查看更多>>摘要：The two-way shape memory effect in a Ti-18.5Zr-10Nb-3.5Ta high-temperature shape memory alloy was investigated.X-ray diffraction measurement shows that the alloy is composed of orthorhombic α"-martensite.ω phase is not found in Ti-18.5Zr-10Nb-3.5Ta alloy due to the suppressing effect of Ta element.The α"-martensite laths are found in the transmission electron microscope observation;after the bending deformation,there appear a lot of dislocations.The alloy exhibits a shape memory strain of 3.8％and a high reverse martensite transformation start temperature of 464 K.The maximum two-way shape memory strain of 1.2％is obtained in the alloy with the pre-bending training strain of 10％.The mechanism can be ascribed to the effect of internal stress field caused by dislocations.
查看更多>>摘要：Optical temperature sensing based on the fluo-rescence intensity ratio(FIR)of red emission for lan-thanide ions holds significant relevance in non-contact temperature measurement for biological application.In this study,the perovskite-structured KZnF3 is utilized as a host material for Er3+to achieve a high-purity upconversion(UC)red emission.The observed Stark splitting of the red emission peak provides evidence of the energy level splitting of Er3+.Group theory is employed to decompose the spectral branching of Er3+ under the point group symmetry of KZnF3,allowing for the derivation of Stark splitting energy levels induced by the crystal field effect.The optical temperature-sensing behavior of the red UC luminescence was investigated,specifically examining the FIR of the splitting sub-peaks,which exhibited an expo-nential relationship with temperature.The KZnF3∶Yb3+,Er3+demonstrated a relative sensitivity(Sr)of 0.00182％·K-1 at 298 K,highlighting its excellent response to temperature.Ex vivo bio-thermometry exper-iments conducted on chicken breast validated the mate-rial's ability to penetrate biological tissues and showed its significant sensitivity of the FIR to temperature.These results establish KZnF3:Yb3+,Er3+as a promising material for optical thermometry in various biological applications.
查看更多>>摘要：The recycling of cathode materials from spent lithium-ion battery has attracted extensive attention,but few research have focused on spent blended cathode materials.In reality,the blended materials of lithium iron phosphate and ternary are widely used in electric vehicles,so it is critical to design an effective recycling technique.In this study,an efficient method for recovering Li and Fe from the blended cathode materials of spent LiFePO4 and LiNixCoyMn1-x-yO2 batteries is proposed.First,87％Al was removed by alkali leaching.Then,91.65％Li,72.08％Ni,64.6％Co and 71.66％Mn were further separated by selective leaching with H2SO4 and H2O2.Li,Ni,Co and Mn in solution were recovered in the form of Li2CO3 and hydroxide respectively.Subsequently,98.38％Fe was leached from the residue by two stage process,and it is recovered as FePO4·2H2O with a purity of 99.5％by pre-cipitation.Fe and P were present in FePO4·2H2O in amounts of 28.34％and 15.98％,respectively.Addition-ally,the drift and control of various components were discussed,and cost-benefit analysis was used to assess the feasibility of potential application.
查看更多>>摘要：The physical and chemical properties of feldspar and quartz are highly similar,thus they cannot be easily sep-arated effectively.In this work,the flotation separation of feldspar from quartz using sodium fluosilicate(Na2SiF6;SF)as a selective depressant was investigated.Moreover,the influ-ence mechanism of SF on the selective flotation separation of feldspar and quartz was investigated via flotation tests,chem-ical analysis of flotation solution,Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and contact angle analysis.The results of the flotation tests show that feldspar and quartz without SF treatment have good floatability.After SF treatment,feldspar still has good floata-bility,whereas quartz has significantly reduced floatability.Flotation solution chemical analysis shows that the functional group plays an important role in depressing the quartz is[SiF6]2-.FTIR,XPS and contact angle analysis results show that[SiF6]2-is adsorbed only on the surface of quartz.Thus,a thin hydrophilic SiOF layer is generated on the surface,which interferes with the adsorption of the collector on the surface of the quartz.This phenomenon leads to a significant reduction in quartz's floatability.Therefore,SF has a good ability to sepa-rate feldspar from quartz by flotation.
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