Read by QxMD icon Read

Mesoporous Metal Organic Framework

Dingxin Liu, Dianting Zou, Haolin Zhu, Jianyong Zhang
Metal-organic frameworks (MOFs) have attracted much attention over the past two decades due to their highly promising applications not only in the fields of gas storage, separation, catalysis, drug delivery, and sensors, but also in relatively new fields such as electric, magnetic, and optical materials resulting from their extremely high surface areas, open channels and large pore cavities compared with traditional porous materials like carbon and inorganic zeolites. Particularly, MOFs involving pores within the mesoscopic scale possess unique textural properties, leading to a series of research in the design and applications of mesoporous MOFs...
August 2, 2018: Small
Yana Liu, Cheng Zhang, Chen Xu, Caixue Lin, Keke Sun, Jie Wang, Xueli Chen, Ling Li, Andrew K Whittaker, Hai-Bing Xu
Using a facile one-step hydrothermal method, a series of metal-organic frameworks containing Gd/Tm (Gd/Tm-MOFs) were prepared successfully. Through the mutual activation of Gd3+ and Tm3+, Gd/Tm-MOFs showed unexpected excellent up-conversion luminescence (UCL) and a superior positive magnetic resonance image (MRI). Using doxorubicin hydrochloride (DOX) as a drug model, the feasibility of Gd/Tm-MOFs as a multifunctional drug carrier was demonstrated. Through modifying Gd/Tm-MOFs with uniform mesoporous silica (mSiO2) shells and folic acid (FA), the drug loading was improved up to 41...
July 30, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Biswa Nath Bhadra, Sung Hwa Jhung
A series of metal-organic framework-74s (MOF-74s), composed of two different metallic species (Zn/Ni or Zn/Mn in various compositions), were synthesized, and Ni or MnO-doped carbonaceous materials were first prepared by pyrolysis of the MOFs under an inert environment for catalytic applications. These MOF-derived nanomaterials (MDNMs), obtained by pyrolysis of MOF-74s, were characterized thoroughly to understand their phase, porosity, particle size, dispersion, and composition. With increasing Zn content in the bimetallic MOF-74s, the porosity of the MDNMs increased but the size and content of Ni or MnO in the MDNMs decreased monotonously...
July 27, 2018: Nanoscale
Hong Yu, Khang Ngoc Dinh, Yuanmiao Sun, Haosen Fan, Yonghui Wang, Yao Jing, Shuzhou Li, Madhavi Srinivasan, Qingyu Yan
Novel nitrogen-doped porous molybdenum carbide (α-MoC1-x and β-Mo2C) architectures were prepared using Mo-based metal-organic frameworks (MOFs) as the precursor. The synthesized molybdenum carbides consist of numerous nanocrystals organized into micro-sized rods with interpenetrating mesoporous-channels and macroporous-tunnels along the axial direction. When employed as the cathode catalyst for Li-O2 batteries, this dual pore configuration offers abundant active sites for the electrochemical reaction and many nucleation sites for the discharge product of Li2O2; hence, decent performances were obtained...
August 9, 2018: Nanoscale
Qiang Wang, Xu-Sheng Wang, Chun-Hui Chen, Xue Yang, Yuan-Biao Huang, Rong Cao
Highly dispersed ultrafine defective Pt nanoparticles (NPs) encapsulated in the mesopores of MIL-101 were successfully achieved for the first time through a facile chemical dealloying approach. PtCo alloy NPs inside the mesoporous MIL-101 were firstly formed via a double-solvent method and the Co species were subsequently selectively etched by diluted nitric acid to achieve the defective Pt NPs. Compared with PtCo alloy NPs, the as-prepared defective Pt NPs showed an improved catalytic activity towards the hydrogenation of nitroarenes under mild conditions...
August 7, 2018: Chemical Communications: Chem Comm
Seo-Yul Kim, Tae-Ung Yoon, Jo Hong Kang, Ah-Reum Kim, Tea-Hoon Kim, Seung-Ik Kim, Wanje Park, Ki Chul Kim, Youn-Sang Bae
Olefin/paraffin separation is an important and challenging issue because the two molecules have similar physicochemical properties. Although a couple of olefin adsorbents have been developed by introducing inorganic nanoparticles into metal-organic frameworks (MOFs), there has been no study on the development of an olefin adsorbent by introducing a certain organic functional group into a MOF. In this study, we posited that azo compounds could offer olefin/paraffin selectivity. We have revealed using first-principles calculations that the simplest aromatic azo compound (azobenzene, Azob) has an unusual propylene/propane selectivity due to special electrostatic interactions between Azob and propylene molecules...
August 6, 2018: ACS Applied Materials & Interfaces
Bin Hu, Jin-Yun Yuan, Jia-Yue Tian, Minghua Wang, Xue Wang, Linghao He, Zhihong Zhang, Zhuo-Wei Wang, Chun-Sen Liu
A new bimetallic Co/Fe-MOF was synthesized and phosphatized to produce a visible-light-active Co/Fe binary metal phosphide embedded in a mesoporous carbon matrix (denoted by CoP/Fe2 P@mC). The results of X-ray diffraction and photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy reveal the formation of CoP and Fe2 P nanoparticles together with the Co and Fe metallic state. Combining the high electron-hole separation rate of Fe2 P@mC, fast electron transfer of CoP@mC, and the strong adsorption of mesoporous carbon, the as-prepared CoP/Fe2 P@mC catalyst exhibits substantially enhanced photocatalytic activity toward rhodamine B (RhB) degradation under visible light irradiation...
July 12, 2018: Journal of Colloid and Interface Science
Xuelian Yan, Yucen Yao, Yuan Chen
High-performance electrocatalysts for the oxygen reduction reaction (ORR) are essential in electrochemical energy storage and conversion technologies. Fe-N-C electrocatalysts have been developed as one of the most promising alternatives to precious metal materials. Current M-N-C electrocatalysts usually are derived from high-temperature thermal treatment of a nitrogen-containing polymer or metal-organic frameworks (MOFs). Here, we developed Fe-N-C mesoporous nanofibers with low-cost urea and FeCl3 as the nitride and iron source; the electrocatalysts with abundant Fe-Nx active sites and large surface area were synthesized via electrospinning, in situ pyrolysis, and acid treatment process...
July 20, 2018: Nanoscale Research Letters
Ke Wang, Hailong Ren, Nan Li, Xiaoyan Tan, Fuquan Dang
A novel ratiometric fluorescence sensing system based on cholesterol oxidase-functionalized dual-color mesoporous silica nanoparticles (MSNs)@metal-organic framework core-shell nanocomposite is demonstrated for cholesterol detection. MSNs were first loaded with 5-aminofluorescein (AF) inside pores and then wrapped with red-emission CdTe quantum dots (QDs) on the surface to seal in the dye molecules, forming the signal displaying unit (AF-MSN-QDs). Next, AF-MSN-QDs were encapsulated with zeolitic imidazolate framework (ZIF-8) to form a transition layer with distinct size-selectivity, which not only protected the cores from corrosion but also greatly decreased background interference from large molecules...
October 1, 2018: Talanta
Niels Tannert, Serkan Gökpinar, Emrah Hastürk, Sandra Nießing, Christoph Janiak
Microwave-assisted dry-gel conversion (MW-DGC) combines the advantages of concentrated reactants in DGC with fast heating by microwave irradiation. This novel combination allows drastically decreasing the amount of solvent needed for synthesis and reaction times with the energy needed. Furthermore, MW-DGC allows for the recovery and re-use of the reaction solvent and thereby can significantly reduce the overall solvent waste in the syntheses of the four important MOFs MIL-100(Fe) (Basolite F300), UiO-66, MIL-140A and aluminium fumarate (Alfum, Basolite A520)...
July 24, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Qingmeng Gan, Hanna He, Kuangmin Zhao, Zhen He, Suqin Liu
The performance of energy storage materials is substantially dependent on their nanostructures. Herein, Ni-1,3,5-benzenetricarboxylate metal-organic frameworks (Ni-BTC MOFs) with different morphologies are controllably synthesized using a facile solvothermal method by simply adjusting the solvent and their electrochemical performance as an anode material for lithium-ion batteries is thoroughly investigated. Among the synthesized Ni-BTC MOFs with different morphologies, a hierarchical mesoporous flower-like Ni-BTC MOF (Ni-BTCEtOH ) assembled from two-dimensional nanosheets shows the best electrochemical properties including a high capacity of 1085 mA h g-1 at 100 mA g-1 (358 mA h g-1 at 5000 mA g-1 ), excellent cycling stability at 1000 mA g-1 for 1000 cycles, and great rate performance, which is superior to most of the reported MOF-based anode materials for lithium-ion batteries...
June 22, 2018: Journal of Colloid and Interface Science
Zehao Zhou, Mengyuan Li, Jian Zhao, Zhenghan Di, Chunzhi Di, Bei Liu, Chao Zhang, Chun-Hua Yan, Lele Li
Here we report, for the first time, the growth of single-crystalline mesoporous MOFs with well-controlled orientation on the surface of gold nanorods. Importantly, it showed that trace amounts of water could induce the formation of MOFs of different phases and shapes, which was critical for the synthesis of such mesoporous heterostructures.
July 19, 2018: Chemical Communications: Chem Comm
Jayraj N Joshi, Guanghui Zhu, Jason J Lee, Eli A Carter, Christopher W Jones, Ryan P Lively, Krista S Walton
Parent and amine-functionalized analogues of metal-organic frameworks (MOFs), UiO-66(Zr), MIL-125(Ti), and MIL-101(Cr), were evaluated for their hydrogen sulfide (H2 S) adsorption efficacy and post-exposure acid gas stability. Adsorption experiments were conducted through fixed-bed breakthrough studies utilizing multicomponent 1% H2 S/99% CH4 and 1% H2 S/10% CO2 /89% CH4 natural gas simulant mixtures. Instability of MIL-101(Cr) materials after H2 S exposure was discovered through powder X-ray diffraction and porosity measurements following adsorbent pelletization, whereas other materials retained their characteristic properties...
July 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Dandan Liu, Hongwei Zhu, Jinchong Zhao, Longjun Pan, Pengcheng Dai, Xin Gu, Liangjun Li, Yunqi Liu, Xuebo Zhao
Over the past decades, extensive efforts have been devoted to modulating the textural properties, morphology and microstructure of γ-Al₂O₃, since the physiochemical properties of γ-Al₂O₃ have close correlations with the performance of hydrotreating catalysts. In this work, a spongy mesoporous γ-alumina (γ-Al₂O₃) was synthesized using Al-based metal-organic frameworks (Al-MOFs) as precursor by two-step pyrolysis, and this Al-MOF-derived γ-Al₂O₃ was used as hydrodesulfurization (HDS) catalyst support, to explore the effect of support on the HDS performance...
June 24, 2018: Materials
Dan Ping Wang, Maosen Fu, Yuan Ha, Hao Wang, Renbing Wu
A mesoporous octahedral copper oxide@titania (CuO/TiO2 ) composites with core-shelled structure have been successfully fabricated via a facile and cost-effective approach, which involves two main steps: the creation of homogeneous TiO2 shell onto the octahedral Cu-based metal-organic frameworks (MOFs) template and thermal decomposition of the template at controlled temperature in the air. The design of combining CuO with the TiO2 layer within a porous octahedra structure is beneficial to integrate the advantages of different components and address the severe volume change associated with pulverization issue that exists in most metal oxides-based electrodes...
November 1, 2018: Journal of Colloid and Interface Science
Ignacio Luz, Mustapha Soukri, Marty Lail
Solid-state synthesis ensures a high loading and well-dispersed growth of a large collection of metal-organic framework (MOF) nanostructures within a series of commercially available mesoporous silica. This approach provides a general, highly efficient, scalable, environmentally friendly, and inexpensive strategy for shaping MOFs into a fluidized form, thereby allowing their application in fluidized-bed reactors for diverse applications, such as CO2 capture from post-combustion flue gas. A collection of polyamine-impregnated MOF/SiO2 hybrid sorbents were evaluated for CO2 capture under simulated flue gas conditions in a packed-bed reactor...
May 28, 2018: Chemical Science
Ignacio Luz, Mustapha Soukri, Marty Lail
A general and efficient method for shaping MOFs into fluidized forms has been developed by direct conversion of metal oxides supported on fluidized mesoporous silica. The resulting fluidized MOF hybrid materials containing diamines coordinated at the open metal sites have been studied as CO2 solid sorbents from post-combustion flue gas showing similar performance than their bulk counterparts. These new fluidized MOF hybrid materials can be used for other applications involving fluidized bed reactor configurations, in which MOFs have never been considered...
June 6, 2018: Chemistry: a European Journal
Margarita Vázquez-González, Itamar Willner
Recent advances addressing the development of stimuli-responsive nucleic acid (DNA)-functionalized micro/nanocarriers for the controlled release of drugs are presented. The DNA associated with the drug-loaded carriers acts as capping units that lock the drugs in the carriers. In the presence of appropriate triggers, the capping units are unlocked, resulting in the release of the drugs. Three types of DNA-modified carriers are discussed, including mesoporous SiO2 nanoparticles (MP SiO2 NPs), metal-organic framework nanoparticles (NMOFs) and micro/nanocapsules...
June 25, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jun Young Cheong, Won-Tae Koo, Chanhoon Kim, Ji-Won Jung, Il-Doo Kim
Facile synthesis of rationally designed nanostructured electrode materials with high reversible capacity is highly critical to meet ever-increasing demands for lithium-ion batteries. In this work, we employed defect engineering by incorporating metal organic framework (MOF) templates into one-dimensional nanostructures by simple electrospinning and subsequent calcination. The introduction of Co-based zeolite imidazole frameworks (ZIF-67) resulted in abundant oxygen vacancies, which induce not only more active sites for Li storage but also enhanced electrical conductivity...
June 20, 2018: ACS Applied Materials & Interfaces
Yingmu Zhang, Xinyu Yang, Hong-Cai Zhou
A new luminescent mesoporous metal-organic framework (PCN-604) was successfully synthesized from trimetric clusters, Al3(O)(CH3COO)6, and pyridine-based tritopic linkers, 4,4',4''-(pyridine-2,4,6-triyl)tribenzoate (PTB), via a solvothermal reaction. The MOF with an MTN topology possesses remarkable aqueous and thermal stabilities. Due to the efficient binding sites rendered by the pyridyl-based linkers, PCN-604 shows a fast fluorescence response towards trace amounts of Fe3+ ions in water in a fluorescence-quenching mode...
June 4, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"