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Isolation and Characterization of Cellulose Nanofiber(CNF)from Kenaf(Hibiscus cannabinus)Bast through the Chemo-Mechanical Process
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作者 Rudi Dungani Mohammad Irfan Bakshi +4 位作者 Tsabita Zahra Hanifa Mustika Dewi Firda A.Syamani Melbi Mahardika Widya Fatriasari 《Journal of Renewable Materials》 EI CAS 2024年第6期1057-1069,共13页
The present work emphasizes the isolation of cellulose nanofiber(CNF)from the kenaf(Hibiscus cannabinus)bast through a chemo-mechanical process.In order to develop high CNF yield with superior properties of CNF for im... The present work emphasizes the isolation of cellulose nanofiber(CNF)from the kenaf(Hibiscus cannabinus)bast through a chemo-mechanical process.In order to develop high CNF yield with superior properties of CNF for improving compatibility in varied applications this method is proposed.The fiber purification involved pulping and bleaching treatments,whereas mechanical treatment was performed by grinding and high-pressure treatments.The kraft pulping as a delignification method followed by bleaching has successfully removed almost 99%lignin in the fiber with high pulp yield and delignification selectivity.The morphology of the fibers was characterized by scanning electron microscopy,which showed a smooth surface,fiber bundles,gel-shaped nanofiber,and an average size of 94.05 nm with 69%of CNF in 34–100 nm size.The chemo-mechanical process exhibited a more crystalline nature in CNF than pulp kenaf.The low zeta potential values exhibit the distribution of fibrils and colloidal suspension stability without any further agglomeration.A lower concentration of CNF is less stable exhibiting the product agglomeration.Therefore,the chemo-mechanical process for the isolation of CNF(Hibiscus cannabinus)from kenaf involves sustainable,low-cost,non-toxic,and cheap alternatives than other traditional methods. 展开更多
关键词 Kenaf bast fiber kraft delignification and bleaching ultrafine grinder chemo-mechanical properties CNF
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A general solution for one dimensional chemo-mechanical coupled hydrogel rod 被引量:4
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作者 Xing-Quan Wang Qing-Sheng Yang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2018年第2期392-399,共8页
Smart hydrogels are environmentally sensitive hydrogels, which can produce a sensitive response to external stimuli, and often exhibit the characteristics of multi filed coupling. In this paper, a hydrogel rod under c... Smart hydrogels are environmentally sensitive hydrogels, which can produce a sensitive response to external stimuli, and often exhibit the characteristics of multi filed coupling. In this paper, a hydrogel rod under chemomechanical coupling was analytically studied based on a poroelastical model. The already known constitutive and governing equations were simplified into the one dimensional case, then two different boundary conditions were considered. The expressions of concentration, displacement,chemical potential and stress related to time were obtained in a series form. Examples illustrate the interaction mechanism of chemical and mechanical effect. It was found that there was a balance state in the diffusion of concentration and the diffusion process could lead to the expansion or the stress change of the hydrogel rod. 展开更多
关键词 chemo-mechanical coupling Analytical solution One dimensional hydrogel rod
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A chemo-mechanical model coupled with thermal effect on the hollow core–shell electrodes in lithium-ion batteries 被引量:6
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作者 Bin Hu Zengsheng Ma +2 位作者 Weixin Lei Youlan Zou Chunsheng Lu 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2017年第4期199-206,共8页
Electrode is a key component to remain durability and safety of lithium-ion(Li-ion) batteries. Li-ion insertion/removal and thermal expansion mismatch may induce high stress in electrode during charging and discharg... Electrode is a key component to remain durability and safety of lithium-ion(Li-ion) batteries. Li-ion insertion/removal and thermal expansion mismatch may induce high stress in electrode during charging and discharging processes. In this paper, we present a continuum model based on COMSOL Multiphysics software, which involves thermal, chemical and mechanical behaviors of electrodes. The results show that,because of diffusion-induced stress and thermal mismatch, the electrode geometry plays an important role in diffusion kinetics of Li-ions. A higher local compressive stress results in a lower Li-ion concentration and thus a lower capacity when a particle is embedded another, which is in agreement with experimental observations. 展开更多
关键词 Lithium-ion battery Diffusion-induced stress COMSOL chemo-mechanical Electrode
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Circumventing chemo-mechanical failure of Sn foil battery anode by grain refinement and elaborate porosity design 被引量:1
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作者 Shuibin Tu Xin Ai +8 位作者 Xiancheng Wang Siwei Gui Zhao Cai Renming Zhan Yuchen Tan Weiwei Liu Hui Yang Chenhui Li Yongming Sun 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第11期477-484,I0010,共9页
Tin (Sn) metal foil is a promising anode for next-generation high-energy–density lithium-ion batteries (LIBs) due to its high capacity and easy processibility. However, the pristine Sn foil anode suffers nonuniform a... Tin (Sn) metal foil is a promising anode for next-generation high-energy–density lithium-ion batteries (LIBs) due to its high capacity and easy processibility. However, the pristine Sn foil anode suffers nonuniform alloying/dealloying reaction with lithium (Li) and huge volume variation, leading to electrode pulverization and inferior electrochemical performance. Herein, we proposed that reduced grain size and elaborate porosity design of Sn foil can circumvent the nonuniform alloy reaction and buffer the volume change during the lithiation/delithiation cycling. Experimentally, we designed a three-dimensional interconnected porous Sn (3DIP-Sn) foil by a facile chemical alloying/dealloying approach, which showed improved electrochemical performance. The enhanced structure stability of the as-fabricated 3DIP-Sn foil was verified by chemo-mechanical simulations and experimental investigation. As expected, the 3DIP-Sn foil anode revealed a long cycle lifespan of 4400 h at 0.5 mA cm^(−2) and 1 mAh cm^(−2) in Sn||Li half cells. A 3DIP-Sn||LiFePO_(4) full cell with LiFePO_(4) loading of 7.1 mg cm^(−2) exhibited stable cycling for 500 cycles with 80% capacity retention at 70 mA g^(−1). Pairing with high-loading commercial LiNi0.6Co0.2Mn0.2O_(2) (NCM622, 18.4 mg cm^(−2)) cathode, a 3DIP-Sn||NCM622 full cell delivered a high reversible capacity of 3.2 mAh cm^(−2). These results demonstrated the important role of regulating the uniform alloying/dealloying reaction and circumventing the localized strain/stress in improving the electrochemical performance of Sn foil anodes for advanced LIBs. 展开更多
关键词 Sn foil anode 3D interconnected porous structure Grain refinement Uniform alloying/dealloying reaction chemo-mechanical failure
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The Influence of Entanglements of Net Chains on Phase Transition Temperature of Sensitive Hydrogels in Chemo-Mechanical Coupled Fields 被引量:1
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作者 Tao Li Qingsheng Yang +1 位作者 Lianhua Ma Xiaojun Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第6期995-1014,共20页
Phase transition of hydrogel,which is polymerized by polymer network,can be regarded as the transition of polymer network stability.The stability of the polymer network might be changed when the external environment c... Phase transition of hydrogel,which is polymerized by polymer network,can be regarded as the transition of polymer network stability.The stability of the polymer network might be changed when the external environment changed.This change will lead to the transformation of sensitive hydrogels stability,thus phase transition of hydrogel take place.Here,we present a new free density energy function,which considers the non-gaussianity of the polymer network,chains entanglement and functionality of junctions through adding Gent hyplastic model and Edwards-Vilgis slip-link model to Flory-Huggins theory.A program to calculate the phase transition temperature was written based on new free energy function.Taking PNIPAM hydrogel as an example,the effects of network entanglement on the phase transition temperature of hydrogel were studied by analyzing the microstructure parameters of the hydrogel networks.Analytical results suggest a significant relationship between phase transition temperature and entanglement network. 展开更多
关键词 Sensitive hydrogel ENTANGLEMENTS phase transition chemo-mechanical coupling fields.
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Study of Chemical Etching and Chemo-Mechanical Polishing on CdZnTe Nuclear Detectors 被引量:1
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作者 Aaron L. Adams Stephen U. Egarievwe +4 位作者 Ezekiel O. Agbalagba Rubi Gul Anwar Hossain Utpal N. Roy Ralph B. James 《Journal of Materials Science and Chemical Engineering》 2019年第8期33-41,共9页
Cadmium zinc telluride (CdZnTe) semiconductor has applications in the detection of X-rays and gamma-rays at room temperature without having to use a cooling system. Chemical etching and chemo-mechanical polishing are ... Cadmium zinc telluride (CdZnTe) semiconductor has applications in the detection of X-rays and gamma-rays at room temperature without having to use a cooling system. Chemical etching and chemo-mechanical polishing are processes used to smoothen CdZnTe wafer during detector device fabrication. These processes reduce surface damages left after polishing the wafers. In this paper, we compare the effects of etching and chemo-mechanical polishing on CdZnTe nuclear detectors, using a solution of hydrogen bromide in hydrogen peroxide and ethylene glycol mixture. X-ray photoelectron spectroscopy (XPS) was used to monitor TeO2 on the wafer surfaces. Current-voltage and detector-response measurements were made to study the electrical properties and energy resolution. XPS results showed that the chemical etching process resulted in the formation of more TeO2 on the detector surfaces compared to chemo-mechanical polishing. The electrical resistivity of the detector is of the order of 1010 &#937;-cm. The chemo-mechanical polishing process increased the leakage current more that chemical etching. For freshly treated surfaces, the etching process is more detrimental to the energy resolution compared to chemo-mechanically polishing. 展开更多
关键词 CDZNTE CHEMICAL ETCHING chemo-mechanical POLISHING Gamma RAYS Nuclear Detectors X-Ray PHOTOELECTRON Spectroscopy
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Theory and Calculation of the J-Integral for Coupled Chemo-Mechanical Fracture Mechanics
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作者 Wei Wei Qingsheng Yang +2 位作者 Xia Liu Xiaoqiao He Kim-Meow Liew 《Computer Modeling in Engineering & Sciences》 SCIE EI 2018年第6期387-409,共23页
In this paper,by introducing a chemical field,the J-integral formulation is presented for the chemo-mechanical coupled medium based on the laws of thermodynamics.A finite element implementation of the J-integral was p... In this paper,by introducing a chemical field,the J-integral formulation is presented for the chemo-mechanical coupled medium based on the laws of thermodynamics.A finite element implementation of the J-integral was performed to study the mode I chemo-mechanical coupled fracture problem.For derivation of the coupled J-integral,the equivalent domain integral(EDI)method was applied to obtain the mode I J-integral,with expression of the area integrals based on constitutive relationships of a linear elastic small deformation for chemo-mechanical coupling,instead of the finite deformation problem.A finite element procedure is developed to compute the mode I J-integral,and numerical simulation of the y-direction stress field is studied by a subroutine UEL(User defined element)developed in ABAQUS software.Accuracy of the numerical results obtained using the mode I J-integral was verified by comparing them to a well-established model based on linear elastic fracture mechanics(LEFM).Furthermore,a numerical example was presented to illustrate path-independence of the formulated J-integral for a chemo-mechanical coupled specimen under different boundary conditions,showing a high accuracy and reliability of the present method.The variation laws of J-integral and the y-direction stress field with external chemical,mechanical loading and time are revealed.The J-integral value increases with larger external concentration loading in the same integral domain.The extent of diffusion is much greater with larger concentration,which leads to a stronger coupling effect due to the chemical field.This work provides new insights into the fracture mechanics for the chemo-mechanical coupled medium. 展开更多
关键词 chemo-mechanical coupling fracture J-INTEGRAL EQUIVALENT domain integral(EDI)method finite element METHOD
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A Finite Element Procedure for Analysis of Chemo-Mechanical Coupling Behavior of Hydrogels
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作者 Wei Wei Qingsheng Yang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2016年第7期33-58,共26页
Chemo-mechanical coupling behavior of materials is a transformation process between mechanical and chemical energy.In this paper,based on the coupled chemo-mechanical constitutive equations and governing equations dur... Chemo-mechanical coupling behavior of materials is a transformation process between mechanical and chemical energy.In this paper,based on the coupled chemo-mechanical constitutive equations and governing equations during isothermal process,the equivalent integral forms of chemo-mechanical coupling governing equations and corresponding finite element procedure are obtained by using Hamilton’s principle.An isoparametric plane element for chemo-mechanical coupling is associated into ABAQUS finite element package through user element subroutine UEL.The numerical examples exhibit that the ionic concentration variation can cause mechanical deformation and mechanical action can produce redistribution of ionic concentration for hydrogels.It is proved that the present developed chemo-mechanical coupling finite element procedure can be utilized to model the coupling behavior of hydrogels effectively. 展开更多
关键词 HYDROGEL chemo-mechanical coupling Hamilton’s PRINCIPLE Coupled FINITE element method
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Influence of Coupled Chemo-Mechanical Process on Corrosion Characteristics in Reinforcing Bars
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作者 徐亦冬 钱春香 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第3期538-543,共6页
We studied the corrosion characteristics of reinforcing bars in concrete under different corrosion conditions. The area-box (AB) value was used to classify the shape of pitting corrosion morphology in meso-scale, an... We studied the corrosion characteristics of reinforcing bars in concrete under different corrosion conditions. The area-box (AB) value was used to classify the shape of pitting corrosion morphology in meso-scale, and fractographs of reinforcing bars with different corrosion morphology were discussed in micro- and macro-scales. The results show that the existence of the tensile stress affects the corrosion characteristics of reinforcing bars. The pitting morphology and fractograph of reinforcing bars exhibit a statistical fractal feature. The linear regression model fits the relationship between fractal dimensions of corrosion morphology and fractal dimension of fractograph fairly well. Using fractal dimension as the characterization parameter can not only reflect the characteristics of pitting corrosion morphology in reinforcing bars, but also reveal the fracture feature of corroded reinforcing bars. 展开更多
关键词 reinforcing bar chemo-mechanical coupling pitting corrosion morphology FRACTOGRAPH FRACTAL
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Chemo-mechanical couplings in compacted argillite submitted to high-pH environment
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作者 O. Cuisinier F. Masrouri 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE 2010年第4期314-320,共7页
In the French concept of deep nuclear wastes repository, the galleries should be backfilled with excavated argillite after the site exploitation period. After several thousands of years, the degradation of the concret... In the French concept of deep nuclear wastes repository, the galleries should be backfilled with excavated argillite after the site exploitation period. After several thousands of years, the degradation of the concrete lining of the galleries will generate alkaline fluid (pH 】 12) that will diffuse through the backfill. The objective of the paper is to describe the influence of such solute diffusion on the microstructure and the mechanical behavior of compacted argillite. Saturated-portlandite water was circulated through compacted samples for 3, 6 and 12 months at 20 °C or 60 °C, respectively. The microstructures before and after fluid circulation were determined with mercury intrusion porosimetry. Since it was planned to introduce additives (bentonite or lime) in the remoulded argillite to backfill the deep galleries, such mixtures were also studied. The results show that the influence of the alkaline fluid on the properties of the argillite is a function of the nature of the additive. The pure argillite undergoes slight modifications that can be related to a limited dissolution of its clayey particles. Conversely, intense alteration of the bentonite-argillite mixture was observed. Lime addition improves the mechanical characteristics of the argillite through the precipitation of cementitious compounds. 展开更多
关键词 chemo-mechanical couplings alkaline plume ARGILLITE MICROSTRUCTURE shear strength
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Understanding and unveiling the electro-chemo-mechanical behavior in solid-state batteries
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作者 Yunlei Zhong Xia Zhang +4 位作者 Yong Zhang Peng Jia Yuebin Xi Lixing Kang Zhenjiang Yu 《SusMat》 SCIE EI 2024年第2期75-88,共14页
Solid-state batteries(SSBs)are attracting growing interest as long-lasting,thermally resilient,and high-safe energy storage systems.As an emerging area of battery chemistry,there are many issues with SSBs,including st... Solid-state batteries(SSBs)are attracting growing interest as long-lasting,thermally resilient,and high-safe energy storage systems.As an emerging area of battery chemistry,there are many issues with SSBs,including strongly reductive lithium anodes,oxidized cathodes(state of charge),the thermodynamic stability limits of solid-state electrolytes(SSEs),and the ubiquitous and critical interfaces.In this Review,we provided an overview of the main obstacles in the development of SSBs,such as the lithium anode|SSEs interface,the cathode|SSEs interface,lithium-ion transport in the SSEs,and the root origin of lithium intrusions,as well as the safety issues caused by the dendrites.Understanding and overcoming these obstacles are crucial but also extremely challenging as the localized and buried nature of the intimate contact between electrode and SSEs makes direct detection difficult.We reviewed advanced characterization techniques and discussed the complex ion/electron-transport mechanism that have been plaguing electrochemists.Finally,we focused on studying and revealing the coupled electro-chemo-mechanical behavior occurring in the lithium anode,cathode,SSEs,and beyond. 展开更多
关键词 advanced characterization techniques chemo-mechanical effects INTERFACE
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Multi-scale chemo-mechanical analysis of the slip surface of landslides in the Three Gorges, China 被引量:7
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作者 ZHAO Yu CUI Peng +1 位作者 HU LiangBo Tomasz HUECKEL 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第7期1757-1765,共9页
Multi-scale chemo-mechanical effects and microscopic failure modes are explored in the evolution of strength change of slip surface. Direct shear equipments, scanning electro-microscope and X-ray diffraction are used ... Multi-scale chemo-mechanical effects and microscopic failure modes are explored in the evolution of strength change of slip surface. Direct shear equipments, scanning electro-microscope and X-ray diffraction are used to trace the change in strength of remodeled soils of slip surfaces in the Three Gorges area. Results show that there is a release of alkali metals and concentration of clay minerals on the surface. During the tests, potassium ions were released, the cementation was reduced, and the ratio of interlayer minerals varied associated with strength change. Accordingly, illites or montmorillonite-illite mixtures turned into montmorillonite. So the strength change originates from the release of alkali metal ions on molecular scale that leads to the concentration and transition of clay minerals on meso-scale. The evolution of slip surface and soil strength is a typical process involving multi-scale processes of structure changes and chemo-mechanical coupling. 展开更多
关键词 slip surface MULTI-SCALE chemo-mechanical evolution of mineral The Three Gorges China
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ANALYTICAL SOLUTIONS FOR A ONE-DIMENSIONAL CHEMO-MECHANICAL COUPLING PROBLEM 被引量:6
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作者 Qingsheng Yang Hui Tian Qinghua Qin 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2014年第2期137-145,共9页
Chemo-mechanical coupling exists in a lot of intelligent materials including hy- drogels, biological tissues and other soft materials. These materials are able to respond to ex- ternal stimulus, such as temperature, c... Chemo-mechanical coupling exists in a lot of intelligent materials including hy- drogels, biological tissues and other soft materials. These materials are able to respond to ex- ternal stimulus, such as temperature, chemical concentration, and pH value. In this paper, a one-dimensional theoretical model for chemo-mechanical coupling is proposed for analyzing the uniaxial stress/strain state of coupling materials. Based on the chemo-mechanical coupled gov- erning equation, the displacement function and concentration function are derived and the stress and chemical potential are obtained. It is shown that the present chemo-mechanical theory can characterize the chemo-mechanical coupling behavior of intelligent materials. 展开更多
关键词 intelligent materials chemo-mechanical coupling analytical solution theoretical model constitutive equations HYDROGEL
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Chemo-mechanical coupling effect on high temperature oxidation:A review 被引量:1
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作者 FANG XuFei LI Yan +1 位作者 YUE MengKun FENG Xue 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2019年第8期1297-1321,共25页
The rapid development in the field of chemo-mechanical coupling has drawn increasing attention in recent years. Chemomechanical coupling phenomena exist in many research areas, ranging from development of advanced bat... The rapid development in the field of chemo-mechanical coupling has drawn increasing attention in recent years. Chemomechanical coupling phenomena exist in many research areas, ranging from development of advanced batteries, biomechanical engineering, hydrogen embrittlement, and high temperature oxidation, etc. In this review, we attempt to provide an overview of the recent advances in chemo-mechanical coupling study on high temperature oxidation. The theoretical frameworks, computational modeling, and experimental studies on this subject are summarized and discussed. The stress-diffusion coupling effect in diffusion-controlled oxidation process, stress-induced evolution of oxide morphology in microscale experiment, and stressoxidation interaction at crack front for intergranular fracture are highlighted. In addition, potential applications and possible methods via surface engineering for improving oxidation-resistance of high temperature structural materials are briefly discussed. 展开更多
关键词 chemo-mechanical COUPLING high temperature OXIDATION MICROSCALE EXPERIMENT FRACTURE
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Chemo-mechanical coupling effect in the high-temperature oxidation of metal materials: A review 被引量:1
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作者 WANG HaiLong YU WenShan SHEN ShengPing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2019年第8期1246-1254,共9页
The metal materials are susceptible to be oxidized when they are exposed to the complex and harsh environments, especially at the elevated temperature. The development of corresponding chemo-mechanical coupling theory... The metal materials are susceptible to be oxidized when they are exposed to the complex and harsh environments, especially at the elevated temperature. The development of corresponding chemo-mechanical coupling theory is indispensable in theoretically and numerically predicting the material properties reduction and failures due to the oxidation. In this paper, we review the historical sketch of the coupling theory of chemical reactions and mechanics in the high-temperature oxidation of metal materials. The oxidation results in the stress generation while the generated stress in turn affects the chemical reaction rate and the diffusion process of the reactants. It is therefore a complex chemo-mechanical coupling problem. This review begins with the discussion of the diffusion-controlled oxidation, and then discusses the stress-dependent diffussion during the oxidation and the oxide growth induced stress, and ends with the discussion of interaction between chemical reactions and stress. This review of chemo-mechanical coupling literature is not exhaustive;we review much of the fundamental literature and draw comparisons of coupling theory development in the filed of metal oxidation. 展开更多
关键词 OXIDATION DIFFUSION growth STRESS chemo-mechanical COUPLING METAL
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A chemo-mechanical switchable valve on microfluidic chip based on a thermally responsive block copolymer
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作者 Sifeng Mao Xiaohong Hu +6 位作者 Yumi Tanaka Lin Zhou Chenhan Peng Nahoko Kasai Hizuru Nakajima Shungo Kato Katsumi Uchiyama 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第6期3083-3086,共4页
Microfluidic devices have become a powerful tool for chemical and biologic applications.To control different functional parts on the microchip,valve plays a key role in the device.In conventional methods,physio-mechan... Microfluidic devices have become a powerful tool for chemical and biologic applications.To control different functional parts on the microchip,valve plays a key role in the device.In conventional methods,physio-mechanical valves are usually used on microfluidic chip.Herein,we reported a chemo-mechanical switchable valve on microfluidic chip by using a thermally responsive block copolymer.The wettability changes of capillary with copolymer modification on inner surface were investigated to verify the function as a valve.Capillaries with modification of poly-(N-isopropylacrylamide-co-hexafluoroisopropyl acrylate)(P(NIPAAm-co-HFIPA))with a 20%HFIPA was demonstrated capable of control aqueous solution stop or go through.Then short capillaries with copolymer modification were integrated in microchannels as valves.With the temperature changing around lower critical solution temperature(LCST),the integrated chemo-mechanical switchable valve exhibited excellent“OPEN–CLOSE”behavior for microflow control.After optimization of the block copolymer sequences and molar ratio,a switching time as low as 20 s was achieved.The developed micro valve was demonstrated effective for flow control on microchip. 展开更多
关键词 MICROCHIP VALVE Flow control NIPPAm chemo-mechanical switch Thermo-responsive polymer
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Fracture analysis of a plane crack problem under chemo-mechanical loading
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作者 Juntao Shi Zheng Zhong 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第7期109-120,I0003,共13页
Fracture analysis of a plane crack problem under chemo-mechanical loading is presented based on a linear chemo-elasticity model.The flux conductivity is introduced to characterize the influence of the crack defect on ... Fracture analysis of a plane crack problem under chemo-mechanical loading is presented based on a linear chemo-elasticity model.The flux conductivity is introduced to characterize the influence of the crack defect on the diffusion process.Using Fourier transform and the dislocation density functions,the crack problem is reduced to a set of singular integral equations,which are solved numerically by the Lobatto-Chebyshev method.Parametric studies are conducted to reveal the effects of flux conductivity,geometric configuration,chemical and mechanical loads on the crack tip field.The numerical results show that the stress singularity at the crack tip is usually a mixture of mode Ⅰ and mode Ⅱ types. 展开更多
关键词 chemo-mechanical coupling Plane crack Singular integral equations Stress intensity factor
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Degradation of chemical and mechanical properties of cements with different formulations in CO_(2)-containing HTHP downhole environment
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作者 Wei Yan Hao-Guang Wei +3 位作者 Nguu Dickson Muchiri Fu-Li Li Jing-Ru Zhang Zheng-Xian Xu 《Petroleum Science》 SCIE EI CAS CSCD 2023年第2期1119-1128,共10页
The increasing energy demand has pushed oil and gas exploration and development limits to extremely challenging and harsher HTHP (High Temperature and High Pressure) environments. Maintaining wellbore integrity in the... The increasing energy demand has pushed oil and gas exploration and development limits to extremely challenging and harsher HTHP (High Temperature and High Pressure) environments. Maintaining wellbore integrity in these environments, particularly in HPHT reservoirs with corrosive gases, presents a significant challenge. Robust risk evaluation and mitigation strategies are required to address these reservoirs' safety, economic, and environmental uncertainties. This study investigates chemo-mechanical properties degradations of class G oil well cement blended with silica fume, liquid silica, and latex when exposed to high temperature (150 °C) and high partial pressure of CO_(2) saturated brine. The result shows that these admixtures surround the cement grains and fill the interstitial spaces between the cement particles to form a dense crystal system of C–S–H. Consequently, the cement's percentage of pore voids, permeability, and the content of alkali compounds reduce, resulting in increased resistance to CO_(2) corrosion. Liquid silica, a specially prepared silica suspension, is a more effective alternative to silica fume in protecting oil well cement against CO_(2) chemical degradation. Micro-indentation analysis shows a significant deterioration in the mechanical properties of the cement, including average elastic modulus and hardness, particularly in the outer zones in direct contact with corrosive fluids. This study highlights the significance of incorporating admixtures to mitigate the effects of CO_(2) corrosion in HPHT environments and provides a valuable technique for quantitatively evaluating the mechanical-chemical degradation of cement sheath. 展开更多
关键词 HPHT reservoirs Oil well cement CO_(2)corrosion chemo-mechanical Mechanical properties MICRO-INDENTATION
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Stress-Regulation Design of Lithium Alloy Electrode toward Stable Battery Cycling
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作者 Chunhao Li Shuibin Tu +7 位作者 Xin Ai Siwei Gui Zihe Chen Wenyu Wang Xiaoxiao Liu Yuchen Tan Hui Yang Yongming Sun 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第1期184-191,共8页
Metallic tin(Sn)foil is a promising candidate anode for lithium-ion batteries(LIBs)due to its metallurgical processability and high capacity.However,it suffers low initial Coulombic efficiency and inferior cycling sta... Metallic tin(Sn)foil is a promising candidate anode for lithium-ion batteries(LIBs)due to its metallurgical processability and high capacity.However,it suffers low initial Coulombic efficiency and inferior cycling stability due to its uneven alloying/dealloying reactions,large volume change and stress,and fast electrode structural degradation.Herein,we report an undulating LiSn electrode fabricated by a scalable two-step procedure involving mechanical lithography and chemical prelithiation of Sn foil.With the combination of experimental measurements and chemo-mechanical simulations,it was revealed the obtained undulating LiSn/Sn electrode could ensure better mechanical stability due to the pre-swelling state from Sn to Li x Sn and undulating structure of lithography in comparison with plane Sn,homogenize the electrochemical alloying/dealloying reactions due to the activated surface materials,and compensate Li loss during cycling due to the introduction of excess Li from Li_(x)Sn,thus enabling enhanced electrochemical performance.Symmetric cells consisting of undulating LiSn/Sn electrode with an active thickness of∼5 um displayed stable cycling over 1000 h at 1 mA cm^(-2) and 1 mAh cm^(-2) with a low average overpotential of<15 mV.When paired with commercial LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)cathode with high mass loading of 15.8 mg cm^(-2),the full cell demonstrated a high capacity of 2.4 mAh cm^(-2) and outstanding cycling stability with 84.9% capacity retention at 0.5 C after 100 cycles.This work presents an advanced LiSn electrode with stress-regulation design toward high-performance LIBs,and sheds light on the rational electrode design and processing of other high-capacity lithium alloy anodes. 展开更多
关键词 chemo-mechanical simulation lithium alloy lithium-ion batteries mechanical lithography stress regulation
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Surface Polishing of 6H-SiC Substrates 被引量:5
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作者 Xiufang CHEN Xiangang XU Juan LI Shouzhen JIANG Lina NING Yingmin WANG Deying MA Xiaobo HU Minhua JIANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第3期430-432,共3页
The surface polishing for silicon carbide (SIC) substrates was investigated and results were presented for mechanical polishing (MP) and chemo-mechanical polishing (CMP). High quality surfaces were obtained afte... The surface polishing for silicon carbide (SIC) substrates was investigated and results were presented for mechanical polishing (MP) and chemo-mechanical polishing (CMP). High quality surfaces were obtained after CMP with colloidal silica. The removal mechanism of scratches in MP and detailed physical and chemical process during CMP were analyzed. The effects of MP and CMP on the surface roughness were assessed by optical microscopy (OM), atomic force microscopy (AFM) and step profilometry. KOH etching and high resolution X-ray diffractometry (H RXRD) were applied to evaluate the subsurface damage of 6H-SiC substrates. 展开更多
关键词 SIC chemo-mechanical polishing (CMP) ROUGHNESS Subsurface damage
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