Issue 4, 2004
From the journal:

Physical Chemistry Chemical Physics

Biomimetic synthesis of silica nanospheres depends on the aggregation and phase separation of polyamines in aqueous solution

Eike Brunner,*a   Katharina Lutza  and  Manfred Sumperb  

* Corresponding authors

a Institut für Biophysik und Physikalische Biochemie, Universität Regensburg, D-93040 Regensburg, Germany
E-mail: eike.brunner@biologie.uni-regensburg.de
Fax: +49 941 943 2479
Tel: +49 941 943 2492

b Lehrstuhl für Biochemie I, Universität Regensburg, D-93040 Regensburg, Germany

Abstract

Long-chain polyamines extracted from the highly siliceous cell walls of diatoms are known to precipitate silica nanospheres from aqueous, silicic-acid containing solutions at near-neutral pH in vitro. The same is true for synthetic polyamines such as polyallylamine. In the present contribution we show that the microscopic phase separation of polyallylamine in aqueous solution is strictly correlated with the silica precipitation activity of polyallylamine/silicic acid solutions. Multivalent anions such as phosphate or sulfate efficiently induce this microscopic phase separation. At higher anion concentrations, macroscopic phase separation occurs. In contrast to the multivalent phosphate and sulfate ions, the monovalent chloride ions are much less efficient in polyallylamine aggregate formation.

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Article information

DOI
https://doi.org/10.1039/B313261G
Article type
Paper
Submitted
21 Oct 2003
Accepted
17 Dec 2003
First published
20 Jan 2004

Phys. Chem. Chem. Phys., 2004,6, 854-857

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Biomimetic synthesis of silica nanospheres depends on the aggregation and phase separation of polyamines in aqueous solution

E. Brunner, K. Lutz and M. Sumper, Phys. Chem. Chem. Phys., 2004, 6, 854 DOI: 10.1039/B313261G

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