Journal article
Synthesis and Tuning of Bimodal Mesoporous Silica by Combined Hydrocarbon/Fluorocarbon Surfactant Templating
Langmuir, Vol.25(11), pp.6486-6492
06/02/2009
DOI: 10.1021/la9000939
PMID: 19323503
Abstract
Hydrocarbon and fluorocarbon surfactants show highly nonideal mixing that under some conditions results in demixing of the two types of surfactants into distinct populations of fluorocarbon-rich and hydrocarbon-rich aggregates. This also occurs in materials prepared by cooperative assembly of hydrolyzed tetraethoxysilane with mixtures of cetyltrimethylammonium chloride (CTAC) and 1,1,2,2-tetrahydro-perfluorodecylpyridinium chloride (HFDePC). Here, we report conditions under which demixed micelles lead to bimodal mesoporous materials (including specific concentrations of ammonia and salt in the synthesis solution) and show that the sizes of the hydrocarbon-templated and fluorocarbon-templated pores can be finely and independently controlled by adding lipophilic or fluorophilic oils, respectively. Nitrogen sorption isotherms and transmission electron microscopy provide clear evidence for a single phase of demixed but disordered wormhole-like pores.
Details
- Title: Subtitle
- Synthesis and Tuning of Bimodal Mesoporous Silica by Combined Hydrocarbon/Fluorocarbon Surfactant Templating
- Creators
- Rong XingHans-Joachim LehmlerBarbara L KnutsonStephen E Rankin
- Resource Type
- Journal article
- Publication Details
- Langmuir, Vol.25(11), pp.6486-6492
- DOI
- 10.1021/la9000939
- PMID
- 19323503
- NLM abbreviation
- Langmuir
- ISSN
- 0743-7463
- eISSN
- 1520-5827
- Publisher
- American Chemical Society
- Language
- English
- Date published
- 06/02/2009
- Academic Unit
- Occupational and Environmental Health; Iowa Neuroscience Institute
- Record Identifier
- 9984000918702771
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