The family of zeolitic-imidazole framework (ZIF) materials is currently considered for the challenging separation of C4 hydrocarbons. However, yet, the microscopic diffusion mechanism for these hydrocarbons in these narrow gate porous materials remains elusive by conventional methods due to its very slow nature. Experimental (solid-state H nuclear magnetic resonance-NMR) and computational (molecular dynamics-MD) approaches were applied together to derive slow diffusional dynamics of -butane and 1-butene in ZIF-8. By means of the H NMR technique, we evidenced the presence of two adsorption sites for the guests localized inside the cages of ZIF-8 and in the vicinity of the gates. We characterized the molecular mobility at each site and revealed that the translational intercage diffusion is realized by a slow directional motion associated with the gate-crossing. MD simulations provide an in-depth analysis of the diffusion and fully support the proposed dynamics picture for both -butane and 1-butene. These calculations enable the derivation of the diffusivity and barriers for the long-range diffusion of both hydrocarbons in ZIF-8 and unraveled the microscopic diffusion mechanism implying intracage and intercage motions. We show that this NMR approach combined with modeling is a valuable tool to probe the molecular mobility for slow diffusing species in ordered cagelike porous frameworks.
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http://dx.doi.org/10.1021/acsami.1c08529 | DOI Listing |
J Nanobiotechnology
January 2025
Department of Laboratory, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710032, China.
Background: Cardiac fibrosis plays a critical role in the progression of various forms of heart disease, significantly increasing the risk of sudden cardiac death. However, currently, there are no therapeutic strategies available to prevent the onset of cardiac fibrosis.
Methods And Results: Here, biomimetic ATP-responsive nanozymes based on genetically engineered cell membranes are adapted to specifically recognize activated cardiac fibroblasts (CFs) for the treatment of cardiac fibrosis.
Curr Microbiol
December 2024
Bionanomaterials Research Lab, Department of Nanoscience and Technology, Alagappa University, Karaikudi, Tamil Nadu, India.
Food Packaging using antibacterial substances plays a vital role in food industry in controlling contamination caused by food borne pathogens. Stability and pH dependent degradation characteristics of zeolitic imidazole framework-8 (ZIF-8) makes its suitable candidate for biomedical applications. The present study focuses on thyme essential oil (TEO) encapsulated in ZIF-8 to achieve a synergistic antibacterial effect and prolonged drug release, aiming to extend the shelf life of food products.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Institute of Materials Chemistry, Technische Universität Wien, 1060, Vienna, Austria.
Currently, lack of ways to engineer specific and well-defined active sites in zeolitic imidazolate frameworks (ZIFs) limits our fundamental knowledge with respect to the mechanistic details for (photo)electrocatalytic hydrogen evolution reaction (HER). Here, we introduce the open metal sites into ZIFs through the selective ligand removal (SeLiRe) strategy, comprehensively characterize the altered structural and electronic features, and evaluate their role in HER. In situ electrochemical analysis and X-ray absorption spectroscopy reveal the formation of high-valence HO-Zn-N sites through the binding of Zn-N with electrolyte hydroxide.
View Article and Find Full Text PDFFood Chem X
December 2024
State Key Laboratory of Southwestern Chinese Medicine Resources, Pharmacy College, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China.
Glyphosate (Gly) is a widely-used herbicide in food production, while, the residue of which due to the long-term and excessive overspray poses serious threats to public health. The development of reliable methods for its sensitive detection is of great urgency. In this study, a novel ratiometric fluorescent nanosensor by encapsulating N-doped carbon dots (N-CDs) and gold nanoclusters (AuNCs) in zeolitic imidazole framework-8 (ZIF-8) as the dual-emissive fluorescence probes at 410 and 650 nm, respectively, was constructed for Gly detection.
View Article and Find Full Text PDFBiotechnol Lett
November 2024
Department of Chemistry, Boğaziçi University, Bebek, 34342, İstanbul, Türkiye.
Microbial fuel cells (MFCs) utilize the metabolic activities of microorganisms, through which the chemical energy is directly converted into electrical energy. Bacteria produce electrons by means of oxidation of organic/inorganic substrates within the MFCs. Metal organic frameworks (MOFs) that are porous coordination polymers have gained much interest in the field of efficient catalysts due to their unique characteristics.
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