Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 488, Issue -, Pages 322-334Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.10.069
Keywords
Silicification; Lysozyme; Polyetlioxysiloxane; High specific surface area; Surfactant; Nanoparticles; Hybrid materials
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Funding
- Alexander von Humboldt-Stiftung, Germany
- EU
- federal state of North Rhine-Westphalia [EFRE 30 00 883 02]
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The influence of different parameters on the silicification procedure using lysozyme is reported. When polyethoxysiloxane (PEOS), an internally crosslinked silica reservoir, is used, regular structures with a narrow size distribution could be obtained only via introducing the silica precursor in two steps including initial dropping and subsequent addition of residual oil phase in one portion. We found that mixing sequence of mineralizing agents in the presence of a positively charged surfactant plays a key role in terms of silica precipitation when tetraethoxyorthosilicate (TEOS) is the oil phase. In contrast, well mineralized crumpled features with high specific surface area could be synthesized in the presence of PEOS as a silica precursor polymer, regardless of mixing sequence. Moreover, introducing sodium dodecyl sulfate (SDS) as a negatively charged surfactant resulted in regular silica sphere formation only in combination with hexylene glycol (MPD) as a specific co-solvent. Finally, it is demonstrated that by inclusion of different nanoparticles even more sophisticated hybrid materials can be generated. (C) 2016 Elsevier Inc. All rights reserved.
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