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https://www.readbyqxmd.com/read/28345810/an-untrodden-path-versatile-fabrication-of-self-supporting-polymer-stabilized-percolation-membranes-pspms-for-gas-separation
#1
Sebastian Friebe, Alexander Mundstock, Daniel Schneider, Jürgen Caro
The preparation and scalability of zeolite or MOF membranes remains a major challenge, thus preventing the application of these materials in large-scale gas separation. Additionally, several zeolite or MOF materials are quite difficult or nearly impossible to grow as defect-free layers and require expensive macroporous ceramic or polymer supports. Here, we present a new approach for self-supporting zeolite and MOF composite membranes, called Polymer-Stabilized Percolation Membranes (PSPMs) consisting of a pressed gas selective percolation network - in our case ZIF-8, NaX and MIL-140 - and a gas impermeable infiltrated epoxy resin for cohesion...
March 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28345708/evaluation-of-two-and-three-dimensional-electrode-platforms-for-the-electrochemical-characterization-of-organometallic-catalysts-incorporated-in-non-conducting-metal-organic-frameworks
#2
Edgar Mijangos, Souvik Roy, Sonja Pullen, Reiner Lomoth, Sascha Ott
The development of a reliable platform for the electrochemical characterization of a redox-active molecular diiron complex, [FeFe], immobilized in a non-conducting metal organic framework (MOF), UiO-66, based on glassy-carbon electrodes is reported. Voltammetric data with appreciable current responses can be obtained by the use of multiwalled carbon nanotubes (MWCNT) or mesoporous carbon (CB) additives that function as conductive scaffolds to interface the MOF crystals in "three-dimensional" electrodes. In the investigated UiO-66-[FeFe] sample, the low abundance of [FeFe] in the MOF and the intrinsic insulating properties of UiO-66 prevent charge transport through the framework, and consequently, only [FeFe] units that are in direct physical contact with the electrode material are electrochemically addressable...
March 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28345204/insight-into-ion-transfer-through-the-sub-nanometer-channels-in-zeolitic-imidazolate-frameworks
#3
Ze-Yu Jiang, Hai-Ling Liu, Saud Asif Ahmed, Sumaira Hanif, Shi-Bin Ren, Jing-Juan Xu, Hong-Yuan Chen, Xing-Hua Xia, Kang Wang
A crack-free sub-nanometer composite structure for the study of ion transfer was constructed by in situ growth of ZIF-90 [Zn(ICA)2 , ICA=Imidazole-2-carboxaldehyde] on the tip of a glass nanopipette. The potential-driven ion transfer through the sub-nanometer channels in ZIF-90 is strongly influenced by the pH of the solution. A rectification ratio over 500 is observed in 1 m KCl solution under alkaline conditions (pH 11.58), which is the highest value reported under such a high salt concentration. Fluorescence experiments show the super-high rectification ratio under alkaline conditions results from the strong electrostatic interaction between ions and the sub-nanometer channels of ZIF-90...
March 27, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28343394/metal-organic-nanosheets-formed-via-defect-mediated-transformation-of-a-hafnium-metal-organic-framework
#4
Matthew J Cliffe, Elizabeth Castillo-Martinez, Yue Wu, Jeongjae Lee, Alexander C Forse, Francesca C N Firth, Peyman Z Moghadam, David Fairen-Jimenez, Michael W Gaultois, Joshua A Hill, Oxana V Magdysyuk, Ben Slater, Andrew L Goodwin, Clare P Grey
We report a hafnium containing MOF, hcp UiO-67(Hf), which is a defective layered analogue of the face-centered cubic fcu UiO-67(Hf). hcp UiO-67 accommodates its low- ered ligand:metal ratio compared to fcu UiO-67 through a new structural mechanism: the formation of a condensed 'double cluster', analogous to the condensation of coor- dination polyhedra in oxide frameworks. In oxide frameworks variable stoichiometry can lead to more complex defect structures, e.g. crystallographic shear planes or mod- ules with differing compositions, which can be the source of further chemical reactivity; likewise the layered hcp UiO-67 can react further to form two-dimensional nanosheets...
March 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28340737/efficient-extraction-of-low-abundance-peptides-from-digested-proteins-and-simultaneous-exclusion-of-large-sized-proteins-with-novel-hydrophilic-magnetic-zeolitic-imidazolate-frameworks
#5
Man Zhao, Yiqin Xie, Hemei Chen, Chunhui Deng
Zeolitic imidazolate frameworks (ZIFs) are composed of tetrahedral transition metal ions and imidazolate type organic linkers. This kind of metal organic frameworks (MOFs) combines the unique properties of both zeolites and MOFs. Furthermore, ZIFs can be assembled under mild biocompatible conditions. These advantages make them be primarily studied for biochemical analysis. In this work, polydopamine-modified hydrophilic magnetic ZIFs were synthesized in a simple and mild way for the efficient extraction of low-abundance peptides...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340736/highly-sensitive-electrochemical-sensor-for-chloramphenicol-based-on-mof-derived-exfoliated-porous-carbon
#6
Lili Xiao, Ruiyu Xu, Qunhui Yuan, Fu Wang
Benefit from the advantages in costless, simplicity and efficiency, solvent exfoliation has been widely used in preparation of two-dimensional nanosheets with enhanced performances in electronics, photonics, and catalysis. In this work, solvent exfoliation was first applied to prepare exfoliated porous carbon (EPC) from an isoreticular metal-organic framework-8 (IRMOF-8) derived porous carbon (DPC). The obtained EPC with high surface area (1854m(2)g(-1)) and improved dispersibility was used as electrode modifier for glassy carbon electrode (GCE) in square wave voltammetry (SWV) detection of chloramphenicol (CAP)...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340735/facile-visual-colorimetric-sensor-based-on-iron-carbide-nanoparticles-encapsulated-in-porous-nitrogen-rich-graphene
#7
Siyuan Wu, Hao Huang, Xun Feng, Cuicui Du, Wenbo Song
Herein, via one-step pyrolysis of glucose, dicyandiamide (DCDA) and Fe containing metal-organic framework (Fe-MOF), small Fe3C nanoparticles were in-situ decorated in 3D porous network of N-rich graphene (NGr). The Fe-MOF served as size regulating precursor, layered g-C3N4 (derived from pyrolysis of DCDA) acted as not only a template to guide the growth of small Fe3C nanoparticles, but also the carbon source for 3D porous NGr network. The intrinsic peroxidase-like catalytic activity of Fe3C/NGr was unpredictably discovered, by taking the oxidation reaction of 3,3',5,5'-tetramethylbenzidine (TMB) with H2O2 as a protocol...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28338695/unprecedented-highly-efficient-capture-of-glycopeptides-by-fe3o4-mg-mof-74-core-shell-nanoparticles
#8
Jie Li, Jiaxi Wang, Yun Ling, Zhenxia Chen, Mingxia Gao, Xiangmin Zhang, Yaming Zhou
Magnetic Fe3O4 nanospheres coated with Mg-MOF-74 have been facilely prepared via epitaxial growth. Owing to the intrinsic hydrophilic pore surface and size-exclusive properties of Mg-MOF-74, the Fe3O4@Mg-MOF-74 core-shell nanoparticles show effective and selective enrichment of 441 N-glycosylation sites of 418 glycopeptides from 125 glycoproteins in 1 μL of human serum.
March 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28338319/postmetalated-zirconium-metal-organic-frameworks-as-a-highly-potent-bactericide
#9
Boushra Mortada, Tamara Abou Matar, Aya Sakaya, Hala Atallah, Zeinab Kara Ali, Pierre Karam, Mohamad Hmadeh
Metal-organic frameworks (MOFs) have emerged as an important class of hybrid organic-inorganic materials. One of the reasons they have gained remarkable attention is attributed to the possibility of altering them by postsynthetic modification, thereby providing access to new and novel advanced materials. MOFs have been applied in catalysis, gas storage, gas separation, chemical sensing, and drug delivery. However, their bactericidal use has rarely been explored. Herein, we developed a two-step process for the synthesis of zirconium-based MOFs metalated with silver cations as a potent antibacterial agent...
March 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28338128/metal-organic-and-covalent-organic-frameworks-as-single-site-catalysts
#10
REVIEW
S M J Rogge, A Bavykina, J Hajek, H Garcia, A I Olivos-Suarez, A Sepúlveda-Escribano, A Vimont, G Clet, P Bazin, F Kapteijn, M Daturi, E V Ramos-Fernandez, F X Llabrés I Xamena, V Van Speybroeck, J Gascon
Heterogeneous single-site catalysts consist of isolated, well-defined, active sites that are spatially separated in a given solid and, ideally, structurally identical. In this review, the potential of metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) as platforms for the development of heterogeneous single-site catalysts is reviewed thoroughly. In the first part of this article, synthetic strategies and progress in the implementation of such sites in these two classes of materials are discussed...
March 24, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28337807/a-strategy-for-breaking-polyoxometalate-based-mofs-to-obtain-high-loading-amount-of-nanosized-polyoxometalate-clusters-to-improve-the-performance-of-dye-sensitized-solar-cells
#11
Xiaotao Zheng, Weilin Chen, Li Chen, Yijing Wang, Xiangwei Guo, Jiabo Wang, En-Bo Wang
Polyoxometalate (POM) has already been confirmed to act as an effective electron-transfer mediator for improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) based on our studies. However, it may be limited by the agglomeration of the polyoxoanions. In this paper, we improve our previous synthesis strategy by breaking the MOFs with POMs as the secondary building units ([Ni(bpp)(H2O)2]3[P2W18O62]·24H2O(1) and H6[Cu3(H2O)6(P2W18O62)2(3-dpye)6]·28H2O (2)) to design and synthesize small-size and high-dispersive POM nanoparticles by means of compositing with TiO2 via the calcination to remove the organic ligand...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28334522/microwave-assisted-morphology-evolution-of-fe-based-metal-organic-frameworks-and-their-derived-fe2o3-nanostructures-for-li-ion-storage
#12
Wenxiang Guo, Weiwei Sun, Li-Ping Lv, Shaofeng Kong, Yong Wang
Metal-organic-framework (MOF) approach is demonstrated as an effective strategy for the morphology evolution control of MIL-53(Fe) with assistance of microwave irradiation. Owing to the homogenous nucleation offered by microwave irradiation and confined porosity and skeleton by MOF templates, various porous Fe2O3 nanostructures including spindle, concave octahedron, solid octahedron, yolk-shell octahedron, and nanorod with porosity control are derived by simply adjusting irradiation time. The formation mechanism for the MOF precursors and their derived iron oxides with morphology control are investigated...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28334498/multi-shelled-hollow-metal-organic-frameworks
#13
Wenxian Liu, Jijiang Huang, Qiu Yang, Shiji Wang, Xiaoming Sun, Weina Zhang, Junfeng Liu, Fengwei Huo
Hollow metal-organic frameworks (MOFs) are promising materials with sophisticated structures, such as multiple shells, that cannot only enhance the properties of MOFs but also endow them with new functions. Herein, we show a rational strategy to fabricate multi-shelled hollow chromium (III) terephthalate MOFs (MIL-101) with single-crystalline shells through step-by-step crystal growth and subsequent etching processes. This strategy relies on the creation of inhomogeneous MOF crystals in which the outer layer is chemically more robust than the inner layer and can be selectively etched by acetic acid...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28332693/an-electron-transfer-photochromic-crystalline-mof-accompanying-photoswitchable-luminescence-in-a-host-guest-system
#14
Yu-Shuang Liu, Yu-Hui Luo, Li Li, Hong Zhang
A new electron transfer type photoactive host-guest supramolecule was constructed by introducing (CH3)2NH2(+) cations to the MOF framework. The resulting compound 1 exhibits reversible photochromic property without using photochromic components, resulting from photoinduced electron-transfer between the electron-rich anionic framework and the electron-deficient guest ions. In addition, a photoluminescence "on/off switch" occurs during the coloration-decoloration process. The raw materials are non-poisonous and harmless, hence compound 1 may be more cost-effective, clean, and harmless to the heath than existing photochromic materials...
March 23, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28332680/templated-and-template-free-fabrication-strategies-for-zero-dimensional-hollow-mof-superstructures
#15
Hyehyun Kim, Myoung Soo Lah
Various fabrication strategies for hollow metal-organic framework (MOF) superstructures are reviewed and classified using various types of external templates and their properties. Hollow MOF superstructures have also been prepared without external templates, wherein unstable intermediates obtained during reactions convert to the final hollow MOF superstructures. Many hollow MOF superstructures have been fabricated using hard templates. After the core-shell core@MOF structure was prepared using a hard template, the core was selectively etched to generate a hollow MOF superstructure...
March 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28328220/shock-wave-chemistry-in-a-metal-organic-framework
#16
Zhi Su, William L Shaw, Yu-Run Miao, Sizhu You, Dana D Dlott, Kenneth S Suslick
Metal-organic frameworks (MOFs) have potential applications as energy absorbing materials for shock wave energy mitigation due to their nanoporosity. Here we have examined km/s laser-driven flyer plate impacts on a prototypical MOF, ZIF-8. We observed particle fragmentation and morphological changes in microcrystals of ZIF-8 at lower shock pressures (≈2.5 GPa), and amorphization and structural collapse at higher pressures (≈8 GPa). High-speed emission spectroscopy revealed that 50 ns after flyer plate impacts, an emission pulse was generated by ZIF-8 resulting from chemical bonds that were broken and subsequently reformed...
March 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28328219/energy-storage-during-compression-of-metal-organic-frameworks
#17
Yu-Run Miao, Zhi Su, Kenneth S Suslick
Practical applications of metal-organic framework (MOF) materials require an in-depth understanding of their mechanical properties. We have investigated the mechanical properties and energy absorption behavior of single crystals of four isostructural UiO-type MOFs under uniaxial compression. In situ nanocompression experiments were used to measure the mechanical behavior of individual MOF nanocrystals under compression within a transmission electron microscope. The plasticity and endothermicity during deformation of MOFs shows a surprising potential for absorption and dissipation of mechanical shock...
March 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28328214/proton-conductance-of-a-superior-water-stable-metal-organic-framework-and-its-composite-membrane-with-poly-vinylidene-fluoride
#18
Hong-Bin Luo, Mei Wang, Shao-Xian Liu, Chen Xue, Zheng-Fang Tian, Yang Zou, Xiao-Ming Ren
Proton-exchange membranes (PEMs) as separators have important technological applications in electrochemical devices, including fuel cells, electrochemical sensors, electrochemical reactors, and electrochromic displays. The composite membrane of a proton-conducting metal-organic framework (MOF) and an organic polymer combines the unique physical and chemical nature of the polymer and the high proton conductivity of the MOF, bringing together the best of both components to potentially fabricate high-performance PEMs...
March 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28327728/in-situ-fe2n-n-doped-porous-carbon-hybrids-as-superior-catalysts-for-oxygen-reduction-reaction
#19
Xiaoxiao Huang, Ziyu Yang, Bing Dong, Yazhou Wang, Tianyu Tang, Yanglong Hou
Developing efficient and economical noble-metal free catalysts for oxygen reduction reaction (ORR) is one of the essential factors for the industrialization of fuel cells. Recent studies on transition metal ORR catalysts have become the priority to practical low-temperature fuel cells. Herein, we proposed a novel in situ design, Fe2N nanoparticles (NPs) in an N doped porous carbon matrix (Fe2N@NPC) derived from metal organic frameworks (MOFs) as high-performance ORR catalysts. The decorated Fe2N NPs increase the amount of Fe-N/C bonding as catalytic site...
March 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28327599/metal-organic-framework-templated-synthesis-of-ultrasmall-catalyst-loaded-zno-znco2o4-hollow-spheres-for-enhanced-gas-sensing-properties
#20
Won-Tae Koo, Seon-Jin Choi, Ji-Soo Jang, Il-Doo Kim
To achieve the rational design of nanostructures for superior gas sensors, the ultrasmall nanoparticles (NPs) loaded on ternary metal oxide (TMO) hollow spheres (HS) were synthesized by using the polystyrene (PS) sphere template and bimetallic metal-organic framework (BM-MOFs) mold. The zinc and cobalt based zeolite imidazole frameworks (BM-ZIFs) encapsulating ultrasmall Pd NPs (2-3 nm) were assembled on PS spheres at room temperature. After calcination at 450 °C, these nanoscale Pd particles were effectively infiltrated on the surface of ZnO/ZnCo2O4 HSs...
March 22, 2017: Scientific Reports
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