Metal–organic frameworks for H<sub>2</sub>and CH<sub>4</sub>storage: insights on the pore geometry–sorption energetics relationship

Alkordi, Mohamed H.; Belmabkhout, Youssef; Cairns, Amy; Eddaoudi, Mohamed

doi:10.1107/s2052252516019060

Cited by 36 publications

(21 citation statements)

References 39 publications

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“…MOFs have a wide range of compositions, crystalline structures, and crystal shapes, providing advantages over other types of materials [ 34 ]. Since the late 1990s, MOFs have been widely used in gas adsorption and separation [ 35 ] supercapacitor electrodes, catalysis, sensing [ 36 ], bio-imaging, and magnetism [ 37 ]. Some MOFs have extra-large surface areas, high-connectivity polyhedral cages, large pore volumes, high stability, nontoxicity, biocompatibility, and small sizes, making them potential excellent nanocarriers in the biomedical field [ 38 ].…”

Section: Discussionmentioning

confidence: 99%

Biocompatible Fe-Based Micropore Metal-Organic Frameworks as Sustained-Release Anticancer Drug Carriers

et al. 2018

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Sustained-release preparation is a hot spot in antitumor drug research, where the first task is to select suitable drug carriers. Research has revealed that carboxylic acid iron metal–organic frameworks (MOFs), constructed from iron (Fe) ions and terephthalic acid, are nontoxic and biocompatible. Due to the breathing effect, the skeleton of this mesoporous material is flexible and can reversibly adapt its pore size through drug adsorption. Therefore, we chose one kind of Fe-MOF, MIL-53(Fe), as a carrier for the anticancer drug oridonin (Ori). In this work, we report the design and synthesis of MIL-53(Fe) and explore its ability as a transport vehicle to deliver Ori. MIL-53(Fe) is characterized by scanning electron microscopy and X-ray powder diffraction. A loading capacity of 56.25 wt % was measured by high performance liquid chromatography. This carrier was safe and nontoxic (cell viability > 95.27%), depending on the results of 3-(4,5-dimethylthiazol-2-yl)--2,5-diphenyltetrazolium bromide assays, lactate dehydrogenase assays, and Annexin V-fluoresce isothiocyanate/propidium iodide double-staining assays. After loading the drug, the structure of the MIL-53(Fe) was not destroyed, and Ori was amorphous in MIL-53(Fe). Based on an analysis of the Ori release profile, results suggest that it lasts for more than seven days in vitro. The cumulative release rate of Ori at the seventh day was about 82.23% and 91.75% in phosphate buffer saline solution at 37 °C under pH 7.2 and pH 5.5, respectively. HepG2 cells were chosen to study the cytotoxicity of Ori@MIL-53(Fe), and the results show that the anticancer ratio of Ori@MIL-53(Fe) system reaches 90.62%. Thus, MIL-53 can be used as a carrier for anticancer drugs and Ori@MIL-53(Fe) is a promising sustained-release drug delivery system for the cancer therapy.

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Section: Discussionmentioning

confidence: 99%

Biocompatible Fe-Based Micropore Metal-Organic Frameworks as Sustained-Release Anticancer Drug Carriers

et al. 2018

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“…Among all the possibilities, metal‐organic frameworks (MOFs), a class of hybrid crystalline porous compounds, have emerged as excellent materials for energy storage and conversion due to their interesting chemical and structural properties, such as relatively easy chemical synthesis, large specific surface area, and accessible cavities . The porous structure of MOFs favors the incorporation of molecules into their structure, and this concept has been used to store fuels as H 2 or methane . Moreover, their electrochemical catalytic properties were exploited to implement them as electrocatalysts in fuel cells .…”

Section: Introductionmentioning

confidence: 99%

New OLEDs Based on Zirconium Metal‐Organic Framework

Gutiérrez

Martín

Kennes

et al. 2018

Advanced Optical Materials

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The search for new smart‐materials in solid‐state light‐emitting applications, like hybrid organic–inorganic light‐emitting devices (OLEDs), has seen an intense growth in the recent years. Among all the possibilities, metal‐organic frameworks (MOFs) have emerged as promising smart materials due to their chemical and structural properties. Herein, for the first time, the use of a Zr‐based MOF (Zr‐NDC, NDC = dimethyl 2,6‐naphthalenedicarboxylate) as electroluminescent active material in OLED devices is reported. The results indicate that, independently of the properties of the polymer used to form the emissive layer, the OLED emission is due to radiative electron and hole recombination in the MOF. A tuning of the optoelectronic properties of the device by incorporating Coumarin 153, (C153) and 4‐(Dicyanomethylene)‐2‐methyl‐6‐(4‐dimethylaminostyryl)‐4H‐pyran, into the MOF pores is demonstrated. Using different MOFLED architectures, and MOF composition, it is possible to elucidate the photoluminescence and electroluminescence mechanisms, providing the clues for further improvements. It is observed that the current density as well as the electroluminescent behavior depends on the dopant fluorophores. It is also shown that defects within the Zr‐MOF play a role in the OLED optoelectronic properties. The results clearly demonstrate the potential of MOFs as new tunable electroluminescent materials for OLED applications.

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“…The paper published in this issue of IUCrJ by Eddaoudi and co-workers (Alkordi et al, 2017) demonstrates that the common weak hydrogen binding affinities to aromatic surfaces can be dramatically enhanced, and this is accomplished by forcing the gas molecules to form multiple dispersive interactions with the specific pore geometry of a new MOF (Fig. 1).…”

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confidence: 99%

Collaborative interactions to enhance gas binding energy in porous metal–organic frameworks

Lin

Chen

2017

Int Union Crystallogr J

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Clean and renewable energy and technologies are in great demand due to environmental and energy concerns. Hydrogen (H 2 ) and natural gas (NG, mainly methane) are more environmentally friendly and efficient alternative fuels given their lower exhaust emissions and high gravimetric energy densities. Compared with conventional fossil fuels, the combustion of hydrogen emits only water, while natural gas emits 25% less carbon dioxide. For hydrogen and methane, their gravimetric heats of combustion (123 and 55.7 MJ kg À1 , respectively) are higher than that of gasoline (47.2 MJ kg À1 ) (Suh et al., 2012). These advantages make hydrogen and methane promising clean power sources. However, the density of either hydrogen or methane is extremely low, making their onboard storage a great challenge and preventing the widespread use of these gases in vehicles. Possible solutions in conventional storage could be liquefaction at low temperature (20 K for liquefied hydrogen) or compression at ambient temperature and high pressure (hundreds of atmospheres). These solutions require heavy bulky fuel tanks or expensive compressors, putting a serious limitation on their possible applications, particularly for passenger vehicles. An alternative solution is to increase the gas storage density under relatively mild conditions using porous materials. Introducing porous materials into fuel tanks can drastically reduce the stored pressure at ambient temperature, which is more efficient and safe. Hence it is critically important to develop efficient adsorbent materials to use these promising clean fuels.Metal-organic frameworks (MOFs, also known as porous coordination polymers) are a new generation of porous materials (Furukawa et al., 2013) which have intensively changed a wide range of technological fields, especially in the separation and storage of gases. Owing to their uniform pore structures, tunable pore sizes and designable structures, MOFs have been proven as ideal candidates for hydrogen and methane storage (Suh et al., 2012;Li et al., 2016;He et al., 2014;Mason et al., 2014;Sculley et al., 2011). Benefitting from the infinite permutations of their inorganic and organic components, MOFs are more extensive in their diversity than any other class of conventional porous material. The pore structures are easily controlled to obtain optimized performance, which has been clearly demonstrated in the latest important progress on MOFs for hydrocarbon separation (Cui et al., 2016). MOFs were first reported to store hydrogen gas in around 2003(Rosi et al., 2003, while methane storage can be dated back to 1997 (Kondo et al., 1997). Since then, remarkable progress has been achieved and hundreds of MOFs have been developed with a high capacity for these fuel gases.Generally, the interaction between hydrogen and the surface of a MOF is quite weak, so functionalizing the organic linkers will have little positive effect on hydrogen adsorption. By increasing the pore volume and surface area, the total gravimetric hydrogen capacity can be up to 17....

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Metal–organic frameworks for H₂and CH₄storage: insights on the pore geometry–sorption energetics relationship

Abstract: Controlling the MOF pore geometry, size and functionality is of prime importance for the effective and selective gas adsorption. Gas adsorption studies on ultra-microporous MOFs were conducted to gain insight on the pore geometry–sorption energetics relationship.

Cited by 36 publications

References 39 publications

Biocompatible Fe-Based Micropore Metal-Organic Frameworks as Sustained-Release Anticancer Drug Carriers

Biocompatible Fe-Based Micropore Metal-Organic Frameworks as Sustained-Release Anticancer Drug Carriers

New OLEDs Based on Zirconium Metal‐Organic Framework

Collaborative interactions to enhance gas binding energy in porous metal–organic frameworks

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Metal–organic frameworks for H2and CH4storage: insights on the pore geometry–sorption energetics relationship

Abstract: Controlling the MOF pore geometry, size and functionality is of prime importance for the effective and selective gas adsorption. Gas adsorption studies on ultra-microporous MOFs were conducted to gain insight on the pore geometry–sorption energetics relationship.

Cited by 36 publications

References 39 publications

Biocompatible Fe-Based Micropore Metal-Organic Frameworks as Sustained-Release Anticancer Drug Carriers

Biocompatible Fe-Based Micropore Metal-Organic Frameworks as Sustained-Release Anticancer Drug Carriers

New OLEDs Based on Zirconium Metal‐Organic Framework

Collaborative interactions to enhance gas binding energy in porous metal–organic frameworks

Contact Info

Product

Resources

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Metal–organic frameworks for H₂and CH₄storage: insights on the pore geometry–sorption energetics relationship