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Two-Electrode Screen-Printed pH Sensors for Monitoring Soil and Other Growing Media

IEEE Sensors Journal 2025年第11期25卷 18692-18701页

作者： Crichton, Catherine A. Lahann, Lucas Barba, Juan Pablo Cisneros Yuan, Titan Strand, Elliot J. Bruno, Nicholas Goodrich, Payton J. Baumbauer, Carol L. Atreya, Madhur Bihar, Eloise Silver, Whendee L. Pister, Kristofer Arias, Ana Claudia Whiting, Gregory L. University of California Berkeley Department of Electrical Engineering and Computer Science 253 Cory Hall BerkeleyCA94720 United States University of California Berkeley Department of Environmental Science Policy and Management 130 Mulford Hall BerkeleyCA94720 United States University of Colorado Boulder Paul M. Rady Department of Mechanical Engineering 1111 Engineering Drive BoulderCO80309 United States University of Colorado Boulder Materials Science and Engineering 4001 Discovery Drive BoulderCO80303 United States

Monitoring soil pH is important for optimizing plant biomass production, understanding nutrient cycling, predicting and mitigating greenhouse gas emissions, and improving soil health. Soil pH can vary significantly over time and space, and high spatiotemporal resolution data are needed to enable informed land management decisions. A potential method to address this need is to use large numbers of easily distributed pH sensor systems which can be placed at high density in soils. An approach for fabricating such sensors is described here using a voltammetric screen-printed pH sensor with a working electrode that incorporates Alizarin (a pH-sensitive dye) throughout its bulk. The use of a Nafion membrane on top of the working electrode and a salt membrane over the reference electrode provides near-Nernstian sensitivity and enhanced device stability in buffered media, soil, and hydroponic fluid. Critically, these devices can function effectively in a novel 2-electrode (working and reference) configuration with a sensitivity of 56.38 mV/pH and a resolution of 0.28 pH (n=3), enabling the use of simple, low-cost readout electronics for evaluating the sensor state. These results show that a printed pH sensor paired with affordable electronics can be used to monitor the pH of unbuffered media, providing a potential path to high-spatial density real-time measurement of pH in soils and hydroponics. © 2001-2012 IEEE.

关键词： Alizarin

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Cold sintering process:A green route to fabricate thermoelectrics

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Journal of Advanced Ceramics 2024年第11期13卷 1697-1712页

作者： Jinxue Ding Jing Guo Ruijuan Yan Wei Li Shuailing Ma Yanqin Fu Wenjie Xie Ralf Riedel Anke Weidenkaffa Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany State Key Laboratory for Mechanical Behavior of Materials&School of Materials Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Mechanical and Materials Engineering The University of Alabama at BirminghamBirmingham 35294USA Institute of High Pressure Physics School of Physical Scientific and TechnologyNingbo UniversityNingbo 315211China Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites Carbon Matrix Composites Research InstituteHenan Academy of SciencesZhengzhou 450046China Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS Alzenau 63755Germany

Cold sintering is a newly developed low-temperature sintering technique that has attracted extensive attention in the fabrication of functional materials and *** sintering temperatures allow for a substantial reduction in energy consumption,and simple experimental equipment offers the possibility of large-scale *** cold sintering process(CSP)has been demonstrated to be a green and cost-effective route to fabricate thermoelectric(TE)materials where significant grain growth,secondary phase formation,and element volatilization,which are prone to occur during high-temperature sintering,can be well *** this review,the historical development,understanding,and application of thermoelectric materials produced via cold sintering are *** latest attempts related to the cold sintering process for thermoelectric materials and devices are discussed and *** some current technical challenges,cold sintering provides a promising and sustainable route for the design of advanced high-performance thermoelectrics.

关键词： cold sintering process(CSP) thermoelectrics(TEs) low-temperature sintering transport properties transient liquidphase

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MXene:From synthesis to environment remediation

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Chinese Journal of Chemical engineering 2023年第9期61卷 260-280页

作者： Ali Nikkhah Hasan Nikkhah Hadis langari Alireza Nouri Abdul Wahab Mohammad Ang Wei Lun Ng law Yong Rosiah Rohani Ebrahim Mahmoudi Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Department of Mechanical and Aerospace Engineering University at BuffaloBuffaloUSA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsUSA Department of Chemistry and Medicinal Chemistry University at BuffaloBuffaloUSA Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul RahmanJalan Sungai LongBandar Sungai LongKajangSelangorMalaysia

A new burgeoning family of two-dimensional(2D)transition metal carbides/nitrides,better known as MXenes,have received extensive attention because of their distinct properties,such as metallic conductivity,good hydrophilicity,large surface area,good mechanical stability,and *** 40 different MXenes have been synthesized,and dozens more structures and properties have been theoretically ***,the recent progress in MXenes development is not well covered in chronological order based on different *** review article focuses on emerging synthesis methods,the properties of MXenes,and mainly the applications of MXenes and MXene-based material family in environmental remediation,a comprehensive review of gaseous and aqueous pollutants treatment.

关键词： MXene 2D materials Wastewater treatment CO_(2)capture Adsorption Photodegradation

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Controlled Formation of Honey Carbon Nanotube Thin Films by Tailoring the Ratio of Admixture Concentration and Annealing Time

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 146-147页

作者： Hood, Kaleb Tanim, Md Mehedi Hasan Templin, Zoe Dao, Annie Zhao, Feng Jiao, Jun Department of Mechanical & Materials Engineering Portland State University Portland OR USA Department of Engineering & Computer Science Washington State University Vancouver WA United States

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A soft magnetoelectric finger for robots’multidirectional tactile perception in non-visual recognition environments

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npj Flexible Electronics 2024年第1期8卷 938-948页

作者： Yizhuo Xu Shanfei Zhang Shuya Li Zhenhua Wu Yike Li Zhuofan Li Xiaojun Chen Congcan Shi Peng Chen Pengyu Zhang Michael D.Dickey Bin Su State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074 HubeiP.R.China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074 HubeiP.R.China Department of Chemical and Biomolecular Engineering North Carolina State UniversityRaleighNC 27695USA

Robotic fingers with multidirectional tactile perception are of great importance for the robotic exploration of complex unknown space,especially in environments in which visualization is not ***,most existing tactile sensors for robotic fingers cannot detect multidirectional forces,which greatly limits their potential for further development in navigating complex ***,we demonstrate a soft magnetoelectric finger(SMF)that can achieve self-generated-signal and multidirectional tactile *** SMF is composed of two parts:a‘finger’covered with a skin-like flexible sheath containing five liquid metal(LM)coils and a‘phalangeal bone’containing a *** to the changes in magnetic flux through the LM coils caused by external forces,diverse induced voltages are generated and collected in real-time,which can be explained by Maxwell’s numerical *** the analysis of the signals generated by the five LM coils,the SMF can detect forces in varied directions and distinguish 6 different common objects with varied Young’s moduli with an accuracy of 97.46%.These capabilities make the SMF suitable for complex unknown space exploration tasks,as proved by the black box *** SMF can enable the development of self-generated-signal and multidirectional tactile perception for future robots.

关键词： environments magneto perception

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Nitrogen-doping assisted local chemical heterogeneity and mechanical properties in CoCrMoW alloys manufactured via laser powder bed fusion

Advanced Powder Materials

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Advanced Powder materials 2024年第5期3卷 46-57页

作者： Wenting Jiang Ruidi Li Junyang He Song Ni Li Wang Zibin Chen Yi Huang Caiju Li Jianhong Yi Min Song State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Materials and Advanced Manufacturing Hunan University of TechnologyZhuzhou 412007China Research Institute for Advanced Manufacturing Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong KongChina Department of Design and Engineering Faculty of Science and TechnologyBournemouth UniversityPooleDorsetBH125BBUK Materials Research Group Department of Mechanical EngineeringUniversity of SouthamptonSouthamptonSO171BJUK Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

CoCrMoW alloys with different nitrogen(N)additions(0,0.05,0.1,and 0.2 wt%)were prepared via laser powder bed fusion(LPBF).The effects of N content on the microstructure and mechanical properties were *** results indicate that the LPBFed CoCrMoW alloy with 0.1 wt%N addition(0.1 N alloy)shows the best combination of mechanical properties with a yield strength of~983 MPa and an elongation of~19%.Both the LPBF process and the N addition impose great effects on suppressing theγtoεmartensitic transformation,resulting in a decrease in the width and amount ofεlaths/stacking ***,the N addition promotes the segregation of elements Mo,W,and Si along the cellular sub-grain boundaries(CBs),forming fine and discontinuous precipitates rich in Mo,W and Si along the CBs in the 0.1 N alloy,but dense and continuous(Mo,W)5Si_(3)precipitates along the CBs in the 0.2 N ***(Mo,W)5Si_(3)precipitates with a tetragonal structure were observed and characterized for the first time in the Co-Cr based *** negative mixing enthalpy between the non-metallic elements N,Si and the metallic elements Mo,W,Cr,and the rapid solidification induced segregation of high melting point elements such as Mo and W along CBs during LPBF process,synergistically contribute to the chemical heterogeneity in the *** pure FCC matrix,the slightly increased segregation of Mo,W,Si elements and fine precipitates along the CBs contribute to the good combination of strength and elongation of the 0.1 N ***,though pure FCC phase was present in the 0.2 N alloy,the dense and continuous(Mo,W)5Si_(3)precipitates along CBs acted as nucleation sites for cracks,deteriorating the elongation of the ***,it is possible to tune the mechanical properties of the LPBFed CoCrMoW alloy by adjusting the local chemical heterogeneity.

关键词： CoCrMoW alloy Laser powder bed fusion Nitrogen addition mechanical properties Precipitation behaviors

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mechanically durable,super-repellent 3D printed microcell/nanoparticle surfaces

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Nano Research 2022年第6期15卷 5678-5686页

作者： Sajad Haghanifar Anthony J Galante Mehdi Zarei Jun Chen Susheng Tan Paul W Leu Department of Industrial Engineering University of PittsburghPittsburghPA 15261USA Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA 15261USA Department of Electrical and Computer Engineering and Peterson Institute of NanoScience and Engineering University of PittsburghPittsburghPA 15261USA Department of Chemical Engineering University of PittsburghPittsburghPA 15261USA

Three-dimensional(3D)printed re-entrant micropillars have demonstrated high static contact angles for an unprecedented variety of liquids,but have yet to achieve this with low contact angle hysteresis and excellent abrasion *** report on the demonstration of 3D printed microcell/nanoparticle structures that exhibit high static contact angle,low contact angle hysteresis,and high mechanical *** and microcells both exhibit high static contact angles with water and ethylene glycol(EG),but suffer from high contact angle hysteresis,indicative of rose petal *** modeling results indicate that micropillars are able to achieve higher static contact angle and breakthrough pressure simultaneously compared with ***,simulations also indicate that micropillars have higher maximum equivalent stress at their bases,so that they are more prone to mechanical *** address contact angle hysteresis and mechanical durability issues by the creation of 3D printed microcell/nanoparticle arrays that demonstrate super-repellency and retain their super-repellency after 100 cycles of mechanical abrasion with a Scotch-Brite abrasive pad under a pressure of 1.2 *** use of interconnected microcell structures as opposed to micropillars addresses mechanical durability *** contact angle hysteresis is realized by coating 3D printed structures with low surface energy nanoparticles,which lowers the solid–liquid contact area *** results demonstrate new 3D printed structures with mechanical durability and super-repellency through the use of microcell structures integrated with fluorinated nanoparticles.

关键词： superomniphobicity three-dimensional(3D)printing surface evolver mechanical durability microcell re-entrant micropillar

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Additive manufacturing of porous magnesium alloys for biodegradable orthopedic implants:Process,design,and modification

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Journal of materials science & Technology 2024年第15期182卷 79-110页

作者： Bo Peng Haojing Xu Fei Song Peng Wen Yun Tian Yufeng Zheng State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Institute for Precision Medicine Tsinghua University Beijing Tsinghua Changgung HospitalBeijing 102218China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Department of Orthopedics Peking University Third HospitalBeijing 100191China Department of Materials Science and Engineering Peking UniversityBeijing 100871China

Biodegradable magnesium(Mg)alloys exhibit excellent biocompatibility,adequate mechanical properties,and osteogenic *** can contribute to complete recovery of damaged tissues without concerns about a second surgery and have achieved clinical applications in orthopedic and cardiovascular *** scaffolds can provide functions such as bone integration and adjustable mechanical properties,thus widely used for bone *** manufacturing(AM)offers the advantages of design freedom and high precision,enabling the reliable production of porous scaffolds with customized *** combination of biodegradable Mg alloys,porous scaffolds,and AM processes has created tremendous opportunities for the precision treatment of bone *** article reviews the current development in the additive manufacturing process and design of Mg alloy biodegradable orthopedic implants,fo-cusing on chemical compositions,structural design,surface treatment,and their effects on mechanical properties,degradation behavior,and ***,the future perspective of porous Mg alloy biodegradable orthopedic implants is proposed.

关键词： Biodegradable magnesium alloys Additive manufacturing Laser powder bed fusion Orthopedic implants Porous structure design Degradation behavior

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In vitro evaluation of degradation,cytocompatibility and antibacterial property of polycaprolactone/hydroxyapatite composite coating on bioresorbable magnesium alloy

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Journal of Magnesium and Alloys 2022年第8期10卷 2252-2265页

作者： Zhang Chunyan Cheng Lan Lin Jiajia Sun Dongwei Zhang Jun Liu Huinan School of Materials Science&Engineering Chongqing University of TechnologyNo.69 Hongguang AvenueChongqing 400054China Department of Bioengineering and the Materials Science and Engineering ProgramUniversity of CaliforniaRiverside900 University AvenueMSE 205RiversideCA 92521USA

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 *** PCL/HA coating was composed of nano rod-shape HA crystals and PCL filled in the space of HA *** 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 *** electrochemical corrosion rate of HA coated sample was reduced by ten times after being filled by *** 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 *** 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,*** 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 ***,from the perspective of clinical applications,the antibacterial property of PCL/HA composite coating needs to be further improved.

关键词： Mg alloy PCL/HA coating Corrosion resistance Cytocompatibility Antibacterial property

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Modeling the failure of silicon carbide under high strain-rate compression: A parametric study

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materials Today: Proceedings 2023年 87卷 134-139页

作者： Chandran L. Rapaka S.D. Eswara Prasad K. Annabattula R.K. Department of Metallurgy Engineering and Materials Science Indian Institute of Technology Indore Indore 453552 India Department of Mechanical Engineering Indian Institute of Technology Madras Chennai 600036 India

Split-Hopkinson Pressure Bar (SHPB) is the most widely used characterization technique to determine the strength and failure of armor ceramics under impact loading conditions. The modifications in SHPB test apparatus in order to test brittle and hard materials like ceramics, call for extensive trials to understand the perfect combination of parameters that will give reliable results. Conducting experiments over such a large combination of process parameters is an expensive affair and hence the process parameters are often optimized with the help of finite element simulations. In the current study, the high strain rate behavior (through modified-SHPB tests) of Silicon Carbide which is prevalent in armor applications is examined using finite element simulations in Abaqus/Explicit. A thorough investigation of the influence of experimental parameters on the generated stress waves and the material response was carried out. The constitutive behavior of SiC specimen is described using Johnson-Holmquist (JH-2) material model. The observed trends due to changes in parameters related to striker and pulse shaper dimensions are reported, which consequently may be used as a guideline for experimentations on other advanced ceramic materials as well. © 2023

关键词： High strain-rate deformation Pulse shaping Silicon carbide Split Hopkinson Pressure Bar (SHPB)

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