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Optimization of Polyelectrolyte Multilayer Capsules

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2010-08-23

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Philipps-Universität Marburg
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Abstract

Polyelectrolyte multilayer capsules based on CaCO3 and SiO2 cores coated with the polyelectrolyte systems PAH/PSS and PDADMAC/PSS have been analyzed. A series of measurement has been conducted to study the impact of temperature, rotation speed during precipitation and concentration of the stock solutions on the CaCO3 core diameter. Also the effect of annealing on the empty capsules has been observed. As a result an impact of the heating on the diameter was observed, but in a few cases swelling was detected although shrinking was expected. Furthermore a strong dependency of the CaCO3 particle size on the rotation speed during the particle precipitation has been observed. The CaCO3 microspheres increased in size if the rotation speed was decreased from 1200 rpm to 250 rpm while in general keeping their monodisperse character. This could be used to obtain monodisperse particles with tunable size that can be employed in a wide field of applications like biotechnology, medicine or catalysis.

Keywords

Polyelectrolyte Multylayer capsule, Layer-by-Layer, CaCO3, Heat shrinking, Polyelectrolytes ... ... Protein properties, folding, see 87.15.Cc and 87.14.Ee in biological and medical physics ... ... Enzymes, see 82.39.Fk and 87.14.Ee ... ... DNA/RNA, see 82.39.Pj and 87.14.Gg, Thermisches Verhalten, Polyelektrolyt Kapseln, CaCO3

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https://open.uni-marburg.de/handle/10.17192/ed.2010.0012

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