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Synthesis of Cristobalite Containing Ordered Interstitial Mesopores using Crystallization of Silica Colloidal Crystals
Author(s) -
Matsuno Takamichi,
Nakaya Takamichi,
Kuroda Yoshiyuki,
Wada Hiroaki,
Shimojima Atsushi,
Kuroda Kazuyuki
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202001262
Subject(s) - cristobalite , materials science , crystallization , colloidal crystal , chemical engineering , colloidal silica , mesoporous material , nanocomposite , amorphous solid , colloid , aqueous solution , mesoporous silica , nanotechnology , composite material , organic chemistry , chemistry , catalysis , quartz , engineering , coating
Cristobalite with ordered interstitial dual‐sized mesopores was synthesized through the crystallization of silica colloidal crystals composed of monodispersed amorphous silica nanoparticles. An aqueous solution containing both a flux (Na 2 O) and a carbon precursor (an aqueous low‐molecular weight phenolic resin) was infiltrated into the interstices of silica colloidal crystals. The organic fraction in the nanocomposite was further polymerized and subsequently carbonized in an Ar flow at 750 °C to reinforce the colloidal crystal structure. The thermal treatment resulted in the crystallization of the colloidal crystals into cristobalite while retaining the porous structure. The cristobalite‐carbon nanocomposite was calcined in air to remove the carbon and create interstitial ordered mesopores in the cristobalite. The surfaces of crystalline mesoporous silica are quite different from those of various ordered mesoporous silica with amorphous frameworks; thus, the present findings will be useful for a precise understanding and control of the interfaces between the mesopores and silica networks.