Chemical Physics Letters最新文献_第3页

AFM nanoindentation-based study of thickness effects on the pseudoelastic behavior of Ni-Mn-Ga thin films 基于原子力显微镜纳米压痕的厚度对Ni-Mn-Ga薄膜伪弹性行为影响的研究

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-20 DOI: 10.1016/j.cplett.2025.142171

Simón Roa , Martín Sirena , Pablo Domenichini , Gonzalo Abarzúa

{"title":"AFM nanoindentation-based study of thickness effects on the pseudoelastic behavior of Ni-Mn-Ga thin films","authors":"Simón Roa , Martín Sirena , Pablo Domenichini , Gonzalo Abarzúa","doi":"10.1016/j.cplett.2025.142171","DOIUrl":"10.1016/j.cplett.2025.142171","url":null,"abstract":"<div><div>In freestanding form or attached to the substrate, Ni-Mn-Ga Shape Memory Alloys (SMAs) thin films and their near-stoichiometric configurations have attracted interest in recent years for applications in next-generation MEMS technologies. Thin films' capacity to recover stress-induced strain energy and total strain are critical to assess their potential for applications in these technologies. However, these capacities have not been extensively explored in this kind of alloys, especially at the nanoscale. In this work, we report a study of these aspects at the nanoscale in near-stoichiometric Ni<sub>2</sub>MnGa thin films by Atomic Force Microscopy (AFM)-assisted nanoindentation technique. Films with thickness (<span><math><mi>t</mi></math></span>) of 100, 250 and 500 [nm] fabricated on MgO(001) monocrystalline substrates by DC magnetron sputtering were studied. Results show that films exhibit a high capacity to recover stress-induced strain energy (> 70 % of the total strain energy) for relatively high indentation depths (> 0.3<span><math><mi>t</mi></math></span>). Pseudoelasticity effects were observed under certain film size and indentation depths conditions, which was evidenced by the presence of practically no mechanical hysteresis (plastic strain) concerning maximum strains that are comparable to the films' thicknesses. This behavior was observed together with considerable strain energy dissipation, suggesting the emergence of the pseudoelastic response due to stress-induced martensitic transformation. Our results suggest that the pseudoelastic behavior is strongly dependent on the film thickness, which seems to involve a competition between substrate-induced hardening effects and bulk martensitic transformation.</div></div>","PeriodicalId":273,"journal":{"name":"Chemical Physics Letters","volume":"874 ","pages":"Article 142171"},"PeriodicalIF":2.8,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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A re-examination of the highly floppy melamine molecule and predictability of quasi-molecule theory 对高度松散的三聚氰胺分子和准分子理论的可预测性的重新检验

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-17 DOI: 10.1016/j.cplett.2025.142137

A.J.C. Varandas

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Effect of annealing on the microstructure and optical properties of tetragonal SnO2 nanocrystals 退火对四方SnO2纳米晶微观结构和光学性能的影响

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-17 DOI: 10.1016/j.cplett.2025.142165

Amarjyoti Kalita , Saurabh K. Sharma

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BiOBr quantum dots as low detection Ammonia sensors: Room temperature detection and adsorption mechanism analysis BiOBr量子点作为低检测氨传感器：室温检测及吸附机理分析

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-17 DOI: 10.1016/j.cplett.2025.142157

Xuekun Yang , Fangrong Qin , Fang Chen , Peng Huang , Weiliang Wang , Haiming Huang , Yuxi Guo , Shaolin Zhang

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Molecular dynamics study on the physical influence of water molecules on epoxy-amine curing 水分子对环氧胺固化物理影响的分子动力学研究

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-16 DOI: 10.1016/j.cplett.2025.142158

Jean-Baptiste Jouenne , Viwanou Hounkpati , Germain Clavier , Delphine Barbier , Laurent Cauret , Alexandre Vivet

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Investigation of structural, hydrogen storage mechanism, electronic and optical properties of B10N2H18-type hydrides for hydrogen storage b10n2h18型氢化物的结构、储氢机理、电子和光学性质研究

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-16 DOI: 10.1016/j.cplett.2025.142151

Yong Pan, Feihong Yang

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Interference effect between crystal momentum channels in high-order harmonic generation 高次谐波产生中晶体动量通道间的干涉效应

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-14 DOI: 10.1016/j.cplett.2025.142133

Cai-Ping Zhang, Bao-Xia Liu, Yu-Zhi Chen, Si-Hui Wang, Xiang-Yang Miao

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Photocatalytic CO2 reduction over carbon vacancies enriched g-C3N4 treated by NaClO NaClO处理富碳空位g-C3N4光催化CO2还原

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-14 DOI: 10.1016/j.cplett.2025.142153

Huajian Yang, Yuyang Gong, Penghui Yang, Junbo Zhong, Jianzhang Li

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On the chemical bond of ClO2: An ab initio study 二氧化氯的化学键：从头算研究

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-12 DOI: 10.1016/j.cplett.2025.142144

Apostolos Kalemos

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Process optimization, phase transition kinetics fitting, and correlation between structure, morphology, and hue of iron oxide red pigment produced without ammonia nitrogen

IF 2.8 3区化学

Chemical Physics Letters Pub Date : 2025-05-10 DOI: 10.1016/j.cplett.2025.142150

Jiawei Shi , Shuirong Gu , Yiyang Yao , Bo Xie , Zheming Ni , Shengjie Xia

{"title":"Process optimization, phase transition kinetics fitting, and correlation between structure, morphology, and hue of iron oxide red pigment produced without ammonia nitrogen","authors":"Jiawei Shi , Shuirong Gu , Yiyang Yao , Bo Xie , Zheming Ni , Shengjie Xia","doi":"10.1016/j.cplett.2025.142150","DOIUrl":"10.1016/j.cplett.2025.142150","url":null,"abstract":"<div><div>The core aspect of the ammonia-free iron oxide red production process is the meticulous regulation of the FeOOH to α-Fe<sub>2</sub>O<sub>3</sub> phase transition. The kinetic properties, structural evolution, and the correlation between morphology and hue of this link play a decisive role in the scale-up and optimization of the process. α-Fe<sub>2</sub>O<sub>3</sub> was prepared using FeSO<sub>4</sub>-7H<sub>2</sub>O and NaOH under ammonia-free conditions. The kinetics of crystalline transformation and the correlation between sample morphology and hue were thoroughly investigated by optimizing the preparation conditions, kinetic fitting, and structural characterization. A method for real-time determination of FeOOH and α-Fe₂O₃ during the conversion process has been established based on X-ray diffraction. Moreover, it has been demonstrated that the hue phases of α-Fe₂O₃ are closely related to their chemical compositions and morphologies. This has been achieved through the scanning electron microscope, spectrophotometric chromatography, and other techniques. Furthermore, variations in reaction rates can result in discrepancies between the structural, morphological, and hue parameters of iron oxide red pigments and the anticipated standards. By regulating pivotal parameters throughout the phase transition process, including the concentration of Fe<sup>2+</sup>, the dispersion's pH, and the reaction's duration, it is possible to guarantee that the morphology and hue parameters of iron oxide red align with the specific application requirements.</div></div>","PeriodicalId":273,"journal":{"name":"Chemical Physics Letters","volume":"872 ","pages":"Article 142150"},"PeriodicalIF":2.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0