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Cryoporometry for short T2 samples:A T1 filter method applied to battery electrode characterization 认领 引用
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作者 Marc Fleury Thibaud Chevalier +2 位作者 Benjamin Nicot Quentin Denoyelle Julien Bernard 《Magnetic Resonance Letters》 EI CAS 2025年第3期10-22,共13页
The pore size distribution is often an important parameter for transport processes in porous media.Cryoporometry experiments can provide such data in the meso and macropore size up to 1 mm providing the sample tempera... The pore size distribution is often an important parameter for transport processes in porous media.Cryoporometry experiments can provide such data in the meso and macropore size up to 1 mm providing the sample temperature is finely controlled.We use a Peltier based system inserted directly into the NMR probe to control the temperature within 0.05℃and impose temperature ramps down to 0.002℃/min,necessary to characterize the largest pore sizes.The pore size information in the macropore range cannot be obtained from gas adsorption techniques while mercury injection is questionable for the material considered here.For porous materials made of paramagnetic minerals such as lithium-iron phosphate(LiFePO4,LFP)or nickel-manganese-cobalt oxides(NMC)and saturated with octamethylcyclotetrasiloxane(OMCTS),the T2relaxation times are very short such as protons from the liquid and frozen phases cannot be separated.Hence the usual cryoporometry experiment cannot be performed.Instead,we propose to use the T1contrast to separate these phases.The method is studied in detail along with some temperature effects linked with the T1variation of the bulk frozen OMCTS.We show an example on two cathode materials part of industrial battery product. 展开更多
关键词 Low field NMR Cryoporometry Short T2relaxation times Liquidesolid separation Battery electrode Pore size distribution
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Prediction and understanding of barocaloric effects in orientationally disordered materials from molecular dynamics simulations 认领 引用 被引量：1
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作者 Carlos Escorihuela-Sayalero Luis Carlos Pardo +5 位作者 Michela Romanini Nicolas Obrecht Sophie Loehlé Pol Lloveras Josep-Lluís Tamarit Claudio Cazorla 《npj Computational Materials》 SCIE EI CSCD 2024年第1期3113-3122,共10页
Due to its high energy efficiency and environmental friendliness,solid-state cooling based on the barocaloric(BC)effect represents a promising alternative to traditional refrigeration technologies relying on greenhous... Due to its high energy efficiency and environmental friendliness,solid-state cooling based on the barocaloric(BC)effect represents a promising alternative to traditional refrigeration technologies relying on greenhouse gases.Plastic crystals displaying orientational order-disorder solid-solid phase transitions have emerged among the most gifted materials on which to realize the full potential of BC solid-state cooling.However,a comprehensive understanding of the atomistic mechanisms on which order-disorder BC effects are sustained is still missing,and rigorous and systematic methods for quantitatively evaluating and anticipating them have not been yet established. 展开更多
关键词 solid sustained rigorous
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