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Polymeric nanocomposites for electrocaloric refrigeration

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Frontiers in Energy 2023年第4期17卷 450-462页

作者： Yu CAI Qiang LI Feihong DU Jiawang FENG Donglin HAN Shanyu ZHENG Shihao YANG Yingjing ZHANG Binbin YU Junye SHI Xiaoshi QIAN State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai200240China Interdisciplinary Research Center Institute of Refrigeration and CryogenicsSchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Jiao Tong University Zhongguancun Research Institute Liyang213300China

Electrocaloric refrigeration represents an alternative solid-state cooling technology that has the potential to reach the ultimate goal of achieving zero-global-warming potential,highly efficient refrigeration,and heat *** date,both polymeric and inorganic oxides have demonstrated giant electrocaloric effect as well as respective cooling *** both polymeric and inorganic oxides have been identified as promising cooling methods that are distinguishable from the traditional ones,they still pose many challenges to more practical *** an electrocaloric material point of view,electrocaloric nanocomposites may provide a solution to combine the beneficial effects of both organic and inorganic electrocaloric *** article reviews the recent advancements in polymer-based electrocaloric composites and the state-of-the-art cooling devices operating these *** a device point of view,it discusses the existing challenges and potential opportunities of electrocaloric nanocomposites.

关键词： nanocomposites electrocaloric refrigeration polymer

Au(Ⅰ)-BSA nanocomposites with assembling-induced excitation-dependent multicolor emission for dynamic cell imaging

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Science China Chemistry 2023年第1期66卷 174-184页

作者： Xuejuan Wang Guofeng Liu Kuo Fu Xuping Li Mengting Yao Qinghua Lu Liangliang Zhu Xiang Ma Shanghai Key Laboratory of Chemical Assessment and Sustainability Advanced Research Institute School of Chemical Science and EngineeringTongjiUniversityShanghai200092China Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Scienceand TechnologyShanghai 200237China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University Shanghai 200438China

Excitation wavelength dependent(Ex-De) luminescent materials have attracted intense attention due to their great potential in multicolor bioimaging,dynamic anti-counterfeiting,and light emitting ***,it remains a formidable challenge to construct an Ex-De luminescent biomaterial with green starting materials,excellent biocompatibility,good water solubility,and multiple color emission for dynamic cell *** this work,nanocomposites based on the facile self-assembly strategy of bovine serum albumin(BSA) and Au(Ⅰ)-complex are rationally designed and synthesized to simultaneously present Ex-De fluorescence(429–516 nm) and decent phosphorescence(~615 nm) in a dilute aqueous *** analyses of spectroscopic and microscopic results reveal that the luminescent mechanism of Au(Ⅰ)-BSA nanocomposites is cluster-induced Ex-De fluorescence and metal-to-ligand charge transition(MLCT) based ***,based on the excellent biocompatibility,water-solubility and color-tunable emission over the entire visible region(360–800 nm),the Au(Ⅰ)-BSA nanocomposites are successfully used for cell imaging with multiple and switchable colors on *** is more,the solid tablets of Au(Ⅰ)-BSA nanoparticles showed pressure-responsive luminescence and decent room temperature *** work provides an assembling-induced emission strategy for the design of water-soluble,non-cytotoxic,and color-tunable luminescent biomaterials based on the composite of protein and Au nanoparticles.

关键词： nanocomposites excitation wavelength-dependent emission room temperature phosphorescence assembling-induced emission dynamic cell imaging

SYNTHESIS AND CHARACTERIZATION OF POLY(ε-CAPROLACTONE)/Fe_3O_4 nanocomposites BY IN SITU POLYMERIZATION

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Chinese Journal of Polymer Science 2013年第7期31卷 1011-1021页

作者： Guang-shuo Wang Ling Wang 魏志勇 Lin Sang Xu-feng Dong 齐民 Guang-yi Chen Ying Chang Wan-xi Zhang School of Material Science and Engineering Dalian University of Technology Department of Oncology First Affiliated Hospital of Dalian Medical University School of Automotive Engineering Dalian University of Technology

A series of magnetic nanoeomposites based on poly（s-caprolactone）（PCL） and Fe3O4 nanoparticles were prepared using a facile in situ polymerization method. The chemical structures of the PCL/Fe3O4 nanocomposites were characterized by Fourier transform infrared （FTIR） spectroscopy. Results of wide-angle X-ray diffraction （WAXD） showed that the incorporation of the Fe3O4 nanoparticles did not affect the crystallization structure of the PCL. Both scanning electron microscopy （SEM） and transmission electron microscopy （TEM） were used to characterize the morphology and dispersion of the Fe3O4 nanoparticles within the as-synthesized nanocomposites. Results of differential scanning calorimetry （DSC） and polarizing optical microscopy （POM） showed that the crystallization temperature was raised and the spherulites size decreased by the presence of Fe3O4 nanoparticles in the nanocomposites due to the heterogeneous nucleation effect. The thermal stability of the PCL was depressed by incorporation of Fe3O4 nanoparticles from thermogravimetric analysis （TGA）. The superparamagnetic behavior of the PCL/Fe3O4 nanocomposites was testified by the superconducting quantum interference device （SQUID） magnetometer analysis. The obtained biodegradable nanocomposites will have a great potential in magnetic resonance imaging contrast and targeted drug delivery.

关键词： Poly(ε-eaprolactone) Fe3O4 nanocomposites In situ polymerization.

Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount, and size of nanoparticle reinforcements

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Friction 2019年第4期7卷 340-350页

作者： Aleksandar VENCL Ilija BOBIC Biljana BOBIC Kristina JAKIMOVSKA Petr SVOBODA Mara KANDEVA Faculty of Mechanical Engineering University of BelgradeKraljice Marije 16Belgrade 11120Serbia Institute of Nuclear Sciences'Vinca' University of BelgradeMike Petrovica Alasa 12-14Belgrade 11001Serbia Institute of Chemistry Technology and MetallurgyUniversity of BelgradeNjegoseva 12Belgrade 11000Serbia Faculty of Mechanical Engineering in Skopje Ss.Cyril and Methodius UniversityKarposh II bbSkopje 1000Macedonia Faculty of Mechanical Engineering Brno University of TechnologyTechnicka2896/2Brno 61669Czech Republic Faculty of Industrial Technology Technical University of Sofia8 Kliment Ohridski BlvdSofia 1000Bulgaria

Metal matrix nanocomposites(MMnCs)comprise a metal matrix filled with nanosized reinforcements with physical and mechanical properties that are very different from those of the *** ZA-27 alloy-based nanocomposites,the metal matrix provides ductility and toughness,while usually used ceramic reinforcements give high strength and *** ZA-27 alloy-based nanocomposites,reinforced with different types(Si C and Al2O3),amounts(0.2 wt.%,0.3 wt.%,and 0.5 wt.%)and sizes(25 nm,50 nm,and 100 nm)of nanoparticles were produced through the compocasting process with mechanical alloying pre-processing(ball milling).It was previously shown that the presence of nanoparticles in ZA-27 alloy-based nanocomposites led to the formation of a finer structure in the nanocomposites matrix and an improvement in the basic mechanical properties(hardness and compressive yield strength)through the enhanced dislocation density strengthening *** particle erosive wear testing demonstrated that these improvements were followed with an increase in the erosive wear resistance of tested nanocomposites,as ***,by analyzing the influences of type,amount,and size of nanoparticles on the erosive wear resistance of nanocomposites,it was demonstrated that there is an optimal amount of nanoparticles,which in our case is 0.3 wt.%,and that the presence of SiC nanoparticles and smaller nanoparticles in nanocomposites had more beneficial influence on erosive wear resistance.

关键词： ZA-27 alloy nanocomposites nanoparticles compocasting fractography erosive wear

Oxygen Barrier of Multiwalled Carbon Nanotube/Polymethyl Methacrylate nanocomposites Prepared by in situ Method

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Journal of Materials Science & Technology 2012年第5期28卷 391-395页

作者： Ajaya K. Pradhan Sarat K. Swain Department of Chemistry North Orissa University Takatpur Baripada 757003 India Department of Chemistry Veer Surendra Sai University of Technology Burla Sambalpur 768018 India

Multiwalled carbon nanotubes （MWCNTs）/poly（methyl methacrylate）（PMMA） nanocomposites were prepared by ultrasonic assisted emulsifier free emulsion polymerization technique with variable concentration of functionalized carbon nanotubes. MWCNTs were functionalized with H 2 SO 4 and HNO 3 with continuing sonication and polished by H 2 O 2 . The appearance of Fourier transform infrared absorption bands in the PMMA/MWCNT nanocomposites showed that the functionalized MWCNT interacted chemically with PMMA macromolecules. The surface morphology of functionalized MWCNT and PMMA/MWCNT nanocomposites were studied by scanning electron microscopy. The dispersion of MWCNT in PMMA matrix was evidenced by high resolution transmission electron microscopy. The oxygen permeability of PMMA/MWCNT nanocomposites gradually decreased with increasing MWCNT concentrations.

关键词： nanocomposites Morphology Permeability Dispersion

Amorphous Co-B/Al nanocomposites prepared by electroless coating technique and their excellent catalytic activity

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Rare Metals 2010年第1期29卷 32-36页

作者： CHENG Zhipeng XU Jiming ZHONG Hui YANG Yi LI Fengsheng Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials Huaiyin Normal University Huai＇an 223300 China National Special Superfine Powder Engineering Research Center Nanjing University of Science ＆ Technology Nanjing 210094 China

To improve the catalytic activity of amorphous Co-B alloys, Co-B coated aluminum （Co-B/M） nanocomposites were prepared by electroless coating technique and evaluated as additives for the catalytic performance of ammonium perchlorate （AP） and AP-based solid state propellants. X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, inductive coupled plasma emission spectrometry （ICP）, differential scanning calorimetry （DSC） as well as strand burner method were employed to characterize the crystal phase, morphologies, chemical composition, and catalytic activity of the as-synthesized material. The results show that a continuous layer of about 100 nm amorphous Co72.6B27.4 covers the surfaces of M particles. Addition of the as-synthesized Co-B/A1 nanocomposites as catalysts promotes AP decomposition, enhances the burning rate, and lowers the pressure exponent of the AP-based propellants considerably.

关键词： nanocomposites catalysts electroless coating ammonium perchlorate

Mechanical, tribological and heat resistant properties of fluorinated multi-walled carbon nanotube/bismaleimide/cyanate resin nanocomposites

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Journal of Materials Science & Technology 2017年第10期33卷 1182-1186页

作者： Pengbo Li Tiehu Li Hongxia Yan School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China Department of Applied Chemistry. School of Science Northwestern Polytechnical University. Xi'an 710072. China

Bismaleimide containing cyanate resin（BMI/CE） pre-ploymer was used as resin matrix. Fluorinated multiwalled carbon nanotubes（F-MWCNTs） were used as fillers to prepare F-MWCNT/BMI/CE nanocomposites via a solution intercalation method. The influence of F-MWCNT content on the mechanical, tribological and heat resistant properties of the nanocomposites was investigated. The morphology of the fracture surface and the wear surface of nanocomposites were characterized by scanning electron *** show that the addition of F-MWCNTs is beneficial to improving the mechanical and tribological properties of the nanocomposites. It＇s worth noting that when the content of F-MWNTs was 0.6 wt%, the performances of nanocomposite are optimized（i.e., highest impact strength, lowest frictional coefficient and wear rate）. In addition, the nanocomposites exhibit good thermal stability in comparison with BMI/CE.

关键词： Carbon nanotubes nanocomposites Mechanical property Tribological properties Thermal stability

PE/CaCO_3-nanocomposites synthesized by in-situ polymerization

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 987-990页

作者： SCHARLACH Katrin KAMINSKY Walter Department of Chemistry University of Hamburg Bundesstr. 45 Hamburg 20146 Germany

Polyethylene-nanocomposites with CaCO3-weight fractions from 0 to 15 wt.% were prepared by in-situ polymerization with Me2Si（Ind）2ZrC12/MAO metallocene catalysts. A high activity especially in the presence of TIBA was observed. The morphology was investigated by using raster electron microscopy （REM） showing that the CaCO3-nanoparticles are uniformly distributed. The melting temperatures and the crystallization temperatures are not much influenced by increasing filler content.

关键词： nanocomposites CaCO3 Polyethylene Metallocene catalysts

Synthesis and photocatalytic activity of ZnO-Au_(25) nanocomposites

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Science China Chemistry 2016年第3期59卷 277-281页

作者： Junjie Hu Hai Yuan Peng Li Jian Wang Qiankun Liu Hui Wang Qilin Wang Xiaoyou Yuan School of Chemistry and Chemical Engineering Anhui University

ZnO-Au_(25) nanocomposites were synthesized by doping Au_(25) nanoclusters into the porous Zn O nanospheres. It was notable that the ultrasmall Au_(25) nanoclusters possessed uniform sizes and fine dispersibility on the porous ZnO supports. A considerable correlation between the loading of Au_(25) nanoclusters and the photocatalytic activity was found. Compared with the pure ZnO nanospheres, the ZnO-Au_(25) nanocomposites exhibited more efficient photocatalytic activity in terms of degradation of Rhodamine B(RhB) in an aqueous solution. In addition, the possible photocatalytic mechanisms are discussed in this work. This strategy may be helpful for preparing other novel hybrid nanocomposites with well-defined structures and superior performances.

关键词： ZnO-Au25 nanocomposites nanoclusters photocatalysis