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Characterization of the Properties of Inorganic Membrane Materials
Release time:
2022-11-09 11:45
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1. Chemical stability
Inorganic membranes exhibit excellent chemical stability and can operate over a broad pH range. Their chemical stability is primarily determined by the properties of the membrane material, such as its crystal structure and chemical bonding. For example, α‑Al₂O₃ membranes demonstrate superior stability compared to γ‑Al₂O₃ membranes. Furthermore, the stability of porous membranes is also influenced by their pore size and specific surface area.
The chemical stability of inorganic membranes is characterized by their resistance to acids and bases, which is assessed by measuring the membrane’s mass loss under specified conditions—namely, exposure to acidic or alkaline solutions, elevated temperatures, and prolonged durations. For example, a sample may be washed with Freon for 5 minutes, dried at 200°C for 2 hours, ultrasonically cleaned in pure water, dried again, and then immersed in a 35% HCl solution at 25°C to remove air bubbles from the membrane pores. The relationship between the sample’s mass and immersion time is then measured, and the extent of membrane corrosion is calculated. The table below compares the acid‑resistance of several membrane materials. It can be seen that crystalline, phase‑stable Al₂O₃ exhibits superior acid resistance compared to PTFE and stainless steel.
2. Surface Properties
The surface properties of inorganic membranes are primarily determined by the membrane material itself, the operating conditions, and the surrounding medium, exerting a significant influence on permeation and separation performance. For liquid‑separation membranes, surface properties are mainly characterized by the membrane’s surface charge, whereas for gas‑separation membranes, they are reflected in the membrane’s surface adsorption characteristics. Membrane charge is typically quantified by the zeta potential, which is measured by assessing the electrical potential of the membrane material (or feedstock). Surface properties of gas‑separation membranes are evaluated using conventional gas adsorption–desorption techniques. Understanding the surface properties of inorganic membranes lays the foundation for elucidating their pervaporation and separation mechanisms and provides a basis for membrane modification and performance enhancement.
3. Mechanical Strength
Inorganic membranes exhibit high mechanical strength, yet to date there is no standardized testing method for their reliable characterization. Currently, the prevailing approach relies on methods developed for assessing the mechanical strength of inorganic materials, typically expressed in terms of flexural strength, compressive strength, burst strength, and bending strength.
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In accordance with the requirements of the “Notice from the Provincial Department of Science and Technology on the Nomination Process for the 2024 Jiangsu Provincial Science and Technology Awards” (Document No. Su Ke Zi Fa [2025] No. 90), we hereby publicly announce the relevant information regarding the 2024 Jiangsu Provincial Science and Technology Award nomination project—“Inorganic Membrane‑Based Distributed‑Enhanced Multiphase Catalytic Reaction Technology and Complete Sets of Equipment”—in which our unit’s Fan Yiqun is participating (see attachment). The public notice period runs from May 30, 2025, to June 5, 2025, lasting seven calendar days.
In accordance with the requirements of the “Notice of the Jiangsu Provincial Department of Science and Technology on the Nomination for the 2023 Jiangsu Provincial Science and Technology Awards” (Sukechengfa [2024] No. 18), we hereby publicly announce relevant information regarding the 2023 Jiangsu Provincial Science and Technology Award nomination project—“Inorganic Membrane‑Based Distributed‑Enhanced Multiphase Catalytic Reaction Technology and Complete Sets of Equipment”—in which Fan Yiqun of our institution is a participant (see attachment). The public notice period runs from February 21, 2024, to February 27, 2024, lasting seven calendar days.
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The research institution approved by Nanjing is also an independent legal entity of the first professional research institute of Jiangsu Industrial Technology Research Institute Membrane Science and Technology Research Institute, which is positioned as the organizer of membrane material industry cultivation.
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