Porous Structure of Silica Colloidal Crystals
Document Type
Article
Publication Date
2-12-2019
Abstract
We prepared silica colloidal crystals with different pore sizes using isothermal heating evaporation-induced self-assembly in quantities suitable for nitrogen porosimetry and studied their porous structure. We observed pores of two types in agreement with the description of silica colloidal crystals as face-centered cubic packed structures containing octahedral and tetrahedral voids. We calculated the sizes of these pores using the Derjaguin−Broekhoff−de Boer theory of capillary condensation for spherical pores. We also described the pore geometry mathematically and showed that the octahedral pore radii measured experimentally matches closely the radii of the spheres of the same volume. In the case of the tetrahedral pores, the proposed approach underestimated the pore radius by ca. 40%. Overall, this simple geometrical description provides a good representation of the porous system in silica colloidal crystals.
Identifier
85061260119 (Scopus)
Publication Title
Langmuir
External Full Text Location
https://doi.org/10.1021/acs.langmuir.8b03476
e-ISSN
15205827
ISSN
07437463
PubMed ID
30636422
First Page
2230
Last Page
2235
Issue
6
Volume
35
Grant
18-13-00149
Fund Ref
Russian Science Foundation
Recommended Citation
Galukhin, Andrey; Bolmatenkov, Dmitrii; Emelianova, Alina; Zharov, Ilya; and Gor, Gennady Y., "Porous Structure of Silica Colloidal Crystals" (2019). Faculty Publications. 7789.
https://digitalcommons.njit.edu/fac_pubs/7789