In situ observation of sintering of nickel nanoparticles during nanocasting into mesoporous silica

被引：5
作者：
Grano, Amy J. [1 ]
Sayler, Franchessa M. [1 ]
Smatt, Jan-Henrik [2 ]
Bakker, Martin G. [1 ]
机构：
[1] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA
[2] Abo Akad Univ, Ctr Excellence Funct Mat, Phys Chem Lab, SF-20500 Turku, Finland
来源：
MATERIALS LETTERS | 2013年 / 111卷
基金：
芬兰科学院;
关键词：
Electron microscopy; Sintering; Nanocasting; Nickel; Mesoporous silica; Monolith; MONOLITHS; NANOWIRES;
D O I：
10.1016/j.matlet.2013.08.080
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hierarchically porous metals are of interest in several application fields, including heterogeneous catalysis. Here, we report the nanocasting of nickel metal into hierarchically porous SBA-15 type monoliths containing ordered arrays of mesopores. Upon removal of the silica template, nickel replicas showed no evidence of an ordered mesopore structure. TEM images and XRD measurements of the nickel-silica composite show that nickel nanoparticles larger than the silica mesopores have formed. In situ heated stage TEM measurements indicate that sintering of nickel nanoparticles occurs, which leads to rapid disruption of the silica template in vacuum. This disruption appears to occur more rapidly in vacuum than under hydrogen atmosphere. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：154 / 157
页数：4
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