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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
Published on: March 27, 2019
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Modulation of microporous/mesoporous structures in self-templated cobalt-silica
Dana L Martens1, David K Wang2, Julius Motuzas2
11] The University of Queensland, FIMLab - Films and Inorganic Membrane Laboratory, School of Chemical Engineering, Brisbane, QLD 4072, Australia [2] Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC).
Scientific Reports
|January 23, 2015
Summary
This study introduces a novel, non-destructive method for controlling pore size in cobalt-silica materials. The self-templated approach modulates pore structure without post-treatment, offering precise control over porous material synthesis.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Controlling pore size distribution is crucial for designing advanced porous materials.
- Current methods often require post-treatment modification, limiting efficiency.
- Developing self-templated, non-destructive methods is highly desirable.
Purpose of the Study:
- To investigate the modulation of pore size in cobalt-silica systems using a novel, non-destructive, self-templated method.
- To understand the mechanism of pore formation and modulation in different cobalt-silica precursor systems.
- To explore the influence of precursor condensation extent on final material porosity.
Main Methods:
- Synthesis of cobalt-silica systems from two distinct cobalt-containing silica precursors (sol and xerogel) with varying condensation levels.
- Mixing precursors with pure silica sol to achieve cobalt concentrations from 5-40 mol%.
- Characterization of resultant materials to analyze pore size distribution and structural attributes.
Main Results:
- The sol-derived (SG') series exhibited typical mesoporous characteristics at high cobalt concentrations, linked to Co3O4 formation.
- The xerogel-derived (XG') series showed significantly suppressed mesoporosity.
- A mechanism was proposed where cobalt species acted as autogenous templates, with subsequent silica infiltration modifying pore structure in the XG' series.
Conclusions:
- A novel, non-destructive, self-templated method effectively modulates pore size in cobalt-silica materials.
- The extent of condensation in silica precursors significantly influences the final pore structure.
- The cobalt source can act as an autogenous template, enabling tunable pore formation and reduction.
