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Artigos de revistas sobre o tema "Mechanical-chemical coupling"

Autor: Grafiati

Publicado: 14 de dezembro de 2024

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1

Taniguchi, Yuichi, Masayoshi Nishiyama, Yoshiharu Ishii e Toshio Yanagida. "2P231 Loose coupling between chemical reaction and mechanical work in kinesin(38. Chemo-mechanical coupling,Poster Session,Abstract,Meeting Program of EABS & BSJ 2006)". Seibutsu Butsuri 46, supplement2 (2006): S353. http://dx.doi.org/10.2142/biophys.46.s353_3.

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2

do Nascimento, Rodney Marcelo, Adrien Baldit, Ninel Kokanyan, Lara Kristin Tappert, Paul Lipinski, Antônio Carlos Hernandes e Rachid Rahouadj. "Mechanical-chemical coupling in Temporomandibular Joint disc". Materialia 9 (março de 2020): 100549. http://dx.doi.org/10.1016/j.mtla.2019.100549.

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3

Klika, Václav, e František Maršík. "Coupling Effect between Mechanical Loading and Chemical Reactions". Journal of Physical Chemistry B 113, n.º 44 (5 de novembro de 2009): 14689–97. http://dx.doi.org/10.1021/jp903054y.

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4

ZHANG, YUNXIN. "LOOSE MECHANOCHEMICAL COUPLING OF MOLECULAR MOTORS". Modern Physics Letters B 26, n.º 21 (16 de julho de 2012): 1250137. http://dx.doi.org/10.1142/s0217984912501370.

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In living cells, molecular motors convert chemical energy into mechanical work. Its thermodynamic energy efficiency, i.e. the ratio of output mechanical work to input chemical energy, is usually high. However, using two-state models, we found the motion of molecular motors is loosely coupled to the chemical cycle. Only part of the input energy can be converted into mechanical work. Others are dissipated into environment during substeps without contributions to the unidirectional movement.

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5

Panicaud, Benoit. "On the Use of the Generalized Eigenstrain Method in the Modeling of Coupling between Damage and Corrosion". Applied Mechanics and Materials 784 (agosto de 2015): 59–67. http://dx.doi.org/10.4028/www.scientific.net/amm.784.59.

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The coupling between mechanical and chemical behaviors is investigated. The Generalized Eigenstrain Method is used and enables to take easily into account several couplings, such as damage and corrosion. Modeling is then performed and compared for different configurations. Chemical reactions and diffusion effects are thus described in order to improve accuracy of such a micromechanical time-dependent model. Application is then performed on a steel reinforced concrete material. Moreover, a particular and original coupling has been introduced, which is justified by thermodynamics arguments.

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6

Hu, Dawei, Hui Zhou, Qizhi Hu, Jianfu Shao, Xiating Feng e Haibin Xiao. "A hydro-mechanical-chemical coupling model for geomaterial with both mechanical and chemical damages considered". Acta Mechanica Solida Sinica 25, n.º 4 (agosto de 2012): 361–76. http://dx.doi.org/10.1016/s0894-9166(12)60033-0.

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7

Oh, Seunghee, e Jongwon Seok. "Modeling of chemical–mechanical polishing considering thermal coupling effects". Microelectronic Engineering 85, n.º 11 (novembro de 2008): 2191–201. http://dx.doi.org/10.1016/j.mee.2008.04.037.

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8

Lembong, Josephine, Bo Sun, Matthew Rogers e Howard A. Stone. "Coupling of Chemical and Mechanical Sensing in Fibroblast Cells". Biophysical Journal 106, n.º 2 (janeiro de 2014): 241a. http://dx.doi.org/10.1016/j.bpj.2013.11.1415.

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9

Caruel, Matthieu, Philippe Moireau e Dominique Chapelle. "Stochastic modeling of chemical–mechanical coupling in striated muscles". Biomechanics and Modeling in Mechanobiology 18, n.º 3 (3 de janeiro de 2019): 563–87. http://dx.doi.org/10.1007/s10237-018-1102-z.

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10

Ge, Shangqi, Yue Ma, Kai Wang, Lingwei Zheng, Xinyu Xie, Xiaohui Chen e Hai-Sui Yu. "Unsaturated hydro-mechanical-electro-chemical coupling based on mixture-coupling theory: a unified model". International Journal of Engineering Science 191 (outubro de 2023): 103914. http://dx.doi.org/10.1016/j.ijengsci.2023.103914.

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11

Castelli, Giuseppe F., Lars von Kolzenberg, Birger Horstmann, Arnulf Latz e Willy Dörfler. "Efficient Simulation of Chemical–Mechanical Coupling in Battery Active Particles". Energy Technology 9, n.º 6 (5 de maio de 2021): 2000835. http://dx.doi.org/10.1002/ente.202000835.

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12

Das, Tridip, Jason D. Nicholas, Brian W. Sheldon e Yue Qi. "Anisotropic chemical strain in cubic ceria due to oxygen-vacancy-induced elastic dipoles". Physical Chemistry Chemical Physics 20, n.º 22 (2018): 15293–99. http://dx.doi.org/10.1039/c8cp01219a.

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13

Zhang, Shiyi, e Qiang Shen. "A Phase-Field Regularized Cohesion Model for Hydrogen-Assisted Cracking". Coatings 14, n.º 2 (4 de fevereiro de 2024): 202. http://dx.doi.org/10.3390/coatings14020202.

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Hydrogen-assisted cracking (HAC) usually causes premature mechanical failure of the material and results in structural damage in hydrogen environments. A phase-field regularized cohesion model (PF-CZM) was proposed to address hydrogen-assisted cracking. It incorporated the hydrogen-enhanced decohesion mechanism to decrease the critical energy release rate to address damage initiation and progression in a chemo-mechanical coupled environment. This model is based on coupled mechanical and hydrogen diffusion responses, driven by chemical potential gradients, and the introduction of hydrogen-related fracture energy degradation laws. The coupling problem is solved by an implicit time integral, in which hydrogen concentration, displacement and phase-field order parameters are the main variables. Three commonly used loading regimes (tension, shear, and three-point bending) were provided for comparing crack growth. Specifically, (i) hydrogen-dependent fracture energy degradation, (ii) mechanical–chemical coupling, and (iii) the diffusion coefficient D is influenced by both the phase field and the chemical field. By considering these factors, the PF-CZM model provided a variational framework by coupling mechanical loading with concentration diffusion for studying the complex interplay between a chemo-mechanical coupled environment and material damage, thereby enhancing our understanding of hydrogen-assisted cracking phenomena.

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14

Curà, Francesca, Andrea Mura e Raffaella Sesana. "Experimental investigation of fatigue and aging performance of automotive exhaust flexible couplings". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, n.º 7 (28 de agosto de 2014): 1215–23. http://dx.doi.org/10.1177/0954406214549268.

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In this work, the mechanical strength of automotive exhaust flexible couplings subjected to thermo-mechanical fatigue and corrosion has been investigated. Five different types of flexible coupling have been considered, which is realized by four different metallic materials: three stainless steels (AISI 309, AISI 321, and AISI 321 Ti) and a nickel alloy (Incoloy 825). These components have been tested by a specific procedure developed to reproduce the real working conditions of the flexible joints (mechanical stresses, thermal stresses, and chemical attacks). The aging procedure consisting of different cycles of fatigue, heating and corrosion was performed. The performance of components was compared in terms of variation of both mechanical strength and the effect of corrosion, by means of the critical to quality approaches. The fatigue aging process presented in this work reproduced properly the real damage conditions on automotive flexible coupling, and the analysis of the critical to quality results shows that the best components for this application are those made up of Incoloy 825.

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15

Yan, Chuanliang, Jingen Deng e Baohua Yu. "Wellbore Stability in Oil and Gas Drilling with Chemical-Mechanical Coupling". Scientific World Journal 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/720271.

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Wellbore instability in oil and gas drilling is resulted from both mechanical and chemical factors. Hydration is produced in shale formation owing to the influence of the chemical property of drilling fluid. A new experimental method to measure diffusion coefficient of shale hydration is given, and the calculation method of experimental results is introduced. The diffusion coefficient of shale hydration is measured with the downhole temperature and pressure condition, then the penetration migrate law of drilling fluid filtrate around the wellbore is calculated. Furthermore, the changing rules of shale mechanical properties affected by hydration and water absorption are studied through experiments. The relationships between shale mechanical parameters and the water content are established. The wellbore stability model chemical-mechanical coupling is obtained based on the experimental results. Under the action of drilling fluid, hydration makes the shale formation softened and produced the swelling strain after drilling. This will lead to the collapse pressure increases after drilling. The study results provide a reference for studying hydration collapse period of shale.

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16

Traversari, Gabriele, Andrea Porcheddu, Giorgio Pia, Francesco Delogu e Alberto Cincotti. "Coupling of mechanical deformation and reaction in mechanochemical transformations". Physical Chemistry Chemical Physics 23, n.º 1 (2021): 229–45. http://dx.doi.org/10.1039/d0cp05647b.

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17

YI, Wei, Qiu-hua RAO, Zhuo LI, Dong-liang SUN e Qing-qing SHEN. "Thermo-hydro-mechanical-chemical (THMC) coupling fracture criterion of brittle rock". Transactions of Nonferrous Metals Society of China 31, n.º 9 (setembro de 2021): 2823–35. http://dx.doi.org/10.1016/s1003-6326(21)65696-0.

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18

Xuan, Fu-Zhen, Shan-Shan Shao, Zhengdong Wang e Shan-Tung Tu. "Coupling effects of chemical stresses and external mechanical stresses on diffusion". Journal of Physics D: Applied Physics 42, n.º 1 (4 de dezembro de 2008): 015401. http://dx.doi.org/10.1088/0022-3727/42/1/015401.

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19

Fabre, Nicolas, Stéphane Perrey, Loïc Arbez e Jean-Denis Rouillon. "Neuro-mechanical and chemical influences on locomotor respiratory coupling in humans". Respiratory Physiology & Neurobiology 155, n.º 2 (fevereiro de 2007): 128–36. http://dx.doi.org/10.1016/j.resp.2006.04.015.

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20

Yanagida, T. "Loose coupling between chemical and mechanical reactions in actomyosin energy transduction". Advances in Biophysics 26 (1990): 75–95. http://dx.doi.org/10.1016/0065-227x(90)90008-h.

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21

Zhuang, Yan, Tiantian Zhang, Xiangjun Liu, Shifeng Zhang, Lixi Liang, Jian Xiong e Xiaojian Zhang. "Mechanism of microfracture propagation under mechanical–chemical coupling conditions considering dissolution". Geoenergy Science and Engineering 245 (fevereiro de 2025): 213544. http://dx.doi.org/10.1016/j.geoen.2024.213544.

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22

Kawada, Tatsuya. "(Invited) Chemo-Mechanical Coupling Phenomena in Solid Oxide Fuel Cells". ECS Meeting Abstracts MA2018-01, n.º 32 (13 de abril de 2018): 1930. http://dx.doi.org/10.1149/ma2018-01/32/1930.

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The materials and the structure of solid oxide fuel cells are designed to avoid thermo-mechanical damages under various operation conditions. However, inherent risk of chemo-mechanical failures are still not fully understood. This paper aims to review the recent works related to this topic, and to address some issues which have not been widely recognized. The coupling of chemistry and mechanics are classified into four types, i.e. (1) chemically driven strain, (2) chemically modified mechanical properties, (3) mechanically driven chemical reactions, and (4) mechanically modified chemical (physical) properties. Since chemical energies are much larger than mechanical energy accommodated in SOFC, the former two types (type(1) and (2)) of chemo-mechanical coupling have been recognized as more important than the others, and have been studied intensively. An example of type-1 phenomena is chemical expansion of mixed conducting oxides with e.g. (La,Sr)(Co,Fe)O3 cathode, LaCrO3 based interconnect, and CeO2 based or (La,Sr)(Ga,Mg,Co)O3 electrolytes. Since the transient behavior as well as steady state distribution of oxygen potential inside the constituent solids is essential to know the effect of the chemical strain, Terada et al. developed a computer code “SIMUDEL” of an FEM-based calculation of oxygen potential. This code considers “chemical capacitance” due to nonstoichiometry of the materials to treat the transient responses, and the results of the calculation can be transported into some of major commercial programs for structure analysis. Volume change of a nickel cermet anode is also an important feature of type-1 coupling which must be considered in determining fabrication and operation processes. The electrode shrinks on reduction and expands on re-oxidation as expected from the lattice size of the metal and the oxide. However, under certain conditions, a porous cermet was found to “shrink” upon oxidation. It took place only during light re-oxidation around 400C. Under this condition the formation of NiO was not obvious from XRD, whereas weight gain was observed by thermo-gravimetry. Careful observation of the microstructure of a porous Ni revealed that, upon shrinkage, the particle-to-particle separation changed partly due to the neck growth between the particles and to the change of the connection angle of the particles. Further study is underway to elucidate the detailed mechanism of the oxidation-induced shrinkage. The change of mechanical properties such as elastic moduli and fracture strength are also dependent on defect concentration and its motion in the lattice (type-2 coupling). Young’s modulus of nonstoichiometric oxides show dependences not only on temperature but also on pO2 through the change of defect concentration. Also, domain boundary shift of ferroelastic phase of LSCF was found to be correlated with the defect concentration. As is discussed for the anomaly of Young’s modulus of YSZ around 400˚C, the motion of oxide ion vacancies may also have correlation with the ferroelastic strain observed with Sc and Ce doped ZrO2 electrolyte above 300˚C. Another interesting type-2 coupling is with the lightly oxidized Ni cermet electrode. It was found that the creep rate of Ni-YSZ cermet at 400˚C was dramatically increased when oxygen-containing gas was introduced. This may be by a correlated mechanism with the above mentioned oxidation induced shrinkage. Several reports, including those from our group, have been published on the effect of mechanical stress on defect formation (type-3 coupling) of nonstoichiometric oxides determined by experiments or by calculation. As is expected from thermodynamic consideration, the experimentally determined effect was not large, e.g. 1G Pa stress was equivalent to 1/5 order of magnitude shift of chemical potential of oxygen for nonstoichiometry of LSCF. Similarly, only minor effect on a practical system was reported for type-4 coupling. However, those phenomena can have significant effect on long-term stability if cation mobility and their driving force are modified at a strained interfaces or grain boundaries.

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23

De Corato, Marco, e Ignacio Pagonabarraga. "Onsager reciprocal relations and chemo-mechanical coupling for chemically active colloids". Journal of Chemical Physics 157, n.º 8 (28 de agosto de 2022): 084901. http://dx.doi.org/10.1063/5.0098425.

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Similar to cells, bacteria, and other micro-organisms, synthetic chemically active colloids can harness the energy from their environment through a surface chemical reaction and use the energy to self-propel in fluidic environments. In this paper, we study the chemo-mechanical coupling that leads to the self-propulsion of chemically active colloids. The coupling between chemical reactions and momentum transport is a consequence of Onsager reciprocal relations. They state that the velocity and the surface reaction rate are related to mechanical and chemical affinities through a symmetric matrix. A consequence of Onsager reciprocal relations is that if a chemical reaction drives the motion of the colloid, then an external force generates a reaction rate. Here, we investigate Onsager reciprocal relations for a spherical active colloid that catalyzes a reversible surface chemical reaction between two species. We solve the relevant transport equations using a perturbation expansion and numerical simulations to demonstrate the validity of reciprocal relations around the equilibrium. Our results are consistent with previous studies and highlight the key role of solute advection in preserving the symmetry of the Onsager matrix. Finally, we show that Onsager reciprocal relations break down around a nonequilibrium steady state, which has implications for the thermal fluctuations of the active colloids used in experiments.

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24

Tang, Quan, Qing Yu Lin, Zhi Zhang e You Wang. "Research on Preparation of Heavy Calcium Carbonate Functional Filler with Mechanical Chemical Methods". Advanced Materials Research 1089 (janeiro de 2015): 354–58. http://dx.doi.org/10.4028/www.scientific.net/amr.1089.354.

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Ultra-fine heavy calcium carbonate functional filler was prepared by aluminum titanium complex coupling agent with mechanical chemical methods and characterized by IR and SEM. The results show that the optimum conditions of mechanical chemistry preparation of heavy calcium carbonate functional filler: the modifier dosage is 1% (mass fraction), the milling time is 2.5h, and grinding ball ratio is 35:45. Under the optimal conditions, the activated degree of heavy calcium carbonate is 99.5%, the particle size of D50is 4.56μm, and D90is 9.72μm. FIR and SEM analysis show that the surface of modified heavy calcium carbonate has been coated aluminum and titanium complex coupling agent.

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25

Liu, Wenyuan, Wei Xia e Shengping Shen. "Fully Coupling Chemomechanical Yield Theory Based on Evolution Equations". International Journal of Applied Mechanics 08, n.º 04 (junho de 2016): 1650058. http://dx.doi.org/10.1142/s1758825116500587.

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Coupling chemomechanical yield is one of the key issues in the oxidation of metal and polymer matrix materials. In this paper, the evolving equations for fully coupled thermal–chemical–mechanical processes were derived using the theory of thermodynamics. Then, the coupled chemomechanical yield condition and flow rule were directly obtained from the evolution equations by extending the von Mises theory of plasticity. The coupled yield condition reveals that only the chemical reactions or diffusions may lead to the yield of material even without the mechanical stress, which significantly differs from the previous works. In addition, the currently proposed yield condition combined with the flow rule as a new criterion, may be applicable in predicting the durability of materials within the allowed plastic deformation resulted from time dependent diffusion and chemical reactions. Particular attention is paid to the isothermal systems and isotropic materials for simplicity. Finally, three examples on how the deformation and reaction evolves simultaneously were given to show the applications of the present theory.

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26

Ding, Wu Xiu, Xia Ting Feng e Bing Rui Chen. "Study on the Mechanical Property and the Evolutionary Neural Network Constitutive Model for Limestone under Chemical Corrosive Environments". Key Engineering Materials 340-341 (junho de 2007): 1169–74. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.1169.

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In this paper, the experimental study on the mechanical property of limestone under triaxial compression with different hydrochemical environments is conducted and the non-linear characteristics of complete stress-strain process of limestone subjected to chemical corrosion, are analyzed. The behaviors of deformation and strength of limestone eroded by different chemical solutions are obtained. It is known from the experimental and analytical results that different chemical environments such as chemical composition, pH value etc can affect the mechanical property of rock differently. How to establish a multifactor characteristic constitutive model which can reflect different chemical environments is the key problem to study the coupling corrosion effect of stress and chemistry of rock. The constitutive model of evolutionary neural network for rock under chemical corrosive environments is put forward, and the neural network constitutive relationship under stress-chemistry coupling corrosion is established by applying the theory of evolutionary computation and neural network. The neural network constitutive model established in this presented paper mainly takes into account the following three aspects: chemical environments of rock specimens, content of main mineral compositions that are liable to being eroded by chemical solution, and mechanical environments. The results are in good agreement with the experimental data.

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27

Rios, E., e G. Pizarro. "Voltage Sensors and Calcium Channels of Excitation-Contraction Coupling". Physiology 3, n.º 6 (1 de dezembro de 1988): 223–27. http://dx.doi.org/10.1152/physiologyonline.1988.3.6.223.

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Three mechanisms are proposed for the transduction from action potential to Ca2+ release from the sarcoplasmic reticulum in skeletal muscle: Chemical mediation, a mechanical connection between transverse tubular membrane and sacroplasmic reticulum, and Ca2+-induced release of Ca2+. New biochemical, biophysical, and structural data favor a mechanical connection and add the possibility that Ca2+-induced Ca2+-release is working in parallel.

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28

Whittaker, Michael L., Laura N. Lammers, Sergio Carrero, Benjamin Gilbert e Jillian F. Banfield. "Ion exchange selectivity in clay is controlled by nanoscale chemical–mechanical coupling". Proceedings of the National Academy of Sciences 116, n.º 44 (16 de outubro de 2019): 22052–57. http://dx.doi.org/10.1073/pnas.1908086116.

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Ion exchange in nanoporous clay-rich media plays an integral role in water, nutrient, and contaminant storage and transport. In montmorillonite (MMT), a common clay mineral in soils, sediments, and muds, the swelling and collapse of clay particles through the addition or removal of discrete molecular layers of water alters cation exchange selectivities in a poorly understood way. Here, we show that ion exchange is coupled to the dynamic delamination and restacking of clay layers, which creates a feedback between the hydration state of the exchanging cation and the composition of the clay interlayer. Particles with different hydration states are distinct phases with unique binding selectivities. Surprisingly, equilibrium achieved through thermal fluctuations in cation concentration and hydration state leads to the exchange of both ions and individual MMT layers between particles, a process we image directly with high-resolution transmission electron microscopy at cryogenic conditions (cryo-TEM). We introduce an exchange model that accounts for the binding selectivities of different phases, which is likely applicable to many charged colloidal or macromolecular systems in which the structural conformation is correlated with the activities of water and counterions within spatially confined compartments.

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29

Poulet, T., A. Karrech, K. Regenauer-Lieb, L. Fisher e P. Schaubs. "Thermal–hydraulic–mechanical–chemical coupling with damage mechanics using ESCRIPTRT and ABAQUS". Tectonophysics 526-529 (março de 2012): 124–32. http://dx.doi.org/10.1016/j.tecto.2011.12.005.

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30

Wang, Jun, Diao Yang e Huan Liu. "Simulation study on erosion of barrel under thermal-mechanical-chemical coupling environment". Journal of Physics: Conference Series 2478, n.º 7 (1 de junho de 2023): 072056. http://dx.doi.org/10.1088/1742-6596/2478/7/072056.

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Abstract Artillery is known as the “God of War”. When the ballistic performance of the barrel is reduced to the allowable value specified by the index due to erosion and wear, the life of the barrel is terminated, and the artillery equipment completely loses its combat effectiveness. The erosion and wear of the barrel involves many factors such as temperature, mechanics, chemistry. In this paper, based on the theory of internal ballistics and heat conduction, the temperature gradient distribution law of the inner wall of the barrel during the firing process of large-caliber artillery is simulated and calculated. Combined with Fick’s second law and the theory of metal phase transition, The relationship between the [C] content in the thermochemically affected layer of the barrel and the number of firing, the relationship between the thickness of the thermally affected layer and the explosion temperature of the propellant and the temperature of the inner wall were quantitatively analyzed. On this basis, the anatomical analysis of different parts of the barrel after firing verified the accuracy of the erosion model, quantitatively revealed the barrel erosion mechanism, and clarified the direction for the life improvement of large-caliber artillery barrels.

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31

Liu, Yu, Hongtao Gu, Bin Zhao, Zhiyi Leng, Jian Yin e Shengfang Zhang. "Fatigue Life Analysis of Hydrogen Production Reactor Welds Under Thermal-mechanical-chemical Coupling". Advances in Engineering Technology Research 9, n.º 1 (2 de janeiro de 2024): 269. http://dx.doi.org/10.56028/aetr.9.1.269.2024.

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Hydrogen production reactor are subject to performance degradation problems in the complex environment of high temperature, high pressure and exposed to hydrogen atmosphere. The welds, being weak parts, are susceptible to fatigue damage under the influence of loads such as temperature, pressure and hydrogen penetration. In this paper, we focus on the fatigue life analysis of welds in hydrogen production reactor, taking into account the complex working conditions of thermal-mechanical-chemical coupling. Based on the Fe-safe fatigue analysis software, the stress variation of the welds under multi-field coupling was used as a cyclic load and the fatigue life was predicted using the stress-life method. Respectively, the fatigue life variation law of the weld region was studied at different temperatures, pressures, and hydrogen penetration conditions. The results show that the lowest fatigue life of the welds are concentrated in the vicinity of the fusion zone, with hydrogen penetration and temperature variations having a larger impact on the fatigue life, followed by pressure.

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32

Sinar, A. A., B. I. Sea e Daud Yusrina Mat. "The Effect of Chemical Modification on Properties of Polypropylene/Bagasse Fiber Composites Compounding Using Two Roll Mill". Advanced Materials Research 795 (setembro de 2013): 611–15. http://dx.doi.org/10.4028/www.scientific.net/amr.795.611.

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This study is concerned on chemical modification of bagasse fiber (BF) filled polypropylene (PP) composites compounding using two roll mill. The fibers were chemically modified with different chemical treatment (alkaline, acetic acid and silane coupling agent). Effect of chemical modification towards BF/PP composites was evaluated by tensile test and flexural test. The chemical modification efficiency was verified by Fourier Transform Spectrometer (FTIR) analysis. From FTIR analysis, there is an increase on intensity on acetyl group (C-H) indicated the existing of chemical bonding between PP and BF. Chemical modified composites increased the mechanical behavior. Composites that modified with acetylation (acetic acid) shows better mechanical properties compared to others.

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Lendvai, László, e Dávid Brenn. "Mechanical, Morphological and Thermal Characterization of Compatibilized Poly(lactic acid)/Thermoplastic Starch Blends". Acta Technica Jaurinensis 13, n.º 1 (14 de fevereiro de 2020): 1–13. http://dx.doi.org/10.14513/actatechjaur.v13.n1.532.

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A two-step compounding procedure was used to produce binary blends composed of poly(lactic acid) (PLA) and thermoplastic starch (TPS) with varying component ratios. Subsequently, three different chemical connectors were introduced in order to enhance the interfacial adhesion between the PLA and the TPS. Maleic anhydride, blocked isocyanate, and chain extender were used as coupling agents. Mechanical, morphological and thermal properties of PLA/TPS blends were determined. It was revealed that the initial interfacial adhesion between the components is weak. Out of the three coupling agents introduced, the chain extender proved to be the most effective, however, the improvement achieved in the mechanical properties was still marginal. According to the thermogravimetric analysis thermal stability was not significantly affected by any of the coupling agents.

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Sethi, Rashmi Ranjan, e Shakti Prasanna Khadanga. "Mechanical and Thermal Characterization of Bauhinia Vahlii Reinforced PP Composite". YMER Digital 21, n.º 07 (31 de julho de 2022): 1395–411. http://dx.doi.org/10.37896/ymer21.07/b6.

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In today’s scenario, natural fibers are used over synthetic fibers in fibers reinforced composites. Forthis present analysis, polypropylene composites with the content of Bauhinia vahlii stem fibers 10 wt% to 30 wt% will be prepared via Compression Moulding and characterised. The bauhinia vahlii stem fibers were modified with different chemical drafting and characterized. The mechanical, chemical, thermal and morphological analysis of the fiber as well as the composites will be carried out. KEYWORDS Bauhinia Vahlii Reinforced PP CompositePolypropylene Resin Mechanical and Thermal CharacterizationBV Fibers Coupling Agent

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35

Chen, XiaoHui, William Pao, Steven Thornton e Joe Small. "Unsaturated hydro-mechanical–chemical constitutive coupled model based on mixture coupling theory: Hydration swelling and chemical osmosis". International Journal of Engineering Science 104 (julho de 2016): 97–109. http://dx.doi.org/10.1016/j.ijengsci.2016.04.010.

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Suo, Yaohong, Hai Hu e Jin Liu. "Fully chemo‐mechanical coupling analysis of a spherical electrode with reversible chemical reaction". International Journal of Energy Research 45, n.º 6 (19 de janeiro de 2021): 9667–76. http://dx.doi.org/10.1002/er.6430.

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Ma, Tianshou, e Ping Chen. "A wellbore stability analysis model with chemical-mechanical coupling for shale gas reservoirs". Journal of Natural Gas Science and Engineering 26 (setembro de 2015): 72–98. http://dx.doi.org/10.1016/j.jngse.2015.05.028.

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Cui, Lizhuang, Nan Qin, Shuai Wang e Xuezhi Feng. "Experimental Study on the Mechanical Properties of Sandstone under the Action of Chemical Erosion and Freeze-Thaw Cycles". Advances in Civil Engineering 2021 (1 de março de 2021): 1–14. http://dx.doi.org/10.1155/2021/8884079.

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In order to study the mechanical properties of sandstone under the coupling action of chemical erosion and freeze-thaw cycles, the fine-grained yellow sandstone in a mining area in Zigong, China, is collected as the research object. The changes in mechanical properties of yellow sandstone under the coupling action of chemical solution erosion and freeze-thaw cycles are analyzed based on uniaxial compression tests (UCTs) and triaxial compression tests (TCTs). The results show that, with the increase in freeze-thaw cycles, the compressive strength, elastic modulus, and cohesion of the sandstone samples decrease with varying degrees. Under constant freeze-thaw cycles, the most serious mechanical properties of degradation are observed in acidic solution, followed by alkaline solution and neutral solution. Under different confining pressures, the compressive strength and elastic modulus of the sandstone samples decrease exponentially with the increase in freeze-thaw cycles. Under the action of the chemical solution erosion and freeze-thaw cycles, the internal friction angle fluctuates around 30°. For the cohesion degradation, 35.4%, 29.3%, and 27.2% degradation are observed under acidic, alkaline, and neutral solutions. Nuclear magnetic resonance imaging shows that the chemical erosion and freeze-thaw cycles both promote the degradation of rock properties from surface to interior; after 45 freeze-thaw cycles, the mechanical properties drop sharply. To properly design rock tunneling support and long-term protection in the cold region, the impact of both freeze-thaw cycles and chemical erosion should be considered.

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Liu, Yin, Hao Li e Haifeng Wu. "Experimental Study on Mechanical Properties of Cemented Paste Backfill under Temperature-Chemical Coupling Conditions". Advances in Materials Science and Engineering 2019 (16 de novembro de 2019): 1–10. http://dx.doi.org/10.1155/2019/9754790.

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To investigate the effect of temperature-chemical coupling on the mechanical properties of cemented paste backfill, three temperatures (20°C, 35°C, and 50°C) and sodium sulfate solution mass concentrations (3%, 5%, and 7%) are applied to simulate the complex environment in a mine. Uniaxial compressive strength and the CPB stress-strain relationship are investigated by applying stress, and the deterioration mechanism was analyzed theoretically according to physical and chemical reactions. At the same time, a structural model of the CPB deterioration mechanism under TC coupling is constructed. Combined with analysis through X-ray diffraction and scanning electron microscopy, it is shown that ettringite and gypsum are the main erosive substances that destroy the structure of CPB and that increased temperatures accelerate the chemical reaction. The concentration change consumes calcium hydroxide, changing the relationship between ettringite and gypsum. Sodium sulphate crystallization is the main form of physical deterioration. The continuous load accelerates the inelastic deformation time of CPB, resulting in a large yield deformation process.

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Gao, Xiang, Daining Fang e Jianmin Qu. "A chemo-mechanics framework for elastic solids with surface stress". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, n.º 2182 (outubro de 2015): 20150366. http://dx.doi.org/10.1098/rspa.2015.0366.

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Elasticity problems involving solid-state diffusion and chemo-mechanical coupling have wide applications in energy conversion and storage devices such as fuel cells and batteries. Such problems are usually difficult to solve because of their strongly nonlinear characteristics. This study first derives the governing equations for three-dimensional chemo-elasticity problems accounting for surface stresses in terms of the Helmholtz potentials of the displacement field. Then, by assuming weak coupling between the chemical and mechanical fields, a perturbation method is used and the nonlinear governing equations are reduced to a system of linear differential equations. It is observed from these equations that the mechanical equilibrium equations of the first two orders are not dependent on the chemical fields. Finally, the above chemo-mechanics framework is applied to study the stress concentration problem of a circular nano-hole in an infinitely large thick plate with prescribed mechanical and chemical loads at infinity. Explicit expressions up to the third order are obtained for the stress and solute concentration fields. It is seen from these solutions that, different from the classical elasticity result, the stress concentration factor near the nano-hole depends on the surface stress, applied tensile load and prescribed solute concentration at infinity.

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Margavi, Mohammad Reza Amiri, Mohammad Talaeipour, AmirHooman Hemmasi, Behzad Bazyar e Ismaeil Ghasemi. "Fabrication of novel biocomposite made of chemically treated sludge fibers and various molecular weight polypropylene". BioResources 18, n.º 2 (28 de março de 2023): 3479–95. http://dx.doi.org/10.15376/biores.18.2.3479-3495.

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The effect of the chemical treatment of paper mill sludge fibers and polypropylene molecular weight were studied relative to the physical, mechanical, and morphological properties of a novel cellulosic biocomposite. Paper mill sludge fibers were treated with acetic anhydride, and succinic anhydride was mixed with maleic anhydride polypropylene (MAPP) and coupling agent (0 and 3%). The ratio of fibers and polymer materials was considered 30 to 70, which was manufactured by the hot-pressing method at 180 °C. Water absorption, volume swelling, and contact angle were examined on each specimen according to ASTM standards, while Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) explored the efficiency of chemical modification of fibers and the morphology of biocomposites, respectively. The results showed that chemical treatment of fibers reduced the water absorption and volumetric swelling. Both tensile and flexural strength were increased with chemical treatment using the coupling agent. Comparison of fibers treated with succinic acid and acetic acid showed that the succinic acid enhanced the mechanical properties better than the acetic acid treatment. Finally, FTIR analysis showed that the hydroxyl groups decreased, and SEM images indicated the interface between fibers and polypropylene improved via chemical treatment of sludge fibers.

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Anyszka, Rafal, Karolina Beton, Maja Szczechowicz, Dariusz M. Bielinski e Anke Blume. "VELCRO-INSPIRED SUPRAMOLECULAR SYSTEM FOR SILICA–RUBBER COUPLING". Rubber Chemistry and Technology 93, n.º 4 (1 de outubro de 2020): 672–82. http://dx.doi.org/10.5254/rct.20.79966.

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ABSTRACT The state-of-the-art silica–rubber coupling is based on forming chemical links between a silica surface and rubber macromolecules. However, the chemical links are relatively short and stiff, thus in case of a chemical breakage they are highly unlikely to recombine. This could result in a potential deterioration of the interphase properties over time. To overcome this drawback, a new approach to silica–rubber coupling was investigated in the current study. The new approach is inspired by the Velcro hook-and-loop system from nature that facilitates a re-connectability, thus re-formation of the interphase properties in case of a breakage. For this, various long oligomeric brushes were grafted onto silica surfaces considered to act as supramolecular hooks. Such modified silica were dispersed in rubber and vulcanized. The resulting cross-linked rubber matrix is considered to act as supramolecular loops. The prepared vulcanizates were compared with reference samples containing common coupling or covering agents. The reinforcing potential provided by the newly developed system is lower than the chemical coupling system but considerably higher than the covering system. The new system also provides better mechanical properties, recovery after cycling stretching, and heat treatment than the references. A new reinforcing mechanism is proposed for the silica grafted with oligomeric brushes that exhibits a good chemical compatibility to the rubber matrix.

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Li, Guangsong. "Surface Damage Coupling Mechanism of Plain Weave Art Ceramic Matrix Composites". Journal of Chemistry 2022 (27 de maio de 2022): 1–7. http://dx.doi.org/10.1155/2022/3519967.

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In order to solve the problem of the surface damage coupling mechanism of ceramic matrix composites, a method oriented to the damage coupling mechanism of the plain weave art ceramic matrix is proposed by the author. First, the author uses the composite material prepared by a chemical vapor infiltration process as the research object, and the damage mechanical behavior of materials under simple and complex plane stress states is studied. Second, the calculation of the mechanical property parameters of the material components and the research on the mechanical behavior of the material in-plane shear mesodamage are studied; Finally, the research on the damage coupling effect of materials under complex stress state is conducted, as well as the decoupling test research of the damage coupling effect. It is demonstrated that based on 0 and 45° off-axis tensile stress-strain behavior, a prediction model of off-axis tensile stress-strain behavior of the material was established, and the prediction results were in good agreement with the experimental results.

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Wu, Gang, Alan Wong e Suning Wang. "Solid-state 25Mg NMR, X-ray crystallographic, and quantum mechanical study of bis(pyridine)-(5,10,15,20-tetraphenyl porphyrinato)magnesium(II)". Canadian Journal of Chemistry 81, n.º 4 (1 de abril de 2003): 275–83. http://dx.doi.org/10.1139/v03-036.

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We report solid-state 25Mg NMR, X-ray crystallographic, and quantum-mechanical calculation results for bis(pyridine)(5,10,15,20-tetraphenylporphyrinato)magnesium(II), Mg(TPP)·Py2. Mg(TPP)·Py2 crystallizes in the triclinic form, in the space group P[Formula: see text]. The unit cell parameters are: a = 9.6139(13) Å, b = 11.0096(16) Å, c = 11.8656(15) Å; α = 102.063(3)°, β = 103.785(3)°, γ = 114.043(2)°; Z = 1. The Mg(II) ion is coordinated to four nitrogen atoms from the porphyrin ring and two nitrogen atoms from the axial pyridine ligands, forming a regular octahedron. The 25Mg quadrupole coupling constant (CQ) is 15.32 ± 0.02 MHz, which represents the largest value so far observed for 25Mg nuclei. The electric field gradient tensor at the Mg site is axially symmetric, ηQ = 0.00 ± 0.05. The 25Mg chemical shielding anisotropy is too small to be accurately determined. Quantum-mechanical calculations using a 631G(d) basis set reproduce reasonably well the observed 25Mg NMR data for Mg(TPP)·Py2. The calculations also suggest that the span of the 25Mg chemical shift tensor is less than 50 ppm. Using a theoretical approach, we also investigate the dependence of the 25Mg quadrupole coupling constant on the MgNax bond distance. The calculation suggests that the 25Mg quadrupole coupling constant for an Mg(II) ion at the center of a porphyrin ring without axial ligands is approximately 22 MHz, which may be treated as an upper limit of the 25Mg quadrupole coupling constant for all Mgporphyrin complexes.Key words: 25Mg NMR, crystal structure, quantum chemical calculation, quadrupole parameter, tetraphenylporphyrin.

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Raja, Shilpa N., Jessica G. Swallow, Sean R. Bishop, Yen-Ting Chi, Ting Chen, Nicola H. Perry, Harry L. Tuller e Krystyn J. Van Vliet. "Analysis of Electrochemomechanical Coupling in Non-Stoichiometric Oxide Thin Films". ECS Meeting Abstracts MA2018-01, n.º 32 (13 de abril de 2018): 1933. http://dx.doi.org/10.1149/ma2018-01/32/1933.

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Non-stoichiometric oxides are used in a wide variety of applications including solid oxide fuel cells (SOFCs), lithium ion batteries (LIBs), gas sensors, and catalysis. Through the capacity of such materials to support large point defect concentrations, these functional oxides can readily store, transport, and exchange ions. An important consequence of this non-stoichiometry is a tendency toward chemomechanical coupling, particularly in the form of chemical expansion, or the coupling between material volume and defect concentration. Thin films of non-stoichiometric oxides are of particular interest in such device designs, given the potential for strain engineering. For example, it has been shown for several materials that tensile strain can increase the ionic conductivity or gas exchange reactivity for oxygen by up to an order of magnitude, potentially enabling enhanced device efficiency or decreased operating temperatures1. In electrochemical devices, chemical expansion can generate stress or strain that can lead to mechanical failure, and/or changes in mechanical properties including elastic moduli. Given the extreme environments and range of non-stoichiometric oxides in which chemical expansion can be expected, robust device design requires accurate, flexible, and rapid characterization of environmental conditions and materials that maximize (or minimize) chemical expansion in situ. However, methods used at present for characterizing chemomechanical expansion, such as dilatometry, synchrotron techniques, reflectometry, and others, are not amenable to thin films or are difficult to implement in standard laboratory settings. Recently, Swallow et al. described an approach for characterizing thin film non-stoichiometric oxide chemical expansion at high temperatures by way of electrochemically induced actuation that addresses the above needs2. That work characterized volume change within a fluorite film of PrxCe1-xO2-δ (PCO) and structural deflection of the PCO/YSZ (yttria-stablized zirconia) bilayer during electrochemical pumping of oxygen ions into the PCO film. It also demonstrated a positive attribute of such chemical expansion in the form of high temperature oxide actuators, which harness electrochemically generated chemical strain to produce measurable, nanoscale device deflections. The actuation produced ranged between 5-15 nm of displacement amplitude depending on the experimental conditions2. Here, we provide an extended and graphically rich analysis of electrical and mechanical response data from such experiments. We model the current and mechanical response of PCO to an electrochemical driving force using previously established defect equilibria and kinetic relationships for that oxide, demonstrating the contributions that material properties and sample geometries make to device deflection and electrochemical pumping. We also extend the measurement approach to an additional material system, the perovskite-structured oxide SrTi0.65Fe0,35O3-δ (STF) used as part of magnetic memory devices, gas transport membranes, and fuel cells. This case study demonstrates the broad applicability of this measurement method, as well as means to leverage chemical expansion effects at elevated temperatures for diverse actuating and functional devices. Yildiz, B. ‘Stretching’ the energy landscape of oxides—Effects on electrocatalysis and diffusion. MRS Bull. 39, 147–156 (2014). Swallow, J. G. et al. Dynamic chemical expansion of thin-film non-stoichiometric oxides at extreme temperatures. Nat Mater (2017). doi:10.1038/nmat4898

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Yu, Jingbo, Zikun Hong, Xinjie Yang, Yu Jiang, Zhijiang Jiang e Weike Su. "Bromide-assisted chemoselective Heck reaction of 3-bromoindazoles under high-speed ball-milling conditions: synthesis of axitinib". Beilstein Journal of Organic Chemistry 14 (6 de abril de 2018): 786–95. http://dx.doi.org/10.3762/bjoc.14.66.

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A mechanically-activated chemoselective Heck coupling for the synthesis of 3-vinylindazoles has been developed with the aid of catalytic amounts of TBAB and NaBr as both dehalogenation restrainer and grinding auxiliary. After tuning of the chemical conditions and mechanical parameters, a series of non-activated 3-bromoindazoles and a broad scope of olefins worked well to give the corresponding coupling products in good to excellent yields. A further application of this protocol was performed in a two-step mechanochemical Heck/Migita cross coupling, which provided a highly efficient route for the synthesis of axitinib.

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Ahn, Byungkyu, Jong-Yeop Lee, Donghyuk Kim, Il Jin Kim, Sangwook Han e Wonho Kim. "EFFECTS OF SILANE AGENTS AND CURING TEMPERATURES ON VULCANIZATE STRUCTURES". Rubber Chemistry and Technology 93, n.º 2 (17 de setembro de 2019): 414–28. http://dx.doi.org/10.5254/rct.19.80445.

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ABSTRACT Silane coupling agents are commonly used in silica-filled rubber compounds to hydrophobize the silica surface and improve filler–rubber interaction. The coupling agent bis[3-(triethoxysilyl)propyl]tetrasulfide (TESPT) is the most widely used coupling agent. The tetrasulfide is more reactive than the disulfide in bis[3-(triethoxysilyl)propyl]disulfide (TESPD) due to its low decomposition energy, resulting in more coupling reaction with rubber molecules. Meanwhile, vulcanization temperature affects chemical networks. Polysulfide is vulnerable to heat, so it can be easily broken to form shorter crosslinks. Compounds with TESPD or TESPT were vulcanized at 160 and 180 °C. In addition to the decomposition, the reactivity of the silanes was confirmed from the cure characteristics of the compounds without the curatives. TESPD could also cause a coupling reaction without the curatives such as TESPT known to release free sulfur. By analyzing vulcanizate structures, total crosslink density was separated into chemical crosslink density and filler–rubber networks. Applying TESPT or vulcanizing at 180 °C increased the filler–rubber networks, and the higher vulcanization temperature decreased the chemical crosslink density. By correlating physical properties, effects of the vulcanizate structures on performance of tread compounds were investigated. The filler–rubber interaction was dominant for wet traction and mechanical properties in tensile test. The chemical crosslink density affected rolling resistance.

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ZHAO, TONG-JUN, YONG-HONG WANG, HAI-LONG AN, YONG ZHAN, WEI-LI YAN e YI-ZHONG ZHUO. "MECHANOCHEMICAL COUPLING OF MOLECULAR MOTORS WITH NONCONSERVATIVE FORCE". International Journal of Modern Physics B 18, n.º 17n19 (30 de julho de 2004): 2762–65. http://dx.doi.org/10.1142/s0217979204026056.

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The biochemical process for coupling between hydrolysis of ATP and the performance of mechanical work involves a sequence of events. Here we present a two-dimensional ratchet model with a non-conservative impulsive force field. The non-conservative impulsive force that represents the chemical energy consumed in the conformation changing process provides a source of non-equilibrium fluctuation, which is a crucial factor for the Brownian motors and can lead to macroscopic motion.

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Wang, Yueyi, Hai Shi, Xuanhong Hao, Hongxi Liu e Xiaowei Zhang. "Microstructure and Wear Resistance of Fe60 Laser Cladding Coating Assisted by Steady Magnetic Field–Mechanical Vibration Coupling Field". Coatings 12, n.º 6 (31 de maio de 2022): 751. http://dx.doi.org/10.3390/coatings12060751.

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Fe60 laser cladding coating was prepared on the surface of 45 steel with the assistance of alternating magnetic field–mechanical vibration coupling field. The XRD results show that the coating is mainly composed of solid solution Ni-Cr-Fe, (Fe, Ni), and Fe-Cr and also contains a certain amount of Cr2Fe14C hard phase. In the process of laser cladding, the chemical composition of the coating is not affected by the coupling field. Under the interaction of the coupling field, the liquid metal in the molten pool is fully stirred; the heat diffusion in the molten pool is accelerated; the temperature gradient in front of the solid–liquid interface decreases; and the large-size dendrites are broken. Those contribute to the grains being refined significantly in the coating. In addition, the content of Cr2Fe14C hard phase in the coating is increased under the coupling field. The maximum microhardness of the coating can reach 702 HV0.2, and the corrosion rate of the coating is the lowest under the coupling field, while the weight loss of the 45 steel surface with the action of the coupling field is 68.9% lower than that without coupling field. The laser cladding technology assisted by alternating magnetic field–mechanical vibration coupling field can promote the development of a wear-resistant coating field.

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Kubo, Yusuke, Kentarou Baba, Michinori Toriyama, Takunori Minegishi, Tadao Sugiura, Satoshi Kozawa, Kazushi Ikeda e Naoyuki Inagaki. "Shootin1–cortactin interaction mediates signal–force transduction for axon outgrowth". Journal of Cell Biology 210, n.º 4 (10 de agosto de 2015): 663–76. http://dx.doi.org/10.1083/jcb.201505011.

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Motile cells transduce environmental chemical signals into mechanical forces to achieve properly controlled migration. This signal–force transduction is thought to require regulated mechanical coupling between actin filaments (F-actins), which undergo retrograde flow at the cellular leading edge, and cell adhesions via linker “clutch” molecules. However, the molecular machinery mediating this regulatory coupling remains unclear. Here we show that the F-actin binding molecule cortactin directly interacts with a clutch molecule, shootin1, in axonal growth cones, thereby mediating the linkage between F-actin retrograde flow and cell adhesions through L1-CAM. Shootin1–cortactin interaction was enhanced by shootin1 phosphorylation by Pak1, which is activated by the axonal chemoattractant netrin-1. We provide evidence that shootin1–cortactin interaction participates in netrin-1–induced F-actin adhesion coupling and in the promotion of traction forces for axon outgrowth. Under cell signaling, this regulatory F-actin adhesion coupling in growth cones cooperates with actin polymerization for efficient cellular motility.

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