Abstract
The role of counter ions and ion dissociation in establishing the equilibrium swelling of balanced and unbalanced polyampholytic hydrogels has been investigated experimentally and theoretically. The swelling dependence on both the net charge offset and the external bath salt concentration has been examined using an acrylamide based polyampholytic hydrogels. By careful consideration of the swelling kinetics, we illustrate the effects of ion dissociation equilibria and counter ion shielding in polyampholytic hydrogels near their balance point where both polyelectrolyte and polyampholyte effects are present. The theory considers a Flory type swelling model where the Coulombic interactions between fixed ions in the hydrogel resemble those of an ionic solid with a Debye screening factor. Theoretical predictions from this model are in qualitative agreement with our experimental results.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 8713-8720 |
| Number of pages | 8 |
| Journal | Journal of Chemical Physics |
| Volume | 104 |
| Issue number | 21 |
| State | Published - Jun 1 1996 |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Equilibrium swelling properties of polyampholytic hydrogels. / English, Anthony E.; Mafé, Salvador; Manzanares, José A.; Yu, Xiahong; Grosberg, Alexander Yu; Tanaka, Toyoichi.
In: Journal of Chemical Physics, Vol. 104, No. 21, 01.06.1996, p. 8713-8720.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Equilibrium swelling properties of polyampholytic hydrogels
AU - English, Anthony E.
AU - Mafé, Salvador
AU - Manzanares, José A.
AU - Yu, Xiahong
AU - Grosberg, Alexander Yu
AU - Tanaka, Toyoichi
PY - 1996/6/1
Y1 - 1996/6/1
N2 - The role of counter ions and ion dissociation in establishing the equilibrium swelling of balanced and unbalanced polyampholytic hydrogels has been investigated experimentally and theoretically. The swelling dependence on both the net charge offset and the external bath salt concentration has been examined using an acrylamide based polyampholytic hydrogels. By careful consideration of the swelling kinetics, we illustrate the effects of ion dissociation equilibria and counter ion shielding in polyampholytic hydrogels near their balance point where both polyelectrolyte and polyampholyte effects are present. The theory considers a Flory type swelling model where the Coulombic interactions between fixed ions in the hydrogel resemble those of an ionic solid with a Debye screening factor. Theoretical predictions from this model are in qualitative agreement with our experimental results.
AB - The role of counter ions and ion dissociation in establishing the equilibrium swelling of balanced and unbalanced polyampholytic hydrogels has been investigated experimentally and theoretically. The swelling dependence on both the net charge offset and the external bath salt concentration has been examined using an acrylamide based polyampholytic hydrogels. By careful consideration of the swelling kinetics, we illustrate the effects of ion dissociation equilibria and counter ion shielding in polyampholytic hydrogels near their balance point where both polyelectrolyte and polyampholyte effects are present. The theory considers a Flory type swelling model where the Coulombic interactions between fixed ions in the hydrogel resemble those of an ionic solid with a Debye screening factor. Theoretical predictions from this model are in qualitative agreement with our experimental results.
UR - http://www.scopus.com/inward/record.url?scp=0001439127&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001439127&partnerID=8YFLogxK
M3 - Article
VL - 104
SP - 8713
EP - 8720
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 21
ER -