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}
Pub Date : 2025-12-10DOI: 10.1016/j.tca.2025.180200
A. Vidal-Crespo, A.F. Manchón-Gordón, J.J. Ipus, J.S. Blázquez
The temperature memory effect (TME) in MnCo0.97Fe0.03Ge shape memory alloy, fabricated as pellets via arc-melting, has been investigated once the martensite phase was stabilized at room temperature. The results revealed that TME appears during the reverse transformation of thermally induced martensite after incomplete transformation cycling, spanning the entire interval between the austenite start and finish temperatures. Although the reverse transformation temperature range can be broadened by kinetic interruption, restoring the sample to its relaxed state requires the completion of the transformation up to higher temperatures. This necessity must be considered for practical potential uses of these alloys as shape memory applications.
{"title":"Thermal memory effect in Mn(CoFe)Ge intermetallic compound","authors":"A. Vidal-Crespo, A.F. Manchón-Gordón, J.J. Ipus, J.S. Blázquez","doi":"10.1016/j.tca.2025.180200","DOIUrl":"10.1016/j.tca.2025.180200","url":null,"abstract":"<div><div>The temperature memory effect (TME) in MnCo<sub>0.97</sub>Fe<sub>0.03</sub>Ge shape memory alloy, fabricated as pellets via arc-melting, has been investigated once the martensite phase was stabilized at room temperature. The results revealed that TME appears during the reverse transformation of thermally induced martensite after incomplete transformation cycling, spanning the entire interval between the austenite start and finish temperatures. Although the reverse transformation temperature range can be broadened by kinetic interruption, restoring the sample to its relaxed state requires the completion of the transformation up to higher temperatures. This necessity must be considered for practical potential uses of these alloys as shape memory applications.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180200"},"PeriodicalIF":3.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798943","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 : 2025-12-05DOI: 10.1016/j.tca.2025.180199
Louis Desgrosseilliers , Nerea Uranga , Daniel Carbonell , Ignacio Gurruchaga
A concise power law reaction kinetic expression of reversible crystallization phase change was presented for use in global modelling of crystallization and nucleation kinetics of solid-liquid phase change materials (PCMs). This was developed as a closed form, wholly mechanistic expression of phase change kinetics essential to predict coupled heat-mass latent heat evolution in PCMs. This constituted a significant departure from the semi-empirical and phenomenological formulations that have so far dominated PCM sciences. Notably, the presented formulation expresses relative mass supersaturation as the fundamental driving force for phase change as opposed to relying on supercooling degree or temperature rate. In contrast to practice in the industrial crystallization process industry, it was postulated that crystal size population balances could be neglected in PCMs used for thermal storage due to averaging effects of crystal size population balances since the rates of latent heat evolution and heat transport are exclusively prioritized rather than yield of a desired crystal size.
A favourable formulation of the global power law crystallization kinetic model was obtained through evaluation against the 0D transient reference case derived from the cooling curve of manually seeded crystallization of 11 K supercooled 38.1 %mass NaCHO2 aqueous solution, yielding NaCHO2•3H2O(s), under development as a cold storage PCM. Values of apparent activation energies of nucleation and crystal growth and their respective pre-exponential rate constants were obtained by least-squares fitting of experimental cooling curve data. The power law kinetic model was also validated under isothermal conditions using the JMAK equation.
{"title":"Concise mechanistic model of phase change material solidification kinetics","authors":"Louis Desgrosseilliers , Nerea Uranga , Daniel Carbonell , Ignacio Gurruchaga","doi":"10.1016/j.tca.2025.180199","DOIUrl":"10.1016/j.tca.2025.180199","url":null,"abstract":"<div><div>A concise power law reaction kinetic expression of reversible crystallization phase change was presented for use in global modelling of crystallization and nucleation kinetics of solid-liquid phase change materials (PCMs). This was developed as a closed form, wholly mechanistic expression of phase change kinetics essential to predict coupled heat-mass latent heat evolution in PCMs. This constituted a significant departure from the semi-empirical and phenomenological formulations that have so far dominated PCM sciences. Notably, the presented formulation expresses relative mass supersaturation as the fundamental driving force for phase change as opposed to relying on supercooling degree or temperature rate. In contrast to practice in the industrial crystallization process industry, it was postulated that crystal size population balances could be neglected in PCMs used for thermal storage due to averaging effects of crystal size population balances since the rates of latent heat evolution and heat transport are exclusively prioritized rather than yield of a desired crystal size.</div><div>A favourable formulation of the global power law crystallization kinetic model was obtained through evaluation against the 0D transient reference case derived from the cooling curve of manually seeded crystallization of 11 K supercooled 38.1 %mass NaCHO<sub>2</sub> aqueous solution, yielding NaCHO<sub>2</sub>•3H<sub>2</sub>O(s), under development as a cold storage PCM. Values of apparent activation energies of nucleation and crystal growth and their respective pre-exponential rate constants were obtained by least-squares fitting of experimental cooling curve data. The power law kinetic model was also validated under isothermal conditions using the JMAK equation.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"756 ","pages":"Article 180199"},"PeriodicalIF":3.5,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739049","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 : 2025-12-02DOI: 10.1016/j.tca.2025.180198
Abdel Illah Nabil Korti, Djahida Mahmoudi
This study valorizes slack wax, a petroleum refining byproduct, as a sustainable additive for paraffin-based phase change materials (PCMs). The limited heat storage of paraffin and the high cost of nanoscale additives hinder their application. We characterize composites using a refined T-History methodology, augmented by H-history analysis and polynomial interpolation for enhanced accuracy. Incorporating 20 % slack wax increases latent heat by 21 % (190–230 kJ/kg) while maintaining melting point stability (±0.2 °C). The composite demonstrates a sharper phase transition and excellent cycling stability (<1 % degradation after 15 cycles). Cross-validation of the Y- and H-methods revealed a minimal deviation in latent heat of <2 %, confirming the robustness of our measurements. Although thermal conductivity decreases by 17 %, this is offset by a 90 % cost reduction compared to nano-enhanced PCMs. The waste valorization benefits and high energy density make this material ideal for applications prioritizing storage capacity over rapid discharge, such as solar thermal storage and passive building temperature control. This approach provides a sustainable and economically viable pathway for large-scale PCM production, successfully repurposing industrial waste to advance thermal energy storage.
{"title":"Valorization of petroleum slack wax for sustainable phase change materials with enhanced thermal energy storage","authors":"Abdel Illah Nabil Korti, Djahida Mahmoudi","doi":"10.1016/j.tca.2025.180198","DOIUrl":"10.1016/j.tca.2025.180198","url":null,"abstract":"<div><div>This study valorizes slack wax, a petroleum refining byproduct, as a sustainable additive for paraffin-based phase change materials (PCMs). The limited heat storage of paraffin and the high cost of nanoscale additives hinder their application. We characterize composites using a refined T-History methodology, augmented by H-history analysis and polynomial interpolation for enhanced accuracy. Incorporating 20 % slack wax increases latent heat by 21 % (190–230 kJ/kg) while maintaining melting point stability (±0.2 °C). The composite demonstrates a sharper phase transition and excellent cycling stability (<1 % degradation after 15 cycles). Cross-validation of the Y- and H-methods revealed a minimal deviation in latent heat of <2 %, confirming the robustness of our measurements. Although thermal conductivity decreases by 17 %, this is offset by a 90 % cost reduction compared to nano-enhanced PCMs. The waste valorization benefits and high energy density make this material ideal for applications prioritizing storage capacity over rapid discharge, such as solar thermal storage and passive building temperature control. This approach provides a sustainable and economically viable pathway for large-scale PCM production, successfully repurposing industrial waste to advance thermal energy storage.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"755 ","pages":"Article 180198"},"PeriodicalIF":3.5,"publicationDate":"2025-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737252","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}
With the growing challenge of electronic waste (e-waste), this study explores CO₂-assisted gasification as a valorization method for five typical e-waste resins: PSM, DFR, WPCB, SW, and F. Using TG-MS and TG-FTIR techniques, non-isothermal kinetic modeling was performed under a CO₂ atmosphere to determine activation energies and reaction mechanisms. The findings offer molecular-level insights into pollution control during e-waste gasification and establish a theoretical basis for process optimization guided by gasification kinetics, highlighting its engineering potential for sustainable waste treatment.
{"title":"Gasification mechanism and product analysis of resin wastes: an integrated study of TG-FTIR-MS and kinetic modeling","authors":"Liyan Chen , Qian Liu , Yinsheng Jiang , Wenqi Zhong , Wenli Dong","doi":"10.1016/j.tca.2025.180197","DOIUrl":"10.1016/j.tca.2025.180197","url":null,"abstract":"<div><div>With the growing challenge of electronic waste (e-waste), this study explores CO₂-assisted gasification as a valorization method for five typical e-waste resins: PSM, DFR, WPCB, SW, and F. Using TG-MS and TG-FTIR techniques, non-isothermal kinetic modeling was performed under a CO₂ atmosphere to determine activation energies and reaction mechanisms. The findings offer molecular-level insights into pollution control during e-waste gasification and establish a theoretical basis for process optimization guided by gasification kinetics, highlighting its engineering potential for sustainable waste treatment.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"755 ","pages":"Article 180197"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145681861","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 : 2025-11-30DOI: 10.1016/j.tca.2025.180196
Wei-Le Chen , Jun Deng , Yin Deng , Lan Yin , Cai-Ping Wang , Xia-Dan Duan , Hai-fei Lin
Mining flame-retardant conveyor belts (FRCBs) is a crucial bridge transporting coal in mine, but the occurrence of FRCB fires has seriously affected the safety transportation and mining of coal. To investigate their pyrolysis and combustion characteristics, FRCBs for polyvinyl chloride (PVC) and polyvinyl chloride gum elastic (PVG) were selected, and simultaneous thermal analysis-Fourier transform infrared spectroscopy was adopted to measure their pyrolysis and combustion characteristics, including mass loss characteristics, heat release properties, and gaseous products. Apparent activation energy was received by Kissinger-Akahira-Sunose method. The results indicated that, during combustion, FRCB for PVC and PVG experienced three and two weightlessness stages, respectively. and main functional groups of FRCB for PVC were HCl, chlorinated hydrocarbons, CO2, and aromatic compounds, while FRCB for PVG generated additional gaseous products for cyanate gas. Meanwhile, the average apparent activation energy of FRCBs for PVG was 144.3 kJ·mol-1 in the first stage of combustion, which was higher than that for PVC at 125.6 kJ·mol-1. During pyrolysis, the FRCBs for PVG and PVC experienced two weightlessness stages, the FRCBs for PVC generated the additional CH gas and ester compounds, and PVG also produced ester compounds without cyanate gas. Moreover, their heat releases during pyrolysis were lower than that during combustion. while FRCB for PVG generated additional gaseous products for cyanate gas. The average apparent activation energy of FRCBs for PVG was 162.0 kJ·mol-1 In the first stage of pyrolysis, which was higher than that for PVC at 143.3 kJ·mol-1. These findings confirmed that PVG had superior flame retardancy compared to PVC. The research results provide a theoretical basis for determining key criteria in early intelligent warning.
{"title":"Comparative analysis on thermal characteristics and microstructures of mining flame-retardant conveyor belts during pyrolysis and combustion","authors":"Wei-Le Chen , Jun Deng , Yin Deng , Lan Yin , Cai-Ping Wang , Xia-Dan Duan , Hai-fei Lin","doi":"10.1016/j.tca.2025.180196","DOIUrl":"10.1016/j.tca.2025.180196","url":null,"abstract":"<div><div>Mining flame-retardant conveyor belts (FRCBs) is a crucial bridge transporting coal in mine, but the occurrence of FRCB fires has seriously affected the safety transportation and mining of coal. To investigate their pyrolysis and combustion characteristics, FRCBs for polyvinyl chloride (PVC) and polyvinyl chloride gum elastic (PVG) were selected, and simultaneous thermal analysis-Fourier transform infrared spectroscopy was adopted to measure their pyrolysis and combustion characteristics, including mass loss characteristics, heat release properties, and gaseous products. Apparent activation energy was received by Kissinger-Akahira-Sunose method. The results indicated that, during combustion, FRCB for PVC and PVG experienced three and two weightlessness stages, respectively. and main functional groups of FRCB for PVC were HCl, chlorinated hydrocarbons, CO<sub>2</sub>, and aromatic compounds, while FRCB for PVG generated additional gaseous products for cyanate gas. Meanwhile, the average apparent activation energy of FRCBs for PVG was 144.3 kJ·mol<sup>-1</sup> in the first stage of combustion, which was higher than that for PVC at 125.6 kJ·mol<sup>-1</sup>. During pyrolysis, the FRCBs for PVG and PVC experienced two weightlessness stages, the FRCBs for PVC generated the additional C<img>H gas and ester compounds, and PVG also produced ester compounds without cyanate gas. Moreover, their heat releases during pyrolysis were lower than that during combustion. while FRCB for PVG generated additional gaseous products for cyanate gas. The average apparent activation energy of FRCBs for PVG was 162.0 kJ·mol<sup>-1</sup> In the first stage of pyrolysis, which was higher than that for PVC at 143.3 kJ·mol<sup>-1</sup>. These findings confirmed that PVG had superior flame retardancy compared to PVC. The research results provide a theoretical basis for determining key criteria in early intelligent warning.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"755 ","pages":"Article 180196"},"PeriodicalIF":3.5,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145681860","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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