JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Ying Zhang,Junshuai Chen,Taotao Zhan,Xiangyang Liu,Maogang He
Ethyl myristate is one of the main components of biodiesels and its thermophysical properties are critical to be supplemented and perfected. In this work, the speed of sound and thermal diffusivity of ethyl myristate were measured by the light scattering method. The investigated temperature and pressure is ranged from 303.15 K to 560.15 K and up to 10 MPa. The relative expanded uncertainties of the speed of sound and thermal diffusivity were estimated to be less than 1.3% and 2.6% (k = 2), respectively. The correlations for the speed of sound and thermal diffusivity as function of temperature and pressure were presented based on the experimental data. The absolute average deviations (AADs) between the experimental data and the calculated results are 0.04% for the speed of sound at atmospheric pressure, 0.07% for the speed of sound at p > 0.1 MPa and 0.28% for the thermal diffusivity , respectively.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Honggang Luo,Yifei Zhang
Efficient ionic thermoelectric (i-TE) conversion relies on maximizing the thermal diffusion asymmetry between cations and anions. However, sustainable strategies for directing cation-selective thermodiffusion through structural engineering remain largely underexplored. Here, we report an all-wood ionic gel (RW i-TE) that achieves superior thermopower enabled by a lignocellulose channel reconstruction strategy within the wood cell wall. Partial dissolution and regeneration of delignified wood, followed by reintroduction of sodium lignosulfonate (Na:lignin) under hydrogen bond-disrupting conditions (NaOH and urea), enables molecular-level integration between dissociated cellulose and Na:lignin, while simultaneously inhibiting microfibril reassembly. The resulting reconstructed lignocellulose ion channels, enriched with surface negative charges and spatially confined fixed anions, promote rapid and selective cation migration driven by a temperature gradient. As a result, the optimized RW i-TE achieves a high thermopower (S i ) of +39.1 mV K −1 and an ionic figure of merit (zT i ) of 1.68 at 50 % relative humidity, delivering an energy density of 68.75 J m −2 over 2 h of discharging under a 5 K temperature gradient in generator mode. Moreover, this strategy is compatible with various woody and gramineous biomass sources, offering a renewable alternative to polymer-ionic liquid gels by enabling structure-induced ion confinement within regenerated lignocellulose matrices.
研究领域:
材料科学
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能源技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Du Xinyuan,Li Jiapu,Niu Guangda,Yuan Jun-Hui,Xue Kan-Hao,Xia Mengling,Pan Weicheng,Yang Xiaofei,Zhu Benpeng,Tang Jiang
Lead halide perovskites have exhibited excellent performance in solar cells, LEDs and detectors. Thermal properties of perovskites, such as heat capacity and thermal conductivity, have rarely been studied and corresponding devices have barely been explored. Considering the high absorption coefficient (10 4 ~10 5 cm −1 ), low specific heat capacity (296–326 J kg −1 K −1 ) and small thermal diffusion coefficient (0.145 mm 2 s −1 ), herein we showcase the successful use of perovskite in optoacoustic transducers. The theoretically calculated phonon spectrum shows that the overlap of optical phonons and acoustic phonons leads to the up-conversion of acoustic phonons, and thus results in experimentally measured low thermal diffusion coefficient. The assembled device of PDMS/MAPbI 3 /PDMS simultaneously achieves broad bandwidths (−6 dB bandwidth: 40.8 MHz; central frequency: 29.2 MHz), and high conversion efficiency (2.97 × 10 −2 ), while all these parameters are the record values for optoacoustic transducers. We also fabricate miniatured devices by assembling perovskite film onto fibers, and clearly resolve the fine structure of fisheyes, which demonstrates the strong competitiveness of perovskite based optoacoustic transducers for ultrasound imaging.
研究领域:
材料科学
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医学影像
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Science China-Materials
·
2025
·
IF 7.4
Guo Ruiang,Li Shuaiqi,Zhang Jiawei,Tian Yi,Dong Weiguo,He Duanwei
Diamond is known as the ultimate semiconductor owing to its excellent physical properties. However, the high difficulty of n-type doping and the poor electrical performance of n-type diamonds remain major challenges for the application of diamond semiconductor materials. In this paper, a high-pressure thermal diffusion method for the n-type doping of diamond, which utilizes high pressure to reduce the volume difference between phosphorus atoms and carbon atoms, is reported for the first time. This method can achieve efficient doping and ionization of phosphorus atoms at the lattice sites of diamond. The prepared phosphorus-doped diamond exhibited the lowest resistivity (2 Ω cm) and highest electron concentration (2.27 × 10 18 cm −3 ) observed in any known phosphorus-doped diamond single crystal at room temperature (300 K). The high-pressure thermal diffusion method provides an effective approach for diamond n-type doping, which may play an important role in the design and preparation of future diamond-based semiconductor devices.
研究领域:
材料科学
·
半导体物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhen Wan,Cheng Li,Ronghui Liu,Wei Zhou,Wenjing Fan,Chuanxue Huang,Yang Liu
Two-dimensional (2D) Ti3C2Tx MXene materials show great potential in electrochemical and flexible sensors due to their high electrical conductivity, good chemical stability, and special delaminated structure. However, their thermal properties were rarely studied, which remarkably affect the stability and safety of various devices. Here, we fabricated a suspended MXene drum resonator photothermally driven by a sinusoidally modulated laser, measured the thermal time constant by demodulating the thermomechanical motion, and then calculated the thermal conductivity and thermal diffusivity of the MXene film. Experiments show the thermal conductivity of the film increases from 3.10 to 3.58 W/m·K while the thermal diffusivity from 1.06 × 10–6 to 1.22 × 10–6 m2/s when temperature increases from 300 to 360 K. We also confirm the film thermal conductivity is mainly contributed by phonon transport rather than electron transport. Furthermore, the relationship between the mechanical and thermal properties of the MXene films was disclosed. The thermal conductivity decreases when film strain increases, caused by enhanced phonon scattering and softening of high-frequency phonons. The measurements provide a noninvasive method to analyze the thermal characteristics of suspended MXene films, which can be further extended to the thermal properties of other 2D materials.
研究领域:
材料科学
·
热物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2019
·
IF 2.514
Ying Zhang,Taotao Zhan,Junshuai Chen,Xiangyang Liu,Maogang He
The use of ethyl decanoate combined with conventional diesel or biodiesel could be economically attractive. Thermophysical properties of ethyl decanoate at high temperatures can be an essential guidance for the structural design and optimization of the fuel injection system in diesel engine. The measurements of the speed of sound and the thermal diffusivity of ethyl decanoate (EeC10: 0) were carried out by the light scattering method, which are along five isobaric lines from (0.1–10) MPa at the temperatures (300.71–562.07) K and (295.34–565.49) K, respectively. The expanded relative uncertainties ( k = 2) of the measurement systems are estimated to be 1.2% for speed of sound and 2.4% for thermal diffusivity. The thermal conductivities of ethyl decanoate at pressures up to 10 MPa and in the temperature range (303–363) K are derived, which agree well with literature values finding an AAD of 0.81%. The pρT dependences of the thermal conductivity are analyzed based on the vibrational theory. The results obtained show that the higher density of biofuels leads to smaller distances between oscillating molecules, of which the collision probability and intermolecular energy transport are enhanced. The consistent behaviors of biofuels that higher density leads to higher conductivity, and the dependence of the thermal conductivity on density becomes smaller with temperature increase are verified.
研究领域:
热物理学
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燃料工程
·
动力工程
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Ying Huang,Xiaopeng Han,Tiehu Li,Xu Sun
The continuous copper thermal-diffusion network of graphite flakes (GFs), aluminum sheets (Als), and Al particles (Alp) was prepared via chemical plating methods. After the vacuum-pressure infiltration process, Cu coatings contacted with other components forming three dimensional thermal diffusion pathways. The prepared Als@Cu/Alp@Cu/GFs@Cu/Al composites exhibited high effective thermal transfer properties. Moreover, the thermal conductivity (TC) of the Als@Cu-2/Alp@Cu/GFs@Cu/Al composite showed the optimal value of 542.66 W/m·K, which was larger than the pure Al matrix about 2.30 times. In this study, the innovative preparation method could be applied to fabricate aluminum-based composites with better thermal diffusion performance.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2014
·Vol. 35
·期 8
·1450-1464
·
IF 0.623
Wang Sheng,Zhang Ying,He Mao-Gang,Zheng Xiong,Chen Li-Bin
Transport and thermodynamic properties of pentane are necessary for the design and verification of reactors in pentane isomerization and degradation processes. However, there are few experimental data of these properties, especially in the high-temperature region. In this work, the thermal diffusivity and the sound speed of pentane have measured by dynamic light scattering and Brillouin light scattering, respectively. Pentane has been investigated under saturated conditions over a wide temperature range, from about 300 K up to the liquid–vapor critical point. It is estimated that: the standard uncertainty of temperature is \(u(T) = 0.01\) K for the hydrodynamic region and \(u(T) = 0.026\) K for the critical region; the relative expanded uncertainty in the thermal diffusivity is \(U_\mathrm{r}(a) = 0.03\) and the relative expanded uncertainty in the speed of sound is \(U_\mathrm{r}(c_\mathrm{s}) = 0.005\) with a coverage factor of \(k = 2\) . The thermal diffusivity and the sound-speed experimental data are also represented as functions of temperature. Finally, the results are discussed in detail in comparison with literature results and various prediction methods.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2025
·
IF 2.7
Xin Wu,Chao Yan,Ying Hu,Junlei Tang,Xiuli Zhao,Mao Chen
Vitrimers are covalently crosslinked networks with dynamic bond exchange, where their dynamic behavior is typically regulated by adjusting network structures or incorporating fillers. This study introduces graphite flakes (GFs) into sulfur-containing. Vitrimers to investigate their effects on mechanical properties, stress relaxation, and thermal conductivity. The results demonstrate that adding 10 wt.% GFs increases tensile strength by 4.37% compared to pure epoxy vitrimer, while higher filler content reduces toughness and decelerates stress relaxation. At 160 °C, the characteristic relaxation time rises from 15.35 s (pure vitrimer) to 108.85 s (40 wt% GFs composite). The Arrhenius prefactor ( τ₀ ) decreases with GFs loading, whereas the activation energy ( E a ) remains nearly unaffected. Additionally, 40 wt.% GFs enhance thermal diffusivity by 110.17% due to oriented phonon transport channels. Chemical recycling via DTT solution achieves complete matrix degradation and filler recovery without damaging GFs. This study provided valuable insights for optimizing vitrimer composites, particularly in enhancing thermal conductivity and modulating dynamic properties.
研究领域:
材料科学
·
复合材料
·
可持续材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Xinyu Liu,Yuhang Chen,Zhao Lei,Long Cheng,Maogang He,Ying Zhang
Isooctane is an ideal gasoline component with a high octane number and low volatility. However, there is a lack of research on the thermal properties of isooctane, especially near the critical point. This work uses dynamic light scattering to measure the thermal diffusivity of isooctane in the temperature range of (298.15–583.15) K, along 8 isobaric lines p = (0.1, 2.0, 2.5, 2.7, 3.0, 3.5, 5.0, 7.5) MPa, and analyzes the trend of thermal diffusivity with temperature and pressure. The average relative combined expanded uncertainty of the thermal diffusivity is 0.0214. Meanwhile, the experimental data were compared with the calculated values from thermal conductivity, and the absolute average values of the relative deviation and maximum deviation were 2.88 and 8.22%, respectively.
研究领域:
物理化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Weilong Chen,Kun Wu,Zhencai Qu,Mangeng Lu
It has been known that phonon mean free path along polymer chains is much larger than in transverse directions because weak interaction between polymer chains leads to chain distortion and entanglement. In order to improve intensity of intermolecular interaction, a series of co-polyesters (CPE) containing different content of offset π-π stacking structure in side chains were synthesized by means of polycondensation and transesterification in this work. WAXD patterns unfolded diffraction peak at 2θ of 27.6°, standing for structure of offset π-π stacking. On enlarging intensity of offset π-π stacking interaction, specific heat capacity of CPE increased from 1.140 Jg −1 K −1 to 1.410 Jg −1 K −1 and thermal diffusivity rose from 0.194mm 2 s −1 to 0.245mm 2 s −1 . As a result, CPE sample exhibited excellent thermal conductivity (TC) of 0.381 Wm −1 K −1 , which is around twice that of traditional thermoplastics. Hence offset π-π stacking interaction could strengthen capacity of heat absorption and thermal conduction at the same time, which might be a good candidate for enhancing thermal conductivity of intrinsic polymers. Furthermore, strong π-π interaction in side chains could maintain modulus when temperature is over glass temperature. And the Young modulus grew from 0.14 GPa to 0.44 GPa with the augment of offset π-π stacking structure.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2021
·
IF 2.775
Junshuai Chen,Hongwei Xing,Taotao Zhan,Libin Chen,Maogang He,Ying Zhang
Ethanol is a common industrial substance and widely applied in technological and scientific applications, of which the thermophysical properties especially near the critical point are scarce. In this work, the thermal diffusivity of ethanol was determined by the dynamic light scattering method in the temperature ranging from (293 to 564) K and along six isobaric lines including 0.1, 2.5, 5, 6.2, 7.5 and 10 MPa. The relative uncertainty of the thermal diffusivity experimental system is estimated to be less than 2.6% for coverage factor of k = 2 with the level of confidence 0.95. The variation of thermal diffusivity with the temperature and pressure was analyzed. In addition, the comparison between the experimental data and the calculated values from thermal conductivity was made, and the absolute average of relative deviation (AARD) between them is 0.96%.
研究领域:
化学工程
·
物理学
✓ 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）