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silica coating onto graphene for improving thermal conductivity and electrical insulation of graphene/polydimethylsiloxane nanocomposites

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Journal of Materials Science & Technology 2019年第1期35卷 36-43页

作者： Chaoxuan Shen Han Wang Tengxin Zhang You Zeng Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

Graphene possess extremely high thermal conductivity, and they have been regarded as prominent candidates to be used in thermal management of electronic devices. However, addition of graphene inevitably causes dramatic decrease in electrical insulation, which is generally unacceptable for thermal interface materials(TIMs) in real electronic industry. Developing graphene-based nanocomposites with high thermal conductivity and satisfactory electrical insulation is still a challenging issue. In this study,we developed a novel hybrid nanocomposite by incorporating silica-coated graphene nanoplatelets(silica@GNPs) with polydimethylsiloxane(PDMS) matrix. The obtained silica@GNP/PDMS composites showed satisfactory electrical insulation(electrical resistivity of over 10^(13)Ωcm) and high thermal conductivity of 0.497 W m-1K-1, increasing by 155% compared with that of neat PDMS, even higher than that of GNP/PDMS composites. Such high thermal conductivity and satisfactory electrical insulation is mainly attributed to the insulating silica-coating, good compatibility between components, strong interfacial bonding, uniform dispersion, and high-efficiency heat transport pathways. There is great potential for the silica@GNP/PDMS composites to be used as high-performance TIMs in electronic industry.

关键词： Graphene silica coating Nanocomposites Thermal conductivity Electrical insulations

silica Induced Early Fibrogenic Reaction in Lung of Mice Ameliorated by Nyctanthes arbortristis Extract

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Biomedical and Environmental Sciences 2002年第3期15卷 215-222页

作者： BHOLA NATH PAUL ANAND PRAKASH SIRISH KUMAR AJAY KYADAV UMANI ASHOK KSAXENA ANAND PRAKASH SAHU KEWAL LAL KALYAN KDUTTA Immunobiology Laboratory Industrial Toxicology Research CentreM.G.MargLucknow 226001U.P.India Inhalation Toxicology Laboratory Industrial Toxicology Research CentreM.G.MargLucknow 226001U.P.India Preventive Toxicology Laboratory Industrial Toxicology Research CentreM.G.MargLucknow 226001U.P.India

Objective To investigate the pharmacological effect of Nyctanthes arbortristis (NAT) leaf extract in the prevention of lung injury induced by silica particles. Method Lung injury was induced in Swiss mice through inhalation exposure to silica particles (silica increased the level of tumor necrosis factor-a (TNF-a), and of the 66 and 63 kDa peptides in the BAL fluid in comparison to sham-treated control. Pre-treatment of silica exposed mice with NAT leaf extract significantly prevented the accumulation of TNF-a in the BAL fluid, but the 66 and 63 kDa peptides remained unchanged. The extract was also effective in the prevention of silica-induced early fibrogenic reactions like congestion, edema and infiltration of nucleated cells in the interstitial alveolar spaces, and thickening of alveolar septa in mouse lung. Conclusion NAT leaf extract helps in bypassing silica induced initial lung injury in mice.

关键词： Nyctanthes arbortristis Lung-injury silica Mice prevention

Insight on metal ions inducing chiral self-assembly of DNA in silica mineralization

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Nano Research 2023年第3期16卷 3998-4003页

作者： Arepati Azhati Lu Han Zhibei Qu Zhouhong Ren Xi Liu Liwei Chen Shunai Che School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Metal Matrix CompositesShanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240China School of Chemical Science and Engineering Tongji UniversityShanghai 200092China Department of Medicinal Chemistry School of PharmacyFudan UniversityShanghai 201203China School of Chemical Science and Engineering In-situ Center for Physical SciencesFrontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China

The self-assembly of DNA provides an attractive approach to understanding structural formation mechanism in living organisms and to assisting applications in materials ***,we investigated the effect of metal ions on chiral self-assembly of DNA through the synthesis of chiral mesostructured silica via self-assembly of metal ions,DNA,and silica source.31 types of multivalent cationic metal ions were found to induce formation of chiral impeller-like DNA-silica complexes due to the chiral stacking of *** strength of the interaction between the metal ion and phosphate group of DNA was speculated for the chiral stacking of DNA due to close distance of adjacent DNA to assure mutual *** calculations indicated that chiral packing of DNA depends on the stability of the bridging phosphate-metal ion-phosphate bonds of DNA based on electron delocalization in d-orbital conjugation of metal ions.

关键词： chirality DNA DNA-metal ions interaction silica ultra-small metal-nanoparticle

Polymer-free electrospun separator film comprising silica nanofibers and alumina nanoparticles for Li-ion full cell

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Journal of Energy Chemistry 2020年第3期29卷 217-226页

作者： Syed Danish Ali Zaidi Chong Wanga Qinjun Shao Jing Gao Shengdong Zhu Haifeng Yuan Jian Chen Advanced Rechargeable Batteries Laboratory Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023LiaoningChina University of Chinese Academy of Science Beijing 100039China

A separator film for high-performance Li-ion batteries was prepared by electrospinning. The film had a hybrid morphology of silica nanofibers(SNFs) and alumina nanoparticles(ANPs), with a smooth surface, polymer-free composition, high porosity(79%), high electrolyte uptake(876%), and excellent thermal stability. Contact angle measurements demonstrated the better immersion capability of the SNF-ANP separator film for commercial liquid electrolytes than a commercial CELGARD 2500 separator film. Moreover,compared to the commercial CELGARD 2500 separator, the ionic conductivity of the SNF-ANP separator film was nearly three times higher, the bulk resistance was lower at elevated temperature(120 ℃), the interfacial resistance with lithium metal was lower, and the electrochemical window was wider. Full cells were fabricated to determine the cell performance at room temperature. The specific capacity of the full cell with the SNF-ANP separator film was 165 mAh g-1;the cell was stable for 100 charge/discharge cycles and exhibited a capacity retention of 99.9%. Notably, the electrospun SNF-ANP separator film can be safely used in Li-ion or Li-S rechargeable batteries.

关键词： Electrospun nanofiber Hybrid materials Separator film silica nanofiber Li-ion batteries

A New Evaluation Criterion for Optimizing the Mechanical Properties of Toughened Polypropylene/silica Nanocomposites

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Chinese Journal of Polymer Science 2020年第8期38卷 877-887,I0008页

作者： Hossein Pourrahmani Mona Golparvar Mohammad Fasihi Group of Energy Materials (E)cole Polytechnique Fédérale de LausanneSion 1951Switzerland School of Chemical Petroleum and Gas EngineeringIran University of Science and TechnologyTehran 16846-13114Iran School of Mechanical Engineering Braunschweig university of technologyBraunschweig 38106Germany

This study aims to experiment with the mechanical properties of polypropylene(PP)/thermoplastic elastomer/nano-silica/compatibilizer nanocomposite using the melt mixing *** addition of polyolefin elastomers has proved to be an approachable solution for low impact strength of PP,while it would also reduce the Young's modulus and tensile *** is why reinforcement would be applied to this combination to enhance the elastic *** mechanical properties of the prepared composites were devised to train an artificial neural network to predict these properties of the system in 6256 unknown ***,the sensitivity analysis was performed and the share of each input parameter on the respective output values was ***,a novel parameter called nanocomposite evaluation criterion(NEC)is introduced to analyze the suitability of the nanocomposites considering the mechanical ***,the formulation with optimal mechanical properties of toughness,elongation at break,tensile strength,Young's modulus,and impact strength was obtained.

关键词： Nanocomposite Polypropylene(PP) silica Artificial neural networks Nanocomposite evaluation criterion(NEC) Sensitivity analysis

Ultra-small MoS_(2)nanodots-incorporated mesoporous silica nanospheres for pH-sensitive drug delivery and CT imaging

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Journal of Materials Science & Technology 2021年第4期63卷 91-96页

作者： Leilei Chen Jun Xu Yi Wang Rongqin Huang Minhang Hospital and School of Pharmacy Fudan UniversityShanghai201199China Center for Advanced Low-dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai201600China Department of Orthopaedics Minhang HospitalFudan UniversityShanghai201199China

Functionalization of mesoporous silica spheres with well-dispersed and ultra-small nanodots to exert their synergistic effects for biomedical applications has been considered to be an urgent ***,homogeneously incorporation of ultra-small and monodispersed MoS_(2) nanodots in the mesoporous silica nanospheres(MSN)was achieved by a facile one-step solvothermal *** as-synthesized UsMSND@MSN possessed uniform size(~115 nm)and favorable biocompatibility inherited from *** dispersed UsMSND within MSN could act as anchoring sites for aromatic anti-cancer drug DOX loading,and consequently achieved pH-responsive release based on the specialπ-π/electrostatic interactions with the DOX *** importantly,the well-dispersed UsMSND in MSN could function as the non-toxic contrast agent for the sensitive in vivo CT imaging in various tumors including breast cancer and glioma with different *** work promises a good strategy for dispersed incorporation of UsMSND into MSN as an excellent pH-responsive platform for simultaneous cancer imaging and therapy.

关键词： dispersed silica spheres

Biodegradable lubricating mesoporous silica nanoparticles for osteoarthritis therapy

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Friction 2022年第1期10卷 68-79页

作者： Li WAN Yi WANG Xiaolong TAN Yulong SUN Jing LUO Hongyu ZHANG State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China College of Mining Guizhou UniversityGuiyang 550025China Beijing Research Institute of Automation for Machinery Industry Co. Ltd.Beijing 100120China

Osteoarthritis is characterized by lubrication failure of the articular cartilage and severe inflammation of the joint *** mesoporous silica nanoparticles(MSNs)have been developed for the treatment of osteoarthritis based on enhanced lubrication and local drug ***,MSNs are difficult to degrade in vivo in a short time,resulting in potential toxic effect due to *** this study,biodegradable MSNs(bMSNs)were prepared through an oil–water biphase stratification method,and modified with poly(2-methacryloyloxyethyl phosphocholine)(PMPC)to synthesize lubricating drug-loaded nanoparticles(bMSNs–NH_(2)@PMPC)by *** in vitro degradation test demonstrated that the bMSNs and bMSNs–NH_(2)@PMPC almost degraded within 7 *** tribiological test showed that the lubrication property of the bMSNs–NH2@PMPC was greatly improved,with a reduction of 50%in the friction coefficient(COF)compared with the *** was attributed to hydration lubrication mechanism by which a tenacious hydration layer is formed surrounding the zwitterionic headgroups(N+(CH_(3))^(3)and PO4-)in PMPC polyelectrolyte ***,the bMSNs–NH_(2)@PMPC maintained excellent lubrication property under degradation and achieved sustained drug release behavior compared with the *** summary,the biodegradable bMSNs–NH2@PMPC developed in this study with the properties of enhanced lubrication and drug delivery may be a promising approach for osteoarthritis therapy.

关键词： silica hydration property

Ultralow-loss geometric phase and polarization shaping by ultrafast laser writing in silica glass

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Light(Science & Applications) 2020年第1期9卷 1860-1869页

作者： Masaaki Sakakura Yuhao Lei Lei Wang Yan-Hao Yu Peter G.Kazansky Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK

Polarization and geometric phase shaping via a space-variant anisotropy has attracted considerable interest for fabrication of flat optical elements and generation of vector beams with applications in various areas of science and *** the methods for anisotropy patterning,imprinting of self-assembled nanograting structures in silica glass by femtosecond laser writing is promising for the fabrication of space-variant birefringent optics with high thermal and chemical durability and high optical damage ***,a drawback is the optical loss due to the light scattering by nanograting structures,which has limited the ***,we report a new type of ultrafast laser-induced modification in silica glass,which consists of randomly distributed nanopores elongated in the direction perpendicular to the polarization,providing controllable birefringent structures with transmittance as high as 99% in the visible and near-infrared ranges and >90% in the UV range down to 330 *** observed anisotropic nanoporous silica structures are fundamentally different from the femtosecond laser-induced nanogratings and conventional nanoporous silica.A mechanism of nanocavitation via interstitial oxygen generation mediated by multiphoton and avanlanche defect ionization is *** demonstrate ultralow-loss geometrical phase optical elements,including geometrical phase prism and lens,and a vector beam convertor in silica glass.

关键词： polarization silica phase

Kinetics of carbonated decomposition of hydrogarnet with different silica saturation coefficients

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International Journal of Minerals,Metallurgy and Materials 2020年第4期27卷 472-482页

作者： Xiao-feng Zhu Ting-an Zhang Guo-zhi Lü State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Material Science and Engineering Lanzhou University of TechnologyLanzhou 730050China Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education Northeastern UniversityShenyang 110819China Special Metallurgy and Process Engineering Institute School of MetallurgyNortheastern UniversityShenyang 110819China

Carbonated decomposition of hydrogarnet is one of the vital reactions of the calcification–carbonation method,which is designed to dispose of low-grade bauxite and Bayer red mud and is a novel eco-friendly *** this study,the effect of the silica saturation coefficient(x)on the carbonation of hydrogarnet was investigated from the kinetic *** results indicated that the carbonation of hydrogarnets with different x values(x=0.27,0.36,0.70,and 0.73)underwent two stages with significantly different rates,and the kinetic mechanisms of the two stages can be described by the kinetic functions R3 and *** apparent activation energies at Stages 1 and 2 were 41.96–81.64 and 14.80–34.84 kJ/mol,***,the corresponding limiting steps of the two stages were interfacial chemical reaction and diffusion.

关键词： Bayer red mud hydrogarnet calcification carbonation kinetics silica saturation coefficient