JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Ying Zhang,Songtao Cao,Yuqi Su,Maogang He
The mutual diffusion coefficients of ethanol + isooctane and n- butanol + isooctane mixtures were measured by digital holographic interferometry. The measurements were performed at atmospheric pressure with temperatures ranging from 288.15 K to 318.15 K and mass fractions ranging from 0.05 to 0.95, and the effects of changes in temperature and composition were discussed. Based on the local composition theory, a new model is proposed for predicting mutual diffusion coefficients. Modified from the Vignes model, this model can be used to predict the mutual diffusion coefficient in ideal or non-ideal mixtures within a given deviation range. A comparison of the prediction results for the new model and five other models shows that the new model is far superior to the Darken model and Vignes model, and also has some advantages over the other models.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
·
IF 2.888
Taotao Zhan,Yuqi Su,Ying Zhang,Xiangyang Liu,Maogang He
The mutual diffusion coefficients of ethanol + n-heptane and diethyl carbonate (DEC) + n-heptane binary solutions were measured over the mass fraction from 0.05 to 0.95 at the pressure of 0.101 MPa, and at temperatures T = 288.15 K, 298.15 K, 308.15 K and 318.15 K. The expanded relative uncertainty ( k = 2) of the Mach-Zehnder digital holographic interferometry employed in the measurements was estimated to be less than 2.4% with the confidence level of 0.95. A semi-empirical correlation was used to fit the mutual diffusion coefficients as a function of concentration and temperature, which represents the experimental values with the absolute average relative deviations being 0.94% for ethanol + n-heptane and 0.90% for DEC + n-heptane. The temperature and concentration dependences of the mutual diffusion coefficients were investigated. The strongest non-ideal thermodynamic behaviors appear when the mass fraction of ethanol is within the limits of 0.45 to 0.65 or that of DEC is within the limits of 0.45 to 0.65. Besides, the mutual diffusion coefficients of ethanol + n-heptane and DEC + n-heptane binary solutions are found to be extremely sensitive to the solute concentration over the mass fraction of ethanol and DEC from 0.00 to 0.05, respectively.
研究领域:
物理化学
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热力学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2020
·
IF 2.838
Junwei Cui,Shaomin Yan,Jiangtao Wu,Shengshan Bi
In this work, thermal and mutual diffusivity of n -heptane ( n -C 7 H 16 ) with dissolved carbon dioxide (CO 2 ) were simultaneously measured using dynamic light scattering (DLS) method from 298 to 473 K and saturation pressure up to 5.5 MPa. For this purpose, the DLS setup as well as temperature and pressure system were improved. Two hydrodynamic modes in connection with the statistical fluctuations of entropy and species were verified. The average expanded uncertainty of thermal and mutual diffusivity were 9.0% and 4.9% with a coverage factor of k = 2. The thermal and mutual diffusivity versus pressure under isothermal lines were briefly discussed and a comparison with literature was performed. The experimental thermal and mutual diffusivity measured in this work are in reasonable agreement with the literature data. This work is expected to provide fundamental data for engineering process .
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Yuqi Su,Songtao Cao,Taotao Zhan,Maogang He,Ying Zhang
The mutual diffusion coefficients of dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary systems were measured at temperatures from 288.15 K to 318.15 K with the mass fraction of dimethyl carbonate from 0.05 to 0.95 under atmospheric pressure. All the mutual diffusion coefficients we reported are Fick diffusion coefficients, which were measured by the digital holographic interferometry. The expanded relative uncertainty for the measured mutual diffusion coefficients is estimated to 2.4% with the level of confidence of 0.95 (coverage factor k = 2). Moreover, a theoretical model (UNIDIF) of mutual diffusion coefficients for dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary mixtures was given by fitting the experimental results, and the adjustable parameters and infinite dilution diffusion coefficients of these two solutions were given. The influences of temperature and composition on the mutual diffusion coefficients were discussed.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2021
·
IF 2.775
Junwei Cui,Jiangtao Wu,Shengshan Bi
Systems in connection with hydrocarbons with dissolved carbon dioxide (CO 2 ) are widespread in various chemical and engineering applications such as Fischer–Tropsch (FT) synthesizes, carbon capture and storage (CCS) and enhanced oil recovery (EOR). The thermophysical properties are necessary for understanding and designing those relevant processes. In this work, the liquid viscosity, interfacial tension, thermal diffusivity and mutual diffusivity of n -tetradecane with dissolved CO 2 were investigated under macroscopic equilibrium from 323 to 473 K and over a pressure range up to 5.6 MPa. With a careful evaluation of the uncertainty, the average expanded uncertainty of liquid viscosity, surface tension, thermal diffusivity and mutual diffusivity was 2.9%, 2.4%, 11.4% and 4.4%, respectively. The liquid viscosity and interfacial tension decline when the pressure of the system or the mole fraction of CO 2 in the liquid phase increases. Empirical correlations were used to represent the liquid viscosity and interfacial tension with an absolute average deviation (AAD) of 2.8% and 0.2 mN · m − 1 . A comparison of available liquid viscosity and interfacial tension from the literature were performed. In the overlapped temperature and pressure region, good agreement can be found. In terms of the thermal diffusivity, there is no obvious dependency on pressure. The mutual diffusivity decreases with pressure at 323 K, while the decline behavior cannot be observed above 323 K when taking the combined uncertainty into consideration. This work was expected to provide reliable and accurate fundamental thermophysical properties of liquid with dissolved gas systems in engineering and chemical processes.
研究领域:
化学工程
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石油工程
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热物理性质研究
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2017
·
IF 2.726
Ying Zhang,Xinxin He,Yutian Chen,Maogang He
The mutual diffusion coefficients of n -butanol + n -heptane and n -pentanol + n -heptane were measured over the mass fraction of n -butanol or n -pentanol from 0.05 to 0.95 at intervals of 0.10 and the temperatures 288.15 K, 298.15 K, 308.15 K and 318.15 K at 0.101 MPa. The measurements were carried out using a digital holographic interferometry system. The expanded relative uncertainty of the mutual diffusion coefficients was estimated to be less than 2.4%. The influences of temperature and composition on the mutual diffusion coefficients were investigated. Moreover, equations for the mutual diffusion coefficients of the two binary mixtures were fitted to the data as functions of mass fraction and temperature. The correlations represent the data with the absolute average of relative deviations (AARDs) of 1.1% for n -butanol + n -heptane and 0.77% for n -pentanol + n -heptane, respectively.
研究领域:
物理化学
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热力学
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传递现象
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溶液化学
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流体混合物
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
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2015
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IF 2.184
Sanguo Peng,Shi Zhang,Ying Zhang,Xiangyang Liu,Maogang He
Mutual diffusion coefficients of several short chain alcohols (ethanol, n -propanol and n -butanol) + n -octane mixtures in the temperature range from 283.2 K to 313.2 K at different concentrations were measured using holographic interferometry. The relation between the mutual diffusion coefficient with temperature, viscosity, concentration and molecular weight is investigated, respectively. The Onsager–Fuoss model is applied to analyse the various influence factors. A new correlation taking into account the effect of the temperature and concentration on the mutual diffusion coefficient is proposed to fit well the experimental data.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2023
·
IF 2.6
Weijie Jia,Yuqi Su,Songtao Cao,Ao Dong,Ying Zhang,Maogang He
Mutual diffusion coefficients of three alkanes (n-heptane, n-octane and isooctane) in cyclohexane were measured by digital holographic interferometry under atmospheric pressure. The measured temperature points were 288.15 K, 298.15 K and 308.15 K, respectively and the mass fraction of the measured solution range was from 0.05 to 0.95. The extended relative uncertainty of the measurement system was estimated to be less than 2.4%. The dependence of mutual diffusion coefficient on temperature and solution concentration was studied. The mutual diffusion coefficients of these three binary mixtures increase with the increase of temperature and have a nearly linear relationship with the solution concentration. And the image processing process of holographic interference image is introduced in detail. Zhang et al .’s model, Darken model and Vignes model were used to predict the mutual diffusion coefficients of the three binary mixtures, the absolute average of relative deviations (AARDs) are 2.97%, 3.89% and 6.18%, respectively and Zhang et al .’s model is the one with the best agreement among the three models.
研究领域:
化学工程
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物理化学
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热力学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 19
·4497-4507
·
IF 7
Chenglin Wang,Zuolin Zhang,Xuefan Zhao,Yunfei Zhu,Mengjia Li,Jike Ding,Cong Chen
The sequential deposition route is widely investigated in fabricating perovskite thin films for state-of-the-art perovskite photovoltaics. However, concerns such as lower morphological control, phase purity, and remnant unreacted salts such as methylammonium iodide (MAI) and PbI2 are raised, which can significantly deteriorate the optoelectronic properties and hence the operational durability of the devices. In this work, we developed a new interdiffusion-controlled nucleation (ICN) strategy by introducing sulfamic acid agents to improve the sequential deposition of perovskite crystals, achieving low defect density and high-quality perovskite films. Precisely, the ICN strategy can be used to tune the dense PbI2 films into a porous morphology, which promoted the adequate conversion of perovskite and reduced the residual PbI2. Owing to the enhanced crystallization of the perovskite films and passivated surface defects, we obtained a summit PCE exceeding 23% for perovskite solar cells and achieved responsivity values of up to 0.49 A W−1 with linear dynamic ranges of up to 136.75 dB for perovskite photodetectors. The ICN strategy provides a simple and effective way to improve the performance of perovskite-based photovoltaic devices.
研究领域:
材料科学
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光伏技术
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半导体物理
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Sijie Liu,Renda Wang,Ping Yu,Kun Liang,Li Wang,Mengyu Gao,Yang Si,Chuang Zhu,Fangfang Ge,Bingsheng Li
In this study, molybdenum (Mo) coatings were deposited on 304 stainless steel (304SS) plates using magnetron sputtering. Subsequently, the samples were annealed at 800 °C under vacuum for varying durations to enhance adhesion strength and thermal stability. Immersion tests were conducted at 700 °C for up to 800 h. After 200 h of immersion, the weight loss of the annealed Mo-coated 304SS was significantly reduced from approximately 11 mg/cm 2 to about 0.44 mg/cm 2 . The Mo-enriched layer effectively suppressed the outward diffusion of alloy elements and facilitated the formation of Cr 2 O 3 by trapping Cr in the interdiffusion layer. Additionally, the Mo 3 Fe 3 O phase formed on the coating surface via diffusion reaction exhibited certain corrosion-resistant properties. Obvious interfaces emerged within the interdiffusion layer, and their formation mechanisms were analyzed. After four thermal cycles (with a 200-h interval), partial delamination of the Mo-enriched layer in the annealed Mo-coated 304SS was observed. This may have resulted from the substantial growth stress of Cr 2 O 3 and the significant mismatch in thermal expansion coefficient between Mo coating and 304SS.
研究领域:
材料科学
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腐蚀工程
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表面工程
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可再生能源
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冶金学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 41
·6565-6572
·
IF 3.304
Jiani Gu,Yi Xie,Wenhui Chen,Chao Hu,Fen Qiao,Zhiyuan Xu,Xiaoqing Liu,Xiujian Zhao,Gaoke Zhang
We report inter-diffusion of as-synthesized covellite CuS nanocrystals (NCs) with Cu2+ cations at room temperature in the presence of a mild reducing agent (i.e., ascorbic acid). Unlike the previously-reported incorporation of Cu+ or Cu2+ ions with CuS that generates homogenous Cu2−xS NCs, the controlled diffusion of Cu2+ ions into the CuS NCs allows the formation of a unique CuS@Cu2−xS core–shell-like nanostructure as the intermediate and Cu2S NCs in the presence of excess Cu2+ ions. The CuS@Cu2−xS core–shell nanostructure can evolve into homogenous Cu2−xS NCs by further cation diffusion from the Cu2−xS shell toward the center (i.e. the CuS core) under E-beam irradiation during TEM test or when the core–shell NCs are stored in toluene for some time (e.g. four weeks). Notably, the CuS/paraffin composite with filler loading of 50 wt% and thickness of 1.95 mm displays a minimum reflection loss (RL) of −54.84 dB at 12.6 GHz. By adjusting the thickness in the range of 1–5 mm, the effective absorption bandwidth (below −10 dB, 90% microwave absorption) could reach 15 GHz (3–18 GHz). In particular, the diffusion of Cu2+ into CuS NCs leads to dampening of the NIR plasmon absorbance and a decrease in free carrier (i.e., hole) density and conductivity, which accounts for the confinement effect on the microwave absorption properties of the resulting samples.
研究领域:
材料科学
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纳米技术
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电磁材料
✓ 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）