Articoli di riviste: "Flexible porous MOF"

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Zhang, Junxuan, Jie You, Qing Wei, Jeong-In Han e Zhiming Liu. "Hollow Porous CoO@Reduced Graphene Oxide Self-Supporting Flexible Membrane for High Performance Lithium-Ion Storage". Nanomaterials 13, n. 13 (30 giugno 2023): 1986. http://dx.doi.org/10.3390/nano13131986.

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We report an environment-friendly preparation method of rGO-based flexible self-supporting membrane electrodes, combining Co-MOF with graphene oxide and quickly preparing a hollow CoO@rGO flexible self-supporting membrane composite with a porous structure. This unique hollow porous structure can shorten the ion transport path and provide more active sites for lithium ions. The high conductivity of reduced graphene oxide further facilitates the rapid charge transfer and provides sufficient buffer space for the hollow Co-MOF nanocubes during the charging process. We evaluated its electrochemical performance in a coin cell, which showed good rate capability and cycling stability. The CoO@rGO flexible electrode maintains a high specific capacity of 1103 mAh g−1 after 600 cycles at 1.0 A g−1. The high capacity of prepared material is attributed to the synergistic effect of the hollow porous structure and the 3D reduced graphene oxide network. This would be considered a promising new strategy for synthesizing hollow porous-structured rGO-based self-supported flexible electrodes.

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Seth, Soana, Govardhan Savitha e Jarugu Narasimha Moorthy. "Diverse isostructural MOFs by postsynthetic metal node metathesis: anionic-to-cationic framework conversion, luminescence and separation of dyes". Journal of Materials Chemistry A 3, n. 45 (2015): 22915–22. http://dx.doi.org/10.1039/c5ta04551g.

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Postsynthetic metal-node metathesis of a flexible, yet robust porous anionic Cd–MOF with different metal ions of varying ionic radii, charges and chemical nature leads to diverse isostructural MOFs. The Eu@MOF and Tb@MOF – accessed by PSME – are brilliantly luminescent. The modified MOFs permit organic dye separation.

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Ling, Yajing, Jingjing Jiao, Mingxing Zhang, Huimin Liu, Dongjie Bai, Yunlong Feng e Yabing He. "A porous lanthanide metal–organic framework based on a flexible cyclotriphosphazene-functionalized hexacarboxylate exhibiting selective gas adsorption". CrystEngComm 18, n. 33 (2016): 6254–61. http://dx.doi.org/10.1039/c6ce00497k.

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Ma, Qintian, Qingyuan Yang, Aziz Ghoufi, Ke Yang, Ming Lei, Gérard Férey, Chongli Zhong e Guillaume Maurin. "Guest-modulation of the mechanical properties of flexible porous metal–organic frameworks". J. Mater. Chem. A 2, n. 25 (2014): 9691–98. http://dx.doi.org/10.1039/c4ta00622d.

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The highly flexible hybrid nanoporous MOF MIL-53(Cr) was evoked as a potential medium to store mechanical energy via a structural switching from an open to a close pore form under moderate applied external pressures.

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Hou, Chaoyi, Yue-Ling Bai, XiaoLi Bao, Liangzhen Xu, Rong-Guang Lin, Shourong Zhu, Jianhui Fang e Jiaqiang Xu. "A metal–organic framework constructed using a flexible tripodal ligand and tetranuclear copper cluster for sensing small molecules". Dalton Transactions 44, n. 17 (2015): 7770–73. http://dx.doi.org/10.1039/c5dt00762c.

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Haldar, Ritesh, e Christof Wöll. "Hierarchical assemblies of molecular frameworks—MOF-on-MOF epitaxial heterostructures". Nano Research 14, n. 2 (20 luglio 2020): 355–68. http://dx.doi.org/10.1007/s12274-020-2953-z.

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AbstractFunctional, porous metal-organic frameworks (MOFs) have attracted much attention as a very flexible class of crystalline, porous materials. For more advanced applications that exploit photophysical properties, the fabrication of hierarchical assemblies, including the creation of MOF/MOF heterointerfaces, is important. For the manufacturing of superstructures with length scales well beyond that of the MOF pore size, layer-by-layer (lbl) methods are particularly attractive. These allow the isoreticular approach to be extended to superstructures with micrometer length scales, a range that is not accessible using conventional MOF design. The lbl approach further substantially extends the compositional diversity in MOFs. At the same time, the favorable elastic properties of MOFs allow for heteroepitaxial growth, even in the case of lattice misfits as large as 20%. While the MOF-on-MOF approach to designing multicomponent superstructures with synergistic multifunctionality can also be realized with sophisticated solvothermal synthesis schemes, the lbl (or liquid-phase epitaxy) approach carries substantial advantages, in particular when it comes to the integration of such MOF superstructures into optical or electronic devices. While the structure vertical to the substrate can be adjusted using the lbl method, photolithographic methods can be used for lateral structuring. In this review, we will discuss the lbl liquid-phase epitaxy approach to growing surface-anchored MOF thins films (SURMOFs) as well as other relevant one-pot synthesis methods for constructing such hierarchically designed structures and their emerging applications.

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Li, Zhen, Jingting Bu, Chenying Zhang, Lingli Cheng, Dengyu Pan, Zhiwen Chen e Minghong Wu. "Electrospun carbon nanofibers embedded with MOF-derived N-doped porous carbon and ZnO quantum dots for asymmetric flexible supercapacitors". New Journal of Chemistry 45, n. 24 (2021): 10672–82. http://dx.doi.org/10.1039/d1nj01369f.

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Deng, Mingli, Shijun Tai, Weiquan Zhang, Yongchen Wang, Jiaxing Zhu, Jinsheng Zhang, Yun Ling e Yaming Zhou. "A self-catenated rob-type porous coordination polymer constructed from triazolate and carboxylate ligands: fluorescence response to the reversible phase transformation". CrystEngComm 17, n. 31 (2015): 6023–29. http://dx.doi.org/10.1039/c5ce00887e.

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Li, Zhen, Julio Fraile, Clara Viñas, Francesc Teixidor e José G. Planas. "Post-synthetic modification of a highly flexible 3D soft porous metal–organic framework by incorporating conducting polypyrrole: enhanced MOF stability and capacitance as an electrode material". Chemical Communications 57, n. 20 (2021): 2523–26. http://dx.doi.org/10.1039/d0cc07393h.

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Cao, Xiao-Man, Zhi-Jia Sun, Si-Yu Zhao, Bing Wang e Zheng-Bo Han. "MOF-derived sponge-like hierarchical porous carbon for flexible all-solid-state supercapacitors". Materials Chemistry Frontiers 2, n. 9 (2018): 1692–99. http://dx.doi.org/10.1039/c8qm00284c.

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Novel 3D sponge-like hierarchical porous carbons using different-sized MOFs (Zn(tbip)) as precursors are successfully prepared via a one-step pyrolysis process, and are promising for application in high-performance flexible all-solid-state supercapacitors.

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Benecke, Jannik, Alexander Fuß, Tobias A. Engesser, Norbert Stock e Helge Reinsch. "A Flexible and Porous Ferrocene‐Based Gallium MOF with MIL‐53 Architecture". European Journal of Inorganic Chemistry 2021, n. 8 (9 febbraio 2021): 713–19. http://dx.doi.org/10.1002/ejic.202001085.

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Derbe, Tessema, Taju Sani, Enyew Amare e Teketel Girma. "Mini Review on Synthesis, Characterization, and Application of Zeolite@MOF Composite". Advances in Materials Science and Engineering 2023 (11 aprile 2023): 1–28. http://dx.doi.org/10.1155/2023/8760967.

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Zeolite@MOF composite is a bifunctional composite formed from thermal and structural stable inorganic zeolite and high tunable surface area and structural flexible MOF. The parent material “MOF” has a higher surface area and structural elasticity than zeolite. Nevertheless, MOF is more structurally and mechanically unstable than zeolite. Thus, compositing of structural stable zeolite with tunable porous MOF has enhanced the applications of Zeolite@MOFcomposite over its parent materials. The Zeolite@MOF composite was synthesized through the hydrothermal method, the solvothermal method, the refluxing method, and the microwave-assisted method. The synthesized Zeolite@MOF composite also further modified via postsynthesis or presynthesis modification method to bring them extra functionality. Recently, researchers have synthesized Zeolite@MOF composite using hydrothermal method for zeolite crystallization and then solvothermal growth of MOF over presynthesized zeolite surface to reduce competitions between zeolite and MOF precursors through nucleation and crystal formation. The structure of Zeolite@MOF composite, such as morphology, microstructure, functional group, particle size, elemental composition, and weight loss was also analysed using SEM, TEM, FTIR, X-RD, EDX, and TAG, respectively. After exploring the characterization techniques of Zeolite@MOF composite, a performance application of Zeolite@MOF was also reviewed. Zeolite@MOF is used for the degradation of organic dyes (methyl blue and methyl orange) from wastewater; zeolite@MOF is also used as a catalyst in the synthesis of organic compounds. Zeolite@MOF composites showed higher catalytic activity, high selectivity, and high product yield than the corresponding zeolite and MOF parent materials. Hence, the compositing of zeolite and MOF is promising to overcome the individual limitations of zeolite and MOF. Zeolite@MOF composite has a synergic performance advantage over its parent materials.

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Yin, Zheng. "Metal Doping Induced Formation and Dynamic Gas Sorption of a Highly Porous Mesoporous MetalOrganic Framework". Advance Research in Organic and Inorganic Chemistry (AROIC) 4, n. 1 (26 aprile 2023): 1–2. http://dx.doi.org/10.54026/aroic/1015.

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A new high-porosity MOF of [Ni2.3Zn0.7(tzba)3 (H2 O)6 ]·12DMF (NiZn-MOF) processes 2D (3,6)-grid layers constructed from rare [M2 (tz)3 (H2 O)3 ] and [M(COO)3 ] nodes. The metal doping of Ni2+ and Zn2+ are crucial for the formation of the two kinds of metal nodes and subsequent synergistical assembly into the mesoporous MOF, in contrast to the formation of MIL-88-topology resembled compound of {(Me2 NH2 )[Ni3 (μ3 -OH)(tzba)3 (H2 O)3 ]·8DMF (Ni3-MOF) using single Ni2+ as metal source. The regular 2D layers stacked in parallel and ABAB fashion through interlayer hydrogen bonding, leading to a neutral framework with void fraction up to 72.1% and 1D mesoporous hexagonal channels sized at 24.0 Å in diameter. The large gas accessible porosity was revealed by the saturated N2 and CO2 uptake of 720 and 708 cm3 g-1, at 77 K and 195 K, respectively, giving a high Langmuir surface area of 2066 m2 g-1. The varying gas sorption amounts dependent on accommodated solvents and activation temperature, as well as the gate-opening behaviors in sorption isotherms, well confirm the dynamic structure response to guest species of the flexible framework.

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Ma, Yanhong, e Xin Zhang. "Structure Tuning of Hafnium Metal–Organic Frameworks through a Mixed Solvent Approach". Crystals 12, n. 6 (29 maggio 2022): 785. http://dx.doi.org/10.3390/cryst12060785.

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The recent development of water-stable metal–organic frameworks (MOFs) has significantly broadened the application scope of this emerging type of porous material. Structure tuning of hafnium MOFs is less studied compared with zirconium MOFs. In this work, we report the synthesis of a mesoporous hafnium MOF, csq-MOF-1, through finely tuning the solvent mixture ratio. The successful synthesis of csq-MOF-1 also relies on the linker flexibility as linker bending and a symmetry decrease were observed in this framework as compared to its structural isomer NPF-300 (Hf). The mesoporous feature and permanent porosity were determined by the N2 adsorption at 77 K. Such a hierarchical pore feature is expected to enable a variety of applications through encapsulation of large functional molecules. The synthetic strategy of utilizing a mixed solvent and flexible linker is expected to inspire the development of new hafnium MOFs with diverse topological structures.

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Cui, Xiaolei, Guodong Kong, Yang Feng, Longting Li, Weidong Fan, Jia Pang, Lili Fan et al. "Interfacial polymerization of MOF “monomers” to fabricate flexible and thin membranes for molecular separation with ultrafast water transport". Journal of Materials Chemistry A 9, n. 32 (2021): 17528–37. http://dx.doi.org/10.1039/d1ta04049a.

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The “ordered porous monomers” of MOFs are interfacially assembled into thin and flexible membranes economically, which exhibit efficient dye separation with ultrafast water transport properties even after being rolled up and enlarged to a large area.

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Li, Jiaxin, Yachao Yan, Yingzhi Chen, Qinglin Fang, Muhammad Irfan Hussain e Lu-Ning Wang. "Flexible Curcumin-Loaded Zn-MOF Hydrogel for Long-Term Drug Release and Antibacterial Activities". International Journal of Molecular Sciences 24, n. 14 (14 luglio 2023): 11439. http://dx.doi.org/10.3390/ijms241411439.

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Management of chronic inflammation and wounds has always been a key issue in the pharmaceutical and healthcare sectors. Curcumin (CCM) is an active ingredient extracted from turmeric rhizomes with antioxidant, anti-inflammatory, and antibacterial activities, thus showing significant effectiveness toward wound healing. However, its shortcomings, such as poor water solubility, poor chemical stability, and fast metabolic rate, limit its bioavailability and long-term use. In this context, hydrogels appear to be a versatile matrix for carrying and stabilizing drugs due to their biomimetic structure, soft porous microarchitecture, and favorable biomechanical properties. The drug loading/releasing efficiencies can also be controlled via using highly crystalline and porous metal-organic frameworks (MOFs). Herein, a flexible hydrogel composed of a sodium alginate (SA) matrix and CCM-loaded MOFs was constructed for long-term drug release and antibacterial activity. The morphology and physicochemical properties of composite hydrogels were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis), Raman spectroscopy, and mechanical property tests. The results showed that the composite hydrogel was highly twistable and bendable to comply with human skin mechanically. The as-prepared hydrogel could capture efficient CCM for slow drug release and effectively kill bacteria. Therefore, such composite hydrogel is expected to provide a new management system for chronic wound dressings.

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Mahadi, Nurfatihah, Halina Misran e S. Z. Othman. "Synthesis and Characterizations of MOF-199 Using PODFA as Porogen for CO₂ Adsorption Applications". Key Engineering Materials 694 (maggio 2016): 44–49. http://dx.doi.org/10.4028/www.scientific.net/kem.694.44.

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Copper-based metal-organic framework (MOF-199, also known as Cu-BTC and HKUST-1) materials were successfully synthesized by hydrothermal method using renewable straight-chain fatty alcohol with eight carbon chain length (i.e. octyl alcohol). The addition of palm oil derived fatty alcohol (PODFA) was suggested to act as porogen (structure directing agent) that aided the particle formation and flexible porous structure. This synthesis approach was environmental-friendly and sustainable by utilizing the fatty alcohols originated from biomass such as palm oil. The resulting MOF-199 materials exhibited single crystalline octahedral morphology structure by X-ray diffraction analyses and SEM images. The optimum ratio of octyl alcohol exhibited well-defined single octahedral particles at size range of ca. 10-50 µm and reduced by-product formation of cuprous oxide at high temperature synthesis. The nature of MOF-199 having apparently high surface area, high pore volume and low density provided the possibility in carbon capture storage. The CO2 adsorption capacity of MOF-199 investigated using high pressure volumetric analyser (HPVA-II) at ambient temperature (i.e. 25 °C) was found to be at maximum working capacity.

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HU, ZHIGANG, e DAN ZHAO. "POLYMERIZATION WITHIN CONFINED NANOCHANNELS OF POROUS METAL-ORGANIC FRAMEWORKS". Journal of Molecular and Engineering Materials 01, n. 02 (giugno 2013): 1330001. http://dx.doi.org/10.1142/s2251237313300015.

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Metal-organic frameworks (MOFs) have been increasingly investigated as templates for precise control of polymerization. Polymerizations within confined nanochannels of porous MOFs have shown unique confinement and alignment effect on polymer chain structures and thus are promising ways to achieve well-defined polymers. Herein, this review will focus on illustrating the recent progress of polymerization within confined nanochannels of MOFs, including radical polymerization, coordination polymerization, ring-opening polymerization, catalytic polymerization, etc. It will demonstrate how the heterogeneous MOF structures (pore size, pore shapes, flexible structures, and versatile functional groups) affect the polymeric products' molecular weight, molecular weight distribution, tacticity, reaction sites, copolymer sequence, etc. Meanwhile, we will highlight some challenges and foreseeable prospects on these novel polymerization methods.

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Pettinari, Claudio, e Alessia Tombesi. "MOFs for Electrochemical Energy Conversion and Storage". Inorganics 11, n. 2 (30 gennaio 2023): 65. http://dx.doi.org/10.3390/inorganics11020065.

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Metal organic frameworks (MOFs) are a family of crystalline porous materials which attracts much attention for their possible application in energy electrochemical conversion and storage devices due to their ordered structures characterized by large surface areas and the presence in selected cases of a redox-active porous skeleton. Their synthetic versatility and relevant host-guest chemistry make them suitable platform for use in stable and flexible conductive materials. In this review we summarize the most recent results obtained in this field, by analyzing the use of MOFs in fuel and solar cells with special emphasis on PEMFCs and PSCs, their application in supercapacitors and the employment in batteries by differentiating Li-, Na- and other metal ion-batteries. Finally, an overview of the water splitting reaction MOF-catalyzed is also reported.

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Chalati, T., P. Horcajada, R. Gref, P. Couvreur e C. Serre. "Optimisation of the synthesis of MOF nanoparticles made of flexible porous iron fumarate MIL-88A". J. Mater. Chem. 21, n. 7 (2011): 2220–27. http://dx.doi.org/10.1039/c0jm03563g.

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Wang, Lin, Wei-Wei He, Zhao-Quan Yao e Tong-Liang Hu. "A Flexible Porous MOF Exhibiting Reversible Breathing Behavior through Single-Crystal to Single-Crystal Transformation". ChemistrySelect 2, n. 1 (9 gennaio 2017): 283–87. http://dx.doi.org/10.1002/slct.201601666.

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Safdar Ali, Rashda, Hongmin Meng e Zhaohui Li. "Zinc-Based Metal-Organic Frameworks in Drug Delivery, Cell Imaging, and Sensing". Molecules 27, n. 1 (24 dicembre 2021): 100. http://dx.doi.org/10.3390/molecules27010100.

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The design and structural frameworks for targeted drug delivery of medicinal compounds and improved cell imaging have been developed with several advantages. However, metal-organic frameworks (MOFs) are supplemented tremendously for medical uses with efficient efficacy. These MOFs are considered as an absolutely new class of porous materials, extensively used in drug delivery systems, cell imaging, and detecting the analytes, especially for cancer biomarkers, due to their excellent biocompatibility, easy functionalization, high storage capacity, and excellent biodegradability. While Zn-metal centers in MOFs have been found by enhanced efficient detection and improved drug delivery, these Zn-based MOFs have appeared to be safe as elucidated by different cytotoxicity assays for targeted drug delivery. On the other hand, the MOF-based heterogeneous catalyst is durable and can regenerate multiple times without losing activity. Therefore, as functional carriers for drug delivery, cell imaging, and chemosensory, MOFs’ chemical composition and flexible porous structure allowed engineering to improve their medical formulation and functionality. This review summarizes the methodology for fabricating ultrasensitive and selective Zn-MOF-based sensors, as well as their application in early cancer diagnosis and therapy. This review also offers a systematic approach to understanding the development of MOFs as efficient drug carriers and provides new insights on their applications and limitations in utility with possible solutions.

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Chaturvedi, Garima, Rishabh Jaiswal, S. A. Ilangovan, S. Sujatha, K. S. Ajeesh e Sankara Sarma V. Tatiparti. "Ni-MOF Based Flexible Solid-State Supercapacitors in Aqueous and Non-Aqueous Electrolytes". ECS Meeting Abstracts MA2023-02, n. 1 (22 dicembre 2023): 13. http://dx.doi.org/10.1149/ma2023-02113mtgabs.

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Supercapacitors are high power density devices which acts a bridge between the batteries and conventional capacitors. Several emerging materials like Metal Organic Frameworks (MOFs) have been developed as electrode material for energy storage. MOFs are highly porous materials containing metal centers and organic moieties called ligands [1].They are widely employed for energy storage applications owing to their structural and morphological tunability [2]. In our recent research work, Ni MOF is synthesized using microwave assisted solvothermal technique at different temperature and metal to ligand ratios. Ni MOF is synthesized by varying metal to ligand ratio (M:L) as 1:1, 2:1, 3:1 and 4:1. The solution is heated by microwave irradiation technique [3] from room temperature to 150, 165, 180 and 200 °C to obtain light green colored samples. It is interesting to observe that different synthesis parameters lead to different morphologies thereby resulting in improved performance of Ni MOF. The structural and electrochemical characterizations reveal “why does a particular morphology exhibits better charge storage capacity?” The three electrode configuration experiments were conducted in aqueous electrolyte to evaluate the charge storage capacity. The results show that globules (∼1360 F g-1) perform better than nanoflower (∼850 F g-1), flakes (∼650 F g-1) and plates (∼450 F g-1) [4] respectively in 2M KOH at 0.5 A g-1. The reason is attributed to the low solution resistance (R sol) for globules, reduced charge transfer resistance (R ct) and the global and local n values of CPE. The synthesized material (Ni MOF) will be used as positive electrode material for flexible asymmetric supercapacitor. Recently, flexible state supercapacitors (FSSCs) have gained popularity due to their formability, flexibility and high energy density. Here, the objective is to increase energy density and power density by extending the operating potential window of the device. Hence, the aqueous electrolyte is substituted with PVDF based ionogels (ionic liquid gel polymer) to impart flexibility, bendability and high power density to FSSC. It is observed that the potential window improved remarkably from ~0.6 V (aqueous electrolytes) to ~5 V (ionic liquid). The reason is attributed to the absence of water, results in thermodynamic stability of the electrolyte. Also, the ionic liquid based FSSCs are non-flammable, non-toxic, thermally stable. In order to improve the conductivity and charge storage capacity some additives are incorporated in the gel polymer matrix. Herein, certain polar solvents are added to enhance the conductivity due to their high dielectric constant giving rise to faster ionic dissociation. MOF based flexible supercapacitors are fabricated and tested for their energy and power densities in conjunction with electrochemical and structural characteristics . References: [1] A. E. Baumann, D. A. Burns, B. Liu, and V. S. Thoi, “Metal-Organic Framework Functionalization and Design Strategies for Advanced Electrochemical Energy Storage Devices,” Commun. Chem., vol. 2, no. 1, pp. 1–14, 2019. [2] Y. Xiao, W. Wei, M. Zhang, S. Jiao, Y. Shi, and S. Ding, “Facile Surface Properties Engineering of High-Quality Graphene: Toward Advanced Ni-MOF Heterostructures for High-Performance Supercapacitor Electrode,” ACS Appl. Energy Mater., vol. 2, no. 3, pp. 2169–2177, 2019. [3] J. Klinowski, F. A. Almeida Paz, P. Silva, and J. Rocha, “Microwave-Assisted Synthesis of Metal-Organic Frameworks,” Dalt. Trans., vol. 40, no. 2, pp. 321–330, 2011. [4] G. Chaturvedi, R. Jaiswal, S.A. Ilangovan, S. Sujatha, K.S Ajeesh, S. S. V. Tatiparti, "A Systematic Approach for Selecting Suitable Morphologies for Supercapacitor Applications through Morphlogical Stability Map- A Case of Ni-MOF," Ceramics International, vol. 49, pp.9382-9394,2023.

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Wen, Lili, Dong’e Wang, Chenggang Wang, Feng Wang, Dongfeng Li e Kejian Deng. "A 3D porous zinc MOF constructed from a flexible tripodal ligand: Synthesis, structure, and photoluminescence property". Journal of Solid State Chemistry 182, n. 3 (marzo 2009): 574–79. http://dx.doi.org/10.1016/j.jssc.2008.11.031.

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Hess, Samuel C., Robert N. Grass e Wendelin J. Stark. "MOF Channels within Porous Polymer Film: Flexible, Self-Supporting ZIF-8 Poly(ether sulfone) Composite Membrane". Chemistry of Materials 28, n. 21 (20 ottobre 2016): 7638–44. http://dx.doi.org/10.1021/acs.chemmater.6b02499.

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Ashour, Radwa M., Ahmed F. Abdel-Magied, Qiong Wu, Richard T. Olsson e Kerstin Forsberg. "Green Synthesis of Metal-Organic Framework Bacterial Cellulose Nanocomposites for Separation Applications". Polymers 12, n. 5 (13 maggio 2020): 1104. http://dx.doi.org/10.3390/polym12051104.

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Metal organic frameworks (MOFs) are porous crystalline materials that can be designed to act as selective adsorbents. Due to their high porosity they can possess very high adsorption capacities. However, overcoming the brittleness of these crystalline materials is a challenge for many industrial applications. In order to make use of MOFs for large-scale liquid phase separation processes they can be immobilized on solid supports. For this purpose, nanocellulose can be considered as a promising supporting material due to its high flexibility and biocompatibility. In this study a novel flexible nanocellulose MOF composite material was synthesised in aqueous media by a novel and straightforward in situ one-pot green method. The material consisted of MOF particles of the type MIL-100(Fe) (from Material Institute de Lavoisier, containing Fe(III) 1,3,5-benzenetricarboxylate) immobilized onto bacterial cellulose (BC) nanofibers. The novel nanocomposite material was applied to efficiently separate arsenic and Rhodamine B from aqueous solution, achieving adsorption capacities of 4.81, and 2.77 mg g‒1, respectively. The adsorption process could be well modelled by the nonlinear pseudo-second-order fitting.

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He, Xiang. "Adjusting the Catalytic Performance of MIL-88B(Fe/Co) through Structural Transitions". ECS Meeting Abstracts MA2024-01, n. 35 (9 agosto 2024): 1945. http://dx.doi.org/10.1149/ma2024-01351945mtgabs.

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Metal-organic frameworks (MOFs) are a family of highly porous materials, which are composed of metal-based nodes and organic ligands. Thanks to the large surface areas and tunable chemical functionalities, MOFs are emerging as excellent catalysts for the sector of renewable energy. Of particular interest, the structures of certain MOFs are highly flexible, allowing for reversible structural transitions upon the stimuli from various external sources. Such stimuli-responsive behaviors of MOFs create new opportunities to design functional materials for switchable catalysis. Nevertheless, the exploration of the flexible MOF-based catalysts is still at a nascent stage. Herein, to advance the fundamental understanding of how the dynamic behaviors of flexible MOFs could affect the catalytic performance, first-principles calculations were carried out using the density functional theory, where a bimetallic MOF, MIL-88B(Fe/Co), was selected as a model structure. Results showed that the lattice contraction can result in twisted ligands as well as the rotary metal nodes, which subsequently lead to variations of the free energy diagrams for the oxygen evolution reaction, demonstrating the critical role of structural flexibility in determining the energy barriers during the elementary steps. Further analysis using the pair distribution function and electron localization function confirmed the rigid short-range order of MOFs during the structural transitions, as well as the tunable guest-host interactions upon lattice contraction/expansion, which could be responsible for the observed differences in the energy barriers during catalysis. Overall, the findings from this work offer new insights into the catalyst design for the modulated production of renewable fuels. Reference: CrystEngComm, 2023, 25, 6441 - 6448

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Coudert, Francois-Xavier. "Assessing and predicting flexibility in MOFs with molecular simulation". Acta Crystallographica Section A Foundations and Advances 70, a1 (5 agosto 2014): C1125. http://dx.doi.org/10.1107/s2053273314088743.

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Much attention has recently been focused flexible metal-organic frameworks (MOFs), or Soft Porous Crystals, that behave in a remarkable stimuli-responsive fashion upon guest adsorption, temperature, or mechanical pressure. It was shown that these different stimuli-driven structural transitions can be rationalized by combining an understanding of adsorption thermodynamics and mechanical properties of the host phases. We will show how the combination of a large range of molecular simulation methods can assess the extent of flexibility of known MOF structures, as well as give physical insight into their deformation mechanisms, and predict the occurrence of new phases. In particular, we will demonstrate the breathing nature of recently synthesized MOFs CAU-13 and NOTT-300, that have not been observed experimentally.

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Li, Longxiao, Yufei Han, Yuzhe Zhang, Weijia Wu, Wei Du, Guojun Wen e Siyi Cheng. "Laser-Induced Graphene Decorated with MOF-Derived NiCo-LDH for Highly Sensitive Non-Enzymatic Glucose Sensor". Molecules 29, n. 23 (29 novembre 2024): 5662. https://doi.org/10.3390/molecules29235662.

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Designing and fabricating a highly sensitive non-enzymatic glucose sensor is crucial for the early detection and management of diabetes. Meanwhile, the development of innovative electrode substrates has become a key focus for addressing the growing demand for constructing flexible sensors. Here, a simple one-step laser engraving method is applied for preparing laser-induced graphene (LIG) on polyimide (PI) film, which serves as the sensor substrate. NiCo-layered double hydroxides (NiCo-LDH) are synthesized on LIG as a precursor, utilizing the zeolitic imidazolate framework (ZIF-67), and then reacted with Ni(NO3)2 via solvent-thermal methods. The sensitivity of the non-enzymatic electrochemical glucose sensor is significantly improved by employing NiCo-LDH/LIG as the sensing material. The porous and interconnected structure of NiCo-LDH, derived from ZIF-67, enhances the accessibility of electrochemically active sites, while the incorporation of LIG ensures exceptional conductivity. The combination of NiCo-LDH with LIG enables efficient electron transport, leading to an increased electrochemically active surface area and enhanced catalytic efficiency. The fabricated electrode achieves a low glucose detection limit of 0.437 μM and demonstrates a high sensitivity of 1141.2 and 631.1 μA mM−2 cm−2 within the linear ranges of 0–770 μM and 770–1970 μM, respectively. Furthermore, the NiCo-LDH/LIG glucose sensor demonstrates superior reliability and little impact from other substances. A flexible integrated LIG-based non-enzymatic glucose sensor has been developed, demonstrating high sensitivity and suggesting a promising application for LIG-based chemical sensors.

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Zhu, Rongyue, Mengru Cai, Tingting Fu, Dongge Yin, Hulinyue Peng, Shilang Liao, Yuji Du, Jiahui Kong, Jian Ni e Xingbin Yin. "Fe-Based Metal Organic Frameworks (Fe-MOFs) for Bio-Related Applications". Pharmaceutics 15, n. 6 (26 maggio 2023): 1599. http://dx.doi.org/10.3390/pharmaceutics15061599.

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Metal–organic frameworks (MOFs) are porous materials composed of metal ions and organic ligands. Due to their large surface area, easy modification, and good biocompatibility, MOFs are often used in bio-related fields. Fe-based metal–organic frameworks (Fe-MOFs), as important types of MOF, are favored by biomedical researchers for their advantages, such as low toxicity, good stability, high drug-loading capacity, and flexible structure. Fe-MOFs are diverse and widely used. Many new Fe-MOFs have appeared in recent years, with new modification methods and innovative design ideas, leading to the transformation of Fe-MOFs from single-mode therapy to multi-mode therapy. In this paper, the therapeutic principles, classification, characteristics, preparation methods, surface modification, and applications of Fe-MOFs in recent years are reviewed to understand the development trends and existing problems in Fe-MOFs, with the view to provide new ideas and directions for future research.

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Won, Eun-Seo, e Jong-Won Lee. "Biphasic Solid Electrolytes with Homogeneous Li-Ion Transport Pathway Enabled By Metal-Organic Frameworks". ECS Meeting Abstracts MA2022-01, n. 55 (7 luglio 2022): 2248. http://dx.doi.org/10.1149/ma2022-01552248mtgabs.

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Solid-state batteries based on nonflammable inorganic solid electrolytes provide a promising technical solution that can resolve the safety issues of current lithium-ion batteries. Biphasic solid electrolytes comprising Li7La3Zr2O12 (LLZO) garnet and polymer have been attracting significant interest for solid-state Li batteries because of their mechanical robustness and enhanced Li+ conductivity, compared to conventional polymer electrolytes. Furthermore, the hybridization allows for the fabrication of thin and large-area electrolyte membranes without the need for high-temperature sintering of LLZO. However, the non-uniform distribution of LLZO particles and polymer species in biphasic electrolytes may cause uneven Li+ conduction, which results in poor interfacial stability with electrodes during repeated charge–discharge cycling. In this study, we report a biphasic solid electrolyte with homogeneous Li+ transport pathway achieved by a metal–organic framework (MOF) layer. To regulate and homogenize the Li+ flux across the interface between the electrolyte and electrode, a free-standing, biphasic solid electrolyte membrane is integrated with the MOF nanoparticle layer. A mixture of plastic crystal (PC) and polymeric phase is infused into porous networks of the MOF-integrated electrolyte membrane, producing the percolating Li+ conduction pathways. The MOF-integrated electrolyte membrane is found to form the smooth and uniform interface with nanoporous channels in contact with the electrodes, effectively facilitating homogeneous Li+ transport. A solid-state battery with the MOF-integrated electrolyte membrane shows the enhanced rate-capability and cycling stability in comparison to the battery with the unmodified biphasic electrolyte. This study demonstrates that the proposed electrolyte design provides an effective approach to improving the interfacial stability of biphasic electrolytes with electrodes for long-cycling solid-state batteries. [1] H.-S. Shin, W. Jeong, M.-H. Ryu, S.W. Lee, K.-N. Jung, J.-W. Lee, Electrode-to-electrode monolithic integration for high-voltage bipolar solid-state batteries based on plastic-crystal polymer electrolyte, Chem. Eng. J, published online. [2] T. Jiang, P. He, G. Wang, Y. Shen, C.-W. Nan, L.-Z. Fan, Solvent-free synthesis of thin, flexible, nonflammable garnet-based composite solid electrolyte for all-solid-state lithium batteries, Adv. Energy Mater. 10 (2020) 1903376.

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Wang, Xiao, Yanan Wang, Yali Liu, Xiyue Cao, Feifei Zhang, Jianfei Xia e Zonghua Wang. "MOF-derived porous carbon nanozyme-based flexible electrochemical sensing system for in situ and real-time monitoring of H2O2 released from cells". Talanta 266 (gennaio 2024): 125132. http://dx.doi.org/10.1016/j.talanta.2023.125132.

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Wang, Xin, Guo-Dong Han e Juan Wang. "Polypyrrole Coated Al-TDC Composite Structure as Lithium-Sulfur Batteries Cathode". Nano 16, n. 06 (20 maggio 2021): 2150060. http://dx.doi.org/10.1142/s1793292021500600.

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Abstract (sommario):

Due to the high theoretical capacity of sulfur (1675[Formula: see text]mAh[Formula: see text][Formula: see text], low cost and environmental friendliness, lithium-sulfur batteries have shown broad prospects in future energy conversion and storage systems. However, the shuttle effect and insulating properties of sulfur restrict its practical application. Herein, we report a facile approach to fabricate Al-TDC@S-PPy composite material as lithium-sulfur battery electrode. In this strategy, a topological porous Al-TDC ([Formula: see text],5-thiophenedicarboxylate) with 8-connected clusters is reported, which can provide strong adsorption for dissolved intermediate polysulfides and alleviate volume expansion. Meanwhile, Polypyrrole, (PPy) as a conductive and flexible additive to expedite electron transport, improves electrical conductivity. Consequently, the Al-TDC@S-PPy composite cathode exhibits a higher initial specific capacity (1310.4[Formula: see text]mAh[Formula: see text][Formula: see text] at 0.2[Formula: see text]C). The final reversible capacity is 411.0[Formula: see text]mAh[Formula: see text][Formula: see text] after 200 cycles at 1 C. We can extend this strategy to other metal-organic frameworks (MOFs) and manufacture MOF/conductive polymer composite electrodes for high-performance lithium-sulfur batteries.

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Basu, Aniruddha, Kingshuk Roy, Neha Sharma, Shyamapada Nandi, Ramanathan Vaidhyanathan, Sunit Rane, Chandrashekhar Rode e Satishchandra Ogale. "CO2 Laser Direct Written MOF-Based Metal-Decorated and Heteroatom-Doped Porous Graphene for Flexible All-Solid-State Microsupercapacitor with Extremely High Cycling Stability". ACS Applied Materials & Interfaces 8, n. 46 (11 novembre 2016): 31841–48. http://dx.doi.org/10.1021/acsami.6b10193.

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35

Javed, Muhammad Sufyan, Nusrat Shaheen, Shahid Hussain, Jinliang Li, Syed Shoaib Ahmad Shah, Yasir Abbas, Muhammad Ashfaq Ahmad, Rizwan Raza e Wenjie Mai. "An ultra-high energy density flexible asymmetric supercapacitor based on hierarchical fabric decorated with 2D bimetallic oxide nanosheets and MOF-derived porous carbon polyhedra". Journal of Materials Chemistry A 7, n. 3 (2019): 946–57. http://dx.doi.org/10.1039/c8ta08816k.

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Mohan, Gopalakrishnan, e Soorathep Kheawhom. "3D MOF Derived Porous Nanorods like Cation Defect-Rich Ni_0.6Fe_2.4O₄@NC Efficient Electrocatalyst Enables Robust Rechargeable Zinc-Air Batteries". ECS Meeting Abstracts MA2024-02, n. 9 (22 novembre 2024): 1423. https://doi.org/10.1149/ma2024-0291423mtgabs.

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Abstract (sommario):

Electrochemical energy storage devices with consistent performance, high power output, and energy density are urgently required to meet global energy demand. Zinc-air batteries are quickly gaining popularity as potential energy sources for green energy storage technologies. The air electrodes, combined with some oxygen electrocatalysts, have a significant impact on the cost and performance of Zn-air batteries. However, designing and fabricating efficient electrocatalysts remains a challenge. Because of their unique structural flexibility and uniformly dispersed active sites, metal-organic frameworks (MOFs) have emerged as appealing precursors for the synthesis of a wide range of advanced functional materials. Our research suggests using flexible multi-carboxylic acids and bipyridine ligands to create nanorods like NiFe@MOFs with multiple coordination modes and fascinating architectures. MOF precursors were post-annealed in argon at 750 °C, yielding a cation deficient Ni0.6Fe2.4O4@NC electrocatalyst. This 3D electrocatalyst effectively reduces oxygen (E1/2 = 0.85 V) and evolves oxygen (η10 = 207 mV@10 mA cm-2). Furthermore, a rechargeable zinc-air battery with Ni0.6Fe2.4O4@NC as the cathode demonstrated a high open circuit voltage (OCV) of 1.5 V, a peak power density of 194.6 mW cm-2, and exceptional long-term cycling stability over 300 h (1800 cycles, 10 mA cm-2). The flexible solid-state zinc-air battery demonstrated power density of 68.5 mW cm-2 and long-term durability over 35 h at 5 mA cm-2. The proposed strategy allows for the rational design of cation defect-rich spinel structures attached to ultra-thin, N-doped graphitic carbon sheets in order to enhance active site availability and mass electron transport. Figure 1

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Hou, Xinyu, Lijian Sun, Ying Hu, Xianhui An e Xueren Qian. "De-Doped Polyaniline as a Mediating Layer Promoting In-Situ Growth of Metal–Organic Frameworks on Cellulose Fiber and Enhancing Adsorptive-Photocatalytic Removal of Ciprofloxacin". Polymers 13, n. 19 (27 settembre 2021): 3298. http://dx.doi.org/10.3390/polym13193298.

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New kinds of inorganic–organic hybrid porous materials, metal–organic frameworks (MOFs), have shown great application potential in various fields, but their powdery nature limits their application to a certain extent. As a green and renewable biomass material in nature, cellulose fiber (CelF) has the advantages of biodegradability, recyclability and easy processing, and can be used as an excellent flexible substrate for MOFs. However, the efficient deposition of MOFs on CelF is still a great challenge for the development of this new material. Herein, polyaniline (PANI) and de-doped PANI (DPANI) with rich functional groups as a mediating layer was proposed to promote the in-situ growth and immobilization of some MOFs on CelF. The PANI (especially DPANI) layer greatly promoted the deposition of the four MOFs, and more encouragingly, significantly promoted the in-situ growth and nanocrystallization of MIL-100(Fe). MIL-100(Fe)@DPANI@CelF was selected as an adsorbent-photocatalyst to be used for the adsorptive-photocatalytic removal of ciprofloxacin (CIP) in water. The removal efficiency of CIP by MIL-100(Fe)@DPANI@CelF reached 82.78%, and the removal capacity of CIP was as high as 105.96 mg g−1. The study found that DPANI had a synergistic effect on both the in-situ growth of MIL-100(Fe) on CelF and the adsorption-photocatalysis of CIP in water. The universal platform of PANI-mediated in-situ growth and immobilization of MOFs on CelF constructed in this study widens the road for the development of MOF@CelF composites.

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Sousa, Antonio C. M., e Fangming Jiang. "SPH as an Inverse Numerical Tool for the Prediction of Diffusive Properties in Porous Media". Materials Science Forum 553 (agosto 2007): 171–89. http://dx.doi.org/10.4028/www.scientific.net/msf.553.171.

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Abstract (sommario):

Heat and mass transfer and fluid flow in porous media are usually characterized by, or associated with, the effective thermal conductivity, the effective mass diffusivity and the permeability, respectively. All these macroscopic quantities are conceptually established on a phenomenological “equivalence” basis. They may contain the influence of porous micro-structures upon the corresponding diffusive process; however, the detailed nature inside the porous medium is lumped and neglected. Pore scale numerical modelling has the potential of providing adequate meso-/micro- scale insight into the transport process in porous medium, as well as obtaining macroscopic properties, which can encompass the complex pore-structure details. Modelling heat/mass transfer and fluid flow in complicated porous micro-structures presents a major challenge to numerical methods due to their multiscale and multiphysics nature. A relatively-novel numerical technique - the meshless Lagrangian-based Smoothed Particle Hydrodynamics (SPH) method is thought to be capable of making a significant contribution to this research field. This work deals primarily with the SPH modelling of heat conduction and fluid flow in 2-D isotropic porous media. The porous matrix is formed by randomly including a different component into a base component. Various pore-structures are realized by changing the inclusion shape/size, or the relative arrangement condition between inclusions. Pore-scale heat transfer and fluid flow streams are visualized, and both heat transfer and fluid flow always follow, as expected, the paths of least resistance through the porous structures. In what concerns the effective thermal conductivity, for the porous media with the base component of larger bulk thermal conductivity, the “flexible” EMT model, which can accommodate, to some extent, the influence from the porous micro-structures on the effective thermal conductivity by adjusting the so-called flexible factor ff, gives effective thermal conductivities agreeable to the SPH predictions across the whole composition range if ff is taken to be ~ 4.5; the effective thermal conductivity shows a weak dependence on the inclusion shape/size and the relative arrangement condition between inclusions; however, for porous media with dispersed inclusions, which component has larger bulk thermal conductivity presents a strong effect upon the effective thermal conductivity. The SPH fluid flow simulation results confirm the macroscopic Darcy’s law to be valid only in the creeping flow regime; the dimensionless permeability (normalized by the squared characteristic dimension of the inclusions) is found to have an exponential dependence on the porosity within the intermediate porosity range, and the derived dimensionless permeability /""porosity relation is found to have only a minor dependence on either the relative arrangement condition between inclusions or the inclusion shape/area.

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Lin, Yung Jen, e Shin Yi Shen. "Fabrication of Alumina and Silicon Carbide Fibers from Carbon Fibers". Materials Science Forum 561-565 (ottobre 2007): 603–6. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.603.

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Abstract (sommario):

Carbon fibers of ~9 μ m in diameter were used as templates to fabricate alumina and silicon carbide fibers. The carbon fibers were placed in a vacuum furnace with aluminum and heated at 1100°C for 8 h to form aluminum carbide. Then, the aluminum carbide fibers were oxidized in air at 1500°C. The resulted fibers were hollow and the alumina layer was porous in the interior. To fabricate silicon carbide fiber, carbon fibers were reacted with Si at 1300°C -1500°C in Ar. The thickness of silicon carbide layers increased with reaction temperature and reaction time. Solid fibers could be obtained after reaction at 1400°C for 4 h. In contrast to porous alumina layer, the silicon carbide layer/fibers were dense. The porous alumina hollow fibers were fragile while the solid silicon carbide fibers were flexible. BET surface area measurements revealed that the porous alumina had surface area as high as ~100 m2/g.

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Liu, Ming Jun, Wei Xia, Zhao Yao Zhou, Pu Qing Chen, Jun Jun Wang e Yuan Yuan Li. "Mechanical Models and Numerical Simulation of Rolling Compaction for Metal Powders". Materials Science Forum 532-533 (dicembre 2006): 817–20. http://dx.doi.org/10.4028/www.scientific.net/msf.532-533.817.

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The rolling compaction can produce porous or dense strips with special functions. The mechanical behaviors in rolling compaction are hard to predict accurately and efficiently by traditional means. The numerical simulation based on the Finite Element Method (FEM) provides a flexible and efficient way for such problems. This paper introduces three-dimensional (3-D) FEM simulations for the rolling compaction of the iron matrix powders. The elliptical yield criterion, elasto-plastic constitutive relationship and the friction model were analyzed. Simulations were based on the second-developed user subroutine in MSC.Marc. Effects of friction and rolling velocity on the rolling force, distribution of the density and some other parameters were analyzed.

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Jafari, Reza, Marc Chameau, Masoud Farzaneh e Gelareh Momen. "Superhydrophobic and Highly Oleophilic Polystyrene Fibers (PS) with Delayed Freezing Time and Effective Oil Adsorption". Materials Science Forum 941 (dicembre 2018): 2232–36. http://dx.doi.org/10.4028/www.scientific.net/msf.941.2232.

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We present an efficient and simple approach for preparing superhydrophobic-superoleophilic polystyrene (PS) fibers via electrospinning. Bead-on-string fibers from a 5% PS solution and micro-sized fibers from a 20% PS solution were combined to achieve a surface having very high contact angle (about 160°) and low contact angle hysteresis. The presence of bead-on-string fibers increases the superhydrophobicity of the sorbent. The micro-sized PS fibers improve the mechanical properties of the electrospun mat through their elastic and flexible behavior. An evaluation of wettability at a low temperature (-10 oC) showed a delayed freezing time for water droplets on the superhydrophobic surface. Water droplets on a polished aluminum surface froze more quickly (about 6 seconds) than droplets on the fabricated superhydrophobic surface (about 500 seconds). Finally, the oil adsorption capacity of the developed superhydrophobic PS fibers, which have a porous surface structure, showed values of 69.1, 69.3 and 61.2 g/g for canola oil, olive oil and motor oil, respectively.

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Guglielmi, P. O., G. F. Nunes, M. Hablitzel, Dachamir Hotza e Rolf Janssen. "Production of Oxide Ceramic Matrix Composites by a Prepreg Technique". Materials Science Forum 727-728 (agosto 2012): 556–61. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.556.

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Ceramic matrix composites (CMCs) were developed to overcome the intrinsic brittleness and lack of reliability of monolithic ceramics. Their major advantages include high temperature capability, light weight, corrosion resistance and adequate damage tolerance. All-oxide Ceramic Matrix Composites (OCMCs) offer essential advantages with respect to long time stability in oxidizing atmospheres, when compared to their non-oxide counterparts. Nevertheless, there is at present almost no production concept which meets the requirements in view of cost and performance for these materials. This work aims at producing OCMCs by means of a more flexible production route. This is achieved by integrating well-known powder metallurgy routes with the prepreg technique, used at present for producing commercial high performance polymer matrix composites. The processing consists of the following steps: (a) infiltration of commercial alumina fiber fabrics (3M NextelTM610) with a liquid suspension of the matrix material; (b) lamination of the pre-infiltrated fiber textiles with a paraffin-based suspension for the formation of prepregs; (c) layup of prepregs; (d) warm-pressing for the consolidation of the green body; (e) debinding and (f) reaction bonding and/or sintering for synthesis of the oxide matrix. Pure alumina or Reaction Bonded Aluminum Oxide (RBAO) can be used as matrix materials and damage tolerance is achieved by the porous, weak-matrix approach. Microstructural analysis of a pure alumina composite fabricated by this route show good infiltration of fiber bundles and proves the good adhesion of prepregs during processing. Average strength value of 199 MPa in fiber direction is in good agreement with values presented in the literature for OCMCs produced by other techniques.

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Hui, Siyue, Huanzhi Zhang, Guangpeng Xu, Junhao Zhang, Fen Xu, Lixian Sun, Xiangcheng Lin et al. "Hierarchically porous and flexible BN/Co-MOF aerogel encapsulated paraffin for efficient dual-thermal insulation". Journal of Materials Chemistry A, 2025. https://doi.org/10.1039/d4ta07235a.

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44

Cai, Dongming, Zhuxian Yang, Rui Tong, Haiming Huang, Chuankun Zhang e Yongde Xia. "Binder‐Free MOF‐Based and MOF‐Derived Nanoarrays for Flexible Electrochemical Energy Storage: Progress and Perspectives". Small, 10 novembre 2023. http://dx.doi.org/10.1002/smll.202305778.

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AbstractThe fast development of Internet of Things and the rapid advent of next‐generation versatile wearable electronics require cost‐effective and highly‐efficient electroactive materials for flexible electrochemical energy storage devices. Among various electroactive materials, binder‐free nanostructured arrays have attracted widespread attention. Featured with growing on a conductive and flexible substrate without using inactive and insulating binders, binder‐free 3D nanoarray electrodes facilitate fast electron/ion transportation and rapid reaction kinetics with more exposed active sites, maintain structure integrity of electrodes even under bending or twisted conditions, readily release generated joule heat during charge/discharge cycles and achieve enhanced gravimetric capacity of the whole device. Binder‐free metal‐organic framework (MOF) nanoarrays and/or MOF‐derived nanoarrays with high surface area and unique porous structure have emerged with great potential in energy storage field and been extensively exploited in recent years. In this review, common substrates used for binder‐free nanoarrays are compared and discussed. Various MOF‐based and MOF‐derived nanoarrays, including metal oxides, sulfides, selenides, nitrides, phosphides and nitrogen‐doped carbons, are surveyed and their electrochemical performance along with their applications in flexible energy storage are analyzed and overviewed. In addition, key technical issues and outlooks on future development of MOF‐based and MOF‐derived nanoarrays toward flexible energy storage are also offered.

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Koutsianos, Athanasios, Roman Pallach, Louis Frentzel-Beyme, Chinmoy Das, Michael Paulus, Christian Sternemann e Sebastian Henke. "Breathing porous liquids based on responsive metal-organic framework particles". Nature Communications 14, n. 1 (14 luglio 2023). http://dx.doi.org/10.1038/s41467-023-39887-3.

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AbstractResponsive metal-organic frameworks (MOFs) that display sigmoidal gas sorption isotherms triggered by discrete gas pressure-induced structural transformations are highly promising materials for energy related applications. However, their lack of transportability via continuous flow hinders their application in systems and designs that rely on liquid agents. We herein present examples of responsive liquid systems which exhibit a breathing behaviour and show step-shaped gas sorption isotherms, akin to the distinct oxygen saturation curve of haemoglobin in blood. Dispersions of flexible MOF nanocrystals in a size-excluded silicone oil form stable porous liquids exhibiting gated uptake for CO2, propane and propylene, as characterized by sigmoidal gas sorption isotherms with distinct transition steps. In situ X-ray diffraction studies show that the sigmoidal gas sorption curve is caused by a narrow pore to large pore phase transformation of the flexible MOF nanocrystals, which respond to gas pressure despite being dispersed in silicone oil. Given the established flexible nature and tunability of a range of MOFs, these results herald the advent of breathing porous liquids whose sorption properties can be tuned rationally for a variety of technological applications.

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Zhou, Xingliao, Xiaoliang Chen, Bo Yang, Sihai Luo, Meiling Guo, Ningli An, Hongmiao Tian, Xiangming Li e Jinyou Shao. "Advancements in Functionalizable Metal‐Organic Frameworks for Flexible Sensing Electronics". Advanced Functional Materials, 11 marzo 2025. https://doi.org/10.1002/adfm.202501683.

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AbstractFlexible sensing electronics, with good lightweight and flexibility, can maintain excellent sensing capability while fitting complex curved surfaces, having important applications in wearable devices, medical health monitoring, and robotics. The rapid advancement of metal‐organic frameworks (MOFs) has created the prospect of additional improvements in flexible sensors. The porous structure brings them a high specific surface area, meaning that when used as sensitive materials for sensors, excellent sensitivity and selectivity can be achieved. Meanwhile, the sensing performance and stability of MOF‐based flexible sensors can be further enhanced by modifying MOFs’ structure or compounding them with other materials, which is crucial for manufacturing flexible sensors utilized in complex working conditions. Herein, the advancement of MOFs and MOF‐based flexible sensors is systematically reviewed. First, the common series of MOFs, the preparation and modification methods, and the highly conductive MOFs are introduced. MOFs’ application in flexible sensing is then expounded, including self‐powered mechanical sensing, gas sensing, liquid analyte sensing, and multi‐target/mode sensing. It is believed that as MOFs with better response capabilities are developed and manufacturing processes advance, MOF‐based flexible sensors are expected to be more widely used in the future and promote the further development of technologies such as human‐computer interaction technology.

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Zhang, Lingyue, Ruiying Li, Shuang Zheng, Hai Zhu, Moyuan Cao, Mingchun Li, Yaowen Hu, Li Long, Haopeng Feng e Chuyang Y. Tang. "Hydrogel-embedded vertically aligned metal-organic framework nanosheet membrane for efficient water harvesting". Nature Communications 15, n. 1 (11 novembre 2024). http://dx.doi.org/10.1038/s41467-024-54215-z.

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AbstractHighly porous metal-organic framework (MOF) nanosheets have shown promising potential for efficient water sorption kinetics in atmospheric water harvesting (AWH) systems. However, the water uptake of single-component MOF absorbents remains limited due to their low water retention. To overcome this limitation, we present a strategy for fabricating vertically aligned MOF nanosheets on hydrogel membrane substrates (MOF-CT/PVA) to achieve ultrafast AWH with high water uptake. By employing directional growth of MOF nanosheets, we successfully create superhydrophilic MOF coating layer and pore channels for efficient water transportation to the crosslinked flexible hydrogel membrane. The designed composite water harvester exhibits ultrafast sorption kinetics, achieving 91.4% saturation within 15 min. Moreover, MOF-CT/PVA exhibits superior solar-driven water capture-release capacity even after 10 cycles of reuse. This construction approach significantly enhances the water vapor adsorption, offering a potential solution for the design of composite MOF-membrane harvesters to mitigate the freshwater crisis.

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SHARMA, VIVEK, VINOD KUMAR VASHISTHA e DIPAK KUMAR DAS. "MOFs-DERIVED METAL OXIDES FOR FLEXIBLE SUPERCAPACITORS". Surface Review and Letters, 4 marzo 2022. http://dx.doi.org/10.1142/s0218625x22300064.

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As research on new technologies for the creation of flexible electrochemical energy storage systems continues, they are widely used in industries such as public portable devices, mobile electronics, and electronic products worldwide. Flexible supercapacitors (FSCs) are widely used in wearable electronics and medical fields, with high power density, excellent mechanical integrity and cycle stability. Researchers devoted a lot of time in recent years promoting several kinds of transition metal oxides (TMOs) for SCs. Organometallic frameworks (MOFs) are commonly utilized for the production of metal oxide-based electrodes for high-performance SCs as precursors or templates. These MOF-based metal oxides have a porous and adjustable structure, a large specific surface area, strong electrical conductivity, and good electrochemical stability, and they fulfil the specific capacitance and long-cycle power requirements of electrochemical double-layer capacitors. The latest developments in the production and application of MOF-derived metallic oxide compounds in FSCs are summarized in this study.

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Zhang, Qin, Shanjia Pan, Zhipeng Wang, Yanqin Yang e Songzhan Li. "MOF-derived porous Ni3S4/CoS nanosheet arrays for flexible supercapacitor electrode". Ionics, 1 novembre 2023. http://dx.doi.org/10.1007/s11581-023-05267-6.

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50

Potdar, Aparna, Soumava Biswas, Dev Kumar Thapa, Bharat Bhanudas Kale, Milind V. Kulkarni e Murthy Chavali. "Flexible PVDF‐HFP, Nickel MOF‐based Hybrid Membrane as an Efficient Electrolyte for Lithium‐Ion Batteries". European Journal of Inorganic Chemistry, 12 marzo 2025. https://doi.org/10.1002/ejic.202500075.

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The present investigation demonstrates a highly stable composite polymer electrolyte (CPE) membrane, designed to enhance the performance of solid‐state lithium‐ion batteries. This CPE membrane has been fabricated by the blending of Ni‐BDC MOF (BDC: 1,4‐benzenedicarboxylate), lithium salt, and PVDF‐HFP (poly (vinylidene fluoride‐co‐hexa fluoropropylene)). The XRD of the CPE membrane clearly shows the presence of Ni‐BDC MOF. The mechanical properties and flame test validate the robustness of the membrane. The detailed morphological study of the membrane shows the presence of a porous surface and protection exhibits a layered structure. The CPE membrane exhibits a high ionic conductivity of 1.5 × 10−4 S/cm at room temperature and 5.99 × 10−4 S/cm at 55°C. Considering the high ionic conductivity, CPE membrane has been used as a composite polymer electrolyte for Li‐ion cells. The cell shows a 149 mAh/g discharge capacity @1C with 85% retention over 300 cycles. Further, it delivered a capacity of around 128.55 mAh/g @ 2C with 81% capacity retention at 200 cycles. This enhancement is attributed to the incorporation of Ni‐BDC MOF, which has a porous and layered structure that might significantly improve the Li ion conduction path.

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