JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Junjie Chen,Bo Jin,Guan Luo,Huihui Liu,Qingchun Zhang,Qi Huang,Rufang Peng
The thermodynamics and kinetics of the curing reactions between polyglycidyl nitrate (PGN) and toluene diisocyanate, isophorone diisocyanate, and polyaryl polymethylene isocyanate (PAPI) were studied by microcalorimetry. The reaction rate between PGN and PAPI was the fastest among the three reactions above. Three thermodynamics ( i.e. , activation enthalpy, entropy, and free energy), rate constant, and three thermokinetic parameters ( i.e. , activation energy, pre-exponential constant, and reaction order) of the curing reactions were obtained by calculating the results of the reaction between PGN and PAPI at a series of temperature from 303.15 K to 318.15 K. The linear relationship between ln k and the mole ratio of the isocyanate and hydroxyl groups was observed. The corresponding kinetic equation describing the curing reaction between PGN and PAPI was d α /d t = 10 −3.83 (1 − α ) 3.04 at 318.15 K.
研究领域:
高分子化学
·
热力学
·
反应动力学
·
功能材料
·
含能材料
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 18
·期 11
·2400151
·
IF 9.8
Jiaoyin Zhao,Jiwen Chang,Nan Wang,Peihang Zhao,Mengyuan Zhu,Ying Liu,Dongxu Guo,Yu Wang,Panlai Li,Zhijun Wang,Hao Suo
Thermal quenching of luminescence materials poses a major obstacle to the technological application of luminescence thermometry. It still remains challenging to attain thermally enhanced light emissions, especially in the second near-infrared window (NIR-II). Herein, an anomalous thermal dependence of NIR-II luminescence in the negative thermal expansion (NTE) Sc 2 Mo 3 O 12 :Er 3+ /Ho 3+ nanocrystals is reported. Mechanistic investigations affirm that Ho 3+ ion can work as an energy reservoir and back-transfer to Er 3+ ion with the assistance of lattice phonon at elevated temperatures. Moreover, the Ho 3+ -mediated energy feedback is strengthened by the thermal contraction between dopant ions, thereby enabling a remarkable thermal enhancement of NIR-II emission over 11-fold. The opposite thermal response of Er 3+ and Ho 3+ emissions is harnessed for NIR-II ratiometric thermometry, registering exceptional performance in a high-temperature regime ( S r = 1.71% K −1 , δT = 0.2 K at 513 K). These findings may inspire new insights for addressing the thermal quenching of NIR-II luminescence, which also raises exciting opportunities for flexible thermometry in complex settings.
研究领域:
材料科学
·
光学材料
·
纳米科技
·
生物医学工程
·
分子成像
·
温度传感
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 23
·32641-32647
·
IF 4.527
Wei Liao,Yongqiang Tan,Chaowen Zhu,Zhen Teng,Peng Jia,Haibin Zhang
Multi-components and equimolar rare earth monosilicates, (Y 1/3 Dy 1/3 Er 1/3 ) 2 SiO 5 , (Y 1/3 Dy 1/3 Lu 1/3 ) 2 SiO 5 , (Y 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 and (Yb 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 , were prepared by solid-state reactions and the following hot-pressing. Dense microstructures with uniform elemental distributions were obtained for all samples. These investigated multi-components monosilicates exhibit low thermal conductivities and similar coefficients of thermal expansion with SiC. Moreover, they exhibit high corrosion resistances in 1400 °C water vapor , especially, four-components (Y 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 and (Yb 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 experienced almost invariable weights after small weight losses during the initial 0.5 h. All those results indicate that multi-components rare earth monosilicates are promising candidates of environmental barrier coatings for SiC/SiC composites.
研究领域:
材料科学
·
无机非金属材料
·
高温防护涂层
·
陶瓷基复合材料
·
表面工程
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Gaoshuai Jia,Zhi Deng,Dixing Ni,Zhaoran Ji,Diancheng Chen,Xinxin Zhang,Tao Wang,Shuai Li,Yusheng Zhao
All-solid-state lithium batteries (ASSLBs) have attracted much attention owing to their high safety and energy density compared to conventional organic electrolytes. However, the interfaces between solid-state electrolytes and electrodes retain some knotty problems regarding compatibility. Among the various SSEs investigated in recent years, halide SSEs exhibit relatively good interfacial compatibility. The temperature-dependent interfacial compatibility of halide SSEs in solid-state batteries is investigated by thermal analysis using simultaneous thermogravimetry and differential scanning calorimetry (TG–DSC) and X-ray diffraction (XRD). Halide SSEs, including rock-salt-type Li3InCl6 and anti-perovskite-type Li2OHCl, show good thermal stability with oxides LiCoO2, LiMn2O4, and Li4Ti5O12 up to 320 °C. Moreover, anti-perovskite-type Li2OHCl shows a chemical reactivity with other battery materials (eg., LiFePO4, LiNi0.8Co0.1Mn0.1O2, Si-C, and Li1.3Al0.3Ti1.7(PO4)3) at 320°C, which reaches the melting point of Li2OHCl. It indicated that Li2OHCl has relatively high chemical reactivity after melting. In contrast, rock-salt-type Li3InCl6 shows higher stability and interfacial compatibility. This work delivers insights into the selection of suitable battery materials with good compatibility for ASSLBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
固体离子学
·
电池技术
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Hanyi Zhong,Ying Guan,Jian Su,Xianbin Zhang,Ming Lu,Zhengsong Qiu,Weian Huang
In this study, bentonite hydrothermal carbon composites (BHCCs) were fabricated by green and facile hydrothermal carbonization , employing glucose as the carbon source and bentonite as the template. BHCCs were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The effects of the BHCCs on the rheological and filtration properties of bentonite dispersions were investigated before and after thermal aging at 220 °C and 240 °C, respectively. The results demonstrated that, unlike conventional synthetic polymers , the BHCCs exhibited a minor influence on the rheology of bentonite dispersion and had extraordinary filtration control both before and after ultra-high-temperature aging. The incorporation of BHCCs helped introduce the oxygenated groups with carbon species, thereby enhancing the dispersion stability of bentonite particles. The spherical nano-sized carbon particles in BHCCs filled the gaps between large particles in the filter cake. The above factors contributed to excellent filtration control under hostile, high-temperature conditions.
研究领域:
材料科学
·
石油工程
·
环境化学
✓ 已验证
DOI
高影响因子
Journal of Renewable Materials
·
2022
·
IF 2.115
Jianjun Guo,Lingling Jia,Sandra Senyo Fometu,Qiang Ma,Jinjin Wang,Hang Li,Lei Jiang,Guohua Wu
Traditionally, silkworm silk has been used to make high-quality textiles. Nevertheless, various wastes from silkworm silk textiles that are no longer used are increasing, which is also causing considerable waste and contamination. This issue is causing widespread concern in countries that use more silk. Regenerated silk fibroin (RSF) fibers have been shown to be fragile and tender, which prohibits RSF from being widely used as a structural component. Therefore, enriching the function of silk and enhancing the RSF mechanical properties are important directions to expand the comprehensive utilization of silk products. In the present research, wet spinning was used to create a series of RSF/tungsten disulfide (WS 2 ) nanoparticles (NPs) hybrid fiber having distinct WS 2 nanoparticles concentrations. It was discovered that the temperature of hybrid fibers containing 0.8 wt% RSF/WS 2 nanoparticles might climb from 20.4°C to 85.6°C in 1 min and 108.3°C in 10 min after being exposed to simulated sunlight for a period of one minute and ten minutes. It also had certain antibacterial activity and thermal stability. Fabrics created by hand mixing had outstanding photothermal characteristics under natural sunlight. Furthermore, adding WS 2 nanoparticles might increase the tensile properties of hybrid fibers, which could be caused by the reality that the blending of WS 2 nanoparticles inhibited the self-assembly of β-sheets in RSF reaction mixture in a dosage-dependent way, as evidenced by the fact that RSF/WS 2 nanoparticles hybrid fibers had lesser β-sheets material, crystalline nature, and crystalline size. The above performance makes the RSF/WS 2 nanoparticles hybrid fibers promising candidates for application in photothermal fabrics as well as military clothing.
研究领域:
材料科学
·
纺织工程
·
高分子物理
·
纳米复合材料
·
光热转换
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 51
·1805365
·
IF 13.325
Peng Min,Jie Liu,Xiaofeng Li,Fei An,Pengfei Liu,Yuxia Shen,Nikhil Koratkar,Zhong-Zhen Yu
Phase change materials (PCMs) have triggered considerable attention as candidates for solar-thermal energy conversion. However, their intrinsic low thermal conductivity prevents the rapid spreading of heat into the interior of the PCM, causing low efficiencies in energy storage/release. Herein, anisotropic and lightweight high-quality graphene aerogels are developed by directionally freezing aqueous suspensions of polyamic acid salt and graphene oxide to form vertically aligned monoliths, followed by freeze-drying, imidization at 300 °C and graphitization at 2800 °C. After impregnating with paraffin wax, the resultant phase change composite (PCC) exhibits a high transversal thermal conductivity of 2.68 W m −1 K −1 and an even higher longitudinal thermal conductivity of 8.87 W m −1 K −1 with an exceptional latent heat retention of 98.7%. When subjected to solar radiation, solar energy is converted to heat at the exposed surface of the PCC. As a result of the PCC's high thermal conductivity in the thickness direction, heat can spread readily into the interior of the PCC enabling a small temperature gradient of <3.0 K cm −1 and a fast charging feature. These results demonstrate the potential for real-time and fast-charging solar-thermal energy conversion using phase change materials with tailored anisotropy in their thermal properties.
研究领域:
材料科学
·
热能工程
·
纳米材料
·
能源材料
·
功能材料
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Chonghai Wang,Haiming Cheng,Changqing Hong,Xinghong Zhang,Tao Zeng
A chopped carbon fibre (CF) reinforced silica-phenolic resin (Si/PR) aerogel nanocomposite was prepared through a simple one-pot sol-gel polymerization in a slurry of CF, PR, silane , hexamethylenetetramine and ethylene glycol. CFs were distributed homogeneously and randomly in the Si/PR aerogels. The Si/PR aerogels exhibit finer microstructure , higher thermal stability and better anti-oxidation resistance than PR aerogels. The compressive strength for the composites with low densities between 0.402 and 0.463 g/cm 3 ranged from 0.33 to 2.44 MPa and thermal conductivities from 0.089 to 0.116 W/(mK), respectively. Furthermore, the CF/Si/PR aerogel nanocomposites could deliver linear ablation rates as low as 0.117 mm/s, and internal temperature peaks approximately 100 °C at 38 mm in-depth position as the surface temperature exceeded 1800 °C in oxyacetylene flame. From mentioned above, this lightweight composite presents huge application prospects in thermal protection and heat insulation field, especially in aerospace industry.
研究领域:
材料科学
·
高分子化学
·
复合材料工程
·
航空航天材料
·
热力学与传热学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 13
·期 6
·4142-4149
·
IF 10.7
Xiaoling Sun,Yitong Li,Dewen Zeng,Zhiwei Zeng,Chen Gong,Changyi Wu,Hongyi Chen
The energy efficiency of batteries is generally compromised by internal resistance and polarization, which lead to considerable energy losses in widespread applications. Herein, we save the electrical energy and enhance energy efficiency by simultaneously charging Zn-ion batteries using waste heat and electricity. Using first-principles calculations and the modified Nernst equation, a high entropy Layered Double Hydroxide (LDH) reaction was introduced into the anode of a NiHCF/Zn battery, leading to a record absolute temperature coefficient of 3.157 mV K−1 and a massive heat absorption during the charging process. Then the modified battery was charged at 45 °C and normally discharged at 5 °C, significantly saving 11.23% of electrical energy during charging and elevating the energy efficiency to 105.16%. Additionally, the NiHCF/Zn-LDH battery exhibits extraordinary stability, enduring over 1000 charge/discharge cycles with a capacity fade of less than 4.27%. This work demonstrates that large energy saving and surpassing 100% energy efficiency through heat charging are feasible, presenting a potential technology for enhancing energy conservation in battery applications.
研究领域:
电化学
·
能源材料
·
物理化学
·
储能技术
·
热电转换
✓ 已验证
DOI
高影响因子
Crystals
·
2017
·Vol. 7
·期 9
·257
·
IF 1.566
Rui Liu,Xing Tan,Guangkun Ren,Yaochun Liu,Zhifang Zhou,Chan Liu,Yuanhua Lin,Cewen Nan
Polycrystalline Bi2Se3−xTex(x = 0~1.5) samples were prepared by self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering (SPS) and their thermoelectric properties were investigated. The SHS-SPS process can shorten the time with few energy consumptions, and obtain almost pure Bi2Se3-based phases. Consequently, the Se vacancies and anti-site defects contribute to the converged carrier concentration of ~2 × 1019cm−3while the increased carrier effective mass enhances the Seebeck coefficient to more than −158 μV K−1over the entire temperature range. The lattice thermal conductivity is suppressed from 1.07 Wm−1K−1for the pristine specimen to ~0.6 Wm−1K−1for Te-substitution samples at 300 K because of point defects caused by the difference of mass and size between Te and Se atoms. Coupled with the enhanced power factor and reduced lattice thermal conductivity, a highZTof 0.67 can be obtained at 473 K for the Bi2Se1.5Te1.5sample. Our results reveal that Te-substitution based on the SHS-SPS method is highly-efficient and can improve the thermoelectric properties of Bi2Se3-based materials largely.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
·
热电转换
✓ 已验证
DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2023
·Vol. 154
·期 3
·367-377
·
IF 1.8
Guo Xuejing,Zhang Yewen,Peng Yanqing
Application of solar thermal energy relies on photothermal effect is one of the emerging topics in green chemical research. Polyethylenimine-grafted graphene oxide (PEI@GO) can harvest thermal energy directly from visible light and be employed as photothermal catalyst in model reactions. Furthermore, this nanocomposite used in carbon dioxide capture-and-release processes relied on photothermal regeneration. Graphical abstract
研究领域:
材料科学
·
纳米技术
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 48
·2406179
·
IF 13
Jiao Li,Wenlong Xu,Kangpeng Jin,Wanjia Zhang,Xiaoqing Lu,Guilong Pan,Tianyu Zhong,Xiyang Wang,Zhan Shi,Biao Xu,Yue Lou
For Bi x Sb 2− x Te 3 (BST) in thermoelectric field, the element ratio is easily influenced by the chemical environment, deviating from the stoichiometric ratio and giving rise to various intrinsic defects. In P-type polycrystalline BST, Sb Te and Bi Te are the primary forms of defects. Defect engineering is a crucial strategy for optimizing the electrical transport performance of Bi 2 Te 3 -based materials, but achieving synchronous improvement of thermal performance is challenging. In this study, mesoporous SiO 2 is utilized to successfully mitigate the adverse impacts of vacancy defects, resulting in an enhancement of the electrical transport performance and a pronounced reduction in thermal conductivity. Crystal and the microstructure of the continuous modulation contribute to the effective phonon–electronic decoupling. Ultimately, the peak zT of Bi 0.4 Sb 1.6 Te 3 /0.8 wt% SiO 2 (with a pore size of 4 nm) nanocomposites reaches as high as 1.5 at 348 K, and a thermoelectric conversion efficiency of 6.6% is achieved at Δ T = 222.7 K. These results present exciting possibilities for the realization of defect regulation in porous materials and hold reference significance for other material systems.
研究领域:
材料科学
·
热电学
·
纳米技术
·
固体物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）