Evidence for phase transitions of aqueous gelatin gels in a centrifugal field
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Experimental findings of turbid zones in the schlieren patterns of gels in a centrifugal field are explained by a demixing of gels into a highly swollen gel coexisting with a collapsed gel. The thermodynamic analysis of a slightly cross-linked aqueous gel at relatively low centrifugal field, which remains clear, leads to the conclusion that the system is close to its stability limit. A procedure is proposed to show how the stability limits may be extrapo lated by means of ultracentrifugal measurements. The phenomena are separated into a transient and a permanent demixing. The permanent demixing has been qualitatively explained by use of state diagrams predicted recently by Khokhlov and coworkers, Ilavsky and also by Moerkerke et al.
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BORCHARD, W., Helmut CÖLFEN, D. KISTERS, A. STRAATMANN, 2002. Evidence for phase transitions of aqueous gelatin gels in a centrifugal field. Symposium on Analytical Ultracentrifugation. Duisburg, 1. März 2001 - 2. März 2001. In: BORCHARD, W., ed., A. STRAATMANN, ed.. Analytical Ultracentrifugation VI. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002, pp. 101-112. Progress in Colloid and Polymer Science. 119. ISBN 978-3-540-42489-5. Available under: doi: 10.1007/3-540-44672-9_15BibTex
@inproceedings{Borchard2002Evide-40690, year={2002}, doi={10.1007/3-540-44672-9_15}, title={Evidence for phase transitions of aqueous gelatin gels in a centrifugal field}, number={119}, isbn={978-3-540-42489-5}, publisher={Springer Berlin Heidelberg}, address={Berlin, Heidelberg}, series={Progress in Colloid and Polymer Science}, booktitle={Analytical Ultracentrifugation VI}, pages={101--112}, editor={Borchard, W. and Straatmann, A.}, author={Borchard, W. and Cölfen, Helmut and Kisters, D. and Straatmann, A.} }
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