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https://www.readbyqxmd.com/read/29150064/metal-organic-frameworks-as-stationary-phase-for-application-in-chromatographic-separation
#1
REVIEW
Juan Zhang, Zilin Chen
Metal-organic frameworks (MOFs) as a subclass of coordination polymers, have attracted wide interest in various field. Herein, we focus on its application in chromatographic separation due to its excellent physical and chemical properties such as large surface area, high porosity, uniform pore sizes and structural diversity. In 2014, a review was published to summarize the most significant advances in MOFs, and their applications in separation science. The present review was an extensive update on applications of MOFs in chromatographic separation from 2014 to the present such as high-performance liquid chromatography (HPLC), capillary electrochromatography (CEC), nano-liquid chromatography (nano-LC), and gas chromatography (GC)...
October 27, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29149545/mechanical-properties-in-metal-organic-frameworks-emerging-opportunities-and-challenges-for-device-functionality-and-technological-applications
#2
REVIEW
Nicholas C Burtch, Jurn Heinen, Thomas D Bennett, David Dubbeldam, Mark D Allendorf
Some of the most remarkable recent developments in metal-organic framework (MOF) performance properties can only be rationalized by the mechanical properties endowed by their hybrid inorganic-organic nanoporous structures. While these characteristics create intriguing application prospects, the same attributes also present challenges that will need to be overcome to enable the integration of MOFs with technologies where these promising traits can be exploited. In this review, emerging opportunities and challenges are identified for MOF-enabled device functionality and technological applications that arise from their fascinating mechanical properties...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29148727/substrate-assisted-in-situ-confinement-pyrolysis-of-zeolitic-imidazolate-frameworks-to-nitrogen-doped-hierarchical-porous-carbon-nanoframes-with-superior-lithium-storage
#3
Wei Tian, Jialiang Liu, Yixian Wang, Jingyan Liu, Yanpeng Li, Mingbo Wu
Porous carbons generated from the direct pyrolysis of metal organic frameworks (MOFs) have showed great potential as a kind of promising electrode materials for lithium-ion batteries (LIBs). However, several common drawbacks, such as the inevitable structural damage during carbonization process and intrinsic micropore-dominated feature of MOFs-derived products, largely impede the exposure of active sites and mass transfer, thus usually resulting in inferior electrochemical performances. In this work, an effective and controllable approach was reported to construct nitrogen-doped hierarchical porous carbon nanoframes (N-HPCFs) through in situ pyrolysis transformation of small-sized zeolitic imidazolate frameworks (ZIFs) that are in advance combined with a two-dimensional substrate templated from g-C3N4...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148721/ratiometric-fluorescence-sensing-and-real-time-detection-of-wa-ter-in-organic-solvents-with-one-pot-synthesis-of-ru-mil-101-al-nh2
#4
Hua-Qing Yin, Jichun Yang, Xue-Bo Yin
Ratiometric fluorescence detection attracts much attention because of its decreased environment influence and easy-to-differentiate color and intensity change. Herein, a guest-encapsulation metal organic framework (MOF), Ru@MIL-NH2, is prepared with 2-aminoterephthalic acid, AlCl3, and Ru(bpy)32+ by simple one-pot method for ratiometric fluorescence sensing of water in organic solvents. The rational selection of excitation wavelength provides dual emission at 465 and 615 nm from Ru@MIL-NH2 under single excitation of 300 nm...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148701/metal-organic-framework-derived-metal-oxide-embedded-in-nitrogen-doped-graphene-network-for-high-performance-lithium-ion-batteries
#5
Zhu-Yin Sui, Pei-Ying Zhang, Meng-Ying Xu, Yuwen Liu, Zhi-Xiang Wei, Bao-Hang Han
Metal-organic frameworks (MOFs) are hybrid inorganic-organic materials that can be used as effective precursors to prepare various functional nanomaterials for energy-related applications. Nevertheless, most MOF-derived metal oxides exhibit low electrical conductivity and mechanical strain. These characteristics limit their electrochemical performance and hamper their practical application. Herein, we report a rational strategy for enhancing the lithium storage performance of MOF-derived metal oxide. The hierarchically porous Co3O4@NGN is successfully prepared by embedding ZIF-67-derived Co3O4 particles in a nitrogen-doped graphene network (NGN)...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148559/exploring-the-geometric-magnetic-and-electronic-properties-of-hofmann-mofs-for-drug-delivery
#6
Bikash Mandal, Jin Suk Chung, Sung Gu Kang
The geometric, magnetic, and electronic properties and the drug capturing abilities of Hofmann-type metal organic frameworks (MOFs) were examined using theoretical calculations. The detailed theoretical calculations predicted that the Hofmann sheet can have two different conformations, planar and twisted. The Ni-Co sheet was the most stable among the systems studied, whereas the Ni-Fe sheet was the least stable. All of the sheets were magnetic spin semiconductors, having Dirac-like and dispersionless bands, which give rise to a major spatial separation between the charge carriers upon excitation...
November 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29147706/amine-assisted-top-down-delamination-of-the-two-dimensional-metal-organic-framework-cu2-bdc-2
#7
Christel Kutzscher, André Gelbert, Sebastian Ehrling, Claudia Schenk, Irena Senkovska, Stefan Kaskel
A chemically assisted top-down method for the synthesis of MOF-nanoplates was developed applying amine based delamination agents. Applied on a well described model structure, the layered MOF Cu2(bdc)2(DMF)2 (bdc - 1,4-benzenedicarboxylate), two different strategies of amine assisted delamination turned out to be successful to obtain nanoplates. Particles with thicknesses of around 70 nm were obtained by direct delamination of crystals using octylamine. The surfactant (polyvinylpyrrolidone) assisted synthesis combined with a post-synthetic amine delamination step enabled a further reduction of the thickness of the MOF nanoplates down to 4-14 nm...
November 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29147503/hollowing-out-mofs-hierarchical-micro-and-mesoporous-mofs-with-tailorable-porosity-via-selective-acid-etching
#8
Jaehyoung Koo, In-Chul Hwang, Xiujun Yu, Subhadeep Saha, Yonghwi Kim, Kimoon Kim
We report a new strategy for the synthesis of robust hierarchical micro- and mesoporous MOFs from water stable MOFs via a selective acid etching process. The process is controlled by the size-selective diffusion of acid molecules through the MOF windows. This method enables the fine-tuning of the porosity of hierarchical MOFs, allowing for the generation of well-defined mesopores with high mesopore volume. Because of the size-selective diffusion of acid molecules, the inherent crystallinity and external morphology of the resulting MOFs are well-maintained after acid treatment...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29144731/zwitterionic-manganese-and-gadolinium-metal-organic-frameworks-as-efficient-contrast-agents-for-in-vivo-magnetic-resonance-imaging
#9
Liang Qin, Zi-Yan Sun, Kai Cheng, Shu-Wen Liu, Jian-Xin Pang, Li-Ming Xia, Wen-Hua Chen, Zhen Cheng, Jin-Xiang Chen
Two water-stable three-dimensional Mn- and Gd-based metal-organic frameworks (MOFs), {[Mn2(Cmdcp)2(H2O)2]·H2O}n (1) and {[Gd(Cmdcp)(H2O)3](NO3)·3H2O}n (2, H3CmdcpBr = N-(4-carboxy benzyl)-(3,5-dicarboxyl)pyridinium bromide), have been prepared and analyzed. In vitro magnetic resonance imaging indicated that MOFs 1 and 2 possess relaxivity r1 values of 17.50 and 13.46 mM(-1)·S(-1), respectively, which are superior to that of the control Gd-DTPA (r1 = 4.87 mM(-1)·S(-1), DTPA = diethylene triamine pentaacetate)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29141526/the-in-pancia-study-clinical-evaluation-of-gastrointestinal-dysfunction-and-failure-multiple-organ-failure-and-levels-of-citrulline-in-critically-ill-patients
#10
Nazzareno Fagoni, Simone Piva, Rosella Marino, Giovanni Chiarini, Daniela Ferrari, Eleonora Grespi, Rita Bertuetti, Silvia Barbieri, Nicola Latronico, Frank Rasulo
PURPOSE: Gastrointestinal dysfunction and failure (GID and GIF) in critically ill patients are a common, relevant, and underestimated complications in ICU patients. The aims of this study were (1) to determine plasmatic levels of citrulline, glutamine, and arginine as markers of GID/GIF in critically ill patients with or without GID/GIF with or without multiple organ failure (MOF) and (2) to assess the role of intra-abdominal hypertension in these patient groups. MATERIALS AND METHODS: This is a 1-year, monocentric (Italian hospital), prospective observational study...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/29139603/catalytic-transfer-hydrogenation-of-biomass-derived-carbonyls-over-hafnium-based-metal-organic-frameworks
#11
Avelino Corma, Pilar García-García, Sergio Rojas-Buzo
A series of highly crystalline, porous, hafnium-based metal-organic frameworks (MOFs) have shown to catalyze the transfer hydrogenation reaction of levulinic ester to produce γ-valerolactone using isopropanol as hydrogen donor and the results are compared with the zirconium-based counterparts. The role of the metal center in Hf-MOFs has been identified and reaction parameters optimized. NMR studies with isotopically labeled isopropanol evidences that the transfer hydrogenation occurs via a direct intermolecular hydrogen transfer route...
November 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29138874/using-il-6-concentrations-in-the-first-24%C3%A2-h-following-trauma-to-predict-immunological-complications-and-mortality-in-trauma-patients-a-meta-analysis
#12
REVIEW
Zhi Qiao, Weikang Wang, Luxu Yin, Peng Luo, Johannes Greven, Klemens Horst, Frank Hildebrand
PURPOSE: In previous studies, interleukin-6 (IL-6) has been shown to have a high predictive value for the development of complications and mortality after trauma; however, there is some uncertainty around these results. The aim of this meta-analysis was to assess the value of early IL-6 levels (within the first 24 h after trauma) for predicting post-traumatic complications [acute respiratory distress syndrome (ARDS), systemic inflammatory response syndrome (SIRS), sepsis, multiple organ failure (MOF), and multiple organ dysfunction syndrome (MODS)] and mortality...
November 14, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29137748/a-novel-synthesis-of-a-new-thorium-iv-metal-organic-framework-nanostructure-with-well-controllable-procedure-through-ultrasound-assisted-reverse-micelle-method
#13
Ghasem Sargazi, Daryoush Afzali, Ali Mostafavi
Reverse micelle (RM) and ultrasound assisted reverse micelle (UARM) were applied to the synthesis of novel thorium nanostructures as metal organic frameworks (MOFs). Characterization with different techniques showed that the Th-MOF sample synthesized by UARM method had higher thermal stability (354°C), smaller mean particle size (27nm), and larger surface area (2.02×10(3)m(2)/g). Besides, in this novel approach, the nucleation of crystals was found to carry out in a shorter time. The synthesis parameters of UARM method were designed by 2(k-1) factorial and the process control was systematically studied using analysis of variance (ANOVA) and response surface methodology (RSM)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137740/morphology-dependent-sensing-performance-of-dihydro-tetrazine-functionalized-mof-toward-al-iii
#14
Sayed Ali Akbar Razavi, Mohammad Yaser Masoomi, Ali Morsali
A pillared MOF, [Zn(OBA)(H2DPT)0.5].DMF (TMU-34), based on dihydro tetrazine functionalized pillar spacer (H2DPT=3,6-di(pyridin-4-yl)-1,4-dihydro-1,2,4,5-tetrazine) and V-shape dicarboxylate linker (H2OBA=4,4'-oxybis(benzoic acid)) was synthesized by reflux and ultrasonic methods. The effects of sonication time, initial concentration of reagents and sonication power on size and morphology have been optimized. This MOF has been characterized by scanning electron microscopy, FT-IR spectra, X-ray powder diffraction and N2 adsorption at 77K...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136896/hollow-mesoporous-cuco2o4-microspheres-derived-from-metal-organic-framework-a-novel-functional-materials-for-simultaneous-h2o2-biosensing-and-glucose-biofuel-cell
#15
Shiqiang Cui, Shuqing Gu, Yaping Ding, Jiangjiang Zhang, Zhen Zhang, Zongqian Hu
Hollow mesoporous CuCo2O4 (meso-CuCo2O4) microspheres were successfully synthesized by decomposing metal-organic frameworks (MOFs) as the template. The as-prepared CuCo2O4 microspheres were first simultaneously used for H2O2 biosensing and glucose biofuel cell (GFC) as the enzyme mimic. The resulting of meso-CuCo2O4 displayed not only excellent catalytic performances to H2O2 including a super-fast response time (within 2s), a super-high sensitivity (654.23 μA mM(-1) cm(-2)) and a super-low detection limit (3nM at S/N = 3) on the sensor, but also great values in GFC as anode material with an open circuit voltage of 0...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136546/multi-component-hybrid-soft-ionogels-for-photoluminescence-tuning-and-sensing-organic-solvent-vapors
#16
Jing Ma, Bing Yan
This paper tries to prepare soft ionogels through the carboxyl ion liquid (IM(+)Br(-)) as double chemical linker connecting both Bio-MOF-1 (Zn8(ad)4(BPDC)6O·2Me2NH2, BPDC=biphenyl-4,4'-dicarboxylate, Ad = adeninate) and lanthanide complexes. Among anionic Bio-MOF-1 interacts with IM(+)Br(-) through cation exchange (IM(+)) to form BMOF-IM and lanthanide ions are further introduced through the coordination to the carboxylic group of IM(+) together with Phen (1,10-phenanthroline) as assistant ligand for Ln(3+) (Ln = Eu, Tb or Eu/Tb)...
November 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29134677/hybridization-of-mofs-and-cofs-a-new-strategy-for-construction-of-mof-cof-core-shell-hybrid-materials
#17
Yongwu Peng, Meiting Zhao, Bo Chen, Zhicheng Zhang, Ying Huang, Fangna Dai, Zhuangchai Lai, Xiaoya Cui, Chaoliang Tan, Hua Zhang
The exploration of new porous hybrid materials is of great importance because of their unique properties and promising applications in separation of materials, catalysis, etc. Herein, for the first time, by integration of metal-organic frameworks (MOFs) and covalent organic frameworks (COFs), a new type of MOF@COF core-shell hybrid material, i.e., NH2 -MIL-68@TPA-COF, with high crystallinity and hierarchical pore structure, is synthesized. As a proof-of-concept application, the obtained NH2 -MIL-68@TPA-COF hybrid material is used as an effective visible-light-driven photocatalyst for the degradation of rhodamine B...
November 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29134075/antifungal-activity-of-water-stable-copper-containing-metal-organic-frameworks
#18
Supaporn Bouson, Atiweena Krittayavathananon, Nutthaphon Phattharasupakun, Patcharaporn Siwayaprahm, Montree Sawangphruk
Although metal-organic frameworks (MOFs) or porous coordination polymers have been widely studied, their antimicrobial activities have not yet been fully investigated. In this work, antifungal activity of copper-based benzene-tricarboxylate MOF (Cu-BTC MOF), which is water stable and industrially interesting, is investigated against Candida albicans, Aspergillus niger, Aspergillus oryzae and Fusarium oxysporum. The Cu-BTC MOF can effectively inhibit the growth rate of C. albicans and remarkably inhibit the spore growth of A...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133873/coordinative-alignment-of-chiral-molecules-to-control-over-the-chirality-transfer-in-spontaneous-resolution-and-asymmetric-catalysis
#19
Zhengqiang Xia, Xu Jing, Cheng He, Xiaoge Wang, Chunying Duan
The production and availability of enantiomerically pure compounds that spurred the development of chiral technologies and materials are very important to the fine chemicals and pharmaceutical industries. By coordinative alignment of enantiopure guests in the metal‒organic frameworks, we reported an approach to control over the chirality of homochiral crystallization and asymmetric transformation. Synthesized by achiral triphenylamine derivatives, the chirality of silver frameworks was determined by the encapsulated enantiopure azomethine ylides, from which clear interaction patterns were observed to explore the chiral induction principles...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133796/pd-supported-on-carbon-containing-nickel-nitrogen-and-sulfur-for-ethanol-electrooxidation
#20
Zi-Rui Yang, Shang-Qing Wang, Jing Wang, Ai-Ju Zhou, Chang-Wei Xu
Carbon material containing nickel, nitrogen and sulfur (Ni-NSC) has been synthesized using metal-organic frameworks (MOFs) as precursor by annealing treatment with a size from 200 to 300 nm. Pd nanoparticles supported on the Ni-NSC (Pd/Ni-NSC) are used as electrocatalysts for ethanol oxidation in alkaline media. Due to the synergistic effect between Pd and Ni, S, N, free OH radicals can form on the surface of Ni, N and S atoms at lower potentials, which react with CH3CO intermediate species on the Pd surface to produce CH3COO(-) and release the active sites...
November 13, 2017: Scientific Reports
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