PHYSICS AND CHEMISTRY OF LIQUIDS
·
2013
·
IF 0.813
Jinshou Wang,Boan Shi,Zhen Shi,Yu Cao,Yingxuan Liu,Shenghui Zhang
We have measured the rate of saponification of ethyl acetate (CH3COOC2H5) in 2,6-lutidine (2,6-DMP) + water (H2O) near and far away from its critical point by electrical conductivity experiment. We found that the rate of saponification slowed in the one-phase region at temperatures near the critical point. This behaviour is evidence in support of critical slowing down. Moreover, the experimental results were compared with those of the same reaction in a different critical mixture of 2-butoxyethanol + H2O [Y.W. Kim, Int. J. Thermophys. 25, 1025 (2004)].
研究领域:
化学动力学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Ying Zhang,Yutian Chen,Taotao Zhan,Maogang He
The speed of sound in n-heptane was measured by the Brillouin light scattering (BLS) method. The examined region is T = (513.40 to 650.90) K along seven isobaric lines at p = (2.5, 3.0, 4.0, 5.0, 6.0, 8.0, and 10.0) MPa, which was near the critical point of n-heptane. The relative expanded uncertainty (k = 2) of BLS experimental system is estimated to be <0.013 for the speed of sound measurement. The variation tendencies of the speed of sound with increasing temperature and pressure were illustrated. Moreover, the calculated results from the multiparameter equation of state (EOS) proposed by Span and Wagner were employed to assess the experimental data in this paper. The absolute average of the deviations (AAD) between the experimental data and the calculated results is 1.22% in the whole investigated p–T region.
研究领域:
热力学
·
物理化学
✓ 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
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Ke Bei,Youyan Wang,Dan Yang,Qizhi Shao,Xiangyong Zheng,Min Zhao,I-Ming Chou,Jun Kikuchi,Zhiyan Pan
This study used a high pressure optical cell (HPOC) combined with a heating/cooling stage, a pressure device, and a laser Raman spectrometer to investigate the volume expansion (VE) of CO 2 + tetradecane and CO 2 + hexadecane mixtures under geological storage conditions. Abrupt changes in VE were observed near the CO 2 critical point (CP), which is assumed to be ubiquitous in CO 2 + long-chain alkane mixtures with ≥14 carbon alkanes. This is due to the critical anomaly of the thermodynamic behavior of the mixture near the CP of CO 2 , which inhibits the VE of CO 2 + long-chain alkanes at lower temperatures. In addition, four machine learning (ML) algorithms, including backpropagation neural network (BPNN), K-nearest neighbors (KNN), random forest (RF), and support vector regression (SVR), were applied to predict the volume expansion factor (VEF). The BPNN model provided much higher robustness and accuracy with correlation coefficient ( R 2 ) >0.98 and mean square error ( MSE ) <0.03, which indicates a strong agreement between the predicted result and matching experimental data. We concluded that a predictive framework built using ML could provide rapid predictions of the volume change curve or curved surface of CO 2 + organic mixtures under various temperature and pressure conditions.
研究领域:
地质学
·
化学工程
·
数据科学
✓ 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
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Xin Li,Taotao Zhan,Yongbo Zhang,Yuqi Su,Maogang He,Ying Zhang
As one of higher n -alkanes, n -dodecane is an important component of surrogate fuels for aviation kerosene, of which the accurate knowledge of its thermophysical properties is necessary for industrial application. The speed of sound in n -dodecane was measured by the Brillouin light scattering (BLS) in the vicinity of the critical point, of which the examined regions are T = (433.49 to 678.84) K along seven isobaric lines at p = (1.85, 2.0, 2.2, 4.0, 6.0, 8.0, and 10.0) MPa. The relative expanded uncertainty of BLS experimental system is estimated to be less than 1.2% with the confidence level of 95% (coverage factor, k = 2). Polynomial representations for the speed of sound in liquid n -dodecane was fitted by the experimental results, and the average absolute deviation and maximum absolute deviation are 0.70% and 1.96%, respectively. Moreover, the accuracy of the multiparameter equation of state proposed by Lemmon were assessed by the experimental speeds of sound in the whole investigated p - T region.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2020
·
IF 2.838
Taotao Zhan,Junshuai Chen,Xin Li,Qi Zhou,Maogang He,Ying Zhang
The speed of sound in ethanol was measured in liquid, near-critical and supercritical fluid over the temperature range from (298.52–655.67) K along five isobaric lines from (0.1–9.0) MPa from Rayleigh-Brillouin light scattering spectroscopy . The expanded relative uncertainty for the reported speed of sound is estimated to be 1.3% with the level of confidence of 0.95 (coverage factor k = 2). The correlation for experimental speeds of sound in liquid ethanol are presented, and the averaged absolute percentage deviation between the calculated values and literature data is 0.16%. The variation tendencies of the speed of sound in ethanol with increasing temperature and pressure were illustrated over the whole investigated p - T region. The accuracy of the three fundamental equations available in the NIST Standard Reference Database 23 were assessed by the experimental speeds of sound in ethanol.
研究领域:
物理化学
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2016
·Vol. 45
·期 5
·702-711
·
IF 1.256
Yang Ya,Jin Jing,Wang Jinshou,Shi Zhen,Zhang Shenghui
We have constructed the pseudoternary phase diagram of surfynol465 + n -butanol + cyclohexane + H 2 O with k
m = 2 (where k
m is the weight ratio of surfynol465 to n -butanol) by the water titration method. Electrical conductivity measurements were employed to investigate the microstructures of the single-phase region. In the oil/water microemulsion region, we have measured the hydrolysis reaction rate of 2-bromo-2-methylpropane near and far away from the critical point. It was found that the Arrhenius equation was valid for correlating experimental measurements far away from the critical point but a significant acceleration effect exists near the critical point, which is not consistent with thermodynamic interpretation of Griffiths and Wheeler.
研究领域:
化学动力学
·
胶体与界面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Lvjie Yang,Yunhui Xiang,Lin Chen,Dan Zhang,Chenyi Wu,Shenghui Zhang,Jinshou Wang,Dating Tian
The pseudoternary phase diagrams of surfynol465/ n -butanol/ n -hexane/0.006 mol/L NaOH aqueous solution with k m = 5/3 and surfynol465/ n -butanol/ n -hexane/0.006 mol/L NaOH-heavy water solution with k m = 5/3 (where k m is mass ratio of surfynol465 to n -butanol) have been constructed. In the corresponding O/W regions of these two microemulsion systems, the kinetics of the basic hydrolysis of crystal violet has been investigated near and far away from their respective critical points by using UV spectrophotometer . It was found that no critical effects were observed in these two systems. For the first reaction system, the experimental results obeyed the Griffiths-Wheeler rule; however, it was not consistent with the prediction by the Griffiths-Wheeler rule for the second reaction system. This discrepancy of theory and experiment for the second reaction system may be related to the isotope exchange of H and D. This work extended the studies of critical effect on the chemical reaction to O/W microemulsion as reaction medium.
研究领域:
物理化学
·
胶体与界面化学
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
·
IF 5.3
Shuting Lei,Yiyang Zhang,Zhu Fang,Tianyi Wu,Xing Jin,Shuiqing Li
For applications in optics, energy storage, and semiconductors etc., spherical non-aggregated particles are desired for better flowability , molding capability and homogeneous densification . Spray flame synthesis has attracted widespread attention with its excellent ability for atomic-level mixing/doping and good potential for scale-up production. However, spray flame synthesis usually produces aggregates due to the known collision-coalescence growth. In this paper, we propose a two-step strategy of suspension-fed spray-flame synthesis. The first step involves the synthesis of aggregated nanoparticles , followed by a second step where these aggregates are reconstructed into spherical non-aggregated particles while retaining the advantage of atomic-level homogeneous mixing. It is found that for aggregated Y 2 O 3 nanoparticles , the critical point for reconstructing into spherical particles occurs when the flame temperature exceeds the melting point. The spherical particle size increases with the solid concentration of the suspension by a power of about 0.28. Assuming that droplets do not undergo micro-explosions and instead follow a one droplet to one particle route results in an overestimation of particle size by a factor of 6 to 8. This discrepancy suggests that micro-explosions may play certain role in the new suspension-fed flame synthesis, and largely reduces the final particle size. Furthermore, the Al 2 O 3 -Y 2 O 3 and MgO-Y 2 O 3 particles are selected for the multicomponent suspension-fed synthesis, representing the miscible and immiscible systems, respectively. The results show that for the Al 2 O 3 -Y 2 O 3 system, uniformly mixed spherical non-aggregated particles are obtained. For the MgO-Y 2 O 3 system, both composite spherical particles with pinning structure and MgO nanoparticles are identified, indicating that for obtaining spherical multi-component non-aggregated particles, the flame temperature needs to be higher than not only the eutectic component's melting point but also any single component's melting point. Overall, suspension-fed spray flame synthesis opens up a new pathway for the low-cost industrial-scale production of spherical non-aggregated multi-component particles.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2023
·
IF 13.2
Zhigao Zhu,Xiangyang Xue,Minjie Song,Junwen Qi,Yujun Zhou,Yue Yang,Jiansheng Li
Membrane distillation (MD) is a critical technique for achieving near-zero discharge of hypersaline wastewater. However, it often faces challenges due to frequent mineral scale accumulation on the membrane surface and within its pores, particularly during the later stages of concentration, which compromises the membrane's lifespan and sustainability. This study explores the effects of implementing scaling control using micro–nano structured superhydrophobic nanofibrous membranes for concentrating reverse osmosis seawater concentrate and simultaneously aims to identify the membrane concentrating critical point (MCCP), a vital threshold that precedes irreversible scaling, to enhance sustainable desalination . Our findings show that the micro-nanostructures on the superhydrophobic membrane surface significantly reduce salt nucleation on the membrane surface and within the membrane pores, effectively extended the membrane MCCP for stable membrane flux, water recovery and reusability. Moreover, the membrane service life can be substantially extended by halting the concentration process before salt crystals embed into the membrane pores. This research highlights the critical role of these two control factors in augmenting membrane service life, offering valuable theoretical and practical insights for MD applications in hypersaline wastewater treatment.
研究领域:
环境工程
·
水处理
·
海水淡化技术
·
膜科学
✓ 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）