Mesocrystalline TiO<Subscript>2</Subscript>/sepiolite composites for the effective degradation of methyl orange and methylene blue

Mesocrystalline TiO₂/sepiolite (TiS) composites with the function of adsorption and degradation of liquid organic pollutants were successfully fabricated via a facile and low-cost solvothermal reaction. The prepared TiS composites were characterized by FESEM, HRTEM, XRD, XPS, N₂ adsorption-desorption, UV–vis DRS, and EPR. Results revealed the homogeneous dispersion of highly reactive TiO₂ mesocrystals on the sepiolite nanofibers. Thereinto each single–crystal–like TiO₂ mesocrystal comprised many [001]-oriented anatase nanoparticles about 10–20 nm in diameter. The photocatalytic activity was further evaluated by the degradation of anionic dye (methyl orange) and cationic dye (methylene blue) under the UV-vis light (350≤λ≤780 nm) irradiation. By selecting appropriate experimental conditions, we can easily manipulate the photocatalytic performance of TiS composites. The optimal TiS catalyst (the sepiolite content of 28.5 wt.%, and the reaction time of 24 h) could efficiently degrade methyl orange to 90.7% after 70 min, or methylene blue to 97.8% after 50 min, under UV-vis light irradiation. These results can be attributed to their synergistic effect of high crystallinity, large specific surface area, abundant hydroxyl radicals, and effective photogenerated charge separation.     

Role of zirconium in the phase formation at the interdendritic zone in nickel-based superalloys

A commercial Alloy 80A and a modified alloy with lower titanium and zirconium contents, e.g. 1.4% and <0.01%, respectively, were subjected to unidirectional solidification followed by a rapid quench in water to preserve the structure at elevated temperatures. The slow solidification results in a coarse dendritic structure with a high enrichment of sulphur (up to 2%), aluminium (up to 4%), titanium (up to 13%) and zirconium in the interdendritic zones. In the commercial Alloy 80A, the zirconium and sulphur present in the interdendritic zone result in a eutectic containing ZrS and NiCrTi-matrix. Excess zirconium forms an NiZr-intermetallic. No TiS is formed in this case. In the absence of zirconium, the titanium enriched in the interdendritic residual melt forms a eutectic of TiS. In both cases the effective solidus temperature corresponding to the composition of the residual melt is 1170°C, compared to 1330 °C, which is the solidus temperature of the bulk material.     

09CuPTiRE钢板中析出物的透射电镜研究

利用透射电镜，对09CuPTiRE钢板中析出物进行了研究。结果表明，在热轧过程中TiN和TiS先后析出；稀土元素的加入在一定程度上改善了钢材的横向冲击韧性。     

Ti6Al4V合金激光原位合成自润滑复合涂层高温摩擦学性能

为提高Ti6Al4V合金的高温摩擦学性能,采用激光熔覆技术在其表面原位合成多相混杂金属基高温自润滑耐磨复合涂层,熔覆粉末的成分为Ni60-16.8%TiC-23.2%WS_2(质量分数,下同),系统地研究复合涂层的显微组织、物相结构及其在20,300,600,800℃下的摩擦学性能和相关磨损机理。结果表明:复合涂层的显微硬度(701.88HV_0.5)约为基体(350 HV_0.5)的2倍;由于原位合成固体润滑相(Ti_2SC/TiS/NiS/TiO/TiO_2/NiCr_2O_4/Cr_2O_3)和硬质相(W,Ti)C_1-x/TiC/Cr_7C_3的协同作用,复合涂层的耐磨减摩性能明显优于基体。随着温度升高,涂层和基体的摩擦因数和磨损率均呈下降趋势,在800℃时复合涂层和基体的摩擦因数分别为0.32和0.43,磨损率分别为1.80×10^-4,2.92×10^-5mm/Nm。在800℃下塑性变形、分层和氧化磨损为基体主要磨损机理,复合涂层以氧化磨损和轻微的黏着磨损为主。     

热处理对激光熔覆钛基复合涂层组织和微动磨损性能的影响

为研究不同温度热处理对激光熔覆钛基复合涂层组织和微动磨损性能的影响,采用激光熔覆技术在TA2钛合金表面制备40%Ti-25.2%TiC-34.8%WS_2(质量分数)复合涂层,将涂层分别置于300,500℃和700℃真空中保温1h,分析热处理前后涂层的显微组织和微动磨损耐磨性能。结果表明:未经过热处理涂层及经过不同温度热处理涂层的主要物相均为α-Ti,(Ti,W)C_(1-x),TiC,Ti_2SC和TiS。未热处理及经过300,500℃和700℃热处理1h涂层的显微硬度分别为1049.8,980.7,1143.3HV_(0.5)和1190.7HV_(0.5)。经过700℃热处理1h涂层表现出优异的微动磨损性能,磨损机理为黏着磨损和磨粒磨损。     

Fabrication of nanocomposites of alginate/pectin crosslinked with Ca2+ and its applications for the reduction of Cr6+ to Cr3+and sensor activities

Journal of Materials Science: Materials in Electronics - Composite gels of Alginate/Pectin/Dextran (Alg/Pec/Dex/Ca2+) with and without Au, or TiO2, or SiO2 NPs and then crosslinked with Ca2+ were...     

Controlled loading of MnS2 on porous TiO2 nanosheets for enhanced photocatalytic hydrogen evolution

Journal of Materials Science: Materials in Electronics - In this report, spherical nanoparticles/2D nanosheets based MnS2/TiO2 nanocomposites were prepared in different weight compositions which...     

The novel behavior of real and imaginary part of impedance,modulus, and AC conductivity of Au/PPy–MWCNTs/TiO2/Al2O3/n-Si/Al

Journal of Materials Science: Materials in Electronics - This work presents a novel structure of Au/PPy-MWCNTs/TiO2/Al2O3/n-Si/Al which hasn't been explored before. This structure is applied in...     

Multifunctional WSe2/SnSe2/WSe2 van der Waals heterostructures

Journal of Materials Science: Materials in Electronics - In this study, we report the fabrication of WSe2/SnSe2/WSe2 van der Waals (vdW) heterostructures for potential applications as tunnel...     

Synthesis of Au/SnO2 composites and their sensing properties toward n-butanol

Journal of Materials Science: Materials in Electronics - A series of very small grain Au/SnO2 composites were synthesized by a facile hydrothermal method. The microstructure of the Au/SnO2...     

Dependence of β-Co(OH)2/ZnO heterostructural composite prepared by one-pot hydrothermal method on visible-light-driven photocatalytic degradation of organic dye

Journal of Materials Science: Materials in Electronics - A β-Co(OH)2/ZnO heterostructural composite was successfully prepared via a simple one-pot hydrothermal method. The β-Co(OH)2/ZnO...     

Improved microwave dielectric properties of wolframite MgZrNb2O8 ceramics by (Ti1/2W1/2)5+ ionic co-substitution

Journal of Materials Science: Materials in Electronics - In this study, (Ti1/2W1/2)5+ ionic co-substitution effects on the crystal structural evolution, microstructure, and microwave dielectric...     

CeO2-doped bismosiliconate-borotellurite glasses: linear/nonlinear optical properties as well as photon/neutron attenuation effectiveness

Journal of Materials Science: Materials in Electronics - Linear/nonlinear optical properties as well as photon and neutron attenuation/transmission properties of CeO2-doped...     

Lattice vibrational characteristics,crystal structure,and dielectric properties of single-phase Sr(Mg1/2Mo1/2)O3 microwave dielectric ceramic

Journal of Materials Science: Materials in Electronics - Sr(Mg1/2Mo1/2)O3 (SMM) microwave dielectric ceramic was prepared by a solid-state sintering method. X-ray diffraction shows that the sample...     

Enhancement in lithium storage performances of SiO2/graphene-based nanocomposites prepared by low cost and facile approach

Journal of Materials Science: Materials in Electronics - The new nanocomposites of silicon dioxide/reduced graphene oxide (SiO2/rGO) and silicon dioxide/nitrogen-doped reduced graphene oxide...     

Constructing BiOBr/g-C3N4/Bi2O2CO3 Z-scheme photocatalyst with enhanced photocatalytic activity

Journal of Materials Science: Materials in Electronics - In this work, the novel camellia-structured double Z-scheme BiOBr/g-C3N4/Bi2O2CO3 was simply prepared by a hydrothermal method. XRD, FTIR,...     

Complex (Mg1/3Ta2/3)4+ ionic substitution on the phase structure and microwave dielectric properties of wolframite MgZr1−x(Mg1/3Ta2/3)xNb2O8 (0 ≤ x ≤ 0.08) ceramics

Journal of Materials Science: Materials in Electronics - In this study, single-phase MgZr1?x(Mg1/3Ta2/3)xNb2O8 (0?≤?x?≤?0.08) ceramics with monoclinic...     

Improved electrochemical performance of silicon-carbon anodes by different conductive agents

Journal of Materials Science: Materials in Electronics - Silica/silicon/polyacrylonitrile (SiO2/Si/PAN) composites were prepared as active anode for lithium-ion batteries (LIBs) using a rational...     

Structural and electrochemical investigation of novel hybridized MnO2/V2O5 nanocomposites prepared by one-step microwave-assisted method for electrochemical supercapacitor application

Journal of Materials Science: Materials in Electronics - Pure V2O5 and MnO2/V2O5 hybrid nanocomposites were synthesized by microwave-assisted method for electrochemical supercapacitor application....     

Effect of oxygen on the dielectric and energy storage performances of lead-free Bi2Mg2/3Nb4/3O7 thin films prepared by magnetron sputtering

Journal of Materials Science: Materials in Electronics - Bi2Mg2/3Nb4/3O7 (BMN) thin films are prepared on Pt–Si substrates by magnetron sputtering, the influence of oxygen on dielectric and...