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Preparation and pore forming mechanism of a NiCu alloy porous paper membrane.

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Title: Preparation and pore forming mechanism of a NiCu alloy porous paper membrane.
Authors: Feng, Luli1 (AUTHOR), Xu, Ziyi1 (AUTHOR), Yu, Linping1,2 (AUTHOR) linping_yu@csust.edu.cn, Gao, Haiyan1 (AUTHOR), Xie, Fengwei1 (AUTHOR), He, Yuehui1 (AUTHOR) yuehui@csu.edu.cn, Shen, Weijun3 (AUTHOR)
Source: Journal of Alloys & Compounds. Jan2025, Vol. 1010, pN.PAG-N.PAG. 1p.
Subjects: Kirkendall effect, Porous materials, Porous metals, Aluminum oxide, Surface diffusion
Abstract: Although significant progress has been made in the research of related technologies for metal porous membranes, their high rigidity and low flux still limit their widespread applications in gas-solid and liquid-solid separations. This work reported a flexible NiCu alloy porous paper membrane with controllable pore size and high flux achieved through the extreme Kirkendall effect. With the help of K 2 SO 4 , the Kirkendall effect between Ni powder and Cu foil is greatly enhanced through the path of surface diffusion. As a space-holder, the K 2 SO 4 powder effectively reduces the shrinkage and densification of the Ni powders, ensuring sufficient surface diffusion channels, and promoting the formation of connected holes in the porous membrane skeleton. The results show that the uniformity of pore size distribution in the porous membranes can be precisely controlled by parameters including the sintering process, the initial composition of K 2 SO 4 , etc. Finally, a NiCu alloy porous paper membrane with a thickness of 60 µm is obtained, in which the pore size and air permeability are analyzed to be 12.93 µm and 1419.2 m3·m−2·kPa−1·h−1, respectively. In addition, the flexible NiCu alloy porous paper membrane shows good chemical stability in HF + H 2 SO 4 mixed solution. And the membrane can efficiently separate the solid particles from the suspension with Al 2 O 3 powder. This research provides a new approach and inspiration for the development of metal separation membranes applied in harsh environments. [Display omitted] • NiCu alloy porous paper membranes with high flux, controllable pore size and excellent flexibility were designed and prepared. • The pore structure of membranes can be controlled by adjusting sintering process, content and particle size of K 2 SO 4 powder. • The pore sources are extreme Kirkendall effect pores, pore occupied by K 2 SO 4 and interstitial pores. • NiCu alloy porous paper membranes have good corrosion resistance in the solution containing H 2 SO 4 and HF. • NiCu alloy porous paper membranes are highly efficient and precise in solid-liquid separation of suspension with Al 2 O 3 powder. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Although significant progress has been made in the research of related technologies for metal porous membranes, their high rigidity and low flux still limit their widespread applications in gas-solid and liquid-solid separations. This work reported a flexible NiCu alloy porous paper membrane with controllable pore size and high flux achieved through the extreme Kirkendall effect. With the help of K 2 SO 4 , the Kirkendall effect between Ni powder and Cu foil is greatly enhanced through the path of surface diffusion. As a space-holder, the K 2 SO 4 powder effectively reduces the shrinkage and densification of the Ni powders, ensuring sufficient surface diffusion channels, and promoting the formation of connected holes in the porous membrane skeleton. The results show that the uniformity of pore size distribution in the porous membranes can be precisely controlled by parameters including the sintering process, the initial composition of K 2 SO 4 , etc. Finally, a NiCu alloy porous paper membrane with a thickness of 60 µm is obtained, in which the pore size and air permeability are analyzed to be 12.93 µm and 1419.2 m3·m−2·kPa−1·h−1, respectively. In addition, the flexible NiCu alloy porous paper membrane shows good chemical stability in HF + H 2 SO 4 mixed solution. And the membrane can efficiently separate the solid particles from the suspension with Al 2 O 3 powder. This research provides a new approach and inspiration for the development of metal separation membranes applied in harsh environments. [Display omitted] • NiCu alloy porous paper membranes with high flux, controllable pore size and excellent flexibility were designed and prepared. • The pore structure of membranes can be controlled by adjusting sintering process, content and particle size of K 2 SO 4 powder. • The pore sources are extreme Kirkendall effect pores, pore occupied by K 2 SO 4 and interstitial pores. • NiCu alloy porous paper membranes have good corrosion resistance in the solution containing H 2 SO 4 and HF. • NiCu alloy porous paper membranes are highly efficient and precise in solid-liquid separation of suspension with Al 2 O 3 powder. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2024.177151