查看更多>>摘要：The Voronoi-tessellation method is a promising technique for porous implant design as it mimics the irregular structure of bone trabeculae very well.However,the optimal pore size distribution of Voronoi-based trabecular-like scaffolds(VBTSs)remains unknown.In this study,three VBTSs with different pore size distributions were fabricated by Electron-beam melting(EBM),with a regular cubic scaffold as a con-trol.Compression experiments showed that the elastic modulus of all the fabricated scaffolds was within the range of human bone.The biocompatibility of the porous scaffolds was evaluated by Cell Counting Kit-8,live/dead staining,phalloidin staining,and scanning electron microscope.The effects of scaffolds on osteogenic differentiation were evaluated by alkaline phosphatase(ALP)assay,Alizarin Red S(ARS)assay,and Real-time quantitative polymerase chain reaction(RT-qPCR).In vivo experiments were performed to evaluate the performance of bone regeneration in the scaffolds.The results showed that all scaffolds were nontoxic with good biosafety,and VBTSs were more conducive to promoting cell proliferation,osteogenic differentiation,and bone regeneration within the scaffolds.Among the 596-1044 μm range,the VBTS with an average pore size of 596 µm performed best.This study showed that bone regeneration could be regulated by controlling the porous structure and provided a reference for applying VBTSs in bone implants.
查看更多>>摘要：In the field of photocatalytic hydrogen production,metal sulfides are frequently utilized,particularly Cd sulfides,which have the benefits of a narrow band gap and a sufficient band gap.Other photocatalysts are required to enhance the situation because it still has a high photogenic carrier recombination rate and has flaws like photocorrosion that need to be fixed.The best morphology combination must be chosen since,as we are all aware,the morphology of the catalyst can significantly alter its activity.To choose the best morphology,we chose maple leaf CdS and WO3 with various morphologies to construct the S-Scheme heterojunctions,and WO3 was then applied to other metal sulfides.It is concluded that granular WO3-0D and CdS-F have the highest hydrogen evolution activity,which may indicate that 0D has the highest loading capacity and may play a certain supporting role for the catalyst that is easy to agglomerate,exposing more hydrogen evolution active sites to enhance hydrogen production.At the same time,the main hydrogen evolution active crystal face of the metal sulfide in the paper is(1 0 0)crystal face.When the crystal face is exposed,the metal sulfide in the paper has good hydrogen evolution activity,and the hydrogen evolution activity will be greatly reduced after the crystal face is covered.The established spatial angle between the(1 0 0)crystal face exposed by CdS-F and the(1 1 1)crystal face exposed by WO3-0D is large,so the highly active crystal face and active site are preserved as much as possible.On the other hand,WO3 decreases the recombination rate of electron-hole pairs in metal sulfide,resulting in a greater contribution of photogenerated electrons to the hydrogen evolution reaction.The Tafel clearly demonstrates the variation of hydrogen production rate control steps.This offers some suggestions for choosing the photocatalyst's morphological configuration.
查看更多>>摘要：Photogenerated charge separation is a challenging step in semiconductor-based photosynthesis.Though numerous efforts have been devoted to developing multi-component photocatalyst heterostructures for improving charge separation efficiency,the short distance between electrons and holes-aggregated re-gions still leads to undesirable charge recombination.Herein,a facile and commercial in-situ synthesis method was designed to directly prepare a three-component Au-carbon-TiO2 photocatalyst from Ti3C2 MXene,air,CO2,and HAuCl4,in which the carbon layer bridged Au and TiO2 nanoparticles for stable and efficient photocatalytic hydrogen production.Kelvin probe measurements and density functional theory(DFT)calculations demonstrated that a multi-interfacial charge transmission network was successfully constructed to achieve a directional and long-distance spatial charge separation/transfer channel between TiO2 and Au through carbon layer,desirably inhibiting the recombination of photogenerated charge car-riers.The hydrogen production rate of the formed three-component Au/C-TiO2(CTA)photocatalyst was demonstrated to be 27 times higher than that of Au-TiO2,which also surpassed many reported Ti3C2 MXene-derived carbon-TiO2 photocatalysts.This work sheds light on the ingenious use of 2D MXene to form a well-behaved TiO2-based photocatalytic system and helps to propose future design principles in accelerating charge transfer.
查看更多>>摘要：An ideal strategy for integrated melanoma treatment involves the pursuit of multifunctional biomaterials that possess adjuvant therapy functions,enabling full-scale postoperative relapse prevention,wound heal-ing,and real-time postoperative surveillance.The simulation of electronic skin(e-skin),which emulates the mechanical properties and functions of natural skin,holds significant potential for broad biomedi-cal applications.Herein,a novel multi-responsive controlled-release e-skin(PADM-MX-Ag-Si@Dox)was developed using natural porcine dermal matrix,MXene nanosheets,silver nanowires(AgNWs),and mesoporous hollow silica microspheres(TSOHSiO2@Dox)for drug-loading.The resulting e-skin exhibited temperature-,pH-,and electric-responsiveness due to the incorporation of TSOHSiO2@Dox microspheres,which allowed for on-demand controlled-release of Dox.The biomimetic structure of porcine acellular dermal matrix(PADM)can significantly accelerate the wound healing process under the synergistic effect of electrical stimulation(ES).PADM-MX-Ag-Si@Dox has demonstrated remarkable antimicrobial and elec-trophysiological activities,thereby establishing a robust basis for enhancing wound healing and facilitat-ing real-time postoperative tumor surveillance.Extensive in vitro and in vivo investigations have substan-tiated that the combined utilization of PADM-MX-Ag-Si@Dox and ES results in a proactive amalgamation of melanoma postoperative relapse prevention,wound healing,and real-time postoperative surveillance,thereby establishing a potent therapeutic approach for postoperative cancer adjuvant therapy and paving the way for novel precision medical care.
查看更多>>摘要：The effect of initial grain size on the recrystallization and recrystallization texture of a rolled Mg-3Gd(wt.％)alloy is studied in detail.The results show that the deformation microstructure of an initially coarse-grained(CG)sample has a larger twinned area and a higher density of twin boundaries than a fine-grained(FG)sample.After annealing,the CG sample recrystallizes preferentially in the twinned area,whereas the FG sample adopts the higher density grain boundaries as the nucleation sites.Fur-thermore,weak recrystallization texture components appear from the grain nucleation stage,regardless of the initial grain size,and are preserved after complete recrystallization due to uniform grain growth.The majority of recrystallization texture is deviated 20°-45° away from normal direction(ND),accounting for more than 50％.Especially,the recrystallization texture of the FG sample is a"Rare Earth texture",in contrast to the widely reported texture modification unrelated to grain boundary nucleation.Only a scattered basal texture is observed in the CG sample,which also differs from the reported"Rare Earth texture"originating from shear band nucleation in dilute Mg-Gd alloys.Finally,based on the Johnson-Mehl-Avrami-Kolmogorov(JMAK)model,the recrystallization kinetics are calculated,and it is found that the initial grain size mainly affects the nucleation rate,and has limited effect on the grain growth rate.
查看更多>>摘要：Aqueous zinc ion batteries(AZIBs)are now gaining widespread attention because of their cost-effectiveness,intrinsic safety,and high theoretical capacity.Nevertheless,it is still crucial to exploit high-performance electrode materials.Herein,the freestanding 1T MoS2@Mxene hybrid films(MMHF)were synthesized and directly served as the cathode of AZIBs.The freestanding MMHF exhibited the hierar-chical layer structure with excellent conductivity and strong interfacial interaction,which promoted the exposure of more active sites and the transfer of electrons/ions.Consequently,the MMHF displayed a high specific capacity of 270 mAh g-1(at 0.1 A g-1)and good rate performance.Impressively,even af-ter 2500 cycles under 10 A g-1,the freestanding MMHF cathode contributed a superior specific capacity of 108 mAh g-1 with an outstanding capacity retention rate of 94.7％.Meanwhile,the energy storage mechanism of the MMHF electrode was also elucidated through ex-situ characterizations.Furthermore,the density functional theory(DFT)computations revealed the strong interfacial interactions between 1T MoS2 and MXene,high conductivity,and low Zn2+diffusion barrier.This work provides a new viewpoint for designing freestanding transition metal disulfides(TMDs)-MXene hybrid film electrodes for AZIBs.
查看更多>>摘要：FeSiB metallic glass using pulsed laser processing is proved to show excellent catalytic performance in wastewater treatment for the first time by decolorizing and mineralizing reactive red 195.Pulsed laser can effectively improve the thermodynamic properties,surface photothermal conversion and hydrophilic-ity of catalyst.Compared with homogeneous FeSiB catalyst,heterogeneity a-Fe/FeSiB exhibits a high k value,strong TOC removal rate and low activation energy.Theoretical calculations indicate that the ex-cellent catalytic performance of heterogeneity catalyst is attributed to its unique nanoscale biphasic dis-order structure,resulting the energy barrier of the rate-determining-steps of the conversion of S2O82-to SO4-·is reduced from 2.20 to 1.52 eV.The reusability test of heterogeneity catalyst also shows that the abnormal recovery phenomenon of decolorization efficiency at the 19th cycle owing to its unique self-renewing.This study reveals that a nanoscale biphasic disorder structure is a new strategy for obtaining high catalytic rate and durability.
查看更多>>摘要：Understanding and clarifying the evolution of microstructure and performance of Al-Zr-Sc alloy wires during processing paths is a crucial issue in developing heat-resistant conductors with high strength and high electrical conductivity(EC).In this study,the microstructure evolution and corresponding perfor-mance changes of Al-0.2Zr-0.06Sc alloy wires produced by three processing paths are investigated.Re-sults indicate that ageing treatment+hot extrusion+cold drawing processing path can produce the highest strength Al-Zr-Sc wires attributed to favorable interactions among precipitation strengthening of Al3(Zr,Sc)phases,grain boundary strengthening and dislocation strengthening.High EC is attained by the hot extrusion+ageing treatment+cold drawing processing path,which reveals the importance of dy-namic precipitation of Al3Sc phases during hot extrusion and further precipitation of solute atoms during ageing treatment for improving the EC.The processing path using hot extrusion+cold drawing+ageing treatment achieves the highest EC of the Al-Zr-Sc wire,but the strength decreases significantly due to the loss of dislocation strengthening.Additionally,the pinning effect of Al3Sc and Al3(Zr,Sc)ensures good heat resistance of Al-Zr-Sc wires.These results provide guidance for the process design of Al-Zr-Sc wires with variable combinations of strength and EC.
查看更多>>摘要：Breathable and stretchable conductive materials are ideal for healthcare wearable electronic devices.However,the tradeoff between the sensitivity and detection range of electronic sensors and the chal-lenge posed by simple-functional electronics limits their development.Here,inspired by the bionic-leaf vein conductive path,silver nanowires(AgNWs)-Ti3C2Tx(MXene)hybrid structure assembled on the non-woven fabrics(NWF)is well sandwiched between porous polyborosiloxane elastomer(PBSE)to construct the multifunctional breathable wearable electronics with both high anti-impact performance and good sensing behavior.Benefiting from the high conductive AgNWs-MXene hybrid structure,the NWF/AgNWs-MXene/PBSE nanocomposite exhibits high sensitivity(GF=1158.1),wide monitoring range(57％),con-trollable thermal management properties,and excellent electromagnetic interference shielding effect(SET=41.46 dB).Moreover,owing to the wonderful shear stiffening effect of PBSE,the NWF/AgNWs-MXene/PBSE possesses a high energy absorption performance.Combining with deep learning,this breath-able electronic device can be further applied to wireless sensing gloves and multifunctional medical belts,which will drive the development of electronic skin,human-machine interaction,and personalized healthcare monitoring applications.
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