Journal of Chemical & Engineering Data最新文献

{"title":"Temperature and Composition Dependence of the Densities, Speed of Sound, and Viscosities of Binary Liquid Mixtures of Tetrahydrofuran with Methyl Acetate, Propyl Acetate, and Pentyl Acetate","authors":"Gyan Prakash Dubey*,&nbsp;Aarzoo Ahuja and Rachana Singh,&nbsp;","doi":"10.1021/acs.jced.4c0003510.1021/acs.jced.4c00035","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00035https://doi.org/10.1021/acs.jced.4c00035","url":null,"abstract":"<p >Densities, speeds of sound, and viscosity values have been experimentally measured at temperature ranges from (298.15 to 308.15 K) and a pressure of 0.1 MPa for the whole compositions for the binary mixtures of tetrahydrofuran with methyl acetate, propyl acetate, and pentyl acetate. Excess molar volume (<i>V</i>_<i>m</i>^<i>E</i>), excess molar isentropic compressibility (Δ<i>K</i>_<i>S,m</i>^<i>E</i>), viscosity deviation (Δη), excess Gibb’s free energy of activation for viscous flow (Δ<i>G</i>^*<i>E</i>), and partial molar volume (<i>V̅</i>_{<i>m</i>,<i>i</i>}) have been derived with the help of experimental results and fitted to an extended Redlich–Kister equation by the least-squares approach that simultaneously considers the dependency on composition and temperature. For the calculated and experimental data, the standard deviations are estimated. The magnitude and sign of these excess properties have been utilized to explain the results in terms of structural and intermolecular interactions. Various semiempirical viscosity relations were tested using the data of viscosity of binary mixtures.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"69 11","pages":"3678–3688 3678–3688"},"PeriodicalIF":2.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142641094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Density and Dynamic Viscosity of Hydrotrope-Assisted Surfactant Free Microemulsions Formed with Hydrophobic Deep Eutectic Solvents","authors":"Anjali, Siddharth Pandey","doi":"10.1021/acs.jced.4c00182","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00182","url":null,"abstract":"In surfactant-free microemulsions (SFMEs), a hydrotrope assists in microemulsion formation. Use of natural hydrophobic deep eutectic solvents (HDESs) as the oil phase imparts environmental benefits. Density and dynamic viscosity are reported for hydrotrope ethanolamine (ETA)-assisted HDES-based SFME solutions formed using <i>n</i>-decanoic acid (DA) as one constituent of the HDES and one of the five structurally different closed or open ring terpenoids [thymol, <span>l</span>(−)-menthol, linalool, β-citronellol, and geraniol] as the other constituent in equimolar ratio with water as the polar medium. The amount of water was varied at a fixed concentration of hydrotrope where the formation of the microemulsion was optimum. Density decreased linearly with an increase in temperature for all systems. At higher water fractions, the SFMEs exhibit higher density than that expected, ideally providing evidence for the presence of water pools. Because of the inherent complexity associated, the temperature dependence of the dynamic viscosity adheres better to the Vogel–Fulcher–Tammann (VFT) formulation instead of the Arrhenius equation. As water is added to a high-viscosity (HDES/ETA) system, viscosity initially decreases but increases at higher water contents. It is attributed to the increasing size of the microemulsions formed as they create a hindrance to the overall fluidity. The density and dynamic viscosities of the SFME systems reveal important structural information about these organized assemblies.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"51 1","pages":""},"PeriodicalIF":2.694,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study on the Equilibrium Vapor Pressures of Mixed Weak Acid–Salt Solutions for Frost-Free Air-Source Heat Pumps","authors":"Hongshuo Qu, Libo Wang, Xiao Zhang, Xiaosong Zhang, Shifang Huang","doi":"10.1021/acs.jced.4c00309","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00309","url":null,"abstract":"Weak acid–salt solutions have become an alternative to antifreeze in frost-free air-source heat pumps (FFASHPs) owing to their low corrosiveness and cost. Although mixed weak acid–salts are effective for further reducing the freezing points and vapor pressures of the solutions, corresponding data are currently lacking, especially for temperatures ≤273 K. In this study, the vapor pressures of mixed potassium acetate (CH₃COOK)–sodium formate (HCOONa)–water (H₂O) and sodium acetate (CH₃COONa)–potassium formate (HCOOK)–H₂O were measured and correlated. Considering the circulation of antifreeze solutions in FFASHPs, 1:1 and 1:5 mass ratios of CH₃COOK to HCOONa and CH₃COONa to HCOOK were selected, respectively. The tested solute concentrations ranged from 0 to 50 wt %, and the tested temperatures ranged from 258 to 333 K. In total, 145 vapor pressure data points, ranging from 0.1121 to 12.9726 kPa, were obtained and fitted with modified Antoine equations. The average absolute deviations between the measured and calculated values were within 2.26%. The vapor pressures of the 44 wt % CH₃COOK–HCOONa (CH₃COOK:HCOONa = 1:1) and 42 wt % CH₃COONa–HCOOK (CH₃COONa:HCOOK = 1:5) solutions were approximate to those of the 30 wt % CaCl₂ solution below 278 K, and the mixed weak acid–salt solutions could be regenerated at lower temperature conditions.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"8 1","pages":""},"PeriodicalIF":2.694,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Density and Dynamic Viscosity of Hydrotrope-Assisted Surfactant Free Microemulsions Formed with Hydrophobic Deep Eutectic Solvents","authors":"Anjali,&nbsp; and ,&nbsp;Siddharth Pandey*,&nbsp;","doi":"10.1021/acs.jced.4c0018210.1021/acs.jced.4c00182","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00182https://doi.org/10.1021/acs.jced.4c00182","url":null,"abstract":"<p >In surfactant-free microemulsions (SFMEs), a hydrotrope assists in microemulsion formation. Use of natural hydrophobic deep eutectic solvents (HDESs) as the oil phase imparts environmental benefits. Density and dynamic viscosity are reported for hydrotrope ethanolamine (ETA)-assisted HDES-based SFME solutions formed using <i>n</i>-decanoic acid (DA) as one constituent of the HDES and one of the five structurally different closed or open ring terpenoids [thymol, <span>l</span>(−)-menthol, linalool, β-citronellol, and geraniol] as the other constituent in equimolar ratio with water as the polar medium. The amount of water was varied at a fixed concentration of hydrotrope where the formation of the microemulsion was optimum. Density decreased linearly with an increase in temperature for all systems. At higher water fractions, the SFMEs exhibit higher density than that expected, ideally providing evidence for the presence of water pools. Because of the inherent complexity associated, the temperature dependence of the dynamic viscosity adheres better to the Vogel–Fulcher–Tammann (VFT) formulation instead of the Arrhenius equation. As water is added to a high-viscosity (HDES/ETA) system, viscosity initially decreases but increases at higher water contents. It is attributed to the increasing size of the microemulsions formed as they create a hindrance to the overall fluidity. The density and dynamic viscosities of the SFME systems reveal important structural information about these organized assemblies.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"69 11","pages":"3718–3729 3718–3729"},"PeriodicalIF":2.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142641092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature and Composition Dependence of the Densities, Speed of Sound, and Viscosities of Binary Liquid Mixtures of Tetrahydrofuran with Methyl Acetate, Propyl Acetate, and Pentyl Acetate","authors":"Gyan Prakash Dubey, Aarzoo Ahuja, Rachana Singh","doi":"10.1021/acs.jced.4c00035","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00035","url":null,"abstract":"Densities, speeds of sound, and viscosity values have been experimentally measured at temperature ranges from (298.15 to 308.15 K) and a pressure of 0.1 MPa for the whole compositions for the binary mixtures of tetrahydrofuran with methyl acetate, propyl acetate, and pentyl acetate. Excess molar volume (<i>V</i>_<i>m</i>^<i>E</i>), excess molar isentropic compressibility (Δ<i>K</i>_<i>S,m</i>^<i>E</i>), viscosity deviation (Δη), excess Gibb’s free energy of activation for viscous flow (Δ<i>G</i>^*<i>E</i>), and partial molar volume (<i>V̅</i>_{<i>m</i>,<i>i</i>}) have been derived with the help of experimental results and fitted to an extended Redlich–Kister equation by the least-squares approach that simultaneously considers the dependency on composition and temperature. For the calculated and experimental data, the standard deviations are estimated. The magnitude and sign of these excess properties have been utilized to explain the results in terms of structural and intermolecular interactions. Various semiempirical viscosity relations were tested using the data of viscosity of binary mixtures.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"18 1","pages":""},"PeriodicalIF":2.694,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study on the Equilibrium Vapor Pressures of Mixed Weak Acid–Salt Solutions for Frost-Free Air-Source Heat Pumps","authors":"Hongshuo Qu,&nbsp;Libo Wang,&nbsp;Xiao Zhang,&nbsp;Xiaosong Zhang and Shifang Huang*,&nbsp;","doi":"10.1021/acs.jced.4c0030910.1021/acs.jced.4c00309","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00309https://doi.org/10.1021/acs.jced.4c00309","url":null,"abstract":"<p >Weak acid–salt solutions have become an alternative to antifreeze in frost-free air-source heat pumps (FFASHPs) owing to their low corrosiveness and cost. Although mixed weak acid–salts are effective for further reducing the freezing points and vapor pressures of the solutions, corresponding data are currently lacking, especially for temperatures ≤273 K. In this study, the vapor pressures of mixed potassium acetate (CH₃COOK)–sodium formate (HCOONa)–water (H₂O) and sodium acetate (CH₃COONa)–potassium formate (HCOOK)–H₂O were measured and correlated. Considering the circulation of antifreeze solutions in FFASHPs, 1:1 and 1:5 mass ratios of CH₃COOK to HCOONa and CH₃COONa to HCOOK were selected, respectively. The tested solute concentrations ranged from 0 to 50 wt %, and the tested temperatures ranged from 258 to 333 K. In total, 145 vapor pressure data points, ranging from 0.1121 to 12.9726 kPa, were obtained and fitted with modified Antoine equations. The average absolute deviations between the measured and calculated values were within 2.26%. The vapor pressures of the 44 wt % CH₃COOK–HCOONa (CH₃COOK:HCOONa = 1:1) and 42 wt % CH₃COONa–HCOOK (CH₃COONa:HCOOK = 1:5) solutions were approximate to those of the 30 wt % CaCl₂ solution below 278 K, and the mixed weak acid–salt solutions could be regenerated at lower temperature conditions.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"69 11","pages":"3930–3942 3930–3942"},"PeriodicalIF":2.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142641093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solubility of Fmoc-l-valine in Fourteen Monosolvents: Characterization, Determination, Analysis, and Model Correlation","authors":"Junjie Li, Long Zhao, Xin Xing, Yusheng Xiao, Min Ding, Peng Wang, Bingbing Li","doi":"10.1021/acs.jced.4c00419","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00419","url":null,"abstract":"The mole fraction solubility of Fmoc-<span>l</span>-valine in 14 pure solvents (methanol, ethanol <i>n</i>-propanol, isopropanol, <i>n</i>-butanol, isobutanol, <i>sec</i>-butanol, <i>n</i>-pentanol, isopentanol, butyl acetate, acetone, acetonitrile, 2-butanone, dimethyl carbonate) was determined by the static gravimetric method at a temperature range of 283.15 to 323.15 K under a pressure of 101.2 kPa. Among the 14 monosolvents, solubility increased with the increase of absolute temperature. The order of solubility is as follows: acetone (0.06274 mol/mol) &gt; 2-butanone (0.05704 mol/mol) &gt; methanol (0.03966 mol/mol) &gt; ethanol (0.03124 mol/mol) &gt; <i>sec</i>-butanol (0.02749 mol/mol) &gt; <i>n</i>-propanol (0.02535 mol/mol) &gt; <i>n</i>-butanol (0.02445 mol/mol) &gt; <i>n</i>-pentanol (0.02335 mol/mol) &gt; butyl acetate (0.02088 mol/mol) &gt; isopropanol (0.02038 mol/mol) &gt; isopentanol (0.01916 mol/mol) &gt; isobutanol (0.01525 mol/mol) &gt; dimethyl carbonate (0.01078 mol/mol) &gt; acetonitrile (0.004770 mol/mol). The equilibrium solid phase of Fmoc-<span>l</span>-valine in the solvent systems was characterized by powder X-ray diffraction analysis. The solubility data were fitted using the modified Apelblat model, NRTL model, UNIQUAC model, and Margules model; at the same time, the model parameters and data deviation values were calculated. The results showed that the modified Apelblat model had better correlation results. Interaction energy, interaction region indicator (IRI), and molecular electrostatic potential surface (MEPS) were used to determine the internal interactions within Fmoc-<span>l</span>-valine solutions. The Hansen solubility parameters (HSPs) was utilized to assess the solvents’ capability and to elucidate its ability to dissolve Fmoc-<span>l</span>-valine. Furthermore, the mixing thermodynamic characteristics of Fmoc-<span>l</span>-valine in selected solvents were calculated using the NRTL model, which revealed that the mixing process was spontaneous and entropy-driven. The solubility data can be used for the preparation and optimization of the Fmoc-<span>l</span>-valine crystallization processes.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"19 1","pages":""},"PeriodicalIF":2.694,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isopiestic Determination of Water Activities and Solid–Liquid Equilibria in the Mixed Borate System NaB(OH)4–Na2B4O5(OH)4–H2O at 323.15 K","authors":"Yi Hua, Jinqiu Ma, Shuaiqi Sun, Qingfen Meng, Dan Li, Yong Ma, Lingzong Meng, Guangli Zhou","doi":"10.1021/acs.jced.4c00271","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00271","url":null,"abstract":"The water activities and osmotic coefficients in the ternary system NaB(OH)₄–Na₂B₄O₅(OH)₄–H₂O at 323.15 K were investigated with the isopiestic method. The solubilities and physicochemical properties in the NaBO₂–Na₂B₄O₇–H₂O system at 323.15 K were studied with the isothermal dissolution equilibrium method. The phase diagram in the system consists of two single salt regions for NaBO₂·4H₂O and Na₂B₄O₇·10H₂O, one invariant point saturated with the above salts, and two univariant solubility curves. On the basis of the Pitzer model, the Pitzer binary parameters of Na₂B₄O₅(OH)₄ and mixing parameters were fitted with the osmotic coefficients and solubilities. The dissolution equilibrium constant of Na₂B₄O₇·10H₂O was calculated with the experimental solubility data and parameters. The calculated solubilities and water activities with the parameters and dissolution equilibrium constants of NaBO₂·4H₂O and Na₂B₄O₇·10H₂O agree with the experimental data.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"53 1","pages":""},"PeriodicalIF":2.694,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Density, Sound Velocity, And Conductance of Levocetirizine in Aqueous Sodium Chloride at Variable Temperatures","authors":"Navya Grover, Vivek Pathania, Shashi Kiran Vermani, Bal Krishan Vermani, Shrutila Sharma","doi":"10.1021/acs.jced.4c00165","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00165","url":null,"abstract":"Levocetirizine (LC), an antihistaminic, was tested in aqueous solutions with NaCl for density, sound velocity, and conductance. Volumetric and compressibility properties of an electrolyte-containing aqueous drug solution were investigated by evaluating trends in certain parameters and studying solute–solvent interactions in the ternary system. To study the effect of drug concentration and temperature on system behavior, experiments were conducted at varying drug concentrations (0–0.10 mol. kg^–1), NaCl concentrations (0.05, 0.10, and 0.15 mol·kg^–1), and temperatures (298.15, 308.15, and 318.15 K). In aqueous solutions, both specific and nonspecific LC–electrolyte interactions stabilize the solution mixture. Conductance tests have shown that drug molecules in sodium chloride solutions at different concentrations alter their structure. Different studies have been used to elucidate aqueous electrolytic solution interactions. Studying these systems helps illuminate drug action mechanisms and electrolyte–drug chemistry.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"15 1","pages":""},"PeriodicalIF":2.694,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isopiestic Determination of Water Activities and Solid–Liquid Equilibria in the Mixed Borate System NaB(OH)4–Na2B4O5(OH)4–H2O at 323.15 K","authors":"Yi Hua,&nbsp;Jinqiu Ma,&nbsp;Shuaiqi Sun,&nbsp;Qingfen Meng,&nbsp;Dan Li,&nbsp;Yong Ma,&nbsp;Lingzong Meng* and Guangli Zhou*,&nbsp;","doi":"10.1021/acs.jced.4c0027110.1021/acs.jced.4c00271","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00271https://doi.org/10.1021/acs.jced.4c00271","url":null,"abstract":"<p >The water activities and osmotic coefficients in the ternary system NaB(OH)₄–Na₂B₄O₅(OH)₄–H₂O at 323.15 K were investigated with the isopiestic method. The solubilities and physicochemical properties in the NaBO₂–Na₂B₄O₇–H₂O system at 323.15 K were studied with the isothermal dissolution equilibrium method. The phase diagram in the system consists of two single salt regions for NaBO₂·4H₂O and Na₂B₄O₇·10H₂O, one invariant point saturated with the above salts, and two univariant solubility curves. On the basis of the Pitzer model, the Pitzer binary parameters of Na₂B₄O₅(OH)₄ and mixing parameters were fitted with the osmotic coefficients and solubilities. The dissolution equilibrium constant of Na₂B₄O₇·10H₂O was calculated with the experimental solubility data and parameters. The calculated solubilities and water activities with the parameters and dissolution equilibrium constants of NaBO₂·4H₂O and Na₂B₄O₇·10H₂O agree with the experimental data.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"69 11","pages":"4049–4058 4049–4058"},"PeriodicalIF":2.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142641089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}