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Birgit Claes, Tom Boudewijns, Laurens Muchez, Geert Hooyberghs, Erik V Van der Eycken, Jozef Vanderleyden, Hans P Steenackers, Dirk E De Vos
Metal-organic frameworks (MOFs) have a large potential for delivery of active molecules. Here, a MOF coating is investigated as a smart host matrix for triggered release of anti-biofilm compounds. Besides a coating consisting of the regular Fe-terephthalate MIL-88B(Fe), a new hydrophobic MIL-88B(Fe) coating is synthesized in hydrothermal conditions using palmitic acid as a lattice terminating group. These porous materials are used as a host matrix for the anti-biofilm compound 5-(4-chlorophenyl)-N-(2-isobutyl)-2-aminoimidazole, which has a specific biofilm inhibiting effect at concentrations at which no activity against planktonic cells is detected...
January 12, 2017: ACS Applied Materials & Interfaces
Mohua Li, Zhenjian Zheng, Yangqiong Zheng, Cao Cui, Chunxia Li, Zhengquan Li
Development of MOF-based photocatalysts is intriguing research due to their structural flexibility and tremendous catalytic sites, whereas most MOFs only can take use of UV/visible light and lack of response to NIR light. Herein, we present a facile approach to integrate upconversion nanoparticles (UCNPs) with MOF to build a NIR-responsive composite photocatalyst. The MOF shell with controllable thickness can be grown on the UCNPs, thus exhibiting tunable photocatalytic activities under NIR irradiation. Furthermore, we extend visible absorption of the MOF shell by adding -NH2 groups so that the composite photocatalysts have a better utilization of UC emissions and sunlight to improve their activities...
January 12, 2017: ACS Applied Materials & Interfaces
Xuechuan Gao, Manjue Zhai, Weihua Guan, Jingjuan Liu, Zhiliang Liu, Alatangaole Damirin
As a result of their extraordinarily large surfaces and well-defined pores, the design of multifunctional metal-organic framework (MOF) is crucial for drug delivery while has been rarely reported. In this paper, a novel drug delivery system (DDS) based on nanoscale metal-organic framework (MOF) was developed for using in cancer diagnosis and therapy. This MOF based tumour targeting DDS was fabricated by a simple post-synthetic surface modification process. Firstly, magnetic mesoporous nanomaterial Fe-MIL-53-NH2 was devoted for encapsulating the drug and served as a magnetic resonance (MR) contrast agent...
January 12, 2017: ACS Applied Materials & Interfaces
Jitang Chen, Yang Yang, Jianwei Su, Peng Jiang, Guoliang Xia, Qianwang Chen
The hydrogen evolution reaction (HER) is highly relied on Pt-based electrocatalysts with high activity and stability. For a long time, a host of efforts have been made in the development of novel platinum nano-structures with a low amount of Pt because the scarcity and high price of Pt hinders its practical applications. Here, we report the preparation of PtCoFe@C electrocatalysts with remarkably reduced Pt loading amount of 4.60%by annealing Pt-doped metal-organic frameworks (MOFs). The electrocatalyst demonstrated an outstanding performance with only 45 mV overpotential to achieve the 10 mA cm-2 current density, which is quite close to that of the commercial 20% Pt/C catalyst...
January 12, 2017: ACS Applied Materials & Interfaces
Ruth Röder, Tobias Preiß, Patrick Hirschle, Benjamin Steinborn, Andreas Zimpel, Miriam Hoehn, Joachim O Rädler, Thomas Bein, Ernst Wagner, Stefan Wuttke, Ulrich Lächelt
Self-assembly of individual units into multicomponent complexes is a powerful approach for the generation of functional super-structures. We present the coordinative interaction of oligohistidine-tags (His-tags) with metal-organic framework nanoparticles (MOF NPs). By this novel concept, different molecular units can be anchored on the outer surface of MOF NPs in a self-assembly process generating multifunctional nanosystems. The article focuses on two main objectives: first, the detailed investigation of the assembly process and fundamental establishment of the novel functionalization concept; and second, its subsequent use for the development of biomacromolecule (e...
January 11, 2017: Journal of the American Chemical Society
Claudia Schenk, Christel Kutzscher, Franziska Drache, Stella Helten, Irena Senkovska, Stefan Kaskel
Preparation of thin-layer chromatographic (TLC) plates based on metal-organic frameworks (MOFs) as porous stationary phases is described. DUT-67 (DUT = Dresden University of Technology), a zirconium based MOF, was used in combination with a fluorescent indicator as stationary phase for analyzing a small selection of a wide spectrum of relevant analytes. The successful separation of benzaldehyde from trans-cinnamaldehyde and 4-aminophenol from 2-aminotoluene is reported as a model system using optimized eluent mixtures containing acetic acid...
January 11, 2017: ACS Applied Materials & Interfaces
Anjali Jayakumar, Rajini P Antony, Ronghua Wang, Jong-Min Lee
Highly optimized nickel cobalt mixed oxide has been derived from zeolite imidazole frameworks. While the pure cobalt oxide gives only 178.7 F g(-1) as the specific capacitance at a current density of 1 A g(-1) , the optimized Ni:Co 1:1 has given an extremely high and unprecedented specific capacitance of 1931 F g(-1) at a current density of 1 A g(-1) , with a capacitance retention of 69.5% after 5000 cycles in a three electrode test. This optimized Ni:Co 1:1 mixed oxide is further used to make a composite of nickel cobalt mixed oxide/graphene 3D hydrogel for enhancing the electrochemical performance by virtue of a continuous and porous graphene conductive network...
January 11, 2017: Small
Ang Li, Yan Tong, Bin Cao, Huaihe Song, Zhihong Li, Xiaohong Chen, Jisheng Zhou, Gen Chen, Hongmei Luo
Porous carbon is one of the most promising alternatives to traditional graphite materials in lithium-ion batteries. This is not only attributed to its advantages of good safety, stability and electrical conductivity, which are held by all the carbon-based electrodes, but also especially ascribed to its relatively high capacity and excellent cycle stability. Here we report the design and synthesis of a highly porous pure carbon material with multifractal structures. This material is prepared by the vacuum carbonization of a zinc-based metal-organic framework, which demonstrates an ultrahigh lithium storage capacity of 2458 mAh g(-1) and a favorable high-rate performance...
January 11, 2017: Scientific Reports
Aleksandr A Sapianik, Ekaterina N Zorina-Tikhonova, Mikhail A Kiskin, Denis G Samsonenko, Konstantin A Kovalenko, Alexey A Sidorov, Igor L Eremenko, Danil N Dybtsev, Alexander J Blake, Stephen P Argent, Martin Schröder, Vladimir P Fedin
The tetranuclear heterometallic complex [Li2Zn2(piv)6(py)2] (1, where piv(-) = pivalate and py = pyridine) has been successfully employed as a presynthesized node for the construction of four porous metal-organic frameworks (MOFs) [Li2Zn2(R-bdc)3(bpy)]·solv (2-R, R-bdc(2-); R = H, Br, NH2, NO2) by reaction with 4,4'-bipyridine (bpy) and terephthalate anionic linkers. The [Li2Zn2] node is retained in the products, representing a rare example of the rational step-by-step design of isoreticular MOFs based on complex heterometallic building units...
January 10, 2017: Inorganic Chemistry
Ya-Pan Wu, Guo-Wang Xu, Wen-Wen Dong, Jun Zhao, Dong-Sheng Li, Jian Zhang, Xianhui Bu
New porous anionic Ln-MOFs, namely, [Me2NH2][Ln(CPA)2(H2O)2] (Ln = Eu, Gd), have been prepared through the self-assembly of 5-(4-carboxy phenyl)picolinic acid (H2CPA) and lanthanide ions. They feature open anionic frameworks with 1-D hydrophilic channels and exchangeable dimethylamine ions. The Eu phase could detect Fe(3+) ions with high selectivity and sensitivity in either aqueous solution or biological condition. The ratios of lanthanide ions on this structure platform could be rationally tuned to not only achieve dichromatic emission colors with linear correlation but also attain three primary colors (RGB) and even white light with favorable correlated color temperature...
January 10, 2017: Inorganic Chemistry
Zhi-Wei Zhao, Tao Wen, Kuang Liang, Yi-Fan Jiang, Xiao Zhou, Cong-Cong Shen, An-Wu Xu
As the ever-growing demand for high-performance power sources, lithium-ion batteries with high storage capacities and outstanding rate performance have been widely considered as a promising storage device. In this work, starting with metal-organic frameworks (MOFs), we have developed a facile approach to the synthesis of hybrid Fe3O4/VOx hollow microboxes via the process of hydrolysis and ion exchange and subsequent calcination. In the constructed architecture, the hollow structure provides efficient lithium ions diffusion pathway and extra space to accommodate the volume expansion during the insertion and extration of Li+...
January 10, 2017: ACS Applied Materials & Interfaces
Chao-Ying Gao, Jing Ai, Hong-Rui Tian, Dai Wu, Zhong-Ming Sun
A zirconium-phosphonate network, as a bifunctional catalyst for carbon dioxide (CO2)/epoxide coupling reaction, exhibits very high activity that is superior to most documented metal-organic framework (MOF)-based catalysts. Furthermore, it possesses extraordinary tolerance to extremely harsh conditions, such as aqua regia. This paper describes the use of metal phosphonate as a new MOF applied to CO2 transformation.
January 9, 2017: Chemical Communications: Chem Comm
Avishek Karmakar, Biplab Joarder, Abhik Mallick, Partha Samanta, Aamod V Desai, Sudipta Basu, Sujit K Ghosh
A pure aqueous phase recognition and corresponding detoxification of highly toxic cyanide ions has been achieved by a fluorescent metal-organic framework (MOF). The cyanide detoxification has been shown to be effective even in in vitro studies and the MOF could be recycled to show the same efficiency of detoxification.
January 9, 2017: Chemical Communications: Chem Comm
Sudi Jawahery, Cory M Simon, Efrem Braun, Matthew Witman, Davide Tiana, Bess Vlaisavljevich, Berend Smit
IRMOF-74 analogues are among the most widely studied metal-organic frameworks (MOFs) for adsorption applications because of their one-dimensional channels and high metal density. Most studies involving the IRMOF-74 series assume that the crystal lattice is rigid. This assumption guides the interpretation of experimental data, as changes in the crystal symmetry have so far been ignored as a possibility in the literature. Here, we report a deformation pattern, induced by the adsorption of argon, for IRMOF-74-V...
January 9, 2017: Nature Communications
Yunong Li, Sha Wang, Yuan Zhou, Xiaojue Bai, Guoshuai Song, Xueying Zhao, Tieqiang Wang, Xuan Qi, Xuemin Zhang, Yu Fu
This manuscript has developed a rapid and convenient method to fabricate MOF and ICP nanosheets by spraying the atomized solution of metal ions onto the organic ligands solution. The nanosheets formation could be attributed to the anisotropic diffusion of metal ions in the ligands solution, which may give rise to a lateral interface of metal ions and organic ligands, where the crystals tend to grow laterally as the form of nanosheets. Three kinds of Zn and Cu-based MOF nanosheets and two kinds of Co-based ICP nanosheets have been successfully obtained by spray in mild conditions...
January 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Shu Zhu, Xia Lin, Peiyao Ran, Qiao Xia, Chengcheng Yang, Jiao Ma, Yingzi Fu
A novel solid-state electrochemiluminesence (ECL) "on-off" switch system for highly sensitive detection of tryptophan based on the luminescence-functionalized ruthenium metal-organic framework (Ru-MOF) nanoflowers and CdS quantum dots (CdSQDs) was described. Ru-MOF nanoflowers were prepared by a one-step solvothermal method at low temperature and characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR) spectra and fluorescence (FL) spectra...
January 3, 2017: Biosensors & Bioelectronics
Wahiduzzaman, Kelsey Allmond, John Stone, Spencer Harp, Khan Mujibur
We report the sonochemical synthesis of MOF (metal organic framework) nanoparticles of 30-200 nm in size and electrospraying of those particles on electrospun nanofibers to process a MOF-attached nanofibrous membrane. This membrane displayed significant selectivity towards CO2 and capacity of adsorbing with 4000-5000 ppm difference from a mixed gas flow of 1% CO2 and 99% N2. Applying ultrasonic waves during the MOF synthesis offered rapid dispersion and formation of crystalline MOF nanoparticles in room temperature...
December 2017: Nanoscale Research Letters
Liyu Chen, Weihao Huang, Xiujun Wang, Zhijie Chen, Xianfeng Yang, Rafael Luque, Yingwei Li
A series of crown-jewel Pd-based bimetallic nanostructures with tunable composition are fabricated inside the pores of an MOF via a hydride-induced-reduction strategy, exhibiting high activity and stability in the hydrogenation of nitrobenzene.
January 6, 2017: Chemical Communications: Chem Comm
Silvana Hurrle, Sebastian Friebe, Jonas Wohlgemuth, Christof Wöll, Jürgen Caro, Lars Heinke
Despite their huge potential for efficient molecular separation, the fabrication of membranes from metal-organic frameworks (MOFs) remains a major challenge. The powders obtained by the conventional solvothermal MOF syntheses are difficult to process and, as a result, the fabrication of well-performing, large-area MOF-based membranes is still awaiting success. Here, we demonstrate the deposition of MOF thin films suited for membrane applications by employing a step-by-step spray method. This method can be scaled up to obtain industrially relevant membrane areas; also, a continuous process is possible...
January 4, 2017: Chemistry: a European Journal
Mian Wu, Huili Ye, Faqiong Zhao, Baizhao Zeng
Metal-organic framework (MOF) membranes have received increasing attention as adsorbents, yet the defects in most membrane structures greatly thwart their capacity performance. In this work, we fabricated a novel ZnO/2-methylimidazole nanocomposite with multiple morphology by electrochemical method. The nanocomposite provided sufficient and strong anchorages for the zeolitic imidazolate frameworks-8 (ZIF-8) membrane. Thus, a crack-free and uniform MOF membrane with high performance was successfully obtained...
January 4, 2017: Scientific Reports
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