超声辐照下脱合金过程中纳米多孔银的形成机制。

Formation mechanism of nanoporous silver during dealloying with ultrasonic irradiation.

作者信息

Zhang Runwei, Wang Xu, Huang Jacob C, Li Fei, Zhang Zhichao, Wu Ming

机构信息

School of Mechanical Engineering, Liaoning Shihua University Fushun11300 P. R. China.

Institute for Advanced Study, Department of Materials Science & Engineering, City University of Hong Kong Kowloon Hong Kong

出版信息

RSC Adv. 2019 Mar 29;9(18):9937-9945. doi: 10.1039/c9ra01742a. eCollection 2019 Mar 28.

DOI:10.1039/c9ra01742a

PMID:35520898

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9062308/

Abstract

Nanoporous silver (NPS) with an extreme coarsened 3-dimensional bi-continuous ligament and nanopore structure could be prepared by chemical dealloying with high-intensity ultrasonic irradiation (UI). The formation mechanism of NPS dealloying with UI was different from NPS obtained through free corrosion. It evolved into NPS with a new lump forming-disintegrating mechanism. Ultrasonic irradiation had strong effects on the dealloying process of NPS. The stirring effect produced by ultrasonic vibration could promote the corrosion of Cu and facilitate the diffusion of Ag atoms. Therefore, the coarsening rate of the ligament was increased significantly. Dealloying assisted by UI could generate an extremely coarsened microstructure of which ligament and pore sizes were much larger than those obtained from free corrosion dealloying.

摘要

通过高强度超声辐照（UI）化学脱合金化可制备出具有极度粗化的三维双连续韧带和纳米孔结构的纳米多孔银（NPS）。超声辐照下NPS脱合金化的形成机制与通过自由腐蚀获得的NPS不同。它通过一种新的团块形成-分解机制演变成NPS。超声辐照对NPS的脱合金化过程有强烈影响。超声振动产生的搅拌作用可促进Cu的腐蚀并促进Ag原子的扩散。因此，韧带的粗化速率显著提高。超声辐照辅助脱合金化可产生一种极度粗化的微观结构，其韧带和孔径比自由腐蚀脱合金化获得的结构大得多。