Arabian Journal of Chemistry
·
2018
·
IF 2.969
Dashuang Fan,Zhiguo Hao,Peizhu Zheng,Jihua Zhao,Weiguo Shen
The influence of water-soluble polyethylene glycols PEG200 on the properties of sodium bis(2-ethylhexyl)-sulfosuccinate (AOT) water-in-isooctane microemulsions has been investigated by conductivity measurement and isothermal titration microcalorimetry (ITC). The percolation temperatures ( T p ), the thermodynamic properties of droplet aggregation and the interaction enthalpy (−Δ H φ ) between droplets for AOT/water/PEG200/isooctane with different PEG concentrations and a fixed molar ratio of water to surfactant ω = 22.2 were determined. Based on a two-stage thermodynamic approach of the percolation, we obtained the fusion enthalpy (Δ H f 0 ) of the close contact droplets by a combination of the droplet aggregation enthalpy (Δ H ag 0 ) and −Δ H φ . It was found that both (−Δ H φ ) and (Δ H f 0 ) varied with the concentration of PEG200 ( c PEG ) and had the extreme value at c PEG = 25 g L −1 . This phenomenon was interpreted by the variation of interface rigidity due to the varied distributions of added PEG200 between the water pool and the surfactant interface.
研究领域:
胶体化学
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物理化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2018
·
IF 4.513
Pengshuai Zhang,Rui Zhao,Chi Zhang,Yameng Wan,Tao Li,Baozeng Ren
The solubility of cyromazine in three binary solvent mixtures (acetic acid + water, propanoic acid + water, ethylene glycol + water) were measured by a gravimetric method from 278.15 K to 333.15 K under atmospheric pressure. The experimental results reveal that the mole fraction solubility of cyromazine increased with the increase of temperature in the three solvents. The Apelblat equation, the λh equation, the general single model ( GSM ) equation and the modified Jouyban-Acree model equation were all applied to correlate the experimental solubility of cyromazine well. Moreover, the dissolution thermodynamic properties: Δ sol H 0 (the apparent standard enthalpy change), Δ sol S 0 (the apparent standard entropy change), Δ sol G 0 (the apparent standard Gibbs energy change), ζ H (relative contribution of enthalpy) and ζ TS (relative contribution of entropy) of the dissolution of cyromazine in the selected solvents were calculated. The positive values of Δ sol H 0 , Δ sol G 0 , ζ H ≥ 0.5984 and ζ TS ≤ 0.4016 indicated that the dissolution of cyromazine in the three binary solvents was enthalpy-driving and endothermic process. The experimental solubility of cyromazine in this work can provide good guidance and fundamental data for the crystallization, purification and application of cyromazine.
研究领域:
化学工程
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药物化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Wentao Wang,Xiaoqiao Fan,Jinjing Qiu,Malik Muhammad Umair,Benzhi Ju,Shufen Zhang,Bingtao Tang
Temperature regulation of magnetic thermotherapy used for the treatment of diseases needs to be precise and accurately controllable. Substantial efforts have been focused recently on manipulating the parameters of alternating magnetic field (AMF) and developing nanoparticles with low Curie temperatures for a desired thermotherapy temperature. Herein, a simple and effective approach for temperature control in magnetic thermotherapy through phase transition is reported. In general, extracorporeal magnetic thermotherapy materials are synthesized by introducing superparamagnetic nanoparticles in a phase change material with high phase transition enthalpy in the thermotherapy temperature range of 41 °C–47 °C. Given the magnetothermal effect of superparamagnetic nanoparticles and temperature control characteristics by phase transition of a phase change material, the temperature of the material in AMF can be self-regulated in the thermotherapy range. Moreover, the materials exhibit excellent thermal stability, form-stable properties, and outstanding reproducibility in temperature control for repeated use. This novel strategy may open a promising avenue for the study of temperature self-controlled thermotherapy.
研究领域:
医学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2013
·
IF 2.297
Ning Li,Yan-Ling Xing,Zhi-Hong Liu
Two pure mixed alkali metal borates with Non-Linear Optical (NLO) properties, Li 6 Rb 5 B 11 O 22 and Li 4 Cs 3 B 7 O 14 , have been synthesized by a high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of Li 6 Rb 5 B 11 O 22 and Li 4 Cs 3 B 7 O 14 in 1 mol · dm −3 HCl (aq), and of LiCl·H 2 O(s) in (1 mol · dm −3 HCl + H 3 BO 3 + RbCl/CsCl) (aq) have been determined by microcalorimeter at T = 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl (aq), together with the use of the standard molar enthalpies of formation for LiCl·H 2 O(s), RbCl(s)/CsCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of −(11173.1 ± 9.5) kJ · mol −1 for Li 6 Rb 5 B 11 O 22 and −(7145.1 ± 5.9) kJ · mol −1 for Li 4 Cs 3 B 7 O 14 were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
化学
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材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2013
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IF 2.206
Jie Ren,Linbo Wu,Bo-Geng Li
Simple solutions of alkali metal salts of 1,2,4-triazole (TrizM) in polyethyelene glycol (PEG) and dimethylsulfoxide (DMSO) were prepared and assessed for CO2 capture. These aprotic heterocyclic anions (AHAs) containing solutions exhibit excellent CO2 capture performances. The TrizM salts absorb CO2 chemically in a 1:1 stoichiometry. What is more attractive is that the CO2 chemical absorption enthalpies are as low as −33 ∼ −21 kJ mol–1, close to that of physical absorption by traditional ionic liquids (ILs). This makes regeneration of the absorbents highly energy-saving. The TrizM-PEG solution has a steady CO2 capture performance due to the nonvolatility of PEG, and therefore, it is durable for CO2 capture. In comparison, the TrizM-DMSO solution has a higher absorption capacity (120 mg/g solution) because of the higher solubility of TrizM. Such simple and inexpensive solutions show new potential as promising candidates for highly efficient, energy-saving, and economical CO2 catchers.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 69
·期 1
·e17894
·
IF 4.167
Bingwen Long,Keke Yao,Shijie Zhu,ZuHong Li,Tong Li,Fuli Deng,Hua Deng,Yigang Ding
A thermodynamic and kinetic study of the dissolution properties of urea phosphate (UP) in water is performed using a Calvet type microcalorimeter. Calorimetric measurements reveal the dissolution is endothermic and the heat is perfectly proportional to the amount of UP dissolved, yielding an enthalpy of (33.755 ± 0.65) kJ/mol. By combining the enthalpy data of our measurements and literature, we derive the enthalpies of urea-phosphoric acid adduct reaction, formation of solid UP and UP dissociation. Dissolution kinetics parameters are estimated using the collected dynamic calorimetric data that are well represented with quasi-second-order kinetic model, giving an activation energy of (16.7 ± 2.7) kJ/mol. Thermodynamic modeling of the pH difference between UP and phosphoric acid solutions shows the degree of UP dissociation decreases from 74% to 42% when UP molality increases from 0.02 to 1 mol/kg. Furthermore, the species molality distributions in UP solutions are calculated based on mass balance and the dissociation equilibrium relations considered.
研究领域:
物理化学
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热力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Chenxiao Yin,Zhi-Xiong Fei,Jingrui Sun,Lin Weng,Xu Wang,Ke-Ke Yang,Ling-Ying Shi
Low-temperature solid–liquid organic phase change materials (OPCMs) offer tremendous opportunities in thermal management techniques but suffer from leakage problems above the melting temperature. Here, inspired with the universal hydro/organogels using three-dimensional polymer networks capable of holding large amounts of liquid solvents, a kind of form-stable high-enthalpy biphasic phase change organogels (BPCOGs) were developed by the integration of hydrophobic association for synthesizing intrinsic phase change matrices and H-bonding interaction for binding OPCM liquids. The porous phase separated poly(acrylamide-octadecyl acrylate) (P(AM- co -OA)) matrices with uniformly dispersed thermal conductive carbon nanotubes were fabricated from the hydrophobically associating hydrogels (HAHs), in which POA segments provide the phase change energy storage microdomains and the PAM network is capable of binding a series of melted OPCMs by hydrogen bond engineering. The fabricated BPCOGs possess form-stability, high phase change enthalpy (high up to 215.5 J g −1 ) and high energy storage efficiency (>90%), and show excellent electrical/optical-thermal energy conversion as well as shape memory performances. This study provides a universal strategy to prepare flexible biphasic OPCMs suitable for a variety of solid–liquid OPCMs including fatty alcohols, fatty acids and polyethylene glycol, and demonstrates the great potentials of these BPCOGs in solar energy utilization and functional flexible devices.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
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2013
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IF 1.989
Ning Li,Rui-Bin Zhang,Zhi-Hong Liu
Two pure mixed alkali/alkaline earth metal borates with three-dimensional framework, LiBaB 9 O 15 and NaBaB 9 O 15 , have been synthesized by high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA–TG techniques and chemical analysis. The molar enthalpies of solution of LiBaB 9 O 15 and NaBaB 9 O 15 in 1 mol L −1 HCl(aq), and of LiCl·H 2 O(s)/NaCl(s) in [1 mol L −1 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O](aq) have been determined by microcalorimeter at 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol L −1 HCl (aq), together with the use of the standard molar enthalpies of formation for Ba(OH) 2 ·8H 2 O(s), LiCl·H 2 O(s)/NaCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of −(6796.8 ± 7.3) kJ mol −1 for LiBaB 9 O 15 and −(6829.9 ± 7.3) kJ mol −1 for NaBaB 9 O 15 were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Pan Liang,Jie Wang,Zhi-Hong Liu
A pure zinc borate, Zn[B 12 O 14 (OH) 10 ], has been synthesized and characterized by XRD, FT-IR, simultaneous TG-DTA techniques, and chemical analysis. The molar enthalpy of solution of Zn[B 12 O 14 (OH) 10 ] (s) in 1 mol·dm −3 HCl(aq) was measured by microcalorimeter at T = 298.15 K. The molar enthalpy of solution of ZnO(s) in the mixture solvent of 2.00 cm 3 of 1 mol·dm −3 HCl(aq) and calculated amount of H 3 BO 3 was also measured. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol·dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for ZnO(s), H 3 BO 3 (s), and H 2 O(l), the standard molar enthalpy of formation of −(9646.6 ± 9.6) kJ·mol −1 at T = 298.15 K was obtained on the basis of an appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −9492.7 kJ·mol −1 for [B 12 O 14 (OH) 10 ] 2− has also been estimated by a group contribution method, which has been used to predict the Δ f H m θ of a series of transition metal borates of M[B 12 O 14 (OH) 10 ] (M II = Mn, Zn, Fe, Co, Ni). These estimated data have been used to further compare the stability of this series of transition metal borates.
研究领域:
无机化学
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物理化学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Yingjie Hou,Feng Ma,Zhen Fu,Jiasheng Dai,Yujie Tang,An Qiang,Xinye Jiang,Zheng Wang
Cost and thermal stability are critical for the application of low-temperature phase change materials (PCMs) in asphalt pavements. Aliphatic eutectic phase change materials (AEPCMs) are expected to be potential candidates for new low-temperature PCMs. The objective of this study was to develop a set of low-temperature AEPCMs with a phase transition temperature of − 3.58 to 16.21 °C and a latent heat of 144.01 to 195.96 J/g in an attempt to replace tetradecane (TD). To fully evaluate the properties of low-temperature AEPCMs and TD, and the impacts of their direct incorporation into asphalt, the chemical structures , enthalpies, mass retention, economic costs, and changes in the physical and rheological properties of the modified asphalt were investigated. The results showed that AEPCMs with a phase transition temperature similar to that of TD could be obtained by eutectic crystallization and retained the chemical properties of their components. However, the latent heat decreased progressively with the increase in the number of components. The AEPCMs exhibited higher thermal stability than TD, with a maximal increase in mass retention from 37.24% to 86.66% at 180 °C. In addition, AEPCMs exhibited significant cost advantages. The most inexpensive AEPCMs synthesized in the laboratory is only 112.01 ¥/kg and an enthalpy cost of 0.57 ¥/kJ, accounting for 30.1% and 35.8% of TD cost, respectively. Incorporation of AEPCMs and TD increased the lightweight component of asphalt binders and caused damage to the conventional physical and rheological properties of asphalt binders, but polar AEPCMs had fewer deleterious effects on asphalt compared to nonpolar TD.
研究领域:
材料科学
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土木工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Qian Wang,Wen-Qi Chen,Xing-Yu Liu,Yi Liu,Feng-Lei Jiang
Near-infrared (NIR)-emitting PbS quantum dots (QDs) are endowed with good stability, high quantum yield, and long lifetime in the body, so they are promising agents in biological imaging. They quickly form the so-called “protein corona” through nonspecific adsorption with proteins in biological fluids once upon exposure to the biological system. Here, PbS QDs and human serum albumin (HSA) were selected as the model system. Fluorescence quenching spectroscopic studies indicated a static quenching process caused by the addition of PbS QDs, which was corroborated by the UV–vis absorption spectroscopy and fluorescence lifetime. Thermodynamic parameters were obtained by the fluorescence quenching method. The enthalpy change and entropy change were well correlated with the “enthalpy–entropy compensation” (EEC) equation summarized in this work. The slope (α = 1.08) and the intercept (TΔS0 = 34.44 kJ mol–1) indicated that the interaction resembled a protein–protein association. The both negative signs of enthalpy change and entropy change were elucidated by a proposed “two-step association–interaction” (TSAI) model. Agarose gel electrophoresis (AGE) and dynamic light scattering (DLS) showed that the binding ratio was roughly 2:1 (HSA/QDs), resembling sandwich-like structures. Furthermore, the secondary structure of HSA depended on the concentration of added QDs and the incubation time. The results preliminarily uncovered the physicochemical properties of QDs in the presence of proteins and elucidated the role of time evolution. These will inspire us to make the fluorescent QDs more biocompatible and use them in a proper way.
研究领域:
生物化学
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纳米医学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2015
·Vol. 61
·期 6
·2028-2034
·
IF 2.748
Kaihong Chen,Wenjun Lin,Xini Yu,Xiaoyan Luo,Fang Ding,Xi He,Haoran Li,Congmin Wang
Five kinds of anion-functionalized ionic liquids (ILs) with different basicity and substituent were selected, prepared and applied in the capture of SO 2 from flue gas, where the concentration of SO 2 is only 2000 ppm. The effect of the anion on SO 2 absorption capacity, desorption residue, and available absorption capacity under 2000 ppm was investigated. The relationship between available absorption capacity and absorption enthalpy was also studied. Through a combination of thermodynamic analysis and quantum calculation, the results indicated that the effect of the cation in the IL on absorption enthalpy was significant. However, the effect of chain length in the cation was weak. Hence, a new IL with low molecular weight, [P 4442 ][Tetz], was further designed and applied for the capture of SO 2 , which shows the high absorption capacity of 0.18 g SO 2 per g IL and excellent reversibility for 2000 ppm SO 2 . © 2015 American Institute of Chemical Engineers AIChE J , 61: 2028–2034, 2015
研究领域:
环境科学
·
化学工程
✓ 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）