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Quantitative contributions of solution atoms, precipitates and deformation to microstructures and properties of Al-Sc-Zr alloys 认领 引用 被引量：11
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作者 Ren-guo GUAN Hong-mei JIN +5 位作者 Wensen JIANG Xiang WANG Yu-xiang WANG Zheng LI Jian ZHANG Huinan LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第5期907-918,共12页
In order to investigate the effects of solid solution atoms, precipitated particles and cold deformation on the microstructures and properties of Al-Sc-Zr alloys, the Al-Sc-Zr alloys prepared by continuous rheo-extrus... In order to investigate the effects of solid solution atoms, precipitated particles and cold deformation on the microstructures and properties of Al-Sc-Zr alloys, the Al-Sc-Zr alloys prepared by continuous rheo-extrusion were treated by thermomechanical treatment, analyzed for conductivity and mechanical properties by tensile and microhardness testing, and characterized using optical microscope, TEM and STEM. A mathematical model was established to quantitatively characterize the contribution of solid solution atoms, precipitates and cold deformation to the conductivity of the alloy. The results show that the strength of Al alloy can be significantly improved by solid solution, aging and cold deformation, and the quantitative impacts of solution atoms, precipitates and cold deformation on the conductivity of Al alloy are 10.5%(IACS), 2.3%(IACS) and 0.5%(IACS), respectively. Aging and cold deformation treatments are the keys to obtain high-strength and high-conductivity aluminum alloy wires. 展开更多
关键词 Al.Sc.Zr alloy thermal treatment cold deformation mechanical properties conductivity
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Effects of pre-precipitation of Cr_2N on microstructures and properties of high nitrogen stainless steel 认领 引用 被引量：6
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作者 李静媛 刘慧男 黄佩武 《Journal of Central South University》 SCIE EI CAS 2012年第5期1189-1195,共7页
Aging precipitation and solid solution heat treatment were carried out on three steels which have chromium content of 18%, manganese content of 12%, 15%, 18%, and nitrogen content of 0.43%, 0.53%, 0.67%, respectively.... Aging precipitation and solid solution heat treatment were carried out on three steels which have chromium content of 18%, manganese content of 12%, 15%, 18%, and nitrogen content of 0.43%, 0.53%, 0.67%, respectively. The mechanisms of precipitation and solid solution of high nitrogen anstenitic stainless steel were studied using the scanning electron microscopy, transmission electron microscopy, electron probe micro analysis and mechanical testing. The results show that, Cr2N is the primary precipitate in the tested stainless steels instead of Cr23C6. Cr2N nucleates at austenitic grain boundaries and grows towards inner grains with a lameUar morphology. By means of pre-precipitation of Cr2N at 800 ~C, the microstructure of the steels at solid solution state can be refined, thus improving the strength and plasticity. After the proposed treatment, the tensile strength, the proof strength and the elongation of the tested steel reach 881 MPa, 542 MPa and 54%, respectively. 展开更多
关键词 Cr2N precipitation refinement high nitrogen stainless steel （HNSS）
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In vitro evaluation of degradation,cytocompatibility and antibacterial property of polycaprolactone/hydroxyapatite composite coating on bioresorbable magnesium alloy 认领 引用 被引量：1
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作者 Zhang Chunyan Cheng Lan +3 位作者 Lin Jiajia Sun Dongwei Zhang Jun Liu Huinan 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第8期2252-2265,共14页
Polycaprolactone/hydroxyapatite(PCL/HA)composite coating was fabricated by a combination of hydrothermal and dipping methods to delay the degradation of Mg alloy AZ31 as bioresorbable materials.The PCL/HA coating was ... Polycaprolactone/hydroxyapatite(PCL/HA)composite coating was fabricated by a combination of hydrothermal and dipping methods to delay the degradation of Mg alloy AZ31 as bioresorbable materials.The PCL/HA coating was composed of nano rod-shape HA crystals and PCL filled in the space of HA crystals.Compared with the single HA coating,the binding strength between the PCL/HA composite coating and Mg alloy was obviously improved and the PCL/HA coating still adhered to the surface of AZ31 substrate even after 38 days of immersion.The electrochemical corrosion rate of HA coated sample was reduced by ten times after being filled by PCL.The electrochemical impedance spectroscopy(EIS)and immersion test results showed that the PCL/HA composite coating could provide a more effective barrier for Mg substrate than the HA coating alone.The cytocompatibility and the antibacterial property of HA coating and PCL/HA coating were evaluated by culturing with bone marrow-derived mesenchymal stem cells(BMSCs)and methicillin-resistant staphylococcus aureus(MRSA)for 24 h under direct culture conditions,respectively.The PCL/HA composite coating showed better BMSC cell compatibility,more suitable for BMSC adhesion than HA coating alone and showed a potential application prospect as a biological materials.However,from the perspective of clinical applications,the antibacterial property of PCL/HA composite coating needs to be further improved. 展开更多
关键词 Mg alloy PCL/HA coating Corrosion resistance Cytocompatibility Antibacterial property
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Facile, Green Synthesis of Large Single Crystal Copper Micro and Nanoparticles with Ascorbic Acid and Gum Arabic 认领 引用 被引量：1
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作者 Preston B. Landon Alexander H. Mo +2 位作者 Carlos T. Ramos Jose J. Gutierrez Ratnesh Lal 《Open Journal of Applied Sciences》 2013年第5期332-336,共5页
Large single crystal colloidal copper particles with diameters between 0.5 - 2 μm were created using a green synthesis process. The process used ascorbic acid to reduce Schweizer’s reagent created in situ using copp... Large single crystal colloidal copper particles with diameters between 0.5 - 2 μm were created using a green synthesis process. The process used ascorbic acid to reduce Schweizer’s reagent created in situ using copper salts in the presence of various concentrations of gum arabic. The Schweizer’s reagents were created by varying the concentrations of ammonium hydroxide and copper nitrate solutions, copper hydroxide, or copper sulfate. The pH of the solution was controlled by the addition of ascorbic acid. Particle formation was favored at high temperature using copper sulfate at pH values ranging from 7.5 to 9, while the optimal formation occurred at a pH value of 8.5. At high concentrations, copper particle formation was found to occur from the aggregation of smaller particles which continued to nucleate once aggregated, and this resulted in the creation of globular particles and large aggregates of micron-sized particles. The addition of gum arabic resulted in the creation of large single crystal particles that did not aggregate. SEM was used to observe the effect of increasing gum arabic concentrations and EDX was used to confirm the elemental purity of the particles. 展开更多
关键词 Copper Green Synthesis Microparticles Nanoparticles Gum Arabic Ascorbic Acid
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A facile method for fabrication of nano-structured Ni-Al_2O_3 graded coatings: Structural characterization 认领 引用 被引量：1
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作者 Arash YAZDANI Taghi ISFAHANI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第1期77-87,共11页
Powder charges of micron-size Ni and Al2O3were utilized to deposit nano-structured Ni-Al2O3composite coatings on analuminum plate fixed at the top end of a milling vial using a planetary ball mill.Composite coatings w... Powder charges of micron-size Ni and Al2O3were utilized to deposit nano-structured Ni-Al2O3composite coatings on analuminum plate fixed at the top end of a milling vial using a planetary ball mill.Composite coatings were fabricated using powdermixtures with a wide range of Ni/Al2O3mass ratio varying from1:1to plain Ni.XRD,SEM and TEM techniques were employed tostudy the structural characteristics of the coatings.It was found that the composition of the starting mixture strongly affects the Al2O3content and the microstructure of the final coating.Mixtures containing higher contents of Al2O3yield higher volume fractions of theAl2O3particles in the coating.Though Ni-Al2O3composite coatings with about50%of Al2O3particles were successfully deposited,well-compacted and free of cracks and/or voids coatings included less than20%(volume fraction)of Al2O3particles which weredeposited from powder mixtures with Ni/Al2O3mass ratios of4:1or higher.Moreover,mechanical and metallurgical bondings arethe main mechanisms of the adhesion of the coating to the Al substrate.Finally,functionally graded composite coatings withnoticeable compaction and integrity were produced by deposition of two separate layers under identical coating conditions. 展开更多
关键词 metal matrix composite Ni-Al2O3 graded coating structural characterization
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Superhydrophobic fluoride conversion coating on bioresorbable magnesium alloy——fabrication,characterization,degradation and cytocompatibility with BMSCs 认领 引用 被引量：7
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作者 Chunyan Zhanga Shiyu Zhang +3 位作者 Dongwei Sun Jiajia Lin Fancheng Meng Huinan Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第4期1252-1266,共15页
A micro-nano structure CaF2chemical conversion layer was prepared on fluoride-treated AZ31 alloy,then the composite fluoride conversion film(CaF2/MgF2)was modified by stearic acid(SA)and fabricated a superhyd... A micro-nano structure CaF2chemical conversion layer was prepared on fluoride-treated AZ31 alloy,then the composite fluoride conversion film(CaF2/MgF2)was modified by stearic acid(SA)and fabricated a superhydrophobic surface.The fluoride-treated magnesium,fluoride conversion film and superhydrophobic coating were characterized by SEM,EDS,XRD and FTIR.The properties of coatings1 adhesion and corrosion resistance were evaluated via tape test and electrochemical measurement.The cytocompatibility of the MgF2,CaF2and superhydrophobic CaF2/SA surface was investigated with bone marrow-derived mesenchymal stem cells(BMSCs)by direct culture for 24 h.The results showed that the superhydrophobic fluoride conversion coating composed of inner MgF2layer and the outer CaF2/SA composite layer had an average water contact angle of 152°.SA infiltrated into the micro-nano structure CaF2layer and formed a strong adhesion with CaF2layer.Furthermore,the super-hydrophobic coating showed higher barrier properties and corrosion resistance compared with the fluoride conversion film and fluoride-treated AZ31 alloy.The BMSC adhesion test results demonstrated MgF2CaF2and CaF2/SA coatings were all nontoxic to BMSC.At the condition of in direct contact with cells,MgF2showed higher cell density and enhanced the BMSCs proliferation,while CaF2and CaF2/SA coating showed no statistically difference in cell density compared with glass reference but the CaF2and CaF2/SA coating were not conducive to BMSCs adhesion. 展开更多
关键词 Biodegradable Magnesium alloy Superhydrophobic Fluoride conversion film Cytocompatibility
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Robust training of machine learning interatomic potentials with dimensionality reduction and stratified sampling 认领 引用 被引量：16
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作者 Ji Qi Tsz Wai Ko +2 位作者 Brandon C.Wood Tuan Anh Pham Shyue Ping Ong 《npj Computational Materials》 SCIE EI CSCD 2024年第1期2796-2806,共11页
Machine learning interatomic potentials(MLIPs)enable accurate simulations of materials at scales beyond that accessible by ab initio methods and play an increasingly important role in the study and design of materials... Machine learning interatomic potentials(MLIPs)enable accurate simulations of materials at scales beyond that accessible by ab initio methods and play an increasingly important role in the study and design of materials.However,MLIPs are only as accurate and robust as the data on which they are trained.Here,we present DImensionality-Reduced Encoded Clusters with sTratified(DIRECT)sampling as an approach to select a robust training set of structures from a large and complex configuration space.By applying DIRECT sampling on the Materials Project relaxation trajectories dataset with over one million structures and 89 elements,we develop an improved materials 3-body graph network(M3GNet)universal potential that extrapolates more reliably to unseen structures.We further show that molecular dynamics(MD)simulations with the M3GNet universal potential can be used instead of expensive ab initioMDto rapidly create a large configuration space for target systems.We combined this scheme with DIRECT sampling to develop a reliable moment tensor potential for titanium hydrides without the need for iterative augmentation of training structures.This work paves the way for robust high-throughput development of MLIPs across any compositional complexity. 展开更多
关键词 stratified potential titanium
Mass transport in a highly immiscible alloy on extended shear deformation 认领 引用
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作者 Miao Song Jia Liu +9 位作者 Xiaolong Ma Qin Pang Matthew J.Olszta Joshua Silverstein Madhusudhan R.Pallaka Peter V.Sushko Suveen N.Mathaudhu Cynthia Powell Arun Devaraj Bharat Gwalani 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第3期197-208,共12页
Forced mixing to a single-phase or supersaturated solid solution(SSS)and its prerequisite microstructure evolution in immiscible systems has been a focus of research for fundamental science and practical applications.... Forced mixing to a single-phase or supersaturated solid solution(SSS)and its prerequisite microstructure evolution in immiscible systems has been a focus of research for fundamental science and practical applications.Controlling the formation of SSS by shear deformation could enable a material design beyond conventional equilibrium microstructure in immiscible systems.Here,a highly immiscible Cu-50 at.%Cr binary alloy(mixing enthalpy of∼20 kJ mol−1)was employed to investigate the microstructure evolution and localized tendencies of SSS during severe shear deformation.Our results demonstrate the dislocation mediated microstructural refinement process in each phase of the binary alloy and the mechanisms associated with localized solute supersaturation as a function of shear strain.Pronounced grain refinement in the softer Cu phase occurs owing to the strain localization driving the preferential dynamic recrystallization.The grain refinement of the Cr phase,however,is enabled by the progressive evolution of grain lamination,splitting,and fragmentation as a function of shear strain.The solute supersaturation is found to be strongly dependent on the local environments that affect the dislocation activity,including the level of microstructure refinement,the interfacial orientation relationship,the mechanical incompatibility,and the localized preferential phase oxidation.Ab initio simulations confirm that it is more favorable to oxidize Cr than Cu at incoherent Cu/Cr interfaces,limiting the mass transport on an incoherent boundary.Our results unveil the mechanism underpinning the non-equilibrium mass transport in immiscible systems upon severe deformation that can be applied to produce immiscible alloys with superior mechanical properties. 展开更多
关键词 Tribology Immiscible alloys Nanostructures Shear deformation Forced mixing Atom probe
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Mechanism of Cationic Peptide-Induced Assembly of Gold Nanoparticles:Modulation of Electrostatic Repulsion 认领 引用
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作者 Benjamin Lam Robert Ramji +3 位作者 Margaret Mullooly Kristina D.Closser Tod A.Pascal Jesse V.Jokerst 《Aggregate》 EI CAS CSCD 2025年第6期109-124,共16页
The aggregation of plasmonic nanoparticles can lead to new and controllable properties useful for numerous applications.We recently showed the reversible aggregation of gold nanoparticles(AuNPs)via a small,cationic di... The aggregation of plasmonic nanoparticles can lead to new and controllable properties useful for numerous applications.We recently showed the reversible aggregation of gold nanoparticles(AuNPs)via a small,cationic di-arginine peptide;however,the mechanism underlying this aggregation is not yet comprehensively understood.Here,we seek insights into the intermolecular interactions of cationic peptide-induced assembly of citrate-capped AuNPs by empirically measuring how peptide identity impacts AuNP aggregation.We examined the nanoscale interactions between the peptides and the AuNPs via UV-vis spectroscopy to determine the structure-function relationship of peptide length and charge on AuNP aggregation.Careful tuning of the sequence of the di-arginine peptide demonstrated that the mechanism of assembly is driven by a reduction in electrostatic repulsion.We show that acetylated N-terminals and carboxylic acid C-terminals decrease the effectiveness of the peptide in inducing AuNP aggregation.The increase in peptide size through the addition of glycine or proline units hinders aggregation and leads to less redshift.Arginine-based peptides were also found to be more effective in assembling the AuNPs than cysteine-based peptides of equivalent length.We also illustrate that aggregation is independent of peptide stereochemistry.Finally,we demonstrate the modulation of peptide-AuNP behavior through changes to the pH,salt concentration,and temperature.Notably,histidine-based and tyrosine-based peptides could reversibly aggregate the AuNPs in response to the pH. 展开更多
关键词 DLVO theory gold nanoparticles intermolecular interactions peptides reversible aggregation
Predicting aqueous stability of solid with computed Pourbaix diagram using SCAN functional 认领 引用 被引量：7
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作者 Zhenbin Wang Xingyu Guo +1 位作者 Joseph Montoya Jens K.Nørskov 《npj Computational Materials》 SCIE EI CSCD 2020年第1期343-349,共7页
In this work,using the SCAN functional,we develop a simple method on top of the Materials Project(MP)Pourbaix diagram framework to accurately predict the aqueous stability of solids.We extensively evaluate the SCAN fu... In this work,using the SCAN functional,we develop a simple method on top of the Materials Project(MP)Pourbaix diagram framework to accurately predict the aqueous stability of solids.We extensively evaluate the SCAN functional’s performance in computed formation enthalpies for a broad range of oxides and develop Hubbard U corrections for transition-metal oxides where the standard SCAN functional exhibits large deviations.The performance of the calculated Pourbaix diagram using the SCAN functional is validated with comparison to the experimental and the MP PBE Pourbaix diagrams for representative examples.Benchmarks indicate the SCAN Pourbaix diagram systematically outperforms the MP PBE in aqueous stability prediction.We further show applications of this method in accurately predicting the dissolution potentials of the state-of-the-art catalysts for oxygen evolution reaction in acidic media. 展开更多
关键词 diagram stability functional
Development of flexible Li-ion batteries for flexible electronics 认领 引用 被引量：27
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作者 Yifan Zhao Juchen Guo 《InfoMat》 SCIE 2020年第5期866-878,共13页
We provide a critical review on the recent development of flexible lithium-ion batteries(FLIBs)for flexible electronic devices.The innovative designs of cell configuration for bendable and stretchable FLIBs,selection ... We provide a critical review on the recent development of flexible lithium-ion batteries(FLIBs)for flexible electronic devices.The innovative designs of cell configuration for bendable and stretchable FLIBs,selection of active materials,and evaluation methods for FLIBs are discussed.The grand challenges for FLIBs are energy density and scale-up fabrication as demonstrated in the review.Furthermore,the lack of quantitative evaluation methods for FLIBs'performance and nondestructive tools to probe the mechanical degradation may significantly hinder the development of FLIB technologies.Perspectives for future research directions,based on the current state of progress,are discussed. 展开更多
关键词 flexible electronic devices flexible Li-ion batteries nondestructive probe
Anisotropically Shaped Magnetic/Plasmonic Nanocomposites for Information Encryption and Magnetic-Field-Direction Sensing 认领 引用 被引量：4
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作者 Xiaojing Wang Ji Feng +4 位作者 Huakang Yu Yue Jin Andrew Davidson Zhiyuan Li Yadong Yin 《Research》 EI 2018年第1期11-23,共13页
Instantaneous control over the orientation of anisotropically shaped plasmonic nanostructures allows for selective excitation of plasmon modes and enables dynamic tuning of the plasmonic properties.Herein we report th... Instantaneous control over the orientation of anisotropically shaped plasmonic nanostructures allows for selective excitation of plasmon modes and enables dynamic tuning of the plasmonic properties.Herein we report the synthesis of rod-shaped magnetic/plasmonic core-shell nanocomposite particles and demonstrate the active tuning of their optical property by manipulating their orientation using an external magnetic feld.We further design and construct an IR-photoelectric coupling system,which generates an output voltage depending on the extinction property of the measured nanocomposite sample.We employ the device to demonstrate that the nanocomposite particles can serve as units for information encryption when immobilized in a polymer flm and additionally when dispersed in solution can be employed as a new type of magnetic-feld-direction sensor. 展开更多
关键词 composites property shaped
Cation reduction and comproportionation as novel strategies to produce high voltage,halide free,carborane based electrolytes for rechargeable Mg batteries 认领 引用 被引量：4
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作者 Scott.G.McArthur Linxiao Geng +1 位作者 Juchen Guo Vincent Lavallo 《Inorganic Chemistry Frontiers》 SCIE EI 2015年第12期1101-1104,共4页
Here we describe the cation reduction and comproportionation as novel routes to synthesize electrolytes for rechargeable Mg-ion batteries.Reduction of the ammonium cation in[HNMe31+][HCB11H111-]with met... Here we describe the cation reduction and comproportionation as novel routes to synthesize electrolytes for rechargeable Mg-ion batteries.Reduction of the ammonium cation in[HNMe31+][HCB11H111-]with metallic Mg affords the halide free carborane salt[Mg2+][HCB11H111-]2.Comproportionation of[Mg2+][HCB11H111-]2 with MgPh2 affords the novel monocationic electrolyte[MgPh1+][HCB11H111-],which reversibly deposits/strips Mg with a remarkable oxidative stability of 4.6 V vs.Mg0/+2. 展开更多
关键词 halide free cation reduction rechargeable Mg batteries halide free carborane salt mg hcb h comproportionation monocationic electrolyte mgph hcb h which ammonium cation carborane based electrolytes comproportionation
Complex RNA-DNA hybrid nanoshapes from iterative mix-andmatch screening 认领 引用 被引量：1
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作者 Shi Chen Zhiyuan Zhang +1 位作者 Eugene Alforque Thomas Hermann 《Nano Research》 SCIE EI CSCD 2021年第1期46-51,共6页
Hybrid nucleic acid nanostructures partition architectural and functional roles between ribonucleic acid(RNA)joints and deoxyribonucleic acid(DNA)connectors.Nanoshapes self-assemble from nucleic acid modules through s... Hybrid nucleic acid nanostructures partition architectural and functional roles between ribonucleic acid(RNA)joints and deoxyribonucleic acid(DNA)connectors.Nanoshapes self-assemble from nucleic acid modules through synergistic stabilization of marginally stable base pairing interactions within circularly closed polygons.Herein,we report the development of hybrid nanoshapes that include multiple different RNA modules such as internal loop and three-way junction(3WJ)motifs.An iterative mix-and-match screening approach was used to identify suitable DNA connectors that furnished stable nanoshapes for combinations of different RNA modules.The resulting complex multicomponent RNA-DNA hybrid nanoshapes were characterized by atomic force microscopy(AFM)imaging.Our research provides proof of concept for modular design,assembly and screening of RNA-DNA hybrid nanoshapes as building blocks for complex extended nucleic acid materials with features at the sub-10 nm scale. 展开更多
关键词 nucleic acid nanotechnology nanoshapes ribonucleic acid(RNA)three-way junction(3WJ) RNA deoxyribonucleic acid(DNA) sub-10 nm features
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Multi-carbonyl naphthalene diimide polymer as a highperformance cathode for stable lithium-ion storage 认领 引用 被引量：2
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作者 Hewei Luo Feigen Xiong +10 位作者 Haonan Bai Chen Wang Yang Wang Kang Zhao Ji Yan Yong Zhang Junwei Ding Shiwen Wang Linsen Zhang Juchen Guo Zitong Liu 《Nano Research Energy》 EI CSCD 2025年第2期1-8,共8页
Organic materials are emerging candidates for lithium-ion batteries.Unfortunately,limited electrical conductivity and high solubility in organic electrolytes usually cause low capacity and short cycle life,which hinde... Organic materials are emerging candidates for lithium-ion batteries.Unfortunately,limited electrical conductivity and high solubility in organic electrolytes usually cause low capacity and short cycle life,which hinder the utilization of organic materials.Herein,a novel multi-carbonyl naphthalene diimide non-conjugated polymer(NDI-BU)has been readily synthesized through one-step reaction.The designed polymer structure of NDI-BU shows a long and flat discharge platform.The abundant carbonyls provide multiple reaction sites for lithium ions,and resulting in a high specific capacity of 308 mAh·g-1 at 0.2C.An incredibly long cycle life of 20,000 cycles at 5C with 82%capacity retention is achieved.This work may inspire the effective design strategy for high energy density organic cathode materials. 展开更多
关键词 lithium-ion battery multi-carbonyl naphthalene diimide organic electrode polymer
Tip-enhanced nanocavities amplify the sum frequency generation 认领 引用
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作者 Chun-Chieh Yu Yuancheng Jing Wei Xiong 《Light: Science & Applications》 SCIE EI CAS CSCD 2025年第9期2373-2375,共3页
Tip-enhanced vibrational sum frequency generation(VSFG)spectroscopy is proposed and demonstrated.Incorporation with the plasmon cavities leads to significant signal amplification-up to 14 orders of magnitude.
关键词 tip enhanced nanocavities sum frequency generation vibrational sum frequency generation spectroscopy plasmon cavities
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Fabric-substrated capacitive biopotential sensors enhanced by dielectric nanoparticles 认领 引用 被引量：5
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作者 Xiangjun Chen Xiaoxiang Gao +12 位作者 Akihiro Nomoto Keren Shi Muyang Lin Hongjie Hu Yue Gu Yangzhi Zhu Zhuohong Wu Xue Chen Xinyu Wang Baiyan Qi Sai Zhou Hong Ding Sheng Xu 《Nano Research》 SCIE EI CSCD 2021年第9期3248-3252,共5页
Wearable biopotential sensing devices are essential to long-term and real-time monitoring of human health.Non-contact,capacitive sensing electrodes prevent potential skin iritations,and are thus beneficial for long-te... Wearable biopotential sensing devices are essential to long-term and real-time monitoring of human health.Non-contact,capacitive sensing electrodes prevent potential skin iritations,and are thus beneficial for long-term monitoring.Existing capacitive electrodes are either connected to a separate control circuit via external wires or have limited sensing capacitances,which leads to low signal qualities.This study demonstrates a stretchable capacitive sensing device with integrated electrodes and control electronics,with enhanced signal qualities.The electrodes and the control electronics are fabricated on a common fabric substrate for breathability and strain-limiting protection.The stretchable electrodes are based on an island-bridge design with a stretchability as high as-100%,and an area ratio as high as-80%.By using a dielectric calcium copper titanate(CCTO)composite as the adhesive layer,the electrode capacitance can be increased,yielding an enhanced signal-to-noise ratio(SNR)in the acquired biopotentials.This device offers a convenient and comfortable approach for long-term non-contact monitoring of biopotential signals. 展开更多
关键词 capacitive sensing biopotential stretchable calcium copper titanate(CCTO) signal-to-noise ratio(SNR)
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Rechargeable Multivalent-Ion Batteries 认领 引用 被引量：2
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作者 Juchen Guo Jennifer LSchaefer Yuyan Shao 《Energy Material Advances》 EI CAS CSCD 2024年第1期283-284,共2页
Rechargeable batteries based on multivalent metal anodes including earth-abundant magnesium(Mg),calcium(Ca),zinc(Zn),and aluminum(Al)are potential new“beyond lithium(Li)”electrochemical energy storage technologies f... Rechargeable batteries based on multivalent metal anodes including earth-abundant magnesium(Mg),calcium(Ca),zinc(Zn),and aluminum(Al)are potential new“beyond lithium(Li)”electrochemical energy storage technologies for large-scale energy storage applications.These multivalent elements are more earth abundant,and therefore promising candidates for reducing global dependence on Li for our growing energy storage needs.Since the seminal work by Aurbach and coworkers[1]demonstrating the first prototype rechargeable Mg batteries,tremendous efforts have been made to the research and development of rechargeable multivalent-ion batteries. 展开更多
关键词 energy storage calcium batteries rechargeable batteries multivalent elements multivalent metal anodes energy storage technologies magnesium batteries
力致发光驱动的咬合控制人机交互界面 认领 引用 被引量：2
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作者 王春枫 胡鸿杰 +1 位作者 朱德亮 潘曹峰 《Science Bulletin》 SCIE EI CAS CSCD 2023年第6期559-561,M0003,共3页
Human–machine interfaces (HMIs) enable the intuitive cognition and interaction between users and devices [1–3]. The conventional HMIs such as mouse, keyboard and touchscreen have significantly simplified the manipul... Human–machine interfaces (HMIs) enable the intuitive cognition and interaction between users and devices [1–3]. The conventional HMIs such as mouse, keyboard and touchscreen have significantly simplified the manipulations of computers and associated devices, while they suffer from bulk, big footprint and mechanical noncompliance for applications in virtual/augmented reality and Internet of Things, and more importantly, difficulties in operation for people with disabilities such as dexterity impairments or neurological conditions [4,5]. 展开更多
关键词 人机交互界面 力致发光 enable
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Peroxidase-Like Reactivity at Iron-Chelation Sites in a Mesoporous Synthetic Melanin 认领 引用 被引量：1
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作者 Yijun Xie Kelsey A.Krug +7 位作者 Kristine S.Cay Mark Kalaj Naneki C.McCallum Zofia E.Siwicka Zhao Wang Nathan C.Gianneschi Michael D.Burkart Jeffrey D.Rinehart 《CCS Chemistry》 CSCD 2021年第3期1483-1490,共8页
High catalytic activity and substrate specificity make enzymes a rich source of inspiration for catalyst development.Co-opting the advantages of natural materials while tuning them to a modified form and purpose,howev... High catalytic activity and substrate specificity make enzymes a rich source of inspiration for catalyst development.Co-opting the advantages of natural materials while tuning them to a modified form and purpose,however,is not a straightforward synthetic task.Polymerization of L-3,4-dihydroxyphenylalanine(L-DOPA)results in amorphous polymer nanoparticles that are similar in many ways to natural eumelanin.Herein,the authors introduce mesoporosity and iron ion chelation to synthesize a variant of the L-DOPA polymer with high peroxidase-like activity.Our results indicate catalytic reaction with peroxide under mildly acidic conditions(pH 5.4 and 6)with a greater maximum reaction velocity(Vmax)than horseradish peroxidase(HRP)at optimal pH 3.5–4.5.Comparison between Fe(Ⅲ)and Fe(Ⅱ)loading indicates that either can be used as a starting point to trigger reactivity,though Fe(Ⅱ)loading leads to materials with twice the Vmax of the Fe(Ⅲ)-loaded sample.The lack of catalyst degradation despite the redox changes and presence of radical species is consistent with the robust nature and redox versatility of polydopamine-based materials and demonstrates strong potential as a versatile redox-catalysis platform. 展开更多
关键词 L-DOPA mesoporosity peroxidase-like reactivity iron ion chelation catalysis
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