Alternative etching methods to expand nanocasting, and use in the synthesis of hierarchically porous nickel oxide, zinc oxide, and copper monoliths

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Amy J. Grano, Franchessa D. Sayler, Jan-Henrik Smått, Martin G. Bakker
Förläggare: Cambridge University Press
Publiceringsår: 2013
Tidskrift: Journal of Materials Research
Tidskriftsakronym: J. Mater. Res.
Volym: 28
Nummer: 17
Artikelns första sida, sidnummer: 2483
Artikelns sista sida, sidnummer: 2489
Antal sidor: 7
ISSN: 0884-2914
eISSN: 2044-5326


Abstrakt

Nanocasting into silica templates for preparation of mesoporous materials has up to now been limited to those metal oxides and metals that can withstand the harsh silica etching processes currently used. Two new methods of removing the silica template are reported, either by dissolving the silica in methanolic base or by dissolution in aqueous base under an external potential. The utility of these methods is demonstrated in the synthesis of hierarchically porous zinc oxide, nickel oxide, and copper monoliths that would dissolve or react using other template removal methods. The successful etching of monolithic zinc oxide using methanolic base etching can be explained by the reduced solubility of zinc oxide in methanol compared with an aqueous base, while it also reduces the formation of hydroxides when etching the nickel oxide and copper monoliths. Alternatively, the formation of highly soluble copper oxide/hydroxide can be avoided by holding the copper monolith at a sufficiently negative potential while etching with an aqueous base.

Senast uppdaterad 2020-26-02 vid 06:14