Thermochimica Acta最新文献_第3页

Doping SrSnO3 perovskite with transition metals: Synthesis of double hydroxides, thermal decomposition, and pigment potential 用过渡金属掺杂 SrSnO3 包晶：双氢氧化物的合成、热分解和颜料潜力

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-09-12 DOI: 10.1016/j.tca.2024.179864

{"title":"Doping SrSnO3 perovskite with transition metals: Synthesis of double hydroxides, thermal decomposition, and pigment potential","authors":"","doi":"10.1016/j.tca.2024.179864","DOIUrl":"10.1016/j.tca.2024.179864","url":null,"abstract":"<div>The primary objective of this research is to explore the feasibility of synthesizing phase-pure perovskite SrSnO3 doped with transition metals and to evaluate the potential of these products as high-temperature inorganic pigments. The initial step in preparing perovskite powders with the general formula SrSn0.95M0.05O3-δ (M = Mn, Fe, Co, Ni) involved synthesizing SrSn0.95M0.05(OH)6 followed by its thermal decomposition. The thermal decomposition processes and the reaction pathway for perovskite formation were analyzed using thermal analysis and X-ray diffraction analysis. Single-phase products of beige SrSn0.95Fe0.05O3-δ and brown SrSn0.95Co0.05O3-δ were successfully obtained by calcining the precursors at 1,100 °C. In contrast, brown SrSn0.95Mn0.05O3-δ contained a phase impurity of SnO2 and doping with Ni ions resulted in a phase mixture of SrSnO3 and NiO. The pigment quality of the powders was assessed based on their color parameters, described using the CIE Lab system.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142232862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Thermal conductivity of epoxy/multilayered graphene composites prepared with different curing agents 使用不同固化剂制备的环氧树脂/多层石墨烯复合材料的导热性能

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-09-10 DOI: 10.1016/j.tca.2024.179866

引用次数: 0

Experimental investigation and thermodynamic modeling for isobaric heat capacity of ethanol at elevated temperatures and pressures 高温高压下乙醇等压热容的实验研究和热力学建模

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-09-10 DOI: 10.1016/j.tca.2024.179865

引用次数: 0

Thermotropic phase behavior, structure and supramolecular organization of N, O-diacyl-β-alaninols with matched N- and O-acyl chains (n = 9-18) 具有匹配 N-和 O-酰基链的 N，O-二乙酰基-β-丙氨醇的热致相行为、结构和超分子组织（n = 9-18）

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-08-23 DOI: 10.1016/j.tca.2024.179852

引用次数: 0

Phase change materials encapsulated in graphene hybrid aerogels with high thermal conductivity for efficient solar-thermal energy conversion and thermal management of solar PV panels 石墨烯混合气凝胶中封装的相变材料具有高导热性，可用于太阳能光伏板的高效光热转换和热管理

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-08-22 DOI: 10.1016/j.tca.2024.179853

{"title":"Phase change materials encapsulated in graphene hybrid aerogels with high thermal conductivity for efficient solar-thermal energy conversion and thermal management of solar PV panels","authors":"","doi":"10.1016/j.tca.2024.179853","DOIUrl":"10.1016/j.tca.2024.179853","url":null,"abstract":"<div>Phase change materials (PCMs) have a wide range of applications in latent heat storage and thermal management. However, their practical use is hindered by high leakage rates and low thermal conductivity. To address these issues, polyvinyl alcohol/carboxylated carbon nanotubes/graphene hybrid aerogels (PCG) were carbonized at high temperatures to obtain polyvinyl alcohol/carboxylated carbon nanotubes/graphene carbon aerogels (cPCG). Polyethylene glycol (PEG) was then encapsulated within cPCG to form cPCG@PEG shape-stabilized PCMs (SSPCMs). These cPCG@PEG SSPCMs demonstrated excellent thermal conductivity (0.843 W•m-1•K-1) and superior solar-thermal conversion performance (91.8%). Additionally, the latent heat of cPCG@PEG showed a minimal decrease even after 100 melt-crystallization cycles. An experimental setup was designed to regulate the temperature of solar photovoltaic (PV) panels using cPCG@PEG. The results indicated that cPCG@PEG effectively managed the temperature of solar PV panels under varying light conditions. This study presents a novel approach for enhancing the application of porous PCMs in solar energy utilization and thermal management of equipment.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142075681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Exploring the curing kinetics of Acrolein-Pentaerythritol resin: Impact of molecular weight and molecular weight distribution on cure behavior 探索丙烯醛-季戊四醇树脂的固化动力学：分子量和分子量分布对固化行为的影响

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-08-15 DOI: 10.1016/j.tca.2024.179851

引用次数: 0

Kinetic investigation of aschalcha heavy oil oxidation in the presence of cobalt biocatalysts during in-situ combustion 原位燃烧过程中钴生物催化剂存在下的阿斯哈尔查重油氧化动力学研究

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-08-14 DOI: 10.1016/j.tca.2024.179854

{"title":"Kinetic investigation of aschalcha heavy oil oxidation in the presence of cobalt biocatalysts during in-situ combustion","authors":"","doi":"10.1016/j.tca.2024.179854","DOIUrl":"10.1016/j.tca.2024.179854","url":null,"abstract":"<div>The catalytic effect of cobalt tall oil and cobalt sunflower oil catalysts on the oxidation kinetics of heavy crude oil was investigated in this study. Comprehensive kinetic analyses, employing differential scanning calorimetry, thermogravimetric analysis, and kinetic modeling techniques, revealed that the presence of these catalysts significantly influenced the oxidation behavior of heavy oil. The catalysts exhibited pronounced shifts in the DSC and TG curves towards lower temperatures, indicating facilitated initiation of oxidation reactions at lower onset temperatures. Quantitative kinetic parameters, including activation energies and frequency factors, were determined using the Friedman and Kissinger-Akahira-Sunose analyses. The cobalt tall oil catalyst demonstrated superior performance, effectively lowering the activation energy barrier and increasing oxidation rates, particularly at higher conversion degrees. Catalyst characterization techniques, including X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy, revealed the formation of highly crystalline cobalt oxide nanoparticles with optimal dispersion and size distribution, as well as the presence of favorable functional groups for surface interactions. The results elucidated the role of these catalysts in facilitating the oxidation process through the provision of active sites, altered reaction pathways, favorable steric environments, and efficient oxygen activation capabilities. These findings contribute to the development of efficient catalytic systems for heavy oil upgrading processes and offer insights for further optimization of catalyst properties to achieve desired oxidation kinetics behavior.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142075680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Revisiting high-energy X-ray diffraction and differential scanning calorimetry data of EN AW-6082 with mean field simulations 利用平均场模拟重新审视 EN AW-6082 的高能 X 射线衍射和差示扫描量热数据

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-08-08 DOI: 10.1016/j.tca.2024.179848

{"title":"Revisiting high-energy X-ray diffraction and differential scanning calorimetry data of EN AW-6082 with mean field simulations","authors":"","doi":"10.1016/j.tca.2024.179848","DOIUrl":"10.1016/j.tca.2024.179848","url":null,"abstract":"<div>The present work re-evaluates previously published in-situ high-energy x-ray diffraction (HEXRD) and differential scanning calorimetry (DSC) data on EN AW-6082, which were used to study the precipitation kinetics of stable β-Mg2Si. Here, we address hitherto unattended information in the diffraction patterns. The revised analysis considers metastable precipitates and thermodynamically stable Fe-containing phases in addition to stable β-Mg2Si investigated in the previous studies. Furthermore, we utilize mean-field simulations to convert the evolution of individual phases obtained from HEXRD data into an equivalent excess specific heat <math><msubsup><mi>c</mi><mrow><mi>p</mi></mrow><mtext>ex</mtext></msubsup></math> signal. This methodology allows us to partly separate cooling and heating DSC data into the contributions of individual phases and make a quantitative comparison between results from HEXRD and DSC. This significantly improves our current understanding of DSC data and demonstrates, for instance, the difference in complexity between interpreting cooling and heating experiments in aluminum alloys.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0040603124001874/pdfft?md5=810ec089b15f73dde5b90b92acdff42f&pid=1-s2.0-S0040603124001874-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Liquid and crystallized phases stability in the sub-system H3PO4H4P2O7: Experimental determination and modeling 子系统 H3PO4[sbnd]H4P2O7 中液相和结晶相的稳定性：实验测定和模型建立

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-08-06 DOI: 10.1016/j.tca.2024.179837

{"title":"Liquid and crystallized phases stability in the sub-system H3PO4H4P2O7: Experimental determination and modeling","authors":"","doi":"10.1016/j.tca.2024.179837","DOIUrl":"10.1016/j.tca.2024.179837","url":null,"abstract":"<div>The study of the system formed by ortho- and pyrophosphoric acid was resumed in order to understand the crystallization conditions of these two compounds and to highlight the existence of their possible polymorphism. To this end, the solid-liquid equilibria (SLE) of pyrophosphoric acid was studied in depth. Contradictions in literature data were resolved through systematic experimentation: solubility measurements, differential scanning calorimetry (DSC), and X-ray diffraction (XRD). Calorimetric measurements confirmed the existence of two crystalline forms of pyrophosphoric acid, and their stability domains were determined. Furthermore, thermodynamic modeling of the SLE has led to a consistent and refined representation of the observed phenomena. In particular, the transition temperature from low-temperature (form I) to high-temperature form (form II) of pyrophosphoric acid was determined at 298.4 K and the coordinates of the eutectic point common between H3PO4 and H4P2O7 (I) were precisely determined. Modeling also confirms the non-negligible quantity of triphosphoric acid in the liquid state throughout virtually the entire compositional range. Finally, X-ray powder diffraction data were used to determine the cell parameters and space group of pyrophosphoric acid using EXPO 2014 software.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141943275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

An innovative method for isothermal and non-isothermal predictions of complex reactions 用于复杂反应等温和非等温预测的创新方法

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2024-08-05 DOI: 10.1016/j.tca.2024.179839

引用次数: 0