JOURNAL OF PHYSICAL CHEMISTRY B
·
2018
·
IF 3.146
Minglun Li,Yuyuan Lu,Lijia An
Using our recently proposed method to obtain salt and ion polarizabilities in aqueous solutions, we determine the polarizabilities of five salts (LiCl, NaCl, NaBr, KBr, and MgSO4) in water–acetonitrile, water–ethanol, and water–acetone solutions at eight different water–organic solvent compositions at the D-line of sodium (589.3 ± 0.1 nm). Setting Li+ as the reference ion, we determine the ion polarizabilities of Na+, Cl–, and Br– in binary liquid mixtures. Our results show that cation polarizability is nearly unaffected by solvent composition, but anion polarizability exhibits a nonmonotonic behavior with increasing mole fraction of the organic component in the liquid mixture. This suggests that ion polarizability in a solution is affected by the solvent. The results of salt and ion polarizabilities can be used as important reference data for physical chemistry, atmospheric science, and biophysics.
研究领域:
物理化学
·
大气科学
·
生物物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2025
·Vol. 55
·期 2
·290-305
·
IF 1.3
Cui Rui-Zhi,Nie Guo-Liang,Ren Hong-Bao,Yang Qiu-Ye,Li Wu
Based on mother liquor rich in lithium, strontium and bromine obtained from the brine of underground oil–gas field in Qaidam Basin after pre-treatment, the isothermal dissolution equilibrium method was used to study the stable solid–liquid equilibria and phase diagrams of the quinary system LiBr − NaBr − KBr − SrBr 2 − H 2 O and its subsystems at 298.15 K. The solubilities of solids in each system were determined, respectively, and the equilibrium solid phases were determined. In order to clearly reflect the regularities and characteristics of phase equilibria of multi-component systems, the corresponding phase diagrams were also plotted and analyzed. The Pitzer model for the quinary system was parameterized by using relevant experimental thermodynamic data. The solubilities of solids in this quinary system and its subsystems were calculated and compared with experimental results. The results not only help to reveal the thermodynamic behavior of relevant bromides in the process of brine concentration, but also provide some theoretical support for the comprehensive utilization of its brine resources.
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Xiaoqin Cao,Shiyuan Wang,Runxi Wang,Zhenghua Sun,Yujun Feng,Hongyao Yin
Partially hydrolyzed polyacrylamide (HPAM) hydrogels are widely used as fracturing fluids for extracting underground hydrocarbon resources. Weighting salts are incorporated to enhance hydrogel density to address the extreme pressure encountered in ultra-deep reservoirs. These salts exert significant effects on performance; however, the underlying mechanisms remain poorly understood, and the development of high-performance fracturing fluids remains a significant challenge. This study systematically examines the influence of potassium formate (HCOOK) and sodium bromide (NaBr) as weighting agents on the viscoelasticity of high-density HPAM hydrogels. The findings indicate that HCOOK exerts a more pronounced adverse impact on the viscoelasticity of HPAM hydrogels compared to NaBr. Molecular dynamics simulations reveal that the inferior viscoelasticity of the HCOOK-based polymer hydrogels is attributed to stronger supramolecular interactions between the crosslinker and HCOOK. This study develops an enhanced-performance high-density fracturing fluid with a density of up to 1.40 g/cm 3 , a maximum drag reduction rate of 75.1 %, and temperature tolerance up to 160 °C by integrating ultra-high molecular weight HPAM, a dual crosslinking strategy, and NaBr as weighting salt. This research not only provides fundamental insights into the complex interactions among weighting agents, crosslinkers, and polymers but also presents an enhanced-performance high-density fracturing fluid for ultra-deep hydrocarbon reservoirs.
研究领域:
高分子科学
·
石油工程
·
材料科学
·
化学工程
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhemin Gong,Lingjun Shu,Jingxuan Yin,Chengwei Gao,Yongxing Liu,Xiaolong Zhou,Xiang Shen,Shixun Dai,Changgui Lin,Qing Jiao
Here, we report the SiS 2 –NaBr double-doped sulfide superionic conductor Na 3.02 Si 0.1 Sb 0.9 S 3.92 Br 0.08 . The dual-doping effect of SiS 2 and NaBr in the Na 3 SbS 4 electrolyte was investigated by mechanical ball milling and high-temperature heat treatment. The improved glass–ceramic Na 3.02 Si 0.1 Sb 0.9 S 3.92 Br 0.08 solid electrolyte obtained a high ionic conductivity of 2.26 × 10 −3 S/cm and a low activation energy of 0.077 eV (0.25 eV for Na 3 SbS 4 ) at room temperature. Moreover, the electrochemical property test was characterized by a higher critical current density of 1.228 mA/cm 2 (0.585 mA/cm 2 for Na 3 SbS 4 ) and stable cycling at 0.1 mA cm −2 current densities exceeding 120 h (50.33 h for Na 3 SbS 4 ). Some Si atoms occupying the Sb position greatly contributed to the formation of the Na 3 SbS 4 high-ionic conductive phase. The introduction of an appropriate amount of halogen improved the compactness of the sample and nearly suppressed the majority of H 2 S release from the original electrolyte. The substitution effect and the ion conduction structure were analyzed in detail.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo,Yu Pan
The solubilities and refractive indices of the NaBr–SrBr 2 –H 2 O and KBr–SrBr 2 –H 2 O systems at 288.15 K were investigated with the isothermal dissolution method. The phase diagrams and refractive index diagrams were plotted for the two systems at 288.15 K. The phase diagrams consist of one two-salt cosaturated invariant point , two univariant solubility isotherms, and two stable crystallization fields. The two systems belong to the simple eutectic type, and neither double salt nor solid solution was found. The refractive indices change regularly with the strontium bromide concentration increasing in solution, and reach the maximum value at the eutectic point. On the basis of Pitzer and Harvie-Weare (HW) model, the binary and mixing Pitzer parameters and solubility equilibrium constants of equilibrium solid salts for the two ternary systems at 288.15 K were acquired. And then, the solubilities for the ternary systems at 288.15 K were demonstrated. A comparison shows that the calculated solubilities agree well with the experimental data.
研究领域:
化学热力学
·
溶液化学
·
相平衡
·
无机化学
·
热力学建模
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Si-Qi Pan,Ping Luo,Jia Chen,Tairui Wu,Bin Xu,Fushan Chen,De-Yin Wu,Bin Ren,Guo-Kun Liu,Jianwei Xie,Pengxiang Xu,Zhong-Qun Tian
Reagent purity is crucial to experimental research, considering that the ignorance of ultratrace impurities may induce wrong conclusions in either revealing the reaction nature or qualifying the target. Specifically, in the field of surface science, the strong interaction between the impurity and the surface will bring a non-negligible negative effect. Surface-enhanced Raman spectroscopy (SERS) is a highly surface-sensitive technique, providing fingerprint identification and near-single molecule sensitivity. In the SERS analysis of trace chloromethyl diethyl phosphate (DECMP), we figured out that the SERS performance of DECMP is significantly distorted by the trace impurities from DECMP. With the aid of gas chromatography-based techniques, one strongly interfering impurity (2,2-dichloro-N,N-dimethylacetamide), the byproduct during the synthesis of DECMP, was confirmed. Furthermore, the nonignorable interference of impurities on the SERS measurement of NaBr, NaI, or sulfadiazine was also observed. The generality ignited us to refresh and consolidate the guideline for the reliable SERS qualitative analysis, by which the potential misleading brought by ultratrace impurities, especially those strongly adsorbed on Au or Ag surfaces, could be well excluded.
研究领域:
分析化学
·
表面科学
·
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）