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Reticular exploration of uranium-based metal-organic frameworks with hexacarboxylate building units

Nano Research 2021年第2期14卷 376-380页

作者： Zhijie Chen Penghao Li Xuan Zhang Mohammad Rasel Mian Xingjie Wang Peng Li Zhichang Liu Michael O’keeffe J.Fraser Stoddart omar k.farha Department of Chemistry and International Institute for Nanotechnology Northwestern University2145 Sheridan RoadEvanstonIllinois 60208USA School of Molecular Sciences Arizona State UniversityTempeArizona 85287USA Institute for Molecular Design and Synthesis Tianjin University92 Weijin RoadTianjin 300072China School of Chemistry University of New South WalesSydneyNSW 2052Australia Department of Chemical&Biological Engineering Northwestern UniversityEvanstonIllinois 60208USA

The rational reticular design of metal-organic frameworks(MOFs)from building units of known geometries is essential for enriching the diversity of MOF *** and intriguing structures,however,can also arise from subtle changes in the rigidity/length of organic linkers and/or synthetic ***,we report three uranium-based MOF structures—i.e.,NU-135X(X=0,1,2)—synthesized from trigonal planar uranyl nodes and triptycene-based hexacarboxylate ligands with variable arm lengths.A new chiral 3,6-connected nuc net was observed in NU-1350,while the extended versions of the ligand led to 3-fold catenated MOFs(NU-1351 and NU-1352)with rare 3,6-connected cml-c3 *** differences in the topology of NU-1350 and NU-1351/NU-1352 could be attributed to the slight distortions of the shorter linker in the former from the ideal trigonal prism geometry to an octahedral geometry when coordinated to the trigonal planar uranyl nodes.

关键词： reticular chemistry uranium-based m etal-organic frameworks(MOFs) hexacarboxylate 3 6-connected net catenation actinide

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Protection against Chemical Warfare Agents and Biological Threats Using Metal−Organic Frameworks as Active Layers

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Accounts of Materials Research 2023年第2期4卷 168-179页

作者： kaikai Ma Yuk Ha Cheung kent O.kirlikovali Xiaoliang Wang Timur Islamoglu John H.Xin omar k.farha International Institute for Nanotechnology Institute for Sustainability and Energy at Northwesternand Department of ChemistryNorthwestern UniversityEvanstonIllinois 60208United States Research Centre for Smart Wearable Technology School of Fashion and TextilesThe Hong Kong Polytechnic UniversityKowloon 999077 Hong Kong SARP.R.China

The SARS-CoV-2 pandemic outbreak and the unfortunate misuse of toxic chemical warfare agents(CWAs)highlight the importance of developing functional materials to protect against these chemical and pathogen ***−organic frameworks(MOFs),which comprise a tunable class of crystalline porous materials built from inorganic nodes and organic linkers,have emerged as a class of heterogeneous catalysts capable of rapid detoxification of multiple classes of these harmful chemical or biological *** particular,zirconium-based MOFs(Zr-MOFs)feature Lewis acidic nodes that serve as active sites for a wide range of catalytic reactions,including the hydrolysis of organophosphorus nerve agents within seconds in basic aqueous *** addition,postsynthetic modification of Zr-MOFs enables the release of active species capable of reacting with and deactivating harmful *** this impressive performance,utilizing Zr-MOFs in powder form is not practical for application in masks or protective *** address this challenge,our team sought to develop MOF/fiber composite systems that could be adapted for use under realistic operating conditions to protect civilians,military personnel,and first responders from harmful pathogens and chemical warfare *** the last several years,our group has designed and fabricated reactive and biocidal MOF/fiber composites that effectively capture and deactivate these toxic *** this Account,we describe the evolution of these porous and reactive MOF/fiber composites and focus on key design challenges and ***,we devised a scalable method for the integration of Zr-MOFs onto textile substrates using aqueous precursor solutions and without using pretreated textiles,highlighting the potential scalability of this *** beyond standard textiles,we also developed a microbial synthesis strategy to prepare hierarchically porous MOF/bacterial cellulose nanofiber composite sponges that can both captu

关键词： composites protective porous

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Growth of ZnO self-converted 2D nanosheet zeolitic imidazolate framework membranes by an ammoniaassisted strategy

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Nano Research 2018年第4期11卷 1850-1860页

作者： Yujia Li Lu Lin Min Tu Pei Nian Ashlee J. Howarth omar k. farha Jieshan Qiu Xiongfu Zhang State key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 China International Institute for Nanotechnology Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA Center for Surface Chemistry and Catalysis KU Leuven-University ofLeuven Leuven Belgium Department of Chemistry Faculty of Science King Abdulaziz University Jeddah Saudi Arabia

Shaping crystalline porous materials such as metal organic frameworks （MOFs） and zeolites into two-dimensional （2D） nanosheet forms is highly desirable for developing high-performance molecular sieving membranes. However, conventional exfoliation-deposition is complex and challenging for the large-scale fabrication of nanosheet MOF tubular membranes. Here, for the first time, we report a direct growth technique by ZnO self-conversion and ammonia assistance to fabricate zeolitic imidazolate framework （ZIF） membranes consisting of 2D nanosheets on porous hollow fiber substrates; the membranes are suitable for large-scale industrial gas separation processes. The proposed fabrication process for ZIF nanosheet membranes is based on the localized self-conversion of a pre-deposited thin layer of ZnO in a ligand solution containing ammonium hydroxide as a modulator. The resulting ZIF 2D nanosheet tubular membrane is highly oriented and only 50 nm in thickness. It exhibits excellent molecular sieving performance, with high H2 permeance and selectivity for H2/CO2 separation. This technique shows great promise in MOF nanosheet membrane fabrication for large-scale molecular sieving applications.

关键词： nanosheet nanosheet membrane metal organic framework membrane oriented growth gas separation

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A Comparative Study of the Phase Distribution in Carbon-Silica Hybrid Fillers for Rubber Obtained by Different Methods

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Materials Sciences and Applications 2014年第10期5卷 685-697页

作者： omar A. Al-Hartomy Ahmed A. Al-Ghamdi Said A. farha Al-Said Nikolay Dishovsky Michael B. Ward Petrunka Malinova Mihail Mihaylov Department of Physics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Physics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Physics Faculty of Science University of Tabuk Tabuk Saudi Arabia Department of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria LEMAS Institute for Materials Research SPEME University of Leeds Leeds UK

Different types of carbon-silica fillers were prepared via pyrolysis-cum-water vapor of waste green tires tread and impregnation method. Dual phase fillers have been characterized by energy dispersive X-ray (EDX) spectroscopy in a scanning transmission electron microscope (STEM) or STEM-EDX. Phase distribution in hybrid fillers for rubber was investigated. The results achieved show that the conditions of obtaining influence the distribution and the location of the phases in the carbon-silica hybrid fillers as well as their most essential characteristics including specific area, oil absorption number, iodine adsorption number, ash content and others.

关键词： Carbon Silica Hybrid Fillers Pyrolisis Impregnation Filler Characterization STEM-EDX Method

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