ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 9
·2211035
·
IF 19.924
Chuanyue Sun,Jiabei Luo,Shengchang Yan,Kerui Li,Yaogang Li,Hongzhi Wang,Chengyi Hou,Qinghong Zhang
Smart textiles with good mechanical adaptability play an important role in personal protection, health monitoring, and aerospace applications. However, most of the reported thermally responsive polymers has long response time and poor processability, comfort, and wearability. Skin-core structures of thermally responsive fibers with multiple commercial fiber cores and temperature-responsive hydrogel skins are designed and fabricated, which exhibit rapid mechanical adaptability, good thermohardening, and thermal insulation. This universal method enables tight bonding between various commercial fiber cores and hydrogel skins via specific covalently anchored networks. At room temperature, prepared fibers show softness, flexibility, and skin compatibility similar to those of ordinary fibers. As temperature rises, smart fibers become hard, rigid, and self-supporting. The modulus of hydrogel skin increases from 304% to 30883%, showing good mechanoadaptability and impact resistance owing to the synergy between hydrophobic interactions and ionic bonding. Moreover, this synergistic effect leads to an increase in heat absorption, and fibers exhibit good thermal insulation, which reduces the contact temperature of the body surface by ≈25 °C under the external temperature of 95 °C, effectively preventing thermal burns. Notably, the active mechanoadaptability of these smart fibers using conductive fibers as cores is demonstrated. This study provides feasibility for fabricating environmentally adaptive intelligent textiles.
研究领域:
材料科学
·
生物医学工程
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2023
·Vol. 9
·期 9
·749
·
IF 4.6
Zhi Li,Kai Shen,Min Hu,Yury M. Shulga,Zhenkui Chen,Qiong Liu,Ming Li,Xiaoxu Wu
In this work, we prepared heat-treated aramid pulp/silica aerogel composites (AP/aerogels) and investigated in detail the feasibility of improving thermal stability and thermal insulation via tailored heat treatment. The microstructure and FTIR spectra reveal that AP/aerogels are formed by a physical combination of the silica aerogel matrix and aramid pulps. When the heat treatment temperature increases, the density slightly decreases and then increases to the maximum due to the significant volume shrinkage. The pyrolysis of aramid pulp and the collapse of silica skeletons occur during heat treatment; nevertheless, the typical structures of AP/aerogels do not change significantly. It is also found that both the hydrophobicity and the thermal insulation decrease with the increasing heat treatment temperature. We note that when the heat treatment is at 600 °C, the AP/aerogel still maintains a low density of 0.19 g/cm3and a contact angle of 138.5°. The thermal conductivity is as low as 26.11 mW/m/K, measured using the transient hot wire method. Furthermore, the heat-treated AP/aerogels can avoid heat shock and possible thermal hazards during practical thermal insulation applications. The onset temperatures of the thermal decomposition of AP/aerogels increase from 298.8 °C for an untreated one to 414.7 °C for one treated at 600 °C, indicating that the thermal stability of AP/aerogels is improved significantly. This work provides a practical engineering approach to expand the thermal insulation applications of silica aerogel composites.Keywords:silica aerogel;aramid pulp;heat treatment;thermal stability;thermal insulation
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hantao Li,Xuewei Luo,Shuo Huang,Kaiyun Li,Sheng Zhang,Hongyun Jin
Single-phase high entropy ceramic (Ca 0.5 Sr 0.5 )(5RE) 2 O 4 (RE = Y, Sm, Gd, Dy, Yb) (CSHO) with anti-spinel structure was synthesized via solid-state reaction method. The CSHO has good high-temperature phase stability at 1600 °C for 10–50 h. In addition, the CSHO ceramics exhibit much lower thermal conductivity and higher thermal expansion coefficient than that of SrY 2 O 4 , towing to the intensified phonon-point defect scattering and the enhanced anharmonic vibrations of the lattice. The thermal conductivity of CSHO is 1.48–1.81 W∙m −1 K −1 (25–1500 °C), and the thermal expansion coefficient is 11.5–12.0 × 10 −6 K −1 (1000–1500 °C). The obtained results suggest that CSHO has the potential to become the next-generation thermal barrier coating materials.
研究领域:
材料科学
·
热物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Bowen Zhang,Xinyan Lu,Haonan Feng,Youzheng Wang,Yi Liu,Yun-Hui Mei
The high-power density of silicon carbide (SiC) devices requires the development of thermal interface materials (TIM) for rapid heat dissipation between direct bond copper (DBC) substrate and heat sink. However, the insufficient oxygen in the central bonding layer prevents the complete decomposition of organic solvents in silver paste, resulting in weak thermal dissipation. In this study, the Self-Oxygenation silver paste (SO-Ag) was successfully developed to promote the complete decomposition of organic solvents in N 2 environment, with -C-O- peak energy residual of 0.35 %. The in-situ generation of silver nanoparticles effectively enhanced the necking growth and achieved a highly reliable large-area bonding of 25 × 25 mm 2 under a pressureless sintering process. Taking advantage of the dense bonding layer and uniform porosity distribution, the proposed SO-Ag paste effectively mitigates the heat accumulation and reduces the chip temperature from 314 °C to 47 °C under forced water convection conditions. Furthermore, after 1000 cycles of thermal shock test (TST), the thermal resistance of SO-Ag increased by only 28 % without heat accumulation, indicating superior thermal reliability. The results confirm the superior thermal dissipation reliability of proposed SO-Ag, which enables the long-term operation of SiC devices.
研究领域:
材料科学
·
热工学
·
电力电子
·
纳米技术
·
电子封装
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 11
·e70112
·
IF 3.8
Bin Liu,Na Zhang,Cui Zhou,Sikai Wang,Jialin Li,Tiefeng Du,Luchao Sun,Jingyang Wang
Rare-earth aluminate (REAlO 3 ) has emerged as a highly promising candidate material for thermal barrier coatings due to its remarkable properties such as high thermal stability and low thermal conductivity. In this study, a novel quaternary rare-earth aluminate, (La 0.25 Sm 0.25 Gd 0.25 Ho 0.25 )AlO 3 , was synthesized via entropy-driven design. Its phase composition and mechanical and thermal properties were systematically investigated. The findings indicate that this material exhibits enhanced ductility with a shear modulus of 114.63 GPa and a Pugh's ratio of 0.63, surpassing that of single-principal element REAlO 3 ceramics. Furthermore, it demonstrates a reduced thermal conductivity of 4.11 W m −1 K −1 at room temperature and a coefficient of thermal expansion of 10.10 × 10 −6 K −1 from 25°C to 1300°C, which is well matched to superalloy substrates.
研究领域:
材料科学
·
陶瓷材料
·
热工学
·
固态物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 33
·期 20
·11309-11320
·
IF 2.3
Zhang Dongbo,Feng Xiaolong,Song Ruiqing,Wang Ning,Zhang Yongsheng
Thermal barrier coating (TBC) is applied to protect the hot-section components of a gas turbine engine. In the present work, a La 2 (Zr 0.2 Ti 0.2 Y 0.2 YB 0.2 Nb 0.2 ) 2 O 7 high entropy oxide was designed, fabricated by a solid-phase reaction at 1400 °C, and subjected to an investigation of its properties. The results indicate that the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 high entropy oxide had a pyrochlore structure. During synthesis, a small amount of La 2 TiO 5 was produced. The thermal conductivity of the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 high entropy oxide was approximately 0.8855 W·m -1 ·K -1 at room temperature. The coefficient of thermal expansion of the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 high entropy oxide was approximately 9.374 × 10 −6 K −1 at 1000 °C. To improve the service life of the TBC composed of the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 , a double-layer structural coating composed of La 2 (Zr 0.2 Ti 0.2 Y 0.2 YB 0.2 Nb 0.2 ) 2 O 7 and yttria-stabilized zirconia (YSZ) layers was designed and produced on a NiCoCrAlY alloy by laser cladding. The thermal cycling behavior of the double-layer coating was studied at 1050 °C. The results indicate that a La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 single-phase defective-fluorite high entropy oxide was produced after preparation and thermal cycling. The spallation of the double-layer coating composed of La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 /YSZ occurred after 70 thermal cycles at 1050 °C. The double-layer coating composed of La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 /YSZ can increase the thermal cycling lifetime of TBCs containing high entropy oxides.
研究领域:
材料科学
·
表面工程
·
陶瓷材料
·
高温材料
·
热障涂层技术
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Rongkun Pan,Chensheng Wang,Qingsheng Zhang,Chenzhuo Song,Chang Lu,Ligang Zheng,Bei Pei,Lei Chen
In this paper, staged thermal characteristic experiments were conducted on commonly used powder explosion suppressants using a high-precision C600 microcalorimeter. The thermal decomposition process was divided into three stages, and a comprehensive analysis was carried out on the thermal flow curves, dHF, initial heat flow value H 0 , minimum heat flow value H min , characteristic points, and heat absorption amount Q of twelve powder explosion suppressants, including attapulgite and montmorillonite. The results indicate that carbamide has the smallest minimum heat flow value H min during powder thermal decomposition, while CaCO 3 has the largest minimum heat flow value H min . Carbamide exhibited the highest overall heat absorption amount, while NaCl showed the lowest overall heat absorption amount. The mechanism of inhibiting methane explosion with different powder suppressors was analyzed by comparing the pyrolysis experiment results. The conclusions of this study can serve as a theoretical foundation for the rational selection of powder explosion suppressors, enhancing their utilization rate, and improving their explosion suppression effectiveness.
研究领域:
化学工程
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
BMC Chemistry
·
2024
·Vol. 18
·期 1
·1-13
·
IF 4.3
Chen Jialin,Li Shutao,Dai Mengnan,An Ming,Song Rui,Chen Yeqing,Song Jiaxing,Tian Quanwei,Zhong Xiting,Yan Qiushi
To improve the thermal and combustion properties of nanothermites, a design theory of changing the state of matter and structural state of the reactants during reaction was proposed. The Al/MoO 3 /KClO 4 (Kp) nanothermite was prepared and the Al/MoO 3 nanothermite was used as a control. SEM and XRD were used to characterize the nanothermites; DSC was used to test thermal properties; and constant volume and open combustion tests were performed to examine their combustion performance. Phase and morphology characterization of the combustion products were performed to reveal the mechanism of the aluminothermic reaction. The results show that the Al/MoO 3 /Kp nanothermite exhibited excellent thermal properties, with a total heat release of 1976 J·g − 1 , increasing by approximately 33% of 1486 J·g − 1 of the Al/MoO 3 nanothermite, and activation energy of 269.66 kJ·mol − 1 , which demonstrated higher stability than the Al/MoO 3 nanothermite (205.64 kJ·mol − 1 ). During the combustion test, the peak pressure of the Al/MoO 3 /Kp nanothermite was 0.751 MPa, and the average pressure rise rate was 25.03 MPa·s − 1 , much higher than 0.188 MPa and 6.27 MPa·s − 1 of the Al/MoO 3 nanothermite. The combustion products of Al/MoO 3 nanothermite were Al 2 O 3 , MoO, and Mo, indicating insufficient combustion and incomplete reaction, whereas, the combustion products of Al/MoO 3 /Kp nanothermite were Al 2 O 3 , MoO, and KCl, indicating complete reaction. Their “coral-like” morphology was the effect of reactants solidifying after melting during the combustion process. The characterization of reactants and pressure test during combustion reveals the three stages of aluminothermic reaction in thermites. The excellent thermal and combustion performance of Al/MoO 3 /Kp nanothermite is attributed to the melt and decomposition of Kp into O 2 in the third stage. This study provides new ideas and guidance for the design of high-performance nanothermites.
研究领域:
材料科学
·
燃烧学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2018
·
IF 2.189
Xiaosheng Du,Jingchuan Li,Shuang Wang,Haibo Wang,Xu Cheng,Zongliang Du
A series of novel polyurethane foams (PUFs) with polyethylene oxide segments as side chain were prepared by adding diethanolamine modified methoxypolyethylene glycol (DMPEG) into the foaming system. Differential scanning calorimetry (DSC) results indicated that the PUFs with polyethylene oxide segments as side chain exhibited much higher thermal energy storage (TES) capacity than PUFs with polyethylene oxide segments as main chain. Besides, the TES capacity of PUFs improved with increasing weight percentage of DMPEG added to the foaming system. Thermal conductivity testing and computer-aided thermal measurement indicated that the addition of DMPEG into the foaming system significantly improved the thermal insulating property and thermoregulation property of the PUFs. The cell diameter, compressive strength, and compressive modulus of PUFs decreased slightly with increasing amount of DMPEG added to the foaming system. The accelerated thermal cycling test and thermogravimetric analysis showed that the synthesized PUFs exhibited good thermal reliability and stability, which is highly important for thermal energy storage applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Kun-Hao Liang,Zhong-Wu Lu,Cai-Xia Ren,Jie Wei,Da-Wei Fang
As an improvement on imidazolium amino acid ionic liquids, three ionic liquids, 1-ethyl-4-butyl-1,2,4-triazolium acetylglycine [Taz(2,4)][Acgly], 1-ethyl-4-butyl-1,2,4-triazolium acetylalanine [Taz(2,4)][Acala], and 1-ethyl-4-butyl-1,2,4-triazolium acetylcysteine [Taz(2,4)][Accys], were first synthesized for future application as heat-transfer media. The density, surface tension, isobaric heat capacity, and thermal conductivity were measured in different experimental temperature ranges. Based on the above experimental data, the isobaric thermal expansibility and isentropic and isothermal compressibility, as well as the isochoric heat capacity and heat-storage density, were also calculated. Compared with several popular commercial heat-transfer fluids, it was found that the ionic liquids studied in this work have better performance in terms of heat-storage density of ∼2.38 MJ·cm–3·K–1 and thermal conductivity of ∼0.197 W·m–1·K–1. In addition, the viscosity was also determined, and the results showed an unexpected reduction by the introduction of a small amount of water for ionic liquids and almost no influence on other thermophysical properties. Finally, we selected a specific heat-transfer process and calculated the heat-transfer coefficient and the heat-transfer area based on the thermophysical properties. Meanwhile, the lower liquid temperature limit (∼229 K) and the nontoxic, environmentally friendly anion could provide a wider and safer environment for the application of ionic liquids. Given this, the ionic liquids studied in this work, especially the [Taz(2,4)][Acgly], could be considered as promising heat-transfer fluid candidates by appropriate adjustment of the water content.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Science Advances
·
2024
·Vol. 10
·期 49
·
IF 11.7
Xiaoxiang Li,Jingyi Zhang,Yizhe Liu,Yangzhe Xu,Yixuan Xie,Ting Hu,Benwei Fu,Chengyi Song,Wen Shang,Peng Tao,Tao Deng
Solar-thermal energy storage (STES) within solid-liquid phase change materials (PCMs) has emerged as an attractive solution to overcome intermittency of renewable energy. However, current storage systems usually suffer from slow charging rates, sacrificed storage capacity, and overheating tendency. Inspired by the thermoregulation behavior of Cyprinid fish, here, we present a quick-responsive, ultrafast, large-capacity, overheating-protective STES strategy. We fabricate a liquid-infused solar-absorbing foam charger that can rapidly advance the receding solid-liquid charging interface to efficiently store solar-thermal energy as latent heat and spontaneously float upward to cease the charging process upon overheating. This bioinspired dynamic charging is adaptable to a variety of PCMs, unlocking the potential for safe and efficient utilization of renewable thermal energy.
研究领域:
能源科学
·
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Zhichen Ba,Fanjun Yu,Yimin Shi,Haobo Fan,Zengcheng He,Yonggui Wang,Daxin Liang,Haigang Wang,Zefang Xiao,Zhe Qiu,Yanjun Xie
Thermal energy storage wood (TESW) is a passive energy-efficient building material that effectively regulates indoor temperature and homogenizes the heat distribution. However, the energy storage performance of TESW is diminished by leakage. In addition, the flammable phase change materials incorporated within the wood are potential fire hazards. In this study, TESW with flame-retardant and anti-leakage (P 9 A 1 –UP–wood C ) was prepared by impregnating wood cell lumen with polyethylene glycol (PEG), phytic acid, urea and acrylic acid, and thermally initiating cross-linking. Accordingly, the enthalpy and phase change temperature of P 9 A 1 –UP–wood C were 47.98 J g −1 and 25.07 °C, respectively. Meanwhile, 98.95 % of the enthalpy remained after 100 cycles. In addition, the total smoke release of P 9 A 1 –UP–wood C was reduced by 28.61 % from that of raw wood (wood C ), and the production rates of CO 2 and CO during the combustion process were also significantly decreased, indicating good smoke-suppressing and toxicity-reducing effects of the flame retardants. The building-energy efficiency of the TESW was simulated in Designbuilder software. This flame-retardant, leakage-resistant TESW prepared via a toxic solvent-free method can improve the safety and long-term stability of passive energy-saving materials and promotes the storage and reuse of low-grade thermal energy.
研究领域:
建筑材料
·
储能
·
消防安全工程
·
被动式建筑设计
·
热管理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）