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Controlling polymerization initiator concentration in mesoporous silica thin films
Fabio Krohm1, Haiko Didzoleit, Marcus Schulze
1Ernst-Berl Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt , Alarich-Weiss-Str. 4, D-64287 Darmstadt, Germany.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 25, 2013
Summary
Researchers controlled polymer density in mesoporous membranes by adjusting polymerization initiator levels. This method enhances control over ionic transport through silica membranes, impacting their permselectivity properties.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Chemistry
Background:
- Mesoporous membranes are crucial for separation technologies.
- Controlling polymer density within pores is key to tuning membrane performance.
- Existing methods lack precise control over polymer grafting.
Purpose of the Study:
- To develop a strategy for controlled polymer density in mesoporous silica films.
- To investigate the impact of polymerization initiator concentration on membrane properties.
- To establish a link between polymer functionalization and ionic permselectivity.
Main Methods:
- Sol-gel co-condensation approach to incorporate polymerization initiators (BPSilane or APTES) into silica walls.
- Systematic variation of initiator concentration in precursor solutions.
- Characterization using FTIR, XPS, XRR, ellipsometry, AFM, and TEM to analyze surface chemistry, porosity, and structure.
Main Results:
- Mesoporous structure was maintained up to 25 mol % APTES and 15 mol % BPSilane.
- Gradual modification of reactive polymerization initiator amounts was achieved.
- Films exhibited accessible, charge-dependent ionic permselectivity.
- Increased precursor ratio led to a higher degree of functionalization.
Conclusions:
- The developed sol-gel strategy enables precise control over polymer grafting density in mesoporous films.
- This control directly influences ionic transport properties, offering tunable ionic permselectivity.
- The findings are significant for advanced membrane applications requiring tailored ionic transport.
