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https://www.readbyqxmd.com/read/28820935/accelerating-palladium-nanowire-h2-sensors-using-engineered-nanofiltration
#1
Won-Tae Koo, Shaopeng Qiao, Alana F Ogata, Gaurav Jha, Ji-Soo Jang, Vivian T Chen, Il-Doo Kim, Reginald M Penner
The oxygen, O2, in air interferes with the detection of H2 by palladium (Pd)-based H2 sensors, including Pd nanowires (NWs), depressing the sensitivity and retarding the response/recovery speed in air - relative to N2 or Ar. Here, we describe the preparation of H2 sensors in which a nanofiltration layer consisting of a Zn metal-organic-framework (MOF) is assembled onto Pd NWs. Polyhedron particles of Zn based zeolite imidazole framework (ZIF-8) were synthesized on lithographically patterned Pd NWs, leading to the creation of ZIF-8/Pd NWs bi-layered H2 sensors...
August 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28820235/tio2-containing-carbon-derived-from-a-metal-organic-framework-composite-a-highly-active-catalyst-for-oxidative-desulfurization
#2
Biswa Nath Bhadra, Ji Yoon Song, Nazmul Abedin Khan, Sung Hwa Jhung
A new metal-organic framework (MOF) composite consisting of Ti- and Zn-based MOFs (ZIF-8(x)@H2N-MIL-125; in brief, ZIF(x)@MOF) was designed and synthesized. The pristine MOF [H2N-MIL-125 (MOF)]- and an MOF-composite [ZIF(30)@MOF]-derived mesoporous carbons consisting of TiO2 nanoparticles were prepared by pyrolysis (named MDC-P and MDC-C, respectively). MDC-C showed a higher surface area, larger pore sizes, and larger mesopore volumes than MDC-P. In addition, the TiO2 nanoparticles on MDC-C have more uniform shapes and sizes, and are smaller than those of MDC-P...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28820210/spiers-memorial-lecture-%C3%A2-progress-and-prospects-of-reticular-chemistry
#3
Bunyarat Rungtaweevoranit, Christian S Diercks, Markus J Kalmutzki, Omar M Yaghi
Reticular chemistry, the linking of molecular building units by strong bonds to make crystalline, extended structures such as metal-organic frameworks (MOFs), zeolitic imidazolate frameworks (ZIFs), and covalent organic frameworks (COFs), is currently one of the most rapidly expanding fields of science. In this contribution, we outline the origins of the field; the key intellectual and practical contributions, which have led to this expansion; and the new directions reticular chemistry is taking that are changing the way we think about making new materials and the manner with which we incorporate chemical information within structures to reach additional levels of functionality...
August 18, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28820194/exceptional-high-selectivity-of-hydrogen-methane-separation-on-a-phosphonate-based-mof-membrane-with-exclusion-of-methane-molecules
#4
Qipeng Yang, Liangjun Li, Weiqiang Tan, Yingjie Sun, Huanli Wang, Jiping Ma, Xuebo Zhao
A phosphonate-based metal-organic framework membrane was constructed on a porous anodic alumina membrane (PAAM) substrate for H2/CH4 separation for the first time. Owing to the ultra-micro pore windows, this membrane exhibited effective size exclusion for CH4 molecules but suitable permeance for H2 molecules, giving rise to an exceptional high H2/CH4 separation selectivity.
August 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28819640/slow-dynamics-of-electrons-at-a-metal-mott-insulator-boundary-in-an-organic-system-with-disorder
#5
Tetsuaki Itou, Eri Watanabe, Satoru Maegawa, Akiko Tajima, Naoya Tajima, Kazuya Kubo, Reizo Kato, Kazushi Kanoda
The Mott transition-a metal-insulator transition caused by repulsive Coulomb interactions between electrons-is a central issue in condensed matter physics because it is the mother earth of various attractive phenomena. Outstanding examples are high-Tc (critical temperature) cuprates and manganites exhibiting colossal magnetoresistance. Furthermore, spin liquid states, which are quantum-fluctuation-driven disordered ground states in antiferromagnets, have recently been found in magnetic systems very near the Mott transition...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28817269/the-chemistry-of-co2-capture-in-an-amine-functionalized-metal-organic-framework-under-dry-and-humid-conditions
#6
Robinson W Flaig, Thomas M Osborn Popp, Alejandro M Fracaroli, Eugene A Kapustin, Markus J Kalmutzki, Rashid M Altamimi, Farhad Fathieh, Jeffrey A Reimer, Omar M Yaghi
The use of two primary alkylamine functionalities covalently tethered to the linkers of IRMOF-74-III results in a material which can uptake CO2 at low pressures through a chemisorption mechanism. In contrast to other primary amine-functionalized solid adsorbents which uptake CO2 primarily as ammonium carbamates, we observe using solid state NMR that the major chemisorption product for this material is carbamic acid. The equilibrium of reaction products also shifts to ammonium carbamate when water vapor is present; a new finding that has impact on control of the chemistry of CO2 capture in MOF materials and one that highlights the importance of geometric constraints and the mediating role of water within the pores of MOFs...
August 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28817257/cation-anion-arrangement-patterns-in-self-assembled-pd2l4-and-pd4l8-coordination-cages
#7
Guido H Clever, Philip Punt
Compounds featuring one-dimensional regular arrangements of stacked metal complexes and alternating [cation-anion]∞ sequences have raised considerable interest owing to their peculiar electronic and optical properties as well as guest inclusion capabilities. While traditional ways to realize these structural motifs rely on crystalline compounds, exclusively existing in the solid state, recent progress in the area of metal-mediated supramolecular self-assembly allows for the rational synthesis of structurally well-defined short stretches of stacked metal complexes and cation-anion arrangements...
August 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28816377/controlled-growth-of-metal-organic-frameworks-on-polymer-brushes
#8
Liman Hou, Mingdong Zhou, Xiaozhe Dong, Lei Wang, Zhigang Xie, Dewen Dong, Ning Zhang
Polymer brushes are for the first time used to induce the synthesis of metal-organic frameworks (MOFs). The semi-fixed polymer chains provide a confined environment, which allows a mild growth of MOFs in-between polymer chains to give surface-attached spherical MOF nanoparticles, in contrast to the larger MOF cubics/plates formed simultaneously in solution. Polymer brushes bearing carboxylate acid functionalities are indispensible for the formation of surface bound MOFs, while no MOF nanoparticles are observed on neutral polymer brushes...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28815774/excitonically-coupled-states-in-crystalline-coordination-networks
#9
Ritesh Haldar, Antoine Mazel, Reetu Joseph, Michael Adams, Ian Howard, Bryce Richards, Manuel Tsotsalas, Engelbert Redel, Stephane Diring, Fabrice Odobel, Christof Wöll
When chromophores are brought into close proximity, noncovalent interactions (π-π/CH-π) can lead to the formation of excitonically coupled states, which bestow new photophysical properties upon the aggregates. Since the properties of the new states not only depend on the strength of intermolecular interactions, but also on the relative orientation, supramolecular assemblies, where these parameters can be varied in a deliberate fashion, provide novel possibilities for the control of photophysical properties...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28813058/fine-tuning-of-catalytic-and-sorption-properties-of-metal-organic-frameworks-via-in-situ-ligand-exchange
#10
Peng Wang, Kai Chen, Qing Liu, Huai-Wei Wang, Mohammad Azam, Saud I Al-Resayes, Yi Lu, Wei-Yin Sun
Metal-organic frameworks (MOFs) are gaining considerable attention not only because of their diverse structures but also due to their interesting properties and potential applications. However, fabrication of MOFs with desired structures and properties remains a great challenge. In this study, a strategy based on ligand exchange via single-crystal-to-single-crystal (SCSC) transformation has been undertaken, which can be used to achieve MOFs not available by direct synthesis and also to enrich the family of isoreticular MOFs...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28812873/ultrathin-manganese-based-metal-organic-framework-nanosheets-low-cost-and-energy-dense-lithium-storage-anodes-with-the-coexistence-of-metal-and-ligand-redox-activities
#11
Chao Li, Xiaoshi Hu, Wei Tong, Wensheng Yan, Xiaobing Lou, Ming Shen, Bingwen Hu
We herein demonstrate the fabrication of Mn- and Ni-based ultrathin metal-organic framework nanosheets with the same coordination mode (defined as 'Mn-UMOFNs' and 'Ni-UMOFNs', respectively) through an expedient and versatile ultrasonic approach, and scrutinize their electrochemical properties as anode materials for rechargeable lithium battery for the first time. The obtained Mn-UMOFNs with structure advantages over Ni-UMOFNs (thinner nanosheets, smaller metal-ion radius, higher specific surface area) exhibit high reversible capacity (1187 mAh g-1 at 100 mA g-1 for 100 cycles), excellent rate capability (701 mAh g-1 even at 2 A g-1), rapid Li+ diffusion coefficient (2...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809554/a-dual-photochemically-active-molecule-showing-distributable-reactivity-based-on-anion-assisted-coordination-assembly
#12
Ya-Jun Zhang, Cheng Chen, Li-Xuan Cai, Xiao-Dong Yang, Jie Zhang
Distributable reactivity of a dual photochemically active molecule functionalized by a carboxyl coordination unit has been achieved based on anion-assisted coordination assembly. The anions induce the photoactive ligand to align at different orientations in three-dimensional metal-organic frameworks, thus allowing the supramolecular systems to show photocycloaddition with simultaneous luminescence transformation or undergo photoinduced electron transfer accompanied by coloration-decoloration under alternating light and thermal stimuli...
August 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28809503/synthesis-of-denser-energetic-metal-organic-frameworks-via-a-tandem-anion-ligand-exchange-strategy
#13
Jichuan Zhang, Hui Su, Yalu Dong, Pengcheng Zhang, Yao Du, Shenghua Li, Michael Gozin, Siping Pang
High-density materials have attracted extensive attention because of their broad applications. However, strategies for improving the densities of MOFs and preparing denser MOFs remain almost unexplored. Herein, we propose a tandem anion-ligand exchange strategy for synthesizing denser MOFs by using three-dimensional cationic MOFs (3D CMOFs) with pillared layered structures as precursors and high-density anions and small monotopic ligands as exogenous guests. By means of this strategy, we choose the high-density nitroformate ion [C(NO2)3(-)] as an exogenous anion and water as an exogenous ligand to successfully synthesize two layered CMOFs...
August 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28809112/mofs-for-the-sensitive-detection-of-ammonia-deployment-of-fcu-mof-thin-films-as-effective-chemical-capacitive-sensors
#14
Ayalew Hussen Assen, Omar Yassine, Osama Shekhah, Mohamed Eddaoudi, Khaled N Salama
This work reports on the fabrication and deployment of a select metal-organic framework (MOF) thin film as an advanced chemical capacitive sensor for the sensing/detection of ammonia (NH3) at room temperature. Namely, the MOF thin film sensing layer consists of a rare-earth (RE) MOF (RE-fcu-MOF) deposited on a capacitive interdigitated electrode (IDE). Purposely, the chemically stable naphthalene-based RE-fcu-MOF (NDC-Y-fcu-MOF) was elected and prepared/arranged as a thin film on a pre-functionalized capacitive IDE via the solvothermal growth method...
August 15, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28809067/in-situ-fabrication-of-mof-derived-co-co-layered-double-hydroxide-hollow-nanocages-graphene-composite-a-novel-electrode-material-with-superior-electrochemical-performance
#15
Xue Bai, Jingyuan Liu, Qi Liu, Rongrong Chen, Xiaoyan Jing, Bin Li, Jun Wang
Rational design of transition metal layered double hydroxide and graphene composite are vital important for designing high-performance supercapacitor electrodes. Although various methods have been performed, however, the realization of high-performance is still impeded by the agglomeration of graphene and layered double hydroxide. Here, metal-organic frameworks derived cobalt-cobalt layered double hydroxide (Co-Co LDH) hollow nanocages uniformly deposited on graphene nanosheets, are fabricated via facile in-situ co-deposition and thermal ion-exchange reaction...
August 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28805847/probing-nanoscale-functionalities-of-metal-organic-framework-nanocrystals
#16
Yao Sun, Zhigang Hu, Dan Zhao, Kaiyang Zeng
Experimental investigation of functional properties of metal-organic frameworks (MOFs) at nanoscale precision is challenging and rarely reported. In this study, we report the piezo- and ferroelectric properties of NUS-6 MOF nanocrystals using dual AC resonance tracking piezoresponse force microscopy and piezoresponse force spectroscopy for the first time. Both NUS-6-(Hf) and NUS-6-(Zr) nanocrystals displayed anomalous piezoelectricity with the calculated piezoelectric coefficient dzz constants of 2.0-3.5 pm V(-1) and 1...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805700/bilp-19-an-ultramicroporous-organic-network-with-exceptional-carbon-dioxide-uptake
#17
Christoph Klumpen, Florian Radakovitsch, Andreas Jess, Jürgen Senker
Porous benzimidazole-based polymers (BILPs) have proven to be promising for carbon dioxide capture and storage. The polarity of their chemical structure in combination with an inherent porosity allows for adsorbing large amounts of carbon dioxide in combination with high selectivities over unpolar guest molecules such as methane and nitrogen. For this reason, among purely organic polymers, BILPs contain some of the most effective networks to date. Nevertheless, they are still outperformed by competitive materials such as metal-organic frameworks (MOFs) or metal doped porous polymers...
August 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28801872/new-hybrid-nanocomposite-of-copper-terephthalate-mof-graphene-oxide-synthesis-characterization-and-application-as-adsorbents-for-toxic-metal-ion-removal-from-sungun-acid-mine-drainage
#18
Esmaeil Rahimi, Neda Mohaghegh
The application of a hybrid Cu(tpa).GO (Cu(tpa) copper terephthalate metal organic framework, GO graphene oxide) composite as a new adsorbent for the removal of toxic metal ions was reported. New hybrid nanocomposite with excellent dispersibility and stability was successfully fabricated by the simple and effective ultrasonication method. The synthesized composite was characterized by scanning electron microscopy (SEM), UV-Vis and Fourier-transform infrared (FT-IR) techniques. The characterization results concluded that the binding mechanism of the Cu(tpa) and GO was related to both π-π packing and hydrogen bonding...
August 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28800219/machine-learning-using-combined-structural-and-chemical-descriptors-for-prediction-of-methane-adsorption-performance-of-metal-organic-frameworks-mofs
#19
Maryam Pardakhti, Ehsan Moharreri, David Wanik, Steven L Suib, Ranjan Srivastava
Using molecular simulation for adsorbent screening is computationally expensive and thus prohibitive to material discovery. Machine learning (ML) algorithms trained on fundamental material properties can potentially provide quick and accurate methods for screening purposes. Prior efforts have focused on structural descriptors for use with ML. In this work, the use of chemical descriptors, in addition to structural descriptors, was introduced for adsorption analysis. Evaluation of structural and chemical descriptors coupled with various ML algorithms, including decision trees, Poisson regression, support vector machine and random forest, were carried out to predict methane uptake on hypothetical metal organic frameworks...
August 11, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28799604/versatile-nio-mesoporous-carbon-nanodisks-controlled-synthesis-from-hexagon-shaped-heterobimetallic-metal-organic-frameworks
#20
Dehong Zeng, Ying Yang, Feng Yang, Fangmin Guo, Senjie Yang, Baijun Liu, Shijie Hao, Yang Ren
Hexagonal NiO/mesoporous carbon nanodisks (NiO/MCN) are facilely and controllably synthesized via constructing nickel-zinc trimesic acid heterobimetallic metal-organic framework (HMOF) disks before pyrolysis at 910 °C. Tailoring the Ni/(Zn + Ni) feed ratio and the reaction time during the HMOF synthesis creates a well-defined hexagonal carbon nanodisk with properly populated NiO nanocrystals while maintaining high porosity and conductivity. Such an elaborately fabricated NiO/MCN is highly stable, and exhibits the largest specific capacitance of 261 F g(-1) and the highest specific activity factor of 1...
August 11, 2017: Nanoscale
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