Determination of the bulk modulus of microgel particles

In this paper, we present an in-depth study of a non-invasive method to determine the bulk modulus of microgel particles. The method relies on measuring the particle size as a function of external osmotic pressure using dynamic light scattering to measure the particle size and dextran solutions to c...

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Bibliographic Details
Published in:Colloid and polymer science 2011-04, Vol.289 (5-6), p.721-728
Main Authors: Sierra-Martin, Benjamin, Frederick, Justin A., Laporte, Yesenia, Markou, George, Lietor-Santos, Juan Jose, Fernandez-Nieves, Alberto
Format: Article
Language:English
Subjects:
Bulk modulus
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Crosslinking
Dextrans
Dynamic response
Dynamics
Food Science
Microgels
Nanotechnology and Microengineering
Original Contribution
Osmotic pressure
Physical Chemistry
Polymer Sciences
Scattering
Soft and Granular Matter
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Description
Summary:In this paper, we present an in-depth study of a non-invasive method to determine the bulk modulus of microgel particles. The method relies on measuring the particle size as a function of external osmotic pressure using dynamic light scattering to measure the particle size and dextran solutions to change the osmotic pressure. An independent characterization of the dynamic response of the dextran solutions is required in order to obtain the microgel size in the microgel/dextran mixtures. The method works fine in most cases except for slightly crosslinked microgels, where the scattering from the particles is comparable to the scattering from the dextrans.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-010-2346-z