| Issue |
Europhys. Lett.
Volume 37, Number 4, February I 1997
|
|
|---|---|---|
| Page(s) | 275 - 280 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00143-x | |
| Published online | 01 September 2002 | |
Complexation and precipitation in polyampholyte solutions
Institut Charles Sadron (CNRS UPR022), 6 rue Boussingault, F-67083 Strasbourg Cedex, France
Received:
9
October
1996
Accepted:
23
December
1996
We discuss multichain effects in polyampholyte solutions of finite concentration and find that the existing single-chain theories are limited to exponentially small concentrations, if the sample contains chains with net charges of both signs. We show that charged polyampholytes have a strong tendency to form neutral complexes and to precipitate. Stretched chains almost play no role in the ideal case of a neutral sample with nearly symmetric charge distribution. However, for a non-neutral sample, the free counterions accumulate in the supernatant together with charged, elongated chains and the behavior of the solution is dominated by “impurities”.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 64.75.+g – Solubility, segregation, and mixing; phase separation / 87.15.Da – Physical chemistry of solutions of biomolecules; condensed states
© EDP Sciences, 1997
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