Comprehensive characterization of highly ordered MCM-41 silicas using nitrogen adsorption, thermogravimetry, X-ray diffraction and transmission electron microscopy

Mietek Jaroniec, Michal Kruk, Hyun June Shin, Ryong Ryoo, Yasuhiro Sakamoto, Osamu Terasaki

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

Highly ordered MCM-41 silicas were synthesized using a new procedure and their structures were thoroughly characterized. Using the new synthesis method and the previously reported similar one, the pore diameter of MCM-41 can be tailored from 3.1 to 4.9 nm with about 0.35 nm increments and reproducibility usually better than ±0.1 nm using surfactants of different chain length. The surfactant content and structural parameters of MCM-41 synthesized using the same single surfactant or surfactant mixture were highly similar for different silica:surfactant molar ratios in the synthesis mixture. Moreover, the silica:surfactant molar ratio in as-synthesized MCM-41 was quite independent of the chain length of the surfactant used and approximately equal to 8. This may be related to the well-defined synthesis conditions imposed by the pH adjustment procedure employed. The results indicate that the silica:surfactant ratios in starting mixtures suitable for the synthesis of high-quality MCM-41 under the present synthesis conditions should not exceed about 8 to avoid contamination with amorphous silica.

Original languageEnglish
Pages (from-to)127-134
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume48
Issue number1-3
DOIs
Publication statusPublished - 2001 Nov

Keywords

  • MCM-41 synthesis
  • Mesopore structure characterization
  • Mesoporous silica
  • Nitrogen adsorption
  • Thermogravimetry

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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