International Journal of Thermophysics最新文献

{"title":"Research Progress of Interfacial Modification of Copper/Diamond Composites for Electronic Packaging","authors":"Zhihua Hu,&nbsp;Bowen Zhang,&nbsp;Hongmei Yu,&nbsp;Yan Lei,&nbsp;Haiyan Xiong,&nbsp;Binghua Jiang,&nbsp;Deping Chen","doi":"10.1007/s10765-025-03600-x","DOIUrl":"10.1007/s10765-025-03600-x","url":null,"abstract":"<div><p>Copper/diamond composites exhibit significant potential in various fields, including microelectronics, weaponry, power batteries and aerospace, owing to their adjustable transport properties, high thermal conductivity (TC), and customizable coefficients of thermal expansion. However, interface gaps and weak bonding have significantly impeded the application of copper/diamond composites with high thermal conductivity. This paper summarizes the preparation methods and research advancements in the interfacial modification of copper/diamond composites. Revealing that the introduction of carbide-forming elements (e.g., Zr, Cr, Ti) via matrix alloying or diamond surface metallization significantly improves solid–liquid wettability (reducing contact angles below 90°) and enhances interfacial bonding through chemical reaction or atomic diffusion. These insights are crucial for enhancing the interfacial bonding between copper and diamond, thereby improving the thermal conductivity of the composites.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micellization and Thermodynamic Behavior of Surface-Active Ionic Liquids Based on 2-Hydroxyethylammonium Stearate in the Presence of Gabapentin","authors":"Mohammad Bagheri Hokm Abad,&nbsp;Hemayat Shekaari,&nbsp;Masumeh Mokhtarpour,&nbsp;Behrang Golmohammadi","doi":"10.1007/s10765-025-03589-3","DOIUrl":"10.1007/s10765-025-03589-3","url":null,"abstract":"<div><p>Gabapentin, as an anticonvulsant is commonly prescribed off-label to treat neuropathic pain. Gabapentin is classified as a low-permeability drug in the gastrointestinal tract. To address this challenge, various optimization strategies have been explored. Surface-active ionic liquids (SAILs), combine surfactant and ionic liquid characteristics and offer potential as permeability enhancers. This study examines the interplay between gabapentin and ethanolamine-based SAILs in aqueous solutions to evaluate their potential for improving gabapentin’s drug-related properties. For this purpose, density, speed of sound, and electrical conductivity of gabapentin in water and aqueous (2-hydroxyethyl)ammonium Stearate, [2-HEA][St], bis(2-hydroxyethyl) ammonium stearate, [BHEA][St], and tris(2-hydroxyethyl) ammonium stearate, [THEA][St], were measured over a varied temperature range. The apparent molar volumes, <span>(V_{varphi })</span>, and apparent molar isentropic compressibility, <span>(kappa_{varphi })</span>, were calculated and fitted by the Masson equation. The structural organization facilitated by gabapentin in the presence of SAILs has been substantiated. This interaction promotes enhanced hydrophobic hydration and various intermolecular interactions, which collectively contribute to improved bulk compressibility properties. The findings indicate that [THEA][St] demonstrates the lowest critical micelle concentration (CMC) value [1.0203 (mol·m⁻³) for [THEA][St] in water and 0.5401 (mol·m⁻³) in 0.0500 mol·kg⁻¹ aqueous gabapentin solution] compared to the other studied SAILs. This suggests that the presence of [THEA][St] enhances the interaction with the gabapentin drug, making it the most favorable option for improving gabapentin drug-related properties. Analysis of the COSMO results indicates that as the molecular size increases, as shown by the expansion of surface area and volume, the solvation properties of the molecules generally improve.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sustainable Retrofit of a Historic Building Using Wall Insulation: Balancing Heritage Preservation and Energy Performance","authors":"Yujin Kang,&nbsp;Sumin Kim","doi":"10.1007/s10765-025-03602-9","DOIUrl":"10.1007/s10765-025-03602-9","url":null,"abstract":"<div><p>The preservation and energy-efficient renovation of historical buildings poses significant challenges owing to legal and structural constraints. In Korea, where historic façades are protected under national heritage regulations, internal insulation is one of the few viable retrofit options. Seven commercially available insulation materials—expanded polystyrene (EPS), extruded polystyrene (XPS), polyurethane (PU), phenolic foam (PF), glass wool (GW), mineral wool (MW), and vacuum insulated panel (VIP)—were evaluated based on measured thermal conductivity and applied to the internal walls of a 1924 historic building in Seoul. Thermal performance simulations using actual material properties confirmed that all materials, when applied at 120 mm thickness, met the national U-value requirement of 0.240 W/m²·K, with VIP and PF offering notably superior performance. Building energy simulations showed that heating energy consumption was reduced by 11–16% in winter and cooling energy use by 3–7% in summer. Indoor temperature measurements supported improved thermal comfort following insulation retrofitting. Economic analysis revealed that material price was a more decisive factor than performance in determining cost-effectiveness, with PF and EPS demonstrating the most favorable payback periods and net present values. By combining experimental data with simulation-based analysis, the study offers practical guidance for balancing energy performance and heritage conservation in masonry buildings.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal Conductivity Coefficients of FLiNaK Melt with Lanthanide and Actinide Fluoride Additives: A Molecular Dynamic Study","authors":"E. V. Denisov,&nbsp;O. R. Rakhmanova,&nbsp;D. O. Zakiryanov,&nbsp;A. E. Galashev","doi":"10.1007/s10765-025-03599-1","DOIUrl":"10.1007/s10765-025-03599-1","url":null,"abstract":"<div><p>Molten fluoride salts are used in a molten salt reactor, the main advantage of which is the ability to \"burn up\" minor actinides such as americium, neptunium, and curium. The thermal conductivity of molten salts is an important thermophysical property that directly affects the efficiency and economic feasibility in the design and development of high-temperature thermal energy installations. In this work, the temperature dependence of the thermal conductivity and density of molten FLiNaK, containing additives of PuF₃, AmF₃, and NdF₃, was calculated using molecular dynamics. The thermal conductivity was determined using the Green–Kubo and Müller-Plathe methods. A negative linear trend was found in the temperature dependence of density, while a predominantly similar trend in thermal conductivity was also established. The density of the systems increases linearly with the concentration of the introduced additives. According to the thermal conductivity calculations using the Green–Kubo method, at high concentrations, the NdF₃ additive can act as an imitator for PuF₃. However, reducing the concentration of PuF₃ decreases the reliability of such a representation.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate-Responsive Optimization of Phase Change Materials for Energy-Efficient Building Envelopes in Diverse Climatic Regions of Ethiopia","authors":"Yujin Kang,&nbsp;Sumin Kim","doi":"10.1007/s10765-025-03596-4","DOIUrl":"10.1007/s10765-025-03596-4","url":null,"abstract":"<div><p>Passive thermal energy storage systems, notably phase change materials (PCMs), offer promising solutions for improving energy efficiency amid rising global temperatures and increasing cooling demands. To address the need for climate-specific design strategies, this study investigates the thermal performance of PCM-integrated building envelopes across the diverse climatic zones of Ethiopia, a country marked by significant topographical and altitudinal variability. 22 representative locations were selected using the Köppen climate classification system. Five PCMs with distinct phase change temperature (PCT) (21 °C, 23 °C, 25 °C, 27 °C, and 29 °C) were analyzed under three installation scenarios: exterior (Case 1), interior (Case 2), and both sides (Case 3) of the insulation layer. Energy simulations, based on an ASHRAE Standard 90.1-2022 mid-rise apartment prototype, were conducted to assess annual cooling energy demand. Results reveal that the effectiveness of PCM is strongly influenced by both the installation position and the selected PCT. Case 2 generally yielded the most favorable outcomes. For instance, in the cooler highland regions of Robe (Cfb), a PCM with a PCT of 25 °C reduced cooling energy use by over 25 %, whereas in hotter desert areas such as Gode (BWh), PCMs with a PCT of 29 °C were more suitable. These findings highlight the critical role of climate-responsive PCM selection and placement in maximizing energy savings. The proposed optimization approach provides a valuable framework for passive thermal design in regions with similar climatic diversity, pending further empirical validation.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145170924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boosting Solar Distiller Performance Using Floating Polystyrene Balls to Lower the Basin’s Water Surface Tension: 4E Analysis","authors":"Mahmoud Bady,&nbsp;Mohammed El Hadi Attia,&nbsp;Amr Eisa,&nbsp;Abd Elnaby Kabeel","doi":"10.1007/s10765-025-03595-5","DOIUrl":"10.1007/s10765-025-03595-5","url":null,"abstract":"<div><p>Solar distillation offers a sustainable solution to global water scarcity, yet its efficiency depends on optimizing thermophysical properties like surface tension. This study introduces a novel approach to enhance conical solar still performance using floating polystyrene (PS) balls to reduce water surface tension, a previously unexplored method. Unlike chemical surfactants, hydrophobic PS balls disrupt water molecule cohesion, lowering the energy barrier for evaporation without risking contamination. We investigated the impact of PS ball color (white and black) on distillation performance through experiments conducted at El-Oued University, Algeria, on June 30, 2024. Three conical solar stills were tested under identical conditions: a simple conical solar still (SCSS), one with white PS balls (CSS-PB&amp;W), and one with black PS balls (CSS-PB&amp;B). The CSS-PB&amp;B achieved a cumulative yield of 6.35 L·m⁻²·day⁻¹, a 29.59% increase over the SCSS (4.90 L·m⁻²·day⁻¹), while CSS-PB&amp;W yielded 4.40 L·m⁻²·day⁻¹, a 10.20% decrease due to poor sunlight absorption. Black PS balls also improved thermal and exergy efficiencies to 86.88 and 6.27%, respectively, compared to 79.14 and 2.96% for SCSS. Economically, CSS-PB&amp;B reduced the cost per liter to 0.048 $ L⁻¹ (4% interest rate), and environmentally, it mitigated 22.78 tons CO₂ year⁻¹, 1.30 times that of SCSS. These findings highlight the potential of black PS balls to optimize solar still performance through combined surface tension reduction and thermal enhancement, offering a sustainable solution for freshwater production.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal and Flow Properties of Graphene/Fe3O4 Water-Based Hybrid Nanofluids","authors":"Soulayma Gal,&nbsp;David Cabaleiro,&nbsp;Walid Hassen,&nbsp;Housseinou Ba,&nbsp;Patrice Estellé","doi":"10.1007/s10765-025-03601-w","DOIUrl":"10.1007/s10765-025-03601-w","url":null,"abstract":"<div><p>Carbon-iron oxide nanoparticles represent a promising class of hybrid nanomaterials for the development of nanofluids aimed at enhancing heat transfer in thermal systems. This study presents a comprehensive investigation into the thermal conductivity (k), specific heat capacity at constant pressure (C_p), rheological behavior and viscosity (μ) of graphene: Fe₃O₄ (mass ratio of 70:30) dispersions in distilled water, stabilized using a surfactant mixture of karaya gum and cocoamidopropyl betaine. Experimental results were thoughtfully analyzed to elucidate the effects that surfactant mixture’s presence, hybrid nanoparticle’s concentration (0.005–0.100 wt.%) and temperature (283.15–313.15 K) may have on the three thermophysical properties under study. Findings highlight that, while the used surfactant content exerts a negligible influence on thermal conductivity, the addition of graphene-Fe₃O₄ nanoparticles leads to a marked improvement in k, reaching up to a 6% enhancement at a mass concentration of 0.1 wt.%. Modest reductions were observed in the isobaric heat capacity, 0.3–2.4% in the investigated concentration range. Rheological studies showed a transition from the Newtonian behavior of 0.005 and 0.010 wt.% samples to the shear-thinning of 0.025–0.100 wt.%. Finally, results are compared to some theoretical correlations, novel regression models are proposed to describe the temperature and concentration dependence of nanofluid thermal conductivity and viscosity.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coefficient of Thermal Expansion of Si3N4 via Neutron Diffraction","authors":"Geoffrey Swift","doi":"10.1007/s10765-025-03594-6","DOIUrl":"10.1007/s10765-025-03594-6","url":null,"abstract":"<div><p>Time-of-flight Neutron Diffraction was used to obtain diffraction patterns for GS-44 silicon nitride from 20 °C to 1500 °C. These patterns were refined using the Rietveld analysis method. Lattice parameters obtained as a function of temperature from refined diffraction data allowed determination of temperature-dependent thermal expansion coefficients for silicon nitride over this temperature range.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexible and Broadband Long-Wavelength Infrared Radiator Based on a Pixel Pattern Metamaterial for Space Cryogenic Applications","authors":"Yuto Saisho,&nbsp;Sumitaka Tachikawa,&nbsp;Atsushi Sakurai,&nbsp;Yoshihiro Taguchi","doi":"10.1007/s10765-025-03585-7","DOIUrl":"10.1007/s10765-025-03585-7","url":null,"abstract":"<div><p>This study proposes the design of an ultra-far-infrared broadband metamaterial radiator for space cryogenic applications. To achieve a flexible broadband radiator without significant structural complexity, the proposed radiator employs a flexible glass sheet as an intermediate dielectric layer and a QR code-like pixel-patterned periodic metal structure. A genetic algorithm is used to design the radiator, followed by fabrication using microfabrication techniques. The results of the reflectance spectrum measurements by FTIR were in general agreement with the analytical results, thereby confirming the broadband radiation characteristics. The total hemispherical emittance, which is an evaluation index for space radiators, was estimated to be 0.57 at 20 K. Compared with the conventional radiator material of 80-μm black paint, the total hemispherical emittance was markedly enhanced, despite a film thickness ratio of 19.9 % and an area density ratio of 53.7 %. Therefore, the proposed radiator is expected to facilitate the development of cryogenic radiators with reduced weight and flexibility while minimizing the risk of contamination. This is a significant consideration for infrared astronomy missions that require cryogenic temperatures.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10765-025-03585-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Applying significant structure theory on acrylonitrile and 2-alkanol system: theoretical and experimental approach","authors":"Mohammad Almasi","doi":"10.1007/s10765-025-03590-w","DOIUrl":"10.1007/s10765-025-03590-w","url":null,"abstract":"<div><p>Binary mixtures of acrylonitrile (AN) with a homologous series of secondary alcohols (2-propanol, 2-butanol, 2-pentanol, 2-hexanol, and 2-heptanol) were investigated over the temperature interval 293.15–323.15 K, to illustrate their volumetric and viscometric deviations from ideality. Experimental results reveal that, across all compositions, the excess molar volume remains positive but increases with temperature and alkyl chain of alcohol, indicating that thermal agitation and increased hydrophobic character reduce efficient packing in the liquid mixtures. Correspondingly, the viscosity deviation is uniformly negative, with its magnitude becoming more negative for alcohols of greater chain length, reflecting the dominance of weakened dipolar and hydrogen‐bond interactions that facilitate molecular slippage in mixtures containing longer alkyl tails. To describe the viscosity of the pure components, we applied a theoretical model, named significant structure theory, achieving a high degree of precision having a maximum difference of 1.734% for 2-heptanol. This highlights the effectiveness of the proposed model in predicting the viscosity behavior of pure chemicals.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}