Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
Influence of Metal Ions on the Melting Temperature, Modulus, and Gelation Time of Gelatin Gels : Specific Ion Effects on Hydrogel Properties. / Andersen, Amanda; Ibsen, Casper Jon Steenberg; Birkedal, Henrik.
In: Journal of Physical Chemistry B, Vol. 122, No. 43, 12.10.2018, p. 10062-10067.Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
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TY - JOUR
T1 - Influence of Metal Ions on the Melting Temperature, Modulus, and Gelation Time of Gelatin Gels
T2 - Specific Ion Effects on Hydrogel Properties
AU - Andersen, Amanda
AU - Ibsen, Casper Jon Steenberg
AU - Birkedal, Henrik
PY - 2018/10/12
Y1 - 2018/10/12
N2 - The impact of ions on hydrogel strength is not well understood, in particular with regards to specific ion effects for cations. Herein, we find that divalent and monovalent cations in most cases reduce the modulus and melting temperature while increasing the gelation time of gelatin hydrogels. This behavior is in contrast to the well-known stiffening effect of trivalent metals. The melting temperature, the logarithm of the gelation time, and the logarithm of the amplitude of the complex modulus were found to follow a power law dependence on ionic strength: kIx. The power law exponent, x, was found to be universal within the groups of monovalent and divalent cations. The prefactor k depended linearly on the ionic radius, which was used as a proxy for ion polarizability. The slope of this linear dependence was different for monovalent and divalent cations.
AB - The impact of ions on hydrogel strength is not well understood, in particular with regards to specific ion effects for cations. Herein, we find that divalent and monovalent cations in most cases reduce the modulus and melting temperature while increasing the gelation time of gelatin hydrogels. This behavior is in contrast to the well-known stiffening effect of trivalent metals. The melting temperature, the logarithm of the gelation time, and the logarithm of the amplitude of the complex modulus were found to follow a power law dependence on ionic strength: kIx. The power law exponent, x, was found to be universal within the groups of monovalent and divalent cations. The prefactor k depended linearly on the ionic radius, which was used as a proxy for ion polarizability. The slope of this linear dependence was different for monovalent and divalent cations.
UR - http://www.scopus.com/inward/record.url?scp=85055680438&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.8b07658
DO - 10.1021/acs.jpcb.8b07658
M3 - Journal article
VL - 122
SP - 10062
EP - 10067
JO - Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
JF - Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
SN - 1520-6106
IS - 43
ER -