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On the higher-order thermal vibrations of FG saturated porous cylindrical micro-shells integrated with nanocomposite skins in viscoelastic medium

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Defence Technology（防务技术） 2022年第8期18卷 1416-1434页

作者： Zeinab Soleimani-Javid Ehsan Arshid Saeed Amir Mahdi Bodaghi Department of Solid Mechanics Faculty of Mechanical EngineeringUniversity of KashanKashanIran Department of Engineering School of Science and TechnologyNottingham Trent UniversityNottinghamNG118NSUK

Since the multi-layered structures are widely used nowadays, and due to interesting applications of cylindrical shells, this study is dedicated to analyzing free vibrational behaviors of functionally graded saturated porous micro cylindrical shells with two nanocomposite skins. Based on Biot's assumptions, constitutive relations for the core are presented and effective properties of the skins are determined via the rule of mixture. A sinusoidal theory is used to capture the shear deformation effects, and to account for the scale effects, the modified couple stress theory is employed which suggests a material length-scale parameter for predicting the results in small-dimension. With the aid of extended form of Hamilton's principle for dynamic systems, differential equations of motion are extracted. Fourier series functions are used to obtain natural frequencies and after validating them, a set of parametric studies are carried out. The results show the significant effects of porosity and Skempton coefficient, pores placement patterns, CNTs addition and distribution patterns, temperature variations, material length-scale parameter and viscoelastic medium on the natural frequencies of the microstructure. The outcomes of this work could be used to design and manufacture more reliable micro cylindrical structures in thermo-dynamical environments.

关键词： Vibration analysis Cylindrical shells Saturate porous materials nanocomposite materials Carbon nanotubes Sinusoidal shear deformation theory Viscoelastic medium

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Titanate Nanorods Modified with Nanocrystalline ZnS Particles and Their Photocatalytic Activity on Pollutant Removal

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Journal of materials Science & Technology 2016年第11期32卷 1122-1128页

作者： G.Naudin T.Entradas B.Barrocas O.C.Monteiro Faculte de Chimie Universite Pierre et Marie Curie (UPMC) Batiment F 3e etage 4 placeJussieu 75005 Paris France Centro de Quimica e Bioquimica Faculdade de Ciencias Universidade de Lisboa 1749-016 Lisboa Portugal

Aiming to produce materials with enhanced photocatalytic properties, the synthesis of new crystalline nanocomposites by combining titanate nanorods（TNR） with ZnS nanocrystallites is described in this *** TNR modification was accomplished by an in situ nucleation and growth process of ZnS *** diethyldithiocarbamate was used as the metal chalcogenide precursor. The prepared materials were structural, morphological and optical characterized by X-ray diffraction, transmission electron microscopy and high resolution transmission electron microscopy, energy dispersive spectroscopy and powder diffuse reflectance spectra. Crystalline Zn S nanoparticles were obtained as a homogeneous and continuous layer, covering completely the TNR surface. The application of these new nanocomposite materials on photocatalytic degradation of pollutants was investigated. First, the evaluation of hydroxyl radical formation, using the terephthalic acid as probe, was studied. Afterwards, the adsorption and photodegradation of safranine-T, used here as a model pollutant molecule, was investigated. The obtained data indicate that the prepared nanocomposites have potential to be used as photocatalysts for organic pollutant *** best removal results（97% removal） were obtained using the 0.01 Zn S/HTNR sample as catalyst（0.2 g/L; 10 ppm safranin-T solution） with a combination of a low dye adsorption（20%） and a high dye photocatalytic degradation（77%）.

关键词： nanocomposite materials Surface modification Photocatalysis Adsorption ability Optical properties

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Effects of Rare Earth Elements on Preparation of TiO_2-Pillared Bentonite

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Journal of Rare Earths 2005年第S1期23卷 324-327页

作者：于俊梅梁金生欧秀芹丁燕 Institute of Power Source & Ecomaterials Science Hebei University of Technology Tianjin 300130 China

Layered nanocomposite materials containing rare earth elements, titanium dioxide and bentonite (RE/TiO_2/Bent) were prepared by ion exchange technique with titanium tetrachloride and cerium nitrate as main precursors, and ethanol absolute as solvent. Their preparation, technical parameters, and mechanism of rare earth elements were studied. The results show that the interplanar distance d_ 100 of bentonite increases from 0.96781 nm of original bentonite to 1.88655 nm when ethanol absolute acts as solvent. The interaction between rare earth ions and titanium ions has an effect on titanium ions exchange. When Ce/Ti (in molar ratio)=0.1, rare earth elements are advantageous to the transfer of titanium ions to the interlayers of bentonite; when Ce/Ti=0.2, the action of rare earth elements is not evident; when Ce/Ti=0.4, the rare earth elements are disadvantageous to the preparation of nanocomposite materials.

关键词： titanium dioxide bentonite nanocomposite materials preparation rare earths

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Performance of rolling piston type rotary compressor using fullerenes(C70)and NiFe204 nanocomposites as lubricants additives

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Frontiers in Energy 2020年第3期14卷 644-648页

作者： Ruixiang WANG Yihao ZHANG Yi LIAO Beijing Engineering Research Centre of Sustainable Energy and Buildings Beijing University of Civil Engineering and ArchitectureBeijing 100044China Beijing Institute of Architectural Design Beijing 100045China Zhuhai Lingda Compressor Co. Ltd.Zhuhai 519100China

A novel way for a compressor to improve its coefficient of performance was proposed in this ***(C70)and NiFe2O4 nanocomposites were modified by span 80 and dispersed in refrigeration oil by solid grinding(SG).Besides,the tribological properties of the nanocomposites were investigated using a four ball friction *** results show that when the mass concentration of fullerenes nanocomposite is higher than 60 ppm and the concentration of nano-oil is 2 g/L,the friction coefficient decreases from 0.13 to 0.06 which means the wear is *** coefficient of performance of the compressor under the air conditioning test condition can be raised by 1.23%.

关键词： rotary compressor friction coefficient nanocomposite materials coefficient of performance fullerenes(C70)

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Influences of poly (vinyl alcohol) molecular weight and carbon nanotubes on radiation crosslinking shape memory polymers

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Progress in Natural Science:materials International 2017年第3期27卷 316-325页

作者： Aamer A.M.Alfayyadh S.Lotfy A.A.Basfar Mutasim I.Khalil Radiation Technology Center Nuclear Science Research InstituteKing Abdulaziz City for Science and Technology(KACST) Polymer Chemistry Department National Center for Radiation Research and TechnologyAtomic Energy Authority Department of Chemistry Faculty of ScienceKing Saud University

Polyvinyl alcohol（PVA） of two molecular weights was used to prepare shape memory polymers based on chemical-crosslinking by *** chemical-crosslinking was done in the presence of 2-carboxyethvl acrylate oligomers（CEA） and nano-filler[multi-wall carbon nanotubes（MWCNT） and functionalized carbon nanotubes（MWCNT-NH;）]followed by radiation-induced *** analysis of the material revealed an increase in the gel fraction and a significant reduction in swelling of the nanocomposite material that was crosslinked with both glutaraldehyde and ionizing *** radiation crosslinked nanocomposites demonstrated approximately a 90%gelation over a range of 50-300 kGy irradiation *** scanning electron microscopy（SEM） analysis showed a homogeneous distribution of nanocomposites in the composite *** thermal properties of radiation crosslinked（PVA/CEA） and（PVA-CEA）-nano-fillers were investigated by a thermogravimetric analysis（TGA）.The mechanical properties were examined via dynamic mechanical analysis（DMA） which showed significant variation because of the addition of *** radiation crosslinked materials show good shape memory behavior that may be useful in many applications based on the range of temperatures at which Tan 8 appears.

关键词： Shape memory polymers Radiation Poly(vinyl alcohol) nanocomposite materials

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Enhancement in ballistic performance of composite hard armor through carbon nanotubes

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International Journal of Smart and Nano materials 2013年第4期4卷 212-228页

作者： Jason Gibson James McKee Gregory Freihofer Seetha Raghavan Jihua Gou Department of Mechanical and Aerospace Engineering University of Central FloridaOrlando 32816FLUSA

The use of carbon nanotubes in composite hard armor is discussed in this *** processing techniques to make various armor composite panels consisting of Kevlar■29 woven fabric in an epoxy matrix and the subsequent V50 test results for both 44 caliber soft-point rounds and 30 caliber FSP(fragment simulated projectile)threats are presented.A 6.5%improvement in the V50 test results was found for a combination of 1.65 wt%loading of carbon nanotubes and 1.65 wt%loading of milled *** failure mechanism of carbon nanotubes during the ballistic event is discussed through scanning electron microscope images of the panels after the *** Spectroscopy was also utilized to evaluate the residual strain in the Kevlar■29 fibers post *** Raman Spectroscopy shows a Raman shift of 25 cm^(−1) for the Kevlar■29 fiber utilized in the composite panel that had an enhancement in the V50 performance by using milled fiber and multi-walled carbon *** both scenarios where an improvement was made and other panels without any improvement allows for understanding of how loading levels and synergistic effects between carbon nanotubes and milled fibers can further enhance ballistic performance.

关键词： carbon nanotubes ballistic composites composite armor nanocomposite materials

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Polymer/Transitonal Metal Oxides nanocomposites as Cathode materials for Rechargeable Lithium/Lithium lon Batteries

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材料科学与工程学报 2000年第Z2期20卷 572-576页

作者： Hui Kang Wu Ultralife Batteries Inc.2000 Technology Parkway Newark NY USA 14513

The synthesis and properties of polymer/transition metal oxides nanocomposite material were *** new nanocomposite material(PPY)0.5/MoO3 prepared by a new method is *** application of the nanocomposite materials as cat... 详细信息

关键词： nanocomposite materials cathode material new method

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Synthesis, Structural Characterization of TTM-TTF Intercalated with Lamellar MnPS3

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有机化学 2003年第Z1期23卷 260-260页

作者： ZHANG Xuan CHEN Xing-Guo FU Yang SU Xu QIN Jin-Gui Department of Chemistry Wuhan University Wuhan 430072 Department of Chemistry Wuhan University Wuhan 430072 Department of Chemistry Wuhan University Wuhan 430072 Department of Chemistry Wuhan University Wuhan 430072 Department of Chemistry Wuhan University Wuhan 430072

　　Intercalation of organic species into layer inorganic solids provides a useful approach to creating ordered organ ic-inorganic nanocomposite materials with novel properties compared with the parent compounds, and hence has attracted much attention in recent years. [1] Clement and co-workers had reported that an organic electron donor TTF monocation intercalated into the MPS3 (M = Mn, Fe), and the intercalates exhibited much higher conductivity than the corresponding pure host compounds. Our group also synthesized the intercalation compound of BEDT-TTF into MnPS3, which exhibits the room temperature conductivity of 8.5 × 10-5 S/cm, 1O5 times higher than that of the pristine MnPS3 ( ＜ 10- 10 S/cm). [2]……

关键词： nanocomposite materials intercalation compound room temperature electron donor

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