Battery cells generate significant electronic waste, with zinc–carbon batteries discarded due to limited reuse and slow degradation from toxic components such as mercury, zinc, and ammonia. Recovering graphite from these spent cells provides a sustainable route to reduce environmental hazards while creating value-added materials for energy storage. This study examines organic PCMs enhanced with 1–3 wt% carbon recovered from waste batteries. XRD, FTIR, TEM, FESEM, BET, TGA, DSC analyses confirmed physical compatibility and clear phase coexistence, with smoother composite surfaces after carbon incorporation. Thermal conductivity increased to 0.86 W/mK, four times higher than pure paraffin, while latent heat showed only minor changes. After 500 cycles, XRD remained stable, though latent heat decreased by 23–32%. Heat-sink testing showed up to a 1.7-fold increase in operating time and a minimum thermal resistance of 1.222 °C/W at 3 wt%. The composites demonstrate strong potential for electronic cooling and solar-energy applications.
{"title":"Sustainable waste-to-energy strategy: Characterization and performance evaluation of a novel carbon/paraffin PCM for efficient thermal energy storage","authors":"Mridupavan Gogoi, Biplab Das, Promod Kumar Patowari","doi":"10.1016/j.tca.2025.180210","DOIUrl":"10.1016/j.tca.2025.180210","url":null,"abstract":"<div><div>Battery cells generate significant electronic waste, with zinc–carbon batteries discarded due to limited reuse and slow degradation from toxic components such as mercury, zinc, and ammonia. Recovering graphite from these spent cells provides a sustainable route to reduce environmental hazards while creating value-added materials for energy storage. This study examines organic PCMs enhanced with 1–3 wt% carbon recovered from waste batteries. XRD, FTIR, TEM, FESEM, BET, TGA, DSC analyses confirmed physical compatibility and clear phase coexistence, with smoother composite surfaces after carbon incorporation. Thermal conductivity increased to 0.86 W/mK, four times higher than pure paraffin, while latent heat showed only minor changes. After 500 cycles, XRD remained stable, though latent heat decreased by 23–32%. Heat-sink testing showed up to a 1.7-fold increase in operating time and a minimum thermal resistance of 1.222 °C/W at 3 wt%. The composites demonstrate strong potential for electronic cooling and solar-energy applications.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180210"},"PeriodicalIF":3.5,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926654","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}
Pub Date : 2025-12-29DOI: 10.1016/j.tca.2025.180208
Hao Yao , Yuandong Xiong , Aki Koskela , Timo Fabritius , Mamdouh Omran
Five different Finnish biomass sources were subjected to thermal degradation analyses and Fourier Transform Infrared Analysis to understand their pyrolytic behavior for bioenergy production. The pyrolysis experiments were carried out using a pure nitrogen atmosphere at three different heating rates (10, 15, 20 K min−1). In the pyrolysis process, the primary volatiles released were CO₂, CO, CH₄, H2O, and CH₃OH, along with their release patterns. Grass (GR) exhibited high thermal stability and lower activation energies (43.245–297.865 kJ/mol). Bark (BK) had an extended passive stage with moderate activation energies (66.947–319.685 kJ/mol) and is suitable for producing biochar. Sawdust (SD) exhibited distinct three-stage endothermic peaks with higher activation energies (69.343–335.280 kJ/mol) and is ideal for maximizing oil and gas yields. Straw (ST) demonstrated delayed pyrolysis compared to SD (71.961–287.998 kJ/mol). Fiber reject (FJ) had a single prominent peak with the lowest activation energies (33.156–286.429 kJ/mol), which makes it ideal for rapid pyrolysis at lower temperatures.
{"title":"Pyrolysis behaviour of different biomass by-products generated in Finland: Kinetics study and FTIR-DSC, TG-MS characterisation","authors":"Hao Yao , Yuandong Xiong , Aki Koskela , Timo Fabritius , Mamdouh Omran","doi":"10.1016/j.tca.2025.180208","DOIUrl":"10.1016/j.tca.2025.180208","url":null,"abstract":"<div><div>Five different Finnish biomass sources were subjected to thermal degradation analyses and Fourier Transform Infrared Analysis to understand their pyrolytic behavior for bioenergy production. The pyrolysis experiments were carried out using a pure nitrogen atmosphere at three different heating rates (10, 15, 20 K min<sup>−1</sup>). In the pyrolysis process, the primary volatiles released were CO₂, CO, CH₄, H<sub>2</sub>O, and CH₃OH, along with their release patterns. Grass (GR) exhibited high thermal stability and lower activation energies (43.245–297.865 kJ/mol). Bark (BK) had an extended passive stage with moderate activation energies (66.947–319.685 kJ/mol) and is suitable for producing biochar. Sawdust (SD) exhibited distinct three-stage endothermic peaks with higher activation energies (69.343–335.280 kJ/mol) and is ideal for maximizing oil and gas yields. Straw (ST) demonstrated delayed pyrolysis compared to SD (71.961–287.998 kJ/mol). Fiber reject (FJ) had a single prominent peak with the lowest activation energies (33.156–286.429 kJ/mol), which makes it ideal for rapid pyrolysis at lower temperatures.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180208"},"PeriodicalIF":3.5,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926653","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}
Pub Date : 2025-12-26DOI: 10.1016/j.tca.2025.180209
Yoshitomo Furushima , E․Billur Sevinis Ozbulut , Masaru Nakada , Rui Zhang , Katalee Jariyavidyanont , Mengxue Du , René Androsch , Christoph Schick , Akihiko Toda
A Thermal Gibbs-Thomson analysis for non-isothermal conditions is proposed to determine the equilibrium melting temperature of polymers based solely on thermal data which obtained during non-isothermal crystallization. This method extends the Thermal Gibbs-Thomson approach by utilizing the high-speed temperature control of Fast Scanning Calorimetry (FSC), allowing correction for thermal effects specific to non-isothermal conditions, such as melting followed by recrystallization and superheating. Melting and recrystallization are minimized through rapid heating, while superheating is addressed by analyzing the heating-rate dependence of the melting kinetics to extract the zero-entropy production melting temperature. The equilibrium melting temperature obtained through the Gibbs-Thomson analysis under non-isothermal conditions was found to be equivalent to the literature value calculated under isothermal conditions (as reported in the ATHAS database). Furthermore, we also conducted a Hoffman-Weeks analysis under non-isothermal conditions and successfully obtained an equilibrium melting temperature consistent with the literature values. These two non-isothermal approaches provide a practical and effective route for investigating the crystallization behavior of polymers under realistic processing conditions.
{"title":"Thermal Gibbs–Thomson and Hoffman-Weeks analysis for non-isothermal condition of polyethylene glycol","authors":"Yoshitomo Furushima , E․Billur Sevinis Ozbulut , Masaru Nakada , Rui Zhang , Katalee Jariyavidyanont , Mengxue Du , René Androsch , Christoph Schick , Akihiko Toda","doi":"10.1016/j.tca.2025.180209","DOIUrl":"10.1016/j.tca.2025.180209","url":null,"abstract":"<div><div>A Thermal Gibbs-Thomson analysis for non-isothermal conditions is proposed to determine the equilibrium melting temperature of polymers based solely on thermal data which obtained during non-isothermal crystallization. This method extends the Thermal Gibbs-Thomson approach by utilizing the high-speed temperature control of Fast Scanning Calorimetry (FSC), allowing correction for thermal effects specific to non-isothermal conditions, such as melting followed by recrystallization and superheating. Melting and recrystallization are minimized through rapid heating, while superheating is addressed by analyzing the heating-rate dependence of the melting kinetics to extract the zero-entropy production melting temperature. The equilibrium melting temperature obtained through the Gibbs-Thomson analysis under non-isothermal conditions was found to be equivalent to the literature value calculated under isothermal conditions (as reported in the ATHAS database). Furthermore, we also conducted a Hoffman-Weeks analysis under non-isothermal conditions and successfully obtained an equilibrium melting temperature consistent with the literature values. These two non-isothermal approaches provide a practical and effective route for investigating the crystallization behavior of polymers under realistic processing conditions.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180209"},"PeriodicalIF":3.5,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926788","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}
Pub Date : 2025-12-26DOI: 10.1016/j.tca.2025.180207
Zexin He, Yubo Tan, Yubin Zhuang, Wei Liu, Zhichun Liu
The development of sustainable and high-performance phase change materials (PCMs) is essential for efficient thermal energy storage and management. In this work, pine wood and balsa wood were used as biomass precursors to fabricate porous carbon matrices through delignification, chemical activation, and carbonization. Polyvinyl alcohol (PVA) was introduced to reinforce the carbon framework and improve structural stability, while polyethylene glycol (PEG-4000) served as the phase change medium. The resulting shape-stabilized composite PCMs were systematically characterized using SEM, BET, FTIR, XRD, DSC, TGA, and thermal conductivity measurements
The SEM and BET analyses revealed that activation and carbonization significantly enhanced pore connectivity and surface area, providing efficient pathways for PEG impregnation. FTIR spectra confirmed physical encapsulation and hydrogen bonding interactions between PEG and the carbon matrix. DSC results demonstrated that the composites exhibited high latent heat values (up to 138.23 kJ·kg⁻¹) and stable melting–solidification behavior, with minimal influence from PVA content. Balsa-derived composites showed higher enthalpy and thermal conductivity (0.55 W·m⁻¹·K⁻¹) than pine-derived counterparts due to their more ordered porous structures. TGA results indicated improved thermal stability, with decomposition temperatures increasing from 194 °C for pure PEG to above 300 °C for the composites.
Overall, the incorporation of biomass-derived porous carbon effectively suppressed leakage, enhanced thermal conductivity, and maintained high latent heat storage, demonstrating strong potential for eco-friendly and durable thermal energy storage applications.
{"title":"Preparation and characterization of porous carbon-based composite phase change materials based on wood biomass","authors":"Zexin He, Yubo Tan, Yubin Zhuang, Wei Liu, Zhichun Liu","doi":"10.1016/j.tca.2025.180207","DOIUrl":"10.1016/j.tca.2025.180207","url":null,"abstract":"<div><div>The development of sustainable and high-performance phase change materials (PCMs) is essential for efficient thermal energy storage and management. In this work, pine wood and balsa wood were used as biomass precursors to fabricate porous carbon matrices through delignification, chemical activation, and carbonization. Polyvinyl alcohol (PVA) was introduced to reinforce the carbon framework and improve structural stability, while polyethylene glycol (PEG-4000) served as the phase change medium. The resulting shape-stabilized composite PCMs were systematically characterized using SEM, BET, FTIR, XRD, DSC, TGA, and thermal conductivity measurements</div><div>The SEM and BET analyses revealed that activation and carbonization significantly enhanced pore connectivity and surface area, providing efficient pathways for PEG impregnation. FTIR spectra confirmed physical encapsulation and hydrogen bonding interactions between PEG and the carbon matrix. DSC results demonstrated that the composites exhibited high latent heat values (up to 138.23 kJ·kg⁻¹) and stable melting–solidification behavior, with minimal influence from PVA content. Balsa-derived composites showed higher enthalpy and thermal conductivity (0.55 W·m⁻¹·K⁻¹) than pine-derived counterparts due to their more ordered porous structures. TGA results indicated improved thermal stability, with decomposition temperatures increasing from 194 °C for pure PEG to above 300 °C for the composites.</div><div>Overall, the incorporation of biomass-derived porous carbon effectively suppressed leakage, enhanced thermal conductivity, and maintained high latent heat storage, demonstrating strong potential for eco-friendly and durable thermal energy storage applications.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180207"},"PeriodicalIF":3.5,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926785","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}
Pub Date : 2025-12-23DOI: 10.1016/j.tca.2025.180206
Juan F.G. Alba , Luciana L. Melo , Hyago M. Cavalcanti , Jose G.A. Pacheco , Roger Fréty , Rosangela R.L. Vidal
Luffa cylindrica fiber is widely used as an adsorbent for contaminants in water, but after use, it becomes chemical waste. This study investigates the thermal degradation of Luffa biomass after its modification with potential pollutants. The fiber was pretreated with saline water or diesel oil to simulate contamination and was compared to a reference fiber washed with deionized water. After drying, the samples were characterized using SEM/EDS microscopy. Subsequently, they underwent slow pyrolysis through thermogravimetric analysis and rapid micro-pyrolysis at 873 K. Thermogravimetric results under nitrogen indicate that these pretreatments affect the samples’ decomposition profiles. The presence of inorganic salts caused a slight catalytic effect during the decomposition of hemicellulose and cellulose under nitrogen, reducing the maximum peak decomposition temperature of hemicellulose by 38 K. Inorganic salts also exhibited inhibitory effects during the high-temperature combustion of biochar formed. In diesel-contaminated biomass, diesel can be practically removed without transformation before the Luffa fiber components begin to decompose at higher temperatures. The possibility of recovering an important fraction of diesel oil was also demonstrated in the micro-pyrolysis results. This study confirms that different pretreatments significantly affect Luffa decomposition mechanisms, suggesting that, in studies of biomass transformation, researchers must consider that initial cleaning processes can generate sample modifications. This method is also helpful for assessing the reuse of spent Luffa biomass for bioenergy generation.
{"title":"Thermal degradation of Luffa cylindrica Fiber modified by distilled water, saline water and diesel oil","authors":"Juan F.G. Alba , Luciana L. Melo , Hyago M. Cavalcanti , Jose G.A. Pacheco , Roger Fréty , Rosangela R.L. Vidal","doi":"10.1016/j.tca.2025.180206","DOIUrl":"10.1016/j.tca.2025.180206","url":null,"abstract":"<div><div><em>Luffa cylindrica</em> fiber is widely used as an adsorbent for contaminants in water, but after use, it becomes chemical waste. This study investigates the thermal degradation of <em>Luffa</em> biomass after its modification with potential pollutants. The fiber was pretreated with saline water or diesel oil to simulate contamination and was compared to a reference fiber washed with deionized water. After drying, the samples were characterized using SEM/EDS microscopy. Subsequently, they underwent slow pyrolysis through thermogravimetric analysis and rapid micro-pyrolysis at 873 K. Thermogravimetric results under nitrogen indicate that these pretreatments affect the samples’ decomposition profiles. The presence of inorganic salts caused a slight catalytic effect during the decomposition of hemicellulose and cellulose under nitrogen, reducing the maximum peak decomposition temperature of hemicellulose by 38 K. Inorganic salts also exhibited inhibitory effects during the high-temperature combustion of biochar formed. In diesel-contaminated biomass, diesel can be practically removed without transformation before the <em>Luffa</em> fiber components begin to decompose at higher temperatures. The possibility of recovering an important fraction of diesel oil was also demonstrated in the micro-pyrolysis results. This study confirms that different pretreatments significantly affect <em>Luffa</em> decomposition mechanisms, suggesting that, in studies of biomass transformation, researchers must consider that initial cleaning processes can generate sample modifications. This method is also helpful for assessing the reuse of spent <em>Luffa</em> biomass for bioenergy generation.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180206"},"PeriodicalIF":3.5,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926786","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}
Pub Date : 2025-12-22DOI: 10.1016/j.tca.2025.180205
Xiangyu Tong , Xiaowen Chen , Ning Chen , Bin Zhang , Xiaohu Wu
Gold nanoparticles based on localized surface plasmon resonance (LSPR) have been widely used in solar energy applications due to their excellent photothermal conversion properties. However, conventional nanostructures exhibit single-peak spectral responses and limited photothermal conversion efficiency, necessitating structural innovations to overcome the inherent limitations. Therefore, we have designed a novel class of framework-confined Au based nanocomposite structures. Compared with their mono-dispersions (cubic frame, nanosphere, and nanocylinder), the photothermal responses of framework-confined nanoparticles in the wavelength range of 300–1100 nm are significantly improved. In particular, the photothermal conversion efficiency of framework-confined nanocylinders is as high as 92.2 %. Electromagnetic field analysis shows that a framework with a tip structure coupled to an internal monomer achieves a multimodal surface plasmon resonance, leading to significant absorption. This work provides valuable insights into the design of nanoparticles with different conversion.
{"title":"Optimization of photothermal performance in framework-confined gold-based nanocomposite structures","authors":"Xiangyu Tong , Xiaowen Chen , Ning Chen , Bin Zhang , Xiaohu Wu","doi":"10.1016/j.tca.2025.180205","DOIUrl":"10.1016/j.tca.2025.180205","url":null,"abstract":"<div><div>Gold nanoparticles based on localized surface plasmon resonance (LSPR) have been widely used in solar energy applications due to their excellent photothermal conversion properties. However, conventional nanostructures exhibit single-peak spectral responses and limited photothermal conversion efficiency, necessitating structural innovations to overcome the inherent limitations. Therefore, we have designed a novel class of framework-confined Au based nanocomposite structures. Compared with their mono-dispersions (cubic frame, nanosphere, and nanocylinder), the photothermal responses of framework-confined nanoparticles in the wavelength range of 300–1100 nm are significantly improved. In particular, the photothermal conversion efficiency of framework-confined nanocylinders is as high as 92.2 %. Electromagnetic field analysis shows that a framework with a tip structure coupled to an internal monomer achieves a multimodal surface plasmon resonance, leading to significant absorption. This work provides valuable insights into the design of nanoparticles with different conversion.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180205"},"PeriodicalIF":3.5,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841242","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}
Pub Date : 2025-12-22DOI: 10.1016/j.tca.2025.180204
Chen Ding , Hongbing Zhang , Peizhao Liu , Wenbin Ding , Min Xu , Bin Meng
Osteoporotic fracture healing is orchestrated by the dynamic interplay between osteoblasts and osteoclasts, with microRNAs (miRNAs) serving as pivotal regulators of bone metabolism. This study aimed to elucidate the role of miR-34a-5p in osteoporotic fracture repair and its underlying molecular mechanisms. In vitro investigations demonstrated that miR-34a-5p suppresses osteoclast differentiation by directly targeting Foxp1, while concurrently mitigating Foxp1-mediated inhibition of osteoblast differentiation. Transcriptomic profiling of MC3T3-E1 osteoblasts, revealed that miR-34a-5p modulates osteoblast differentiation predominantly via the Hippo/YAP signaling axis, a finding further corroborated by Western blot, underscoring its central role in osteogenic regulation. In an ovariectomized (OVX) mouse femoral fracture model, local administration of miR-34a-5p mimics at the fracture site markedly accelerated bone repair. Micro-CT assessment demonstrated significant enhancement in bone volume and trabecular microarchitecture, while histological evaluations confirmed the expedited progression of bone regeneration. Collectively, these findings establish that miR-34a-5p orchestrates osteoblast and osteoclast activity through Foxp1 targeting and directly promotes osteoblast differentiation via the Hippo/YAP pathway, providing mechanistic insights and identifying potential therapeutic targets for miRNA-based strategies in bone repair.
{"title":"miR-34a-5p accelerates osteoporotic fracture healing by suppressing Foxp1 and modulating hippo/YAP-mediated bone remodeling","authors":"Chen Ding , Hongbing Zhang , Peizhao Liu , Wenbin Ding , Min Xu , Bin Meng","doi":"10.1016/j.tca.2025.180204","DOIUrl":"10.1016/j.tca.2025.180204","url":null,"abstract":"<div><div>Osteoporotic fracture healing is orchestrated by the dynamic interplay between osteoblasts and osteoclasts, with microRNAs (miRNAs) serving as pivotal regulators of bone metabolism. This study aimed to elucidate the role of miR-34a-5p in osteoporotic fracture repair and its underlying molecular mechanisms. In vitro investigations demonstrated that miR-34a-5p suppresses osteoclast differentiation by directly targeting Foxp1, while concurrently mitigating Foxp1-mediated inhibition of osteoblast differentiation. Transcriptomic profiling of MC3T3-E1 osteoblasts, revealed that miR-34a-5p modulates osteoblast differentiation predominantly via the Hippo/YAP signaling axis, a finding further corroborated by Western blot, underscoring its central role in osteogenic regulation. In an ovariectomized (OVX) mouse femoral fracture model, local administration of miR-34a-5p mimics at the fracture site markedly accelerated bone repair. Micro-CT assessment demonstrated significant enhancement in bone volume and trabecular microarchitecture, while histological evaluations confirmed the expedited progression of bone regeneration. Collectively, these findings establish that miR-34a-5p orchestrates osteoblast and osteoclast activity through Foxp1 targeting and directly promotes osteoblast differentiation via the Hippo/YAP pathway, providing mechanistic insights and identifying potential therapeutic targets for miRNA-based strategies in bone repair.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180204"},"PeriodicalIF":3.5,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926787","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}
Pub Date : 2025-12-17DOI: 10.1016/j.tca.2025.180203
Junping Meng , Binbin Yao , Xiaoyan Li , Xile Li , Chi Jia
This research explores the incorporation of thermally activated tuff powder (ATP) into cementitious materials, with the aim of clarifying the mechanisms of microstructural reconstruction, improving pozzolanic reactivity, and establishing the link between tuff’s microstructural transformation and its pozzolanic behavior. The results indicate that the optimal thermal activation parameter for tuff is an activation temperature of 800 °C, under which the compressive strength of the cement-based material reaches 56.1 MPa, with an activity index of 106.3 %. The thermal activation process disrupts the crystalline phases in TF, promoting the dehydroxylation of silicate minerals and releasing highly reactive materials while significantly increasing the specific surface area, thereby providing more active sites for pozzolanic reactions. This study offers a theoretical basis and technical guidance for the efficient utilization of tuff resources and the development of high-performance supplementary cementitious materials (SCMs), thereby promoting the sustainable and performance-oriented advancement of cement-based materials.
{"title":"Thermal activated tuff as a supplementary cementitious material: microstructure and pozzolanic reactivity","authors":"Junping Meng , Binbin Yao , Xiaoyan Li , Xile Li , Chi Jia","doi":"10.1016/j.tca.2025.180203","DOIUrl":"10.1016/j.tca.2025.180203","url":null,"abstract":"<div><div>This research explores the incorporation of thermally activated tuff powder (ATP) into cementitious materials, with the aim of clarifying the mechanisms of microstructural reconstruction, improving pozzolanic reactivity, and establishing the link between tuff’s microstructural transformation and its pozzolanic behavior. The results indicate that the optimal thermal activation parameter for tuff is an activation temperature of 800 °C, under which the compressive strength of the cement-based material reaches 56.1 MPa, with an activity index of 106.3 %. The thermal activation process disrupts the crystalline phases in TF, promoting the dehydroxylation of silicate minerals and releasing highly reactive materials while significantly increasing the specific surface area, thereby providing more active sites for pozzolanic reactions. This study offers a theoretical basis and technical guidance for the efficient utilization of tuff resources and the development of high-performance supplementary cementitious materials (SCMs), thereby promoting the sustainable and performance-oriented advancement of cement-based materials.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180203"},"PeriodicalIF":3.5,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841246","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}
Pub Date : 2025-12-16DOI: 10.1016/j.tca.2025.180202
Yifan Wang , Wenzhe Zhang , Yubo Yin , Qingda Guo , Peizhi Yang , Huaqing Xie , Wei Yu
Traditional composite phase change materials suffer from issues such as leakage and insufficient flexibility, which significantly impair their performance in human skin temperature regulation and wearable thermal management applications. This study employs a sol-gel synergistic method to integrate n-octadecane, n-decanoic acid, and a three-dimensional styrene-ethylene-butylene-styrene (SEBS) elastic network. This method results in the development of a phase change gel that combines leak-proof properties with flexibility. The SEBS framework securely locks the eutectic material within microscale pores, allowing the energy storage gel to maintain its integrity at temperatures as high as 80 °C. The material exhibits excellent tensile and compressive strengths, with stress values as high as 1.108 MPa and 1.120 MPa, respectively. This ensures that the material can deform freely without breaking when applied to the skin. In practical applications on human skin, the temperature of the wrist without the gel reached 45 °C within 120 s and continued to rise. In contrast, the temperature in the wearing area increased significantly more slowly, maintaining approximately 32 °C at 220 s and showing a noticeable temperature increase only after 600 s. These results demonstrate the material's excellent temperature control and insulation performance. This research has promising applications in high-temperature environments and localized thermal buffering.
{"title":"High mechanical strength flexible phase change gel: enhanced thermal buffering materials for human skin temperature control","authors":"Yifan Wang , Wenzhe Zhang , Yubo Yin , Qingda Guo , Peizhi Yang , Huaqing Xie , Wei Yu","doi":"10.1016/j.tca.2025.180202","DOIUrl":"10.1016/j.tca.2025.180202","url":null,"abstract":"<div><div>Traditional composite phase change materials suffer from issues such as leakage and insufficient flexibility, which significantly impair their performance in human skin temperature regulation and wearable thermal management applications. This study employs a sol-gel synergistic method to integrate n-octadecane, n-decanoic acid, and a three-dimensional styrene-ethylene-butylene-styrene (SEBS) elastic network. This method results in the development of a phase change gel that combines leak-proof properties with flexibility. The SEBS framework securely locks the eutectic material within microscale pores, allowing the energy storage gel to maintain its integrity at temperatures as high as 80 °C. The material exhibits excellent tensile and compressive strengths, with stress values as high as 1.108 MPa and 1.120 MPa, respectively. This ensures that the material can deform freely without breaking when applied to the skin. In practical applications on human skin, the temperature of the wrist without the gel reached 45 °C within 120 s and continued to rise. In contrast, the temperature in the wearing area increased significantly more slowly, maintaining approximately 32 °C at 220 s and showing a noticeable temperature increase only after 600 s. These results demonstrate the material's excellent temperature control and insulation performance. This research has promising applications in high-temperature environments and localized thermal buffering.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180202"},"PeriodicalIF":3.5,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841241","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}
Understanding the mechanistic details of diesel particulate matter (DPM) oxidation is essential for optimising the regeneration process of diesel particulate filters (DPF). This study aimed to investigate the kinetics of DPM oxidation accelerated by Ag/Al₂O₃. Experiments were conducted using thermogravimetric analysis (TGA) at different heating rates. The activation energy was determined using the isoconversional method, the multi-step reaction was identified using the peak deconvolution technique, and the reaction models were selected using the master plot approach. The results revealed a multi-step transformation process with activation energies of 50–130 kJ/mol. The main role of Ag/Al₂O₃ was to supply active oxygen for light VOCs and to facilitate O₂ transport from the gas stream to the heavy VOCs sites. For the oxidation of solid carbons, the catalyst promoted the formation of active oxygen and improved the catalytic oxidation reaction mechanism. This kinetic study provides insights into the oxidation behaviour of DPM, contributing to the design of an efficient DPF.
{"title":"Advanced kinetic analysis of Ag/Al₂O₃-catalysed diesel particulate matter oxidation: multi-step modelling and peak deconvolution","authors":"Boonlue Sawatmongkhon , Aunyamanee Sawatdimongkon , Punya Promhuad , Thawatchai Wongchang , Ekarong Sukjit , Nathinee Theinnoi , Kampanart Theinnoi","doi":"10.1016/j.tca.2025.180201","DOIUrl":"10.1016/j.tca.2025.180201","url":null,"abstract":"<div><div>Understanding the mechanistic details of diesel particulate matter (DPM) oxidation is essential for optimising the regeneration process of diesel particulate filters (DPF). This study aimed to investigate the kinetics of DPM oxidation accelerated by Ag/Al₂O₃. Experiments were conducted using thermogravimetric analysis (TGA) at different heating rates. The activation energy was determined using the isoconversional method, the multi-step reaction was identified using the peak deconvolution technique, and the reaction models were selected using the master plot approach. The results revealed a multi-step transformation process with activation energies of 50–130 kJ/mol. The main role of Ag/Al₂O₃ was to supply active oxygen for light VOCs and to facilitate O₂ transport from the gas stream to the heavy VOCs sites. For the oxidation of solid carbons, the catalyst promoted the formation of active oxygen and improved the catalytic oxidation reaction mechanism. This kinetic study provides insights into the oxidation behaviour of DPM, contributing to the design of an efficient DPF.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180201"},"PeriodicalIF":3.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798938","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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