FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Ying Zhang,Xiong Zheng,Maogang He,Yutian Chen
The thermal diffusivity and the speed of sound in dibutyl ether (DBE) were measured using light scattering method, including saturated liquid/vapor and supercritical region. The expanded relative uncertainty ( k = 2) of the thermal diffusivity and the speed of sound was estimated to be less than 2% and 0.5% over the whole investigated range of states. Polynomial representations for the thermal diffusivity and the speed of sound were fitted to the data in saturated liquid/vapor. For the thermal diffusivity, the AAD is 0.50% for the saturated liquid and 0.67% for the saturated vapor . For the speed of sound, the AAD is 0.41% for the saturated liquid and 0.35% for the saturated vapor. The tendency of the thermal diffusivity and the speed of sound to temperature and pressure in supercritical region are also analyzed.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 8
·1547-1552
·
IF 3.879
Yang Huang,Zanyong Zhuang,Xiaogang Xue,Jinsheng Zheng,Zhang Lin
So far, the photoluminescence (PL) properties optimization of mercaptopropionic acid (MPA) capped CdTe has yet to be understood from a perspective of growth kinetics. In this work, the growth kinetics, size distribution and PL properties of CdTe quantum dots (QDs) grown in MPA aqueous solutions of two extreme concentrations, i.e. 0 mM and 50 mM, were systematically investigated. The studies revealed that CdTe QDs coarsen in low and high concentrations of MPA followed different growth kinetics, i.e. a mixed OA (Oriented Attachment)–OR (Ostwald Ripening) growth and an OA dominated growth, respectively. Moreover, the OR growth in a low MPA concentration solution was found to be disadvantageous for narrowing the size distribution but favourable for enhancing fluorescence, while the OA growth in a high MPA concentration solution is beneficial for focusing and controlling the particle size. Further activation energy calculations indicate that the extra MPA that forbids the OR growth and retards the OA growth is favourable for slowing the particle growth, thus achieving CdTe QDs with a controlled size and narrow distribution. Furthermore, the kinetics study reveals how the introduction of concentrated surface ligands affects the PL properties (FWHM and intensity) of the material.
研究领域:
材料科学
·
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
Theranostics
·
2021
·
IF 11.556
Yuce Li,Yuchen Lou,Yu Chen,Jing Yang,Danqi Li,Biling Jiang,Jiajia Lan,Jingjing Wen,Yangxue Fu,Yamin Zhang,Juan Tao,Jintao Zhu
Immune-mediated inflammatory diseases (IMIDs) are characterized by immune dysregulation and severe inflammation caused by the aberrant and overactive host immunological response. Mycophenolic acid (MPA)-based immunosuppressive drugs are potential treatments for IMIDs because of their mild side-effect profile; however, their therapeutic effects are limited by the high albumin binding rate, unsatisfactory pharmacokinetics, and undefined cellular uptake selectivity. Methods: Polysaccharide mycophenolate was synthesized by conjugating MPA molecules to dextran (a typical polysaccharide widely used in drug delivery) and encapsulated extra free MPA molecules to fabricate MPA@Dex-MPA nanoparticles (NPs). The efficacy of these NPs for mediating immunosuppression and treatment of IMIDs was evaluated in imiquimod-induced psoriasis-like skin inflammation in Balb/c mice, a representative IMID model. Results: The MPA@Dex-MPA NPs exhibited high MPA loading efficiency, low albumin binding rates, and sustained MPA release, resulting in improved pharmacokinetics in vivo . Compared to free MPA, MPA@Dex-MPA NPs induced more robust therapeutic effects on IMIDs. Mechanistic studies indicated that MPA@Dex-MPA NPs were primarily distributed in dendritic cells (DCs) and significantly suppressed the overactivated DCs in vivo and in vitro . Furthermore, the recovered DCs rehabilitated the IL-23/Th17 axis function and significantly ameliorated imiquimod-induced psoriasis-like skin inflammation. Importantly, MPA@Dex-MPA NPs showed favorable safety and biocompatibility in vivo . Conclusion: Our results indicated the polysaccharide mycophenolate-based NPs to be highly promising for IMID treatment.
研究领域:
药学
·
免疫学
·
纳米技术
·
炎症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Jian Yang,Xianyang Meng,Jiangtao Wu
As the important industrial raw materials, n-pentene, n-hexene, and n-heptene are widely used as gasoline additives to improve the combustion characteristics of gasoline and polymerized monomer to synthesize many important polymer compounds. Therefore, reliable density data are significant for these fluids to apply in industry. In this work, new experimental densities of n-pentene, n-hexene, and n-heptene have been measured at pressures up to 100 MPa along nine isotherms between 283 and 363 K by using a high pressure vibrating-tube densimeter. The experimental system was calibrated using water and a vacuum and was tested with R134a over the entire temperature and pressure ranges. The combined expanded uncertainties of the temperature, pressure, and density with a level of confidence of 0.95 (k = 2) are estimated to be 16 mK, 0.062 MPa (p ≤ 60 MPa), 0.192 MPa (60 MPa < p < 100 MPa), and up to 0.6 kg·m–3 depending on the temperature and pressure ranges. The density data were correlated with the Tait-like equation, and the average absolute deviations are 0.06, 0.04, and 0.05%. Furthermore, the isothermal compressibility and the isobaric thermal expansivity were derived from the Tait-like equation over the experimental temperature and pressure ranges.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Hongwei Xing,Junshuai Chen,Yongbo Zhang,Libin Chen,Maogang He,Ying Zhang
Transport properties of n-pentane are so scarce that it prevents the further studies of n-pentane as an important component of industrial fluids, especially in the near-critical and supercritical regions. In this work, the thermal diffusivity of n-pentane was measured by the dynamic light scattering method within the temperature limits of (293–573) K along six isobaric lines at p = (0.1, 3.0, 3.5, 5.0, 7.5, and 10.0) MPa. The relative uncertainty of the thermal diffusivity experimental system is estimated to be 2.6% for a coverage factor of k = 2 with a level of confidence of 0.95. The influences of temperature and pressure on thermal diffusivity were presented. Besides, we compared the experimental data with the calculated values from the thermal conductivity model proposed by Vassiliou et al. and the multiparameter equation of state proposed by Span and Wagner. The absolute average of relative deviation and maximum deviation between the experimental data and the calculated results are 1.12 and 3.74%, respectively.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Chenyang Wen,Xianyang Meng,Kaixin Wei,Jiangtao Wu
The compressed liquid viscosities of 2-methylpentane, 3-methylpentane, and 2,3-dimethylbutane were measured using a vibrating-wire viscometer over the temperature range of (273 to 343) K and at pressures up to 40 MPa. The combined expanded uncertainty of the reported viscosity is about 2% with a confidence level of 0.95 (k = 2). An empirical Andrade–Tait equation was used to correlate the viscosity as a function of temperature and pressure with average absolute percentage deviations of 0.19%, 0.23%, and 0.25%, respectively.
研究领域:
化学工程
·
物理化学
✓ 已验证
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
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.4
Yuhang Chen,Long Cheng,Zhao Lei,Yuqi Su,Maogang He,Ying Zhang
Transport properties, including thermal diffusivity and the Fick diffusion coefficient, are key parameters for optimizing chemical processes and ensuring production safety. In this work, the thermal diffusivity and Fick diffusion coefficient of the n–heptane + n–decane binary mixture were measured by dynamic light scattering at n–heptane amount fractions from 0.25 to 0.75. Measurements were performed along five isobars at 0.1, 2.5, 5.0, 7.5, and 10 MPa. Thermal diffusivity was determined over 298.15–523.15 K, except at 0.1 MPa, where the temperature range was limited to 298.15–373.15 K, while Fick diffusion coefficients were obtained from 298.15 to 373.15 K. The relative expanded uncertainties in thermal diffusivity and Fick diffusion coefficient were estimated to be 0.094 and 0.146, respectively, at a confidence level of 0.95 (k = 2). The effects of temperature, pressure, and composition on thermal diffusivity and Fick diffusion coefficient were analyzed, aiming to offer guidance for optimizing the design of industrial processes and ensuring operational safety and reliability.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yuanming Fu,Xianyang Meng,Ximei Liang,Jiangtao Wu
The density and viscosity of liquid 1-dodecanol and 1,12-dodecanediol were reported, which were obtained simultaneously by using a vibrating-wire viscometer. The measurements were determined at temperatures from 298.15 to 573.15 K for 1-dodecanol and 373.15 to 573.15 K for 1,12-dodecanediol and at pressures from 0.1 to 10 MPa. The combined expanded uncertainties (k = 2) of the reported data for density and viscosity were estimated to be 0.26% and 2.1%, respectively. The density and viscosity data obtained in this work were correlated with the Tait-type equation and Andrade–Tait equation, respectively. The average absolute percentage deviation of the density data from the correlations were 0.08% for 1-dodecanol and 0.06% for 1,12-dodecanediol, and the average absolute percentage deviation of the viscosity data from the correlations were 0.64% for 1-dodecanol and 0.67% for 1,12-dodecanediol. The correlations were also used to compare the present results with the available literature data. An acceptable agreement between the present results and the literature data was observed. Finally, the derived properties of isobaric expansibility and isothermal compressibility were derived based on the Tait-type equation of this work.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Xiong Zheng,Ying Zhang,Maogang He
The speed of sound in hexane and heptane (mass purity > 0.990, GC) was measured using the Brillouin light scattering method at T = (300.15 to 506.15) K for hexane, (302.15 to 536.15) K for heptane), and p = (1.0 to 8.5) MPa, including saturated liquid, saturated vapor, and compressed liquid. The expanded relative uncertainty (k = 2) of the speed of sound was estimated to be less than 1.0% over the whole investigated range of states. Polynomial representations for the speed of sound in hexane and heptane were fitted to the experimental results. A comparison of the speed of sound data with the correlation shows that, for hexane, the AAD is 0.67% for the saturated liquid, 0.36% for the saturated vapor and 0.57% for the compressed liquid respectively, and for heptane, the AAD is 0.46% for the saturated liquid, 0.38% for the saturated vapor and 0.41% for the compressed liquid, respectively.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Tao Zhang,Liwei Zhuang,Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma
The solubilities of salts, refractive indices, and pH values of the equilibrium liquid phases in the quaternary system LiCl–LiBO2–Li2B4O7–H2O at 323.15 K were investigated by the isothermal dissolution method for the first time. The dry-salt diagram of the quaternary system consisted of one invariant point, three univariant curves and three crystallization fields corresponding to LiCl·H2O, LiBO2·2H2O, and Li2B4O7·3H2O. The solution refractive indices and pH values change regularly with the changing of concentration. Combining the equilibrium constants for different boron species, the distributions of six boron species in the mixed solution in the systems LiCl–LiBO2–H2O, LiBO2–Li2B4O7–H2O, and LiCl–Li2B4O7–LiBO2–H2O were calculated with the total boron concentration and pH values. The main boron species in the mixed solution of the quaternary system are B3O3(OH)4–, B4O5(OH)42–, B(OH)3, and B5O6(OH)4–. The boron species distributions are mainly affected by the pH values and the concentration of total boron and LiCl in the solution. The results of phase diagram and boron species distribution in the quaternary system can supply foundation data for separating lithium borate from brines.
研究领域:
化学
·
材料科学
✓ 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）