High-entropy alloys(HEA)represent a novel material class,with significant potential for research on performance and preparation in additive manufacturing(AM).Currently,FCC HEA dominates the research on AM-fabricated H...High-entropy alloys(HEA)represent a novel material class,with significant potential for research on performance and preparation in additive manufacturing(AM).Currently,FCC HEA dominates the research on AM-fabricated HEA,with a shift in focus from preparation to microstructure design and mechanical properties enhancement.Research on BCC HEA is currently primarily focused on preparation and process optimization.However,it is important to note that the biomedical potential of AM-fabricated BCC HEA should not be overlooked.This review provides a concise summary of the properties and preparation techniques of exceptional HEAs in recent years.It specifically emphasizes the novel microstructure achieved through AM techniques,which significantly enhance the mechanical properties of HEAs.Additionally,the review outlines the various preparation methods employed to mitigate defect introduction during AM processes.Finally,it offers insights into the future research directions and potential applications of additively manufactured HEA.展开更多
At the present stage, The imported grape wine in China have hot market, imports increased year by year, high gross mar-gins, many brands, uneven quality, low market confidence, the price value of large deviations, imp...At the present stage, The imported grape wine in China have hot market, imports increased year by year, high gross mar-gins, many brands, uneven quality, low market confidence, the price value of large deviations, imperfect legislation, regulatory confusion and so on characters. The relevant departments and units should actively take a number of measures to improve the market of imported grape wine stably and healthy development. Believe in the future, its imports would continue to grow, the gross profit margin gradually would return to rational, the cost-effective products would be prevailing, the sales channels would be diversification, the enterprises in-volved would increase, and the industry competition would become increasingly fierce.展开更多
ZnO nanomaterials have become appealing for next-generation micro/nanodevices owing to their remarkable functionality and outstanding performance.However,in-situ,one-step,patterned synthesis of ZnO nanomaterials with ...ZnO nanomaterials have become appealing for next-generation micro/nanodevices owing to their remarkable functionality and outstanding performance.However,in-situ,one-step,patterned synthesis of ZnO nanomaterials with small grain sizes and high specific surface areas remains challenging.While breakthroughs in laser-based synthesis techniques have enabled simultaneous growth and patterning of these materials,device integration restrictions owing to pre-prepared laser-absorbing layers remain a severe issue.Herein,we report a single-step femtosecond laser direct writing(FsLDW)method for fabricating ZnO nanomaterial micropatterns with a minimum linewidth of less than 1μm without requiring laser-absorbing layers.Furthermore,utilizing the grain-size modulation effect of glycerol,we successfully reduced the grain size and addressed the challenges of discontinuity and non-uniform product formation during FsLDW.Using this technique,we successfully fabricated a series of 2 micro-photodetectors with exceptional performance,a switching ratio of 105,and a responsivity of 10 A/W.Notably,the devices exhibited an ultralow dark current of less than 10 pA,more than one order of magnitude lower than the dark current of ZnO photodetectors under the same bias voltage—crucial for enhancing the signal-to-noise ratio and reducing the power consumption of photodetectors.The proposed method could be extended to preparing other metal-oxide nanomaterials and devices,thus providing new opportunities for developing customized,miniaturized,and integrated functional devices.展开更多
The tilted implant with immediate function is increasingly used in clinical dental therapy for edentulous and partially edentulous patients with excessive bone resorption and the anatomic limitations in the alveolar r...The tilted implant with immediate function is increasingly used in clinical dental therapy for edentulous and partially edentulous patients with excessive bone resorption and the anatomic limitations in the alveolar ridge.However,peri-implant cervical bone loss can be caused by the stress shielding effect.Herein,inspired by the concept of“materiobiology”,the mechanical characteristics of materials were considered along with bone biology for tilted implant design.In this study,a novel Ti-35Nb-2Ta-3Zr alloy(TNTZ)implant with low elastic modulus,high strength and favorable biocompatibility was developed.Then the human alveolar bone environment was mimicked in goat and finite element(FE)models to investigate the mechanical property and the related peri-implant bone remodeling of TNTZ compared to commonly used Ti-6Al-4V(TC4)in tilted implantation under loading condition.Next,a layer-by-layer quantitative correlation of the FE and X-ray Microscopy(XRM)analysis suggested that the TNTZ implant present better mechanobiological characteristics including improved load transduction and increased bone area in the tilted implantation model compared to TC4 implant,especially in the upper 1/3 region of peri-implant bone that is“lower stress”.Finally,combining the static and dynamic parameters of bone,it was further verified that TNTZ enhanced bone remodeling in“lower stress”upper 1/3 region.This study demonstrates that TNTZ is a mechanobiological optimized tilted implant material that enhances load transduction and bone remodeling.展开更多
基金The authors acknowledge the financial supports from National Natural Science Foundation of China(Grant Nos.51831011,52011530181)the Shanghai Science and Technology Commission(Grant No.20S31900100).
文摘High-entropy alloys(HEA)represent a novel material class,with significant potential for research on performance and preparation in additive manufacturing(AM).Currently,FCC HEA dominates the research on AM-fabricated HEA,with a shift in focus from preparation to microstructure design and mechanical properties enhancement.Research on BCC HEA is currently primarily focused on preparation and process optimization.However,it is important to note that the biomedical potential of AM-fabricated BCC HEA should not be overlooked.This review provides a concise summary of the properties and preparation techniques of exceptional HEAs in recent years.It specifically emphasizes the novel microstructure achieved through AM techniques,which significantly enhance the mechanical properties of HEAs.Additionally,the review outlines the various preparation methods employed to mitigate defect introduction during AM processes.Finally,it offers insights into the future research directions and potential applications of additively manufactured HEA.
文摘At the present stage, The imported grape wine in China have hot market, imports increased year by year, high gross mar-gins, many brands, uneven quality, low market confidence, the price value of large deviations, imperfect legislation, regulatory confusion and so on characters. The relevant departments and units should actively take a number of measures to improve the market of imported grape wine stably and healthy development. Believe in the future, its imports would continue to grow, the gross profit margin gradually would return to rational, the cost-effective products would be prevailing, the sales channels would be diversification, the enterprises in-volved would increase, and the industry competition would become increasingly fierce.
基金financially supported by the National Natural Science Foundation of China(Grant numbers 52275429 and 62205117)。
文摘ZnO nanomaterials have become appealing for next-generation micro/nanodevices owing to their remarkable functionality and outstanding performance.However,in-situ,one-step,patterned synthesis of ZnO nanomaterials with small grain sizes and high specific surface areas remains challenging.While breakthroughs in laser-based synthesis techniques have enabled simultaneous growth and patterning of these materials,device integration restrictions owing to pre-prepared laser-absorbing layers remain a severe issue.Herein,we report a single-step femtosecond laser direct writing(FsLDW)method for fabricating ZnO nanomaterial micropatterns with a minimum linewidth of less than 1μm without requiring laser-absorbing layers.Furthermore,utilizing the grain-size modulation effect of glycerol,we successfully reduced the grain size and addressed the challenges of discontinuity and non-uniform product formation during FsLDW.Using this technique,we successfully fabricated a series of 2 micro-photodetectors with exceptional performance,a switching ratio of 105,and a responsivity of 10 A/W.Notably,the devices exhibited an ultralow dark current of less than 10 pA,more than one order of magnitude lower than the dark current of ZnO photodetectors under the same bias voltage—crucial for enhancing the signal-to-noise ratio and reducing the power consumption of photodetectors.The proposed method could be extended to preparing other metal-oxide nanomaterials and devices,thus providing new opportunities for developing customized,miniaturized,and integrated functional devices.
基金supported by the National Natural Science Foundation of China[grant number 52171075,51831011,U2032124]the Medical Engineering Cross Key Research Foundation of the Shanghai Jiao Tong University[grant number YG2017ZD06]+1 种基金the Science and Technology Commission of Shanghai Municipality[grant number 201409006300]the Opening Project of Shanghai Key Laboratory of Orthopaedic Implant[grant number KFKT2021001].
文摘The tilted implant with immediate function is increasingly used in clinical dental therapy for edentulous and partially edentulous patients with excessive bone resorption and the anatomic limitations in the alveolar ridge.However,peri-implant cervical bone loss can be caused by the stress shielding effect.Herein,inspired by the concept of“materiobiology”,the mechanical characteristics of materials were considered along with bone biology for tilted implant design.In this study,a novel Ti-35Nb-2Ta-3Zr alloy(TNTZ)implant with low elastic modulus,high strength and favorable biocompatibility was developed.Then the human alveolar bone environment was mimicked in goat and finite element(FE)models to investigate the mechanical property and the related peri-implant bone remodeling of TNTZ compared to commonly used Ti-6Al-4V(TC4)in tilted implantation under loading condition.Next,a layer-by-layer quantitative correlation of the FE and X-ray Microscopy(XRM)analysis suggested that the TNTZ implant present better mechanobiological characteristics including improved load transduction and increased bone area in the tilted implantation model compared to TC4 implant,especially in the upper 1/3 region of peri-implant bone that is“lower stress”.Finally,combining the static and dynamic parameters of bone,it was further verified that TNTZ enhanced bone remodeling in“lower stress”upper 1/3 region.This study demonstrates that TNTZ is a mechanobiological optimized tilted implant material that enhances load transduction and bone remodeling.
