Thermochimica Acta最新文献

Heat release behavior of aluminum particles under pure nitrogen atmosphere 纯氮气氛下铝颗粒的放热行为

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-26 DOI: 10.1016/j.tca.2025.180014

Xueqin Liao , Binghong Chen , Qiaoyu Zhang , Zehao Li , Jianzhong Liu

引用次数: 0

Synergistic flame retardant mechanism of MoO₃ and intumescent flame retardants: Insights from real-time char layer resistance monitoring MoO₃与膨胀型阻燃剂的协同阻燃机理：来自炭层电阻实时监测的见解

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-23 DOI: 10.1016/j.tca.2025.180013

Baichao Zang , Baoshu Chen , Xiping Gao , Dahu Yao , Jing Chen , Chang Lu

{"title":"Synergistic flame retardant mechanism of MoO₃ and intumescent flame retardants: Insights from real-time char layer resistance monitoring","authors":"Baichao Zang , Baoshu Chen , Xiping Gao , Dahu Yao , Jing Chen , Chang Lu","doi":"10.1016/j.tca.2025.180013","DOIUrl":"10.1016/j.tca.2025.180013","url":null,"abstract":"<div><div>This study explores the synergistic flame retardant mechanism of molybdenum trioxide (MoO₃) and intumescent flame retardants (IFRs) in a styrene-butadiene-styrene (SBS) matrix using real-time resistance monitoring. By tracking the char layer resistance during combustion and combining multiple characterization techniques, we examined MoO₃’s impact on the char layer morphology. The results demonstrate that the incorporation of MoO₃ enhances the flame-retardant performance of IFR. At 1 wt % MoO₃, the UL-94 rating improves from non-classified to V-1. Thermogravime tric Analysis reveals that MoO₃ lowers the initial decomposition temperature of the material from 240 °C to 231 °C while increasing the char residue. X-ray Photoelectron Spectroscopy and Fourier transform infrared analyses confirm that MoO₃ acts as a catalyst, promoting ammonium polyphosphate decomposition and facilitating the formation of phosphate esters, which enhance the char layer's viscosity and compactness. While MoO₃ does not directly participate in char crosslinking, it accelerates char formation, improves expansion, and strengthens flame retardancy. Real-time resistance data further indicate that MoO₃ reduces char formation time and slows char layer cracking, thereby enhancing flame resistance. This study provides new insights into the MoO₃/IFR synergy and introduces a novel approach for monitoring char layer changes during combustion.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"749 ","pages":"Article 180013"},"PeriodicalIF":3.1,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887037","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

Modelling of heat conduction calorimeters. Case of a non-differential skin calorimeter 热传导量热计的建模。非差示皮肤量热计病例

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-21 DOI: 10.1016/j.tca.2025.180015

Pedro Jesús Rodríguez de Rivera , Miriam Rodríguez de Rivera , Fabiola Socorro , Manuel Rodríguez de Rivera

引用次数: 0

Solubility of CO2 in aqueous solution of MDEA promoted by K2CO3 Experimental investigation and thermodynamic modeling K2CO3促进CO2在MDEA水溶液中的溶解度的实验研究和热力学模型

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-17 DOI: 10.1016/j.tca.2025.179988

Mohammad Saleh Sedighi , Hassan Pahlavanzadeh , Mehdi Ardjmand , Mahdi Goharrokhi

{"title":"Solubility of CO2 in aqueous solution of MDEA promoted by K2CO3 Experimental investigation and thermodynamic modeling","authors":"Mohammad Saleh Sedighi , Hassan Pahlavanzadeh , Mehdi Ardjmand , Mahdi Goharrokhi","doi":"10.1016/j.tca.2025.179988","DOIUrl":"10.1016/j.tca.2025.179988","url":null,"abstract":"<div><div>The main objective of this study is to experimentally investigate the CO<sub>2</sub> solubility in an aqueous solution of N-methyldiethanolamine (MDEA) promoted by Potassium carbonate (K<sub>2</sub>CO<sub>3</sub>) at 303, 313, 323 Kelvin and atmospheric pressure, and to model the behavior of this system. Therefore, it comprises two main sections: experimental and modeling. The experimental section examines and compares the solubility of CO<sub>2</sub> into pure MDEA, pure K<sub>2</sub>CO<sub>3</sub>, and their mixtures. The results showed that mixed solutions (MDEA 10–30 % promoted by K<sub>2</sub>CO<sub>3</sub> 5–10 %) have higher CO<sub>2</sub> solubility compared to pure MDEA and K<sub>2</sub>CO<sub>3</sub> at most points. The experiments were carried out using an apparatus for determining gas solubility in liquid (introduced by Pahlavanzadeh et al., 2006, 2009). Based on the data obtained in the experimental section, modeling of the CO<sub>2</sub> solubility into MDEA promoted by K<sub>2</sub>CO<sub>3</sub> was performed. The CTS model (introduced by Medeiros et al., 2008, 2013) was used in this study after improvement in the electrolytic section. This model, called CTS<sup>DH</sup>, includes three parts: physical, association, and electrolyte. Using the adjustable parameters obtained in this work, the CTS<sup>DH</sup> EoS was able to provide relatively good CO<sub>2</sub> loading in a wide range of operating conditions. The average absolute deviation of model results compared to experimental data was determined to be 3.4 %.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"749 ","pages":"Article 179988"},"PeriodicalIF":3.1,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838215","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

Size-dependent phase transition dynamics in HMX crystals: Mechanistic insights from defect-mediated transformation HMX 晶体中与尺寸有关的相变动力学：缺陷介导转变的机理启示

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-17 DOI: 10.1016/j.tca.2025.180012

Xingang Meng , Zhiqiang Wang , Jianping Song , Yuting Tao , Haobin Zhang , Shiliang Huang , Jie Sun , Xiong Cao , Jinjiang Xu

引用次数: 0

Insights on the role of KFCT in phase transition and thermal decomposition mechanism of ammonium nitrate KFCT在硝酸铵相变及热分解机理中的作用

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-14 DOI: 10.1016/j.tca.2025.180005

Yuqing Zhou , Jun Nan Yang , Haoming He , Shi Yao Zhang , Ke Ren Deng , Shiyang Li , Ding Hu , Zhimin Wu , Liu Tan

{"title":"Insights on the role of KFCT in phase transition and thermal decomposition mechanism of ammonium nitrate","authors":"Yuqing Zhou , Jun Nan Yang , Haoming He , Shi Yao Zhang , Ke Ren Deng , Shiyang Li , Ding Hu , Zhimin Wu , Liu Tan","doi":"10.1016/j.tca.2025.180005","DOIUrl":"10.1016/j.tca.2025.180005","url":null,"abstract":"<div><div>AN-based products face challenges due to the phase transition at room temperature and structural instability. To better look into the thermal decomposition mechanism of AN, potassium ferrocyanide (KFCT) was selected as an additive to study its effect on the crystal form modulation and the thermal decomposition of AN. The results show that AN/KFCT co-crystal that does not undergo phase transition at room temperature was prepared. The thermal decomposition of AN/KFCT co-crystal is divided into three stages compared to that of pure AN. Thermal findings highlighted that Fe<sup>3+</sup>can reduce the thermal stability of AN. Co-crystallization enables Fe<sup>2+</sup> to be encapsulated in crystals and therefore not oxidized during evaporative crystallization. Fe<sup>2+</sup>can inhibit the auto-catalytic process of AN by consuming auto-catalytic factor (NO<sub>2</sub>). Furthermore, the TG-MS was used to study the thermal decomposition mechanism of AN/KFCT co-crystal. The thermal decomposition pathways of AN/KFCT co-crystal was clear constructed.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"749 ","pages":"Article 180005"},"PeriodicalIF":3.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835251","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

Study on the combustion performance and micro-reaction mechanism of aluminum nanoparticles modified by fluorinated graphene with different contents 不同含量氟化石墨烯改性纳米铝的燃烧性能及微反应机理研究

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-13 DOI: 10.1016/j.tca.2025.180002

Fanqin Xiong , Baozhong Zhu , Cong Jiang , Changqing Su , Jun Liu , Jiuyu Chen , Minggao Xu , Yunlan Sun

引用次数: 0

Thermal stability of ionic matrices for MALDI-MS. A comparative study in solid state with classical matrices MALDI-MS中离子基质的热稳定性。固态与经典矩阵的比较研究

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-13 DOI: 10.1016/j.tca.2025.180004

Tobías Schmidt De León , María L. Salum , Rosa Erra-Balsells

{"title":"Thermal stability of ionic matrices for MALDI-MS. A comparative study in solid state with classical matrices","authors":"Tobías Schmidt De León , María L. Salum , Rosa Erra-Balsells","doi":"10.1016/j.tca.2025.180004","DOIUrl":"10.1016/j.tca.2025.180004","url":null,"abstract":"<div><div>Matrix-Assisted Laser Desorption/Ionization (MALDI) relies on the rapid absorption of laser energy by the matrix initiating a succession of events occurring in a high-vacuum chamber, including energy redistribution, temperature increase, analyte and matrix desorption, and their ionization. This study investigates the thermal behavior of classical acidic MALDI matrices (<em>E-</em>sinapinic acid (ESA), <em>E-</em>ferulic acid (EFE), <em>E-p-</em>coumaric acid (ECUM), and <em>E</em>-α-cyano-4-hydroxycinnamic acid (ECHCA)), their <em>Z</em>-isomers (ZSA, ZFE, ZCUM), and their salts formed with organic amines called ionic matrices (IMs). Using TGA, DSC, and <sup>1</sup>H NMR spectroscopy, we observed that <em>ortho</em>/<em>para</em>-substituted <em>E</em>-cinnamic acids with electron-donating groups thermally decompose via decarboxylation to produce styrene derivatives. IMs exhibited lower melting and decomposition temperatures compared to the crystalline matrix, improving the desorption/ionization process. However, IMs demonstrated lower analyte signal stability under successive laser shots, likely due to increased thermal decomposition.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"749 ","pages":"Article 180004"},"PeriodicalIF":3.1,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843598","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

Microcalorimetric analysis of granular microencapsulated phase change material including the effects of thermal cycling 含热循环影响的颗粒微囊化相变材料的微热分析

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-12 DOI: 10.1016/j.tca.2025.180001

Łukasz Omen , Andrzej J. Panas , Robert Szczepaniak , Andrzej Dudziński

{"title":"Microcalorimetric analysis of granular microencapsulated phase change material including the effects of thermal cycling","authors":"Łukasz Omen , Andrzej J. Panas , Robert Szczepaniak , Andrzej Dudziński","doi":"10.1016/j.tca.2025.180001","DOIUrl":"10.1016/j.tca.2025.180001","url":null,"abstract":"<div><div>The subject of the article is the study of granular microcapsules filled with BASF Micronal DS5038 X phase change material (PCM) using thermal analysis methods: thermogravimetry (TG) and microcalorimetry (DSC). The core DSC measurements were performed over a temperature range covering −20 °C to 55 °C or 80 °C, i.e. the area of the two identified, separable ranges of phase change for the filling material. Varying rates of heating/cooling ranging from 1 K·min<sup>−1</sup> to 10 K·min<sup>−1</sup> were used. The results of the microcalorimetric measurements were supplemented with TG results, ranging from 25 °C to 550 °C. The characterisation of the studied granulate was also complemented by the results of microscopic and profilometric studies documenting the structure of the microcapsules. Based on the results, the enthalpy and temperature of the onset and end of the observed phase changes were determined, as well as representative temperature dependencies of the apparent specific heat were determined – for both heating and cooling processes. The behaviour of the pellets under cyclic forcing of temperature changes with different rates of change was also documented.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 180001"},"PeriodicalIF":3.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823542","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

Study on the effect of rice husk ash and nano silica on the early hydration kinetic characteristics of oil well cement 稻壳灰和纳米二氧化硅对油井水泥早期水化动力学特性影响的研究

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-10 DOI: 10.1016/j.tca.2025.179995

Tianle Liu , Hao Xu , Shaojun Zheng , Huaimeng Gu , Dayang Wen , Yonglin Shan , Guosheng Jiang , Tian Dai

{"title":"Study on the effect of rice husk ash and nano silica on the early hydration kinetic characteristics of oil well cement","authors":"Tianle Liu , Hao Xu , Shaojun Zheng , Huaimeng Gu , Dayang Wen , Yonglin Shan , Guosheng Jiang , Tian Dai","doi":"10.1016/j.tca.2025.179995","DOIUrl":"10.1016/j.tca.2025.179995","url":null,"abstract":"<div><div>To explore the feasibility of using rice husk ash (RHA) as a substitute for nano-silica (NS) in partially replacing oil well cement and establishing a green, low-carbon oil well cement system, this study explores the effects of RHA and NS on the early hydration kinetics of cement using isothermal calorimetry at 20, 30, and 50 °C. The hydration exothermic rate and cumulative heat release of oil well cement with varying RHA and NS dosages were analyzed by isothermal calorimetry. Based on the Krstulovic’-Dabic’ model, hydration kinetics were evaluated and validated through thermogravimetric analysis. Results showed that RHA accelerated the peak exothermic rate and increased its intensity by 11.09 % and 38.62 % at 20 °C and 30 °C, respectively, with temperature effects being more pronounced at 50 °C. Both RHA and NS shortened induction and acceleration periods, enhanced product nucleation and growth rates, and prolonged phase boundary reactions. As temperature rose, RHA's pozzolanic activity significantly boosted cement hydration. The kinetic model effectively described the early hydration characteristics, offering insights into RHA's role in cement hydration.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179995"},"PeriodicalIF":3.1,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829312","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