resistances of 10.0 mΩ/sq. and 5.2 mΩ/sq., respectively. Furthermore, the sintered Cu films exhibit excellent adhesion properties according to the results of the ASTM-D3359 standard test.