Langmuir最新文献

{"title":"Molecular Structures of Poly(methyl methacrylate) at Different Buried Interfaces Revealed by Sum Frequency Generation Vibrational Spectroscopy","authors":"Xintong Hu, Bolin Li, Zhaohui Xu, Yong-Hao Ma, Xiaofeng Han, Linhua Hu, Chu Wang, Ningfang Wang, Jinsheng Xu, Zhigao Sheng, Xiaolin Lu","doi":"10.1021/acs.langmuir.4c03038","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03038","url":null,"abstract":"Silica or calcium fluoride (CaF₂) substrate-supported poly(methyl methacrylate) (PMMA) thin films as insulating layers are commonly used in photoelectric/photovoltaic devices to improve the efficiency or stability of these devices. However, a comparative investigation of molecular structures at buried PMMA/silica and PMMA/CaF₂ interfaces under thermal stimuli remains unexplored. In this study, we qualitatively and quantitatively revealed different molecular orderings and orientations of PMMA at two interfaces before and after annealing using sum frequency generation (SFG) vibrational spectroscopy. SFG vibrations were carefully assigned by using various deuterated PMMAs. SFG results indicated that, at the buried PMMA/silica interface, the side OCH₃ groups were prone to lie down before annealing and tended to stand up after annealing. In contrast, the case was the opposite at the buried PMMA/CaF₂ interface. The relative hydrophobicity/hydrophilicity of the two substrates and the developed hydrogen bonds upon annealing at the buried PMMA/silica interface, which is absent at the CaF₂ surface, are believed to be the driving forces for different interfacial molecular structures. This study benefits the molecular-level understanding of the interfacial local structural relaxation of polymers at buried interfaces and the rational design of photoelectric/photovoltaic devices from the molecular level.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on the Adhesion Force between Tetrabutylammonium Bromide Hydrate Particles Using Atomic Force Microscopy.","authors":"Fan Xiao, Wei Wang, Longxin Chen, Kai Li, Yuntong Ge, Jionghao Li","doi":"10.1021/acs.langmuir.4c00953","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c00953","url":null,"abstract":"<p><p>This work investigates the adhesion force between tetrabutylammonium bromide (TBAB) hydrate particles dispersed in decane at different temperatures and TBAB concentrations using an atomic force microscopy. The thickness of the quasi-liquid layer (QLL) on the surface of the hydrate particles is calculated based on an adhesion force model. The results of force measurements indicate that the adhesion force between the hydrate particles increases with increasing temperature when TBAB concentration is 30 wt %. The increment of adhesion force between particles could be due to the increase in the QLL thickness on the particle surfaces. Furthermore, the force results also reveal that the adhesion force between hydrate particles(ice) at 253 K decreases when TBAB concentration increases from 0 to 30 wt %. The calculation indicates that QLL on the surface of formed hydrate particles becomes thinner at higher TBAB concentrations, which could be due to the conversion rate of water to hydrate within particles. The thickness of QLL is directly influenced by the temperature and TBAB concentration, which contributes to the adhesion force between hydrate particles.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thin Liquid Film View and Shear Stress During the Sliding of Air Bubbles on Tilted Plates","authors":"Fatemeh Hamidzadeh, Alireza Hooshanginejad, Kaiwu Huang, Tri Hoa Phan, Sunghwan Jung, Lei Pan","doi":"10.1021/acs.langmuir.4c02901","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c02901","url":null,"abstract":"The challenge when studying the impact and sliding of free-rising air bubbles on tilted surfaces is an experimental limitation in obtaining the film thickness of thin liquid film (TLF) during the bubbles’ sliding on tilted surfaces. In this work, spatiotemporal evolution in the film thickness of the moving TLF between a sliding air bubble and a tilted plate was monitored by using a two-wavelength synchronized reflection interferometry microscopy (SRIM) technique. The evolution of the film thickness was directly determined from a timed series of monochromatic interference fringes recorded simultaneously at two different wavelengths. From the film thickness profile, a shear stress map at a given time was determined at different bubble sizes and inclination angles. Results showed that the film thickness of TLFs during the bubbles’ sliding on tilted surfaces was in the range of 300–1200 nm, depending on bubble size and tilting angles. Sliding of air bubbles on tilted plates over a thin gap with a few hundred nanometers thickness yielded shear stress in the order of 10–50 Pa. Both the larger bubble size and higher tilting angles yielded a higher shear stress. Experimental results were quantitatively compared to numerical results obtained using the Reynolds lubrication theory. A good match between the two results was achieved. Numerical results suggested that a maximum shear stress exerted on a tilted plate occurred at a 25° tilting angle. This is the first time that the spatiotemporal evolution of TLF during bubbles’ sliding on tilted surfaces has been achieved, and the shear stress exerted on the tilted surface has been directly determined.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carboxymethyl Cellulose Gel Electrolyte Based on Hydrolyzed Keratin Modified for Dendrite-Free Zinc-Ion Batteries","authors":"Tianyun Zhang, Yanci Wang, Yu Li, Yuan Li, Xiangye Li, Peiyao Dou, Fen Ran","doi":"10.1021/acs.langmuir.4c02308","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c02308","url":null,"abstract":"In order to alleviate the dendrite problem of zinc-ion batteries, a gel electrolyte is prepared by Maillard reactions occurring between hydrolyzed wool keratin and carboxymethyl cellulose under heating conditions. The prepared gel electrolyte with the addition of hydrolyzed wool keratin possesses good mechanical properties, and its maximum breaking strength, Young’s modulus, and elastic modulus are 58.7, 10.77 MPa, and 157.73 MJ m², respectively, which are far superior to those of the pure carboxymethyl cellulose gel electrolyte. Because hydrolyzed wool keratin includes amino acids and polypeptides, the ionic conductivity of the prepared gel electrolyte is improved. More importantly, amino and carboxyl groups introduced by hydrolyzed wool keratin contribute to uniform deposition of zinc ions and ease dendrite growth. The assembled symmetric battery was stable for 600 h at a current density of 0.5 mA cm^–2 with a capacity of 0.5 mAh cm^–2. Combined with a NH₄V₄O₁₀ cathode, a full battery provides a cycling stability of over 2000 h with a Coulomb efficiency of 98.02%.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct Imaging of Charge/Dopant Distribution in PANI/PSS Thin Films Using Advanced Frequency Modulation Electrostatic Force Microscopy","authors":"Priyanka Ranka, Virendra Sethi, Aliasgar Q. Contractor","doi":"10.1021/acs.langmuir.4c02012","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c02012","url":null,"abstract":"This paper presents a detailed study that maps the surface charges and dopant distribution on the electropolymerized thin film of polyaniline–poly(styrenesulfonate) (PANI/PSS). The focus is on two distinct states of PANI/PSS: the fully doped emeraldine salt (ES/PSS) and the dedoped emeraldine base (EB/PSS). This investigation utilizes advanced frequency modulation electrostatic force microscopy (FM-EFM) and atomic force microscopy (AFM). The polymer film comprises polymer grains, and FM-EFM data suggest a non-uniform distribution of dopants on the grain surface, with a higher doped periphery than the core. Quantifying the charge at the periphery and core of ES/PSS and EB/PSS grains provides unique insight into the charge distribution within the polymer film. The charge density is estimated to be 10 times higher in the periphery region (∼120 μC/cm²) than in the core region (∼11 μC/cm²) and 100 times higher than EB/PSS (∼0.8 μC/cm²). We have directly observed the morphological changes of PANI/PSS from the ES/PSS state to the EB/PSS state using the AFM topographic profile. These findings provide a better understanding of the behavior of the charge/dopant distribution on the surface of the polymer films and pave the way for further research and development of PANI/PSS-based electronic devices.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of a Three-Phase MnS₂/Co₄S₃/Ni₃S₂ Heterostructure for Boosting Oxygen Evolution.","authors":"Haoran Gao, Zhikun Xu, Shuangyan Lin, Yujing Sun, Lin Li","doi":"10.1021/acs.langmuir.4c02475","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c02475","url":null,"abstract":"<p><p>The rational construction of highly efficient electrocatalysts for the oxygen evolution reaction (OER) plays a critical role in energy conversion systems. Designing heterostructures is a common and effective strategy to improve the performance of electrocatalysts. In this paper, an MnS₂/Co₄S₃/Ni₃S₂ heterostructure was synthesized on Ni foam using a one-step vulcanization method. It provides a modified electronic structure and plentiful three-phase heterogeneous interfaces that can effectively enrich the active sites and accelerate electron transfer, thereby improving the OER activity. Thanks to the heterostructure, the MnS₂/Co₄S₃/Ni₃S₂ exhibits a low overpotential of 265 and 304 mV for the OER to reach current densities of 50 and 100 mA/cm², respectively. Furthermore, the surface reconstruction of MnS₂/Co₄S₃/Ni₃S₂ has been investigated, which revealed the formation of metal hydr(oxy)oxides evolved during the OER process. This work provides a facile strategy for constructing three-phase heterostructures, shedding light on the development of high-performance, nonprecious metal-based OER electrocatalysts.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct Printing of Disperse Dye Inks to Polyester Fabrics without Chemical Pretreatment.","authors":"Chunxiao Jiang, Yan Yu, Jinbo Zhu, Lun Nie, Yiming Xu, Xiangxiang Liu, Ruoxin Li, Guangtao Chang","doi":"10.1021/acs.langmuir.4c01586","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c01586","url":null,"abstract":"<p><p>Direct inkjet digital printing is a relatively green and environmentally friendly textile printing method with a wide range of applications in the textile printing and dyeing industry. However, pretreatment of the fabric is required before digital printing, which will generate certain energy consumption and wastewater. In this study, a digital direct inkjet printing method was developed to improve the printing accuracy of poly(ethylene terephthalate) (PET) fabrics without any pretreatment. A kind of direct inkjet printing ink was prepared by the response change in temperature viscosity. The increase in viscosity inhibits ink bleeding on the fabric, thereby improving printing accuracy. A thermosensitive direct inkjet printing disperse dye ink was prepared by adding cetyltrimethylammonium bromide (CTAB) and 3-methylsalicylic acid (3MS) to the ink. By evaluating the changes in the ink particle size, shear viscosity, and temperature viscosity, it was found that this thermosensitive ink has an excellent average particle size and special changes in viscosity with increasing temperature. When this heat-sensitive ink is printed on a polyester fabric, the fabric does not need pretreatment to improve the clarity of printing, and the printed fabric has satisfactory color fastness to friction and washing.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Electrolyte Properties on Ionic Transport through Solid-State Nanopores: Experiment and Simulation","authors":"Alexander Kiy, Shankar Dutt, Kasimir P. Gregory, Christian Notthoff, Maria Eugenia Toimil-Molares, Patrick Kluth","doi":"10.1021/acs.langmuir.4c01347","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c01347","url":null,"abstract":"Nanopore membranes enable versatile technologies that are employed in many different applications, ranging from clean energy generation to filtration and sensing. Improving the performance can be achieved by conducting numerical simulations of the system, for example, by studying how the nanopore geometry or surface properties change the ionic transport behavior or fluid dynamics of the system. A widely employed tool for numerical simulations is finite element analysis (FEA) using software, such as COMSOL Multiphysics. We found that the prevalent method of implementing the electrolyte in the FEA can diverge significantly from physically accurate values. It is often assumed that salt molecules fully dissociate, and the effect of the temperature is neglected. Furthermore, values for the diffusion coefficients of the ions, as well as permittivity, density, and viscosity of the fluid, are assumed to be their bulk values at infinite dilution. By performing conductometry experiments with an amorphous SiO₂ nanopore membrane with conical pores and simulating the pore system with FEA, it is shown that the common assumptions do not hold for different mono- and divalent chlorides (LiCl, NaCl, KCl, MgCl₂, and CaCl₂) at concentrations above 100 mM. Instead, a procedure is presented where all parameters are implemented based on the type of salt and concentration. This modification to the common approach improves the accuracy of the numerical simulations and thus provides a more comprehensive insight into ion transport in nanopores that is otherwise lacking.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Hofmeister Anions Series on the Langmuir Film of Tetronic 90R4 and Tetronic 701 Block Copolymers.","authors":"Dipali Roy, Bappaditya Naskar, Tanushree Bala","doi":"10.1021/acs.langmuir.4c01878","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c01878","url":null,"abstract":"<p><p>The air-water interfacial behavior of Tetronic 90R4 and Tetronic 701 was studied in the presence of sodium salts with different anions namely <math><msubsup><mrow><mi>PO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>3</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>, <math><msubsup><mrow><mi>SO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>2</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>, <math><msubsup><mrow><mi>MoO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>2</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>, <math><msubsup><mrow><mi>WO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>2</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>, Cl^-, Br^-, <math><msubsup><mrow><mi>NO</mi></mrow><mrow><mn>3</mn></mrow><mrow><mo>-</mo></mrow></msubsup></math>, I^-, and SCN^-. Their presence in the subphase altered the arrangement of both tetronic molecules at the air-water interface. The limiting mean molecular area of the Langmuir film for both tetronics was found to be ion specific; it increased following the series <math><msubsup><mrow><mi>PO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>3</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>< <math><msubsup><mrow><mi>SO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>2</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>< <math><msubsup><mrow><mi>MoO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>2</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>< <math><msubsup><mrow><mi>WO</mi></mrow><mrow><mn>4</mn></mrow><mrow><mrow><mn>2</mn></mrow><mrow><mo>-</mo></mrow></mrow></msubsup></math>< Cl^-< Br^-< <math><msubsup><mrow><mi>NO</mi></mrow><mrow><mn>3</mn></mrow><mrow><mo>-</mo></mrow></msubsup></math>< I^-< SCN^-, which was found to be aligned with the Hofmeister series of anions. Furthermore, the study explored the effects of the hydration enthalpy, free energy, viscosity B_JD coefficient, and polarizability of these anions on the interfacial behavior of tetronics. The Langmuir-Blodgett film morphology was also examined in the presence of these salt species using SEM. Morphologies were explained considering kosmotropic and chaotropic nature of these anions.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Realizing the Rapid Release of Drag Reducers via pH-Induced Oil Phase Transition of Inverse Emulsion","authors":"Yong Zhang, Caifu Zhi, Jie Qi, Li Wang, Hongsheng Lu, Zheng Zhang, Yuzhe Li","doi":"10.1021/acs.langmuir.4c02840","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c02840","url":null,"abstract":"As a key component of slickwater fracturing fluids, emulsion drag reducers play a vital role. The dissolving capacity of traditional emulsion drag reducers is improved by adding hydrophilic surfactants, which leads to poor stability of the emulsion drag reducer. In order to eliminate the contradiction between stability and release of the emulsion drag reducer, here, pH-responsive polymer emulsion was fabricated using the switching solvent (HA) and white oil as the continuous phase. Monomer emulsions exhibit obvious pH-responsive behavior. This is because the deprotonation of HA by pH stimulation leads to a change in the oil–water ratio of the emulsion, thereby facilitating the demulsification of emulsion. The remarkable stability of the monomer emulsion benefits the preparation of inverse emulsion polymers (P(AM-AA-AMPS)). The obtained P(AM-AA-AMPS) polymer emulsion features remarkable stability even after 15 days of storage. Importantly, the P(AM-AA-AMPS) polymer was released from the emulsion efficiently by pH stimulation instead of introducing an extra hydrophilic surfactant, which confirmed the improvement of polymer release by pH stimulation. The viscosity of the P(AM-AA-AMPS) polymer aqueous solution reaches a maximum value of 96 mPa s within 80 s at a pH value of 9.2. The release efficiency of P(AA-AM-AMPS) polymer emulsion is increased by 33% in comparison with that of traditional polymer emulsion (2 min). The P(AM-AA-AMPS) emulsion demonstrated remarkable drag-reduction performance by achieving a drag-reduction rate of 73% at a concentration of 0.05 wt %. P(AM-AA-AMPS) polymer emulsion with pH responsiveness eliminates the contradiction between the stability and release of emulsion drag reducers. Research based on pH-responsive P(AM-AA-AMPS) polymer emulsion provides other ideas for the development of quickly dissolving and long-term storage drag reducers, which is helpful for the development of low-permeability oil and gas resources.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}