Easy and flexible preparation of nanocasted carbon monoliths exhibiting a multimodal hierarchical porosity

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: An-Hui Lu, Jan-Henrik Smått, Stefan Backlund, Mika Lindén
Förläggare: ELSEVIER SCIENCE BV
Publiceringsår: 2004
Tidskrift: Microporous and Mesoporous Materials
Tidskriftsakronym: MICROPOR MESOPOR MAT
Volym: 72
Nummer: 1-3
Artikelns första sida, sidnummer: 59
Artikelns sista sida, sidnummer: 65
Antal sidor: 7
ISSN: 1387-1811


Abstrakt

Carbon monoliths exhibiting two- or three-modal porosity, in addition to the inherent microporosity, have been prepared by nanocasting using meso-macroporous silica monoliths as the scaffold. Volume and surface templating has been successfully combined in a one-step impregnation approach, which is shown to be a straightforward means to impregnate the smaller modes of pores in the silica host. The monoliths were investigated by N-2-sorption, scanning electron microscopy, transmission electron microscopy, and mercury porosimetry, resulting in a fairly complete description of the origin of the different modes of porosity in the system. It is shown that the carbon monoliths represent a positive replica of the starting silica monoliths on the micrometer length scale, while the volume templated mesopores are a negative replica of the silica scaffold. The different modes of porosity are arranged in a hierarchical structure-within-structure fashion, which is thought to be optimal for applications requiring a high surface area in combination with a low pressure drop over the material. (C) 2004 Elsevier Inc. All rights reserved.


Nyckelord

hierarchical, Monolith, Nanocasting, replica

Senast uppdaterad 2019-20-10 vid 04:03