Thermochimica Acta最新文献_第3页

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}

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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

The influence of temperature and humidity on the decomposition of HMX-HTPB polymer-bonded explosives 温度和湿度对HMX-HTPB聚合物粘结炸药分解的影响

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-09 DOI: 10.1016/j.tca.2025.180003

Haoying Liu , Li Hong , Yanchun Li , Aifeng Jiang , Dongming Song

引用次数: 0

Effects of amorphous structure on the catalytic properties of NiO in the thermal decomposition of typical energy-containing materials 非晶结构对NiO在典型含能材料热分解中催化性能的影响

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-07 DOI: 10.1016/j.tca.2025.179996

SiHeng Li, YiFan Jiang, FengQi Zhao, Na Li, Ding Liu, YingNan Dong, WenGang Qu

引用次数: 0

Kinetics and heating rates effects on coal devolatilization during pyrolysis 热解过程中煤脱挥发的动力学和升温速率影响

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-05 DOI: 10.1016/j.tca.2025.179999

Umar Abdullahi Isah , Muhammad Imran Rashid , Silas Kiman , Ibrahim Maina Idriss , Habu Mohammed Iyodo

引用次数: 0

Functionalized phenoxy-imine catalyst for synthesizing highly crystalline nascent UHMWPEs: Isothermal crystallization kinetics of less-entangled systems 合成高结晶新生超高分子量聚乙烯的功能化苯氧基亚胺催化剂：低纠缠体系的等温结晶动力学

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-05 DOI: 10.1016/j.tca.2025.180000

Sheng-Li Wu , Yi Wang

引用次数: 0

Hydrogen-bond density controlled sub-Tg annealing peaks in fast-scanning-chip calorimeter heating scans of non-crystallized aliphatic polyamides 快速扫描芯片量热计加热扫描非结晶脂肪族聚酰胺时氢键密度控制的亚tg退火峰

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-04-04 DOI: 10.1016/j.tca.2025.179997

René Androsch , Christoph Schick

{"title":"Hydrogen-bond density controlled sub-Tg annealing peaks in fast-scanning-chip calorimeter heating scans of non-crystallized aliphatic polyamides","authors":"René Androsch , Christoph Schick","doi":"10.1016/j.tca.2025.179997","DOIUrl":"10.1016/j.tca.2025.179997","url":null,"abstract":"<div><div>A series of aliphatic polyamides (PAs) including PA 6, PA 6.6, PA 6.10, PA 6.12, PA 11, and PA 12 has been subjected to physical aging and analyzed regarding changes of structure during annealing at temperatures around 50 to 100 K below the glass transition temperature (<span><math><msub><mi>T</mi><mi>g</mi></msub></math></span>) for periods up to few hours, employing fast scanning chip calorimetry (FSC). Annealing the amorphous glass of non-crystallized samples at such low temperatures produces endothermic sub-<span><math><msub><mi>T</mi><mi>g</mi></msub></math></span> annealing peaks at slightly higher temperature in subsequently recorded FSC heating scans, scaling in area with the time of annealing for a given annealing temperature. Variation of the annealing temperature furthermore indicates that the underlying process of structure-change slows down with decreasing annealing temperature but not disappears even 100 K below <span><math><mrow><mspace></mspace><msub><mi>T</mi><mi>g</mi></msub></mrow></math></span>. Most important, comparison of the behavior of the various PAs investigated reveals a distinct effect of the chemical structure such that the amount of structure-reorganization (glass relaxation and/or ordering) in a pre-defined period of time reduces with decreasing methylene-group sequence-length between amide groups. It appears that the amide-group concentration in the chains, which determines the density of the hydrogen-bond network to neighbored molecular segments, controls/restricts the re-arrangements of sub-nm sized molecular units.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179997"},"PeriodicalIF":3.1,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820396","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