Microporous and Mesoporous Materials最新文献

{"title":"Ammonia-assisted dry-gel conversion for preparation of TS-1 with enriched Ti(OSi)3OH active sites","authors":"Huanhao Lin ,&nbsp;Xin Sun ,&nbsp;Yucheng Jin ,&nbsp;Yunkai Yu ,&nbsp;Yueming Liu","doi":"10.1016/j.micromeso.2025.113595","DOIUrl":"10.1016/j.micromeso.2025.113595","url":null,"abstract":"<div><div>Defective Ti(IV) species, i.e. Ti(OSi)₃OH, are highly active catalytic sites within the TS-1 framework, and developing efficient methods to enrich these species has attracted significant attention from both academia and industry sectors. Herein, we developed an ammonia-assisted dry-gel conversion (DGC) method to synthesize TS-1-AM enriched with Ti(OSi)₃OH species using NH₃ (ammonia, AM) as a modifier. Comprehensive characterization using XRD, UV–Vis, SEM, XPS, pyridine-IR, solid-state MAS NMR confirmed the abundant presence of Ti(OSi)₃OH species in TS-1-AM. The modified catalyst demonstrated exceptional performance in alkene epoxidation, achieving approximately 150% higher catalytic activity compared to the parent TS-1, while maintaining excellent cycling stability. Further studies revealed that the synergistic effect of NH₃ and H₂O molecules facilitated the selective cleavage of framework Si-O-Ti bonds, promoting the conversion of Ti(OSi)₄ species to Ti(OSi)₃OH species. Furthermore, the condensation of surface silica hydroxyls, particularly silica hydroxyl nests, enhanced surface hydrophobicity. This straightforward DGC method provides an efficient approach for synthesizing titanosilicates enriched with highly active Ti(OSi)₃OH species.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113595"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient synthesis of smaller crystal ZSM-5 zeolite in low TPAOH-to-silica ratio dry-gel hydrothermal system","authors":"Jiahui Hu,&nbsp;Hao Jiang,&nbsp;Yitong Guo,&nbsp;Jing Liu,&nbsp;Dan Xu,&nbsp;Guoxing Wu,&nbsp;Yanhui Yi,&nbsp;Zhongkui Zhao,&nbsp;Hongchen Guo","doi":"10.1016/j.micromeso.2025.113596","DOIUrl":"10.1016/j.micromeso.2025.113596","url":null,"abstract":"<div><div>The present study is related to the synthesis of nano-sized ZSM-5 zeolite with a dry-gel hydrothermal (DHT) method which is different from the known dry-gel conversion (DGC) method, for it allows the crystallization of the dry-gel in water or n-butylamine solution and the use of common autoclaves. The effects of TPAOH/SiO₂ ratio on the crystal size of ZSM-5 zeolite product, and the viability of synthesizing nano-sized ZSM-5 zeolite using the new method from a TPAOH-poor dry-gel with the aid of co-template n-butylamine are emphasized. Results show that, under the same TPAOH/SiO₂ ratio conditions, DHT synthesis is more beneficial for obtaining smaller crystal size ZSM-5 zeolite than the conventional hydrothermal (CHT) synthesis. The DHT synthesis can be implemented with a TPAOH-rich dry-gel (for example, TPAOH/SiO₂≥0.15) by using simply water as crystallizing solution, to yield discrete nano-sized ZSM-5 zeolite (crystal size 70 nm), or with a TPAOH-poor dry-gel (for example, TPAOH/SiO₂ = 0.075) by using a concentrated NBA aqueous solution (for example, a solution contains 75 % NBA) as crystallizing solution, to yield aggregates of nano-sized ZSM-5 zeolite (primary particle size 200 nm). The nano-sized ZSM-5 zeolites synthesized by the DHT method are inclined to have larger mesoporous and macroporous volume. After being doped with zinc ions, they become promising catalysts for the aromatization of n-hexane (n-h).</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113596"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coadsorption of CO2/CH4 onto zeolitic imidazolate frameworks: The role of inner surface polarity, framework flexibility and topology","authors":"Rimita Bose ,&nbsp;Volodymyr Bon ,&nbsp;Thasleem B. Nanakkal ,&nbsp;Parasuraman Selvam ,&nbsp;Stefan Kaskel ,&nbsp;Niket S. Kaisare","doi":"10.1016/j.micromeso.2025.113557","DOIUrl":"10.1016/j.micromeso.2025.113557","url":null,"abstract":"<div><div>The ZIF sub-family of metal-organic frameworks (MOFs) possesses considerable robustness, tunability of pores, flexibility. These properties make ZIFs potential materials for selective CO₂ adsorption from mixture of gases. However, the lack of experimental multi-component co-adsorption studies makes it challenging for translating the fundamental understanding towards large-scale separation applications. Hence, we focused on both single component adsorption and CO₂/CH₄ co-adsorption measurements. The selected frameworks include ZIF-8, ZIF-90, ZIF-7, ZIF-11 and ZIF-71, which laid the foundation of understanding the influence of functional groups, structural flexibility, crystal size and topology on CO₂ selectivity in presence of CH₄. The results indicate that polar functional group and gate-opening flexibility are a couple of key parameters to improve CO₂ selectivity for ZIFs. Topology of ZIFs, on the other hand, did not show a significant effect on CO₂ selectivity. The Ideal Adsorbed Solution Theory (IAST) is used to show the compatibility between the theoretical and experimental selectivity. The IAST exhibits mismatch for ZIF-90, indicates limitation of the theory in considering the thermodynamic analysis of framework-guest interactions. The present study highlights the factors influencing CO₂ selectivity in presence of CH₄ through both single and multi-component adsorption isotherms.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113557"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of SBA-15 doping with NbVOx and TaVOx on the extractive catalytic oxidative desulfurization of dibenzothiophene","authors":"Katarzyna Stawicka,&nbsp;Julia Gajewska,&nbsp;Maria Ziolek,&nbsp;Maciej Trejda","doi":"10.1016/j.micromeso.2025.113592","DOIUrl":"10.1016/j.micromeso.2025.113592","url":null,"abstract":"<div><div>Unsupported NbVO_x and TaVO_x mixed oxides as well as materials based on SBA-15 silica support were prepared, characterized and applied as catalysts for extractive catalytic oxidative desulfurization (ECODS) of dibenzothiophene (DBT). Properties of the materials obtained and the role of active centers and mesoporous support in the catalytic process were examined by low-temperature nitrogen physisorption, XRD, SEM-EDS, XPS, UV–Vis, chemisorption of pyridine combined with FT-IR spectroscopy as well as by test reactions, i.e. dehydration and dehydrogenation of 2-propanol and cyclization and dehydration of 2,5-hexanedione. The highest effectiveness of DBT removal from the oil phase, reaching up to 98 % within 15 min at 60 °C was shown by the supported materials prepared by impregnation method. The superior efficiency of DBT removal achieved for niobium containing samples could be related to its ability to interact with hydrogen peroxide towards the formation of reactive oxygen species.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113592"},"PeriodicalIF":4.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mesoporous carbon nanospheres encapsulated CoFe2O4 to enhance peroxymonosulfate activation for achieving efficient sulfamethoxazole degradation","authors":"Wenhao Zhao,&nbsp;Ruifu Han,&nbsp;Chenglong Ge,&nbsp;Denghui Zhang,&nbsp;Chunming Jiang,&nbsp;Xuan Zhang","doi":"10.1016/j.micromeso.2025.113591","DOIUrl":"10.1016/j.micromeso.2025.113591","url":null,"abstract":"<div><div>To effectively improve the electron transfer ability mediated by carbon nanomaterials and enhance their activation ability towards peroxymonosulfate (PMS), a novel bimetallic/carbon matrix composite (Mesoporous carbon nanospheres encapsulated CoFe₂O₄, CoFe₂O₄@MCHS) was prepared for the activation of PMS to degrade sulfamethoxazole (SMX). The system removed 98.55 % of SMX in 30 min using a lower concentration of catalyst (0.05 g/L) and oxidant (1 mM). The superior catalytic performance of CoFe₂O₄@MCHS was due to the high specific surface area and pore structure, which offered numerous active sites, while the distinctive yolk-shell architecture safeguarded the active center and enhanced catalyst stability. Surface-bound radicals and electron transfer played a dominant role in the SMX degrading process, while the CoFe₂O₄@MCHS/PMS system exhibited enhanced oxidation of electron-rich organic compounds. Moreover, CoFe₂O₄@MCHS/PMS exhibited tolerance to a broad spectrum of initial pH levels and demonstrated significant resistance to prevalent anions and humic acid in water, sustaining an effective degradation across various aqueous environments. Four possible degradation pathways of SMX were proposed. In summary, the CoFe₂O₄@MCHS/PMS system was both extremely effective and environmentally friendly, offering a novel approach to treat antibiotic wastewater.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113591"},"PeriodicalIF":4.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of synthesis parameters on ZIF-8 morphology: Insights from experimental and statistical integrated analysis","authors":"Cristina Sanchez Cereceda,&nbsp;Yuncheng Du","doi":"10.1016/j.micromeso.2025.113588","DOIUrl":"10.1016/j.micromeso.2025.113588","url":null,"abstract":"<div><div>Zeolitic Imidazole Framework-8 (ZIF-8) is an important class of metal-organic frameworks (MOFs), which has gained significant attention due to its unique morphological properties, such as high surface area and tunable porosity, making it suitable for applications in catalysis and gas storage. The synthesis of ZIF-8 is highly sensitive to various parameters, including precursor concentration, which affects its morphology and functionality. While many studies have examined the effects of synthesis parameters on ZIF-8 synthesis, they typically adjust only one factor at a time, thus overlooking the potential combined effect of multiple parameters. This study focuses on the joint effect of three critical parameters, i.e., precursor concentration, temperature, and solvent composition, on ZIF-8 morphology. Specifically, a three-factor, three-level experimental design is used to guide our investigation by varying the molar ratio of Zn²⁺:Hmim:solvent (1:60:2228, 1:100:2228, and 1:140:2228), temperatures (0 °C, 24 °C, and 50 °C), and solvent mixtures (methanol:water in volume ratios of 50:50, 70:30, and 90:10). The results show that the size of ZIF-8 varied from 57 nm to 222 nm, with the largest surface area of 1380 m²/g observed for nanoparticles sized around 170 nm. Additionally, multivariate control chart analysis is performed to quantitatively evaluate the individual and combined effects of these parameters on morphology. This analysis suggests that the molar ratio is the most significant factor affecting the size, providing insights into the morphology optimization of ZIF-8 for different applications.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113588"},"PeriodicalIF":4.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143591989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of Raman spectroscopy and chemometrics in the mechanochemical synthesis of TIFSIX-3-Ni HUMs using twin screw extrusion","authors":"Ahmed Metawea ,&nbsp;Ahmad B. Albadarin ,&nbsp;Ozren Jovic ,&nbsp;Nicolas Abdel Karim Aramouni ,&nbsp;Gavin Walker ,&nbsp;Rabah Mouras","doi":"10.1016/j.micromeso.2025.113558","DOIUrl":"10.1016/j.micromeso.2025.113558","url":null,"abstract":"<div><div>Hybrid ultra-microporous materials (HUMs) are a novel category of porous materials featuring a distinctive 3D structure composed of square lattice layers. In this study, HUMs was produced on a small scale using either solvothermal or ball milling synthesis methods. Building on the successful synthesis of HUMs via ball milling, twin-screw extrusion (TSE) appears to be a suitable method for large-scale and potentially continuous synthesis. The effect of process parameters, such as feeding rate, screw speed, barrel temperature, and liquid-to-solid ratio L/S (m/m), on the properties of the TIFSIX-3-Ni HUM was investigated. The results are presented in two sections: In the first section, we conducted a characterization and qualitative investigation to determine the crystallinity of the collected powder by analysing PXRD diffractograms. The second section involves a quantitative study using partial least squares (PLS) multi-variate analysis to measure the conversion rate of the HUM acquired. This was achieved by utilizing the most effective developed calibration model. The PXRD analysis revealed that the most favourable parameters for producing the HUM involve operating at 50 and 150 RPM, at L/S of 0.5 (m/v), and manually feeding. The highest yield of inactivated TIFSIX-3-Ni was 77.7 %, achieved using Raman spectroscopy combined with the PLS model for quantitative analysis This study marks the first successful continuous synthesis of HUMs and the development of a predictive model for process optimization.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"391 ","pages":"Article 113558"},"PeriodicalIF":4.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of hollow tubular polyaniline fibers and adsorption studies of sulfadiazine","authors":"Huixian Liu ,&nbsp;Guohao Zhai ,&nbsp;Nana Xue ,&nbsp;Yuxuan Ma ,&nbsp;Shanshan Wang ,&nbsp;Shuai Liu","doi":"10.1016/j.micromeso.2025.113581","DOIUrl":"10.1016/j.micromeso.2025.113581","url":null,"abstract":"<div><div>To address the problem of water pollution caused by antibiotics, hollow tubular polyaniline (PANI) was prepared using a chemical oxidation method to study the adsorption behavior of sulfadiazine (SDZ) in water. The results showed that the prepared material was hollow tubular emerald green imine-type PANI with abundant amino and imino groups and a large specific surface area, capable of high-efficiency adsorption. XRD, XPS, BET, FT-IR, and Raman demonstrated that the adsorption mechanism of the pollutants by PANI mainly involves electrostatic attraction, hydrogen-bonding adsorption, hydrophobic force interaction between benzene rings, and π-π conjugate adsorption. The adsorption behavior is more consistent with the pseudo-secondary kinetic equation, and the adsorption isotherms at different temperatures conformed to the model differently. The adsorption thermodynamic experiments showed that the adsorption of SDZ by the material was spontaneous and exothermic. The prepared PANI has excellent adsorption and removal ability for SDZ in water, and the theoretical adsorption value fitted by its Langmuir isotherm model can reach 22.39 mg/g.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113581"},"PeriodicalIF":4.8,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of a noise Algorithm–Based three-dimensional porous adsorption model of coal and study of coal-oxygen physisorption kinetics","authors":"Zhifan Song ,&nbsp;Zhiyu Dong ,&nbsp;Zhifan Lu ,&nbsp;Kaiwen Ren ,&nbsp;Peng Xie ,&nbsp;Junfeng Wang","doi":"10.1016/j.micromeso.2025.113580","DOIUrl":"10.1016/j.micromeso.2025.113580","url":null,"abstract":"<div><div>In view of the difficulty of accurately characterizing the dynamic process of coal-oxygen physisorption using existing models, this study constructed three-dimensional (3D) porous adsorption models of coal based on a noise algorithm, and the kinetics of coal oxygen physisorption was investigated based on this model. The degree of metamorphism and pore characteristics of the coal samples were determined via industrial analysis and pore structure characterization, and high-pressure isothermal adsorption experiments were carried out to determine the isothermal adsorption lines of coal oxygen at different temperatures. The experimental data were fitted to construct a mathematical model under the joint influence of temperature and pressure, and a 3D porous adsorption model for coal was constructed based on the experimental results to explore the adsorption kinetic process. Revealing that the amount of oxygen adsorbed was negatively correlated with temperature, and coal samples with less deterioration possessed larger specific surface areas and pore volumes, resulting in a stronger oxygen adsorption ability. The coal-oxygen isothermal adsorption data fitted well with the Langmuir adsorption model, and the fitted oxygen adsorption values were similar to the experimental data. Numerical simulations using the constructed models indicated that the adsorption process of oxygen on the coal particle surface could be divided into three stages: (1) the seepage stage, in which oxygen is adsorbed by the outer surface of the coal body and its surface pores; (2) the surface diffusion stage, in which oxygen diffuses to the inner region of the coal particles through their pores; and (3) the deep adsorption stage, in which oxygen is adsorbed in the deep pores of the coal particles, enabling complete adsorption. Coal-oxygen adsorption reached equilibrium in a short time, the amount of oxygen adsorbed rapidly increased during the initial stage of adsorption, approaching the maximum value at 0.4 ms, and then the adsorption rate gradually decreased into the slow adsorption stage, finally reaching equilibrium at 1.0 ms. The model results indicated that oxygen adsorption was negatively correlated with temperature and positively correlated with adsorption equilibrium pressure, which aligned with the experimental rule.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113580"},"PeriodicalIF":4.8,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic regulation of photoluminescence in covalent organic frameworks by linkages and functional groups","authors":"Lei Fang ,&nbsp;Shaoping Feng ,&nbsp;Heping Yan ,&nbsp;Na Wu ,&nbsp;Gaozhang Gou","doi":"10.1016/j.micromeso.2025.113579","DOIUrl":"10.1016/j.micromeso.2025.113579","url":null,"abstract":"<div><div>Covalent organic frameworks (COFs) provide considerable design flexibility concerning linkages and functional groups. By modulating the degree of conjugation, charge delocalization, and π-π stacking of COFs, promising photoluminescent materials can be developed. Here, we synthesized a series of 2D COFs containing aggregation-caused quenching (ACQ) groups (pyrene), and the fluorescence of the pyrene moiety was fine-tuned by varying the linkers (imine, olefin) and functional groups (‒OH, ‒OMe, ‒F). Compared to imine-based COFs, the olefin-linked COF (Olefin-COF-F) exhibited significantly enhanced photoluminescence, with ten times higher quantum efficiency than Imine-COF. Olefin-COF-F benefits from interlayer hydrogen bonding and can detect HCl <em>via</em> fluorescence turn-off behavior and showed fluorescence turn-on behavior in NaOH solutions. Coating blue light-emitting diodes with Olefin-COF-F resulted in a high-purity white-light device. This research offers valuable insights into the controlled synthesis of COF-based photoluminescent materials featuring ACQ groups.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"390 ","pages":"Article 113579"},"PeriodicalIF":4.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}