On the hydrophobicity/hydrophilicity of hierarchically porous ZIFs

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-01-25 DOI:10.1016/j.micromeso.2025.113513

Eder Amayuelas , Zhi Xu , Le Li , Paul Iacomi , Yaroslav Grosu

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引用次数: 0

Abstract

Among MOFs, zeolitic imidazolate frameworks (ZIFs) are particularly notable for their zeolite-like structures and microporous properties, which are crucial for gas separation, catalytic activities, and energy applications. However, their microporous nature can hinder diffusion in certain applications. Recent efforts have focused on incorporating mesoporosity into ZIFs, enhancing their properties for diffusion-limited processes. This raises a question on the hydrophobicity/hydrophilicity of the formed mesoporosity, which is crucial for the applicability of such hierarchical MOFs in terms of their transport and chemical properties. In this study, we investigate the hydrophobicity/hydrophobicity of various hierarchical meso-microporous samples of ZIF-8 MOF (mZIF) by means of water intrusion-extrusion porosimetry. Different synthesis routes, precursor batches, and particle sizes were employed to evaluate the effects of mesoporosity on intrusion pressure, volume, and stability. The results reveal that while micropores of ZIF-8 maintain their hydrophobic nature, the mesopores are hydrophilic and are wetted by water spontaneously under ambient conditions. By this study, we demonstrate that the H₂O intrusion-extrusion technique represents an accurate technique to independently access the hydrophobicity of hierarchical meso-microporous MOFs.

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.