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- W2060757310 abstract "A continuum electrostatic calculation explores dielectric heterogeneity in membranes and its influence on ion sorption. The spherical shell model of Ullman is used. A transition in predicted sorption behaviour occurs as b, the mean ionic radius, becomes comparable with L, the size of dielectric domains. Since the finite size of molecules establishes a lower limit of L ˜ b, it is likely that no membrane is a strictly homogeneous dielectric from the standpoint of ion sorption. The calculation predicts that changing the dielectric domain size between 5 · 10−8 and 20 · 10−8 cm has a drastic effect on ion sorption. Objections which can arise from the very special nature of Ullman's model are discussed. Mit Hilfe der elektrostatischen Kontinuumstheorie werden die dielektrische Heterogenität von Membranen und ihr Einfluß auf die Absorption von Ionen durch die Membran untersucht, und zwar unter Verwendung des Kugelschalen-Modells von Ullman. Der theoretisch ermittelte Verteilungskoeffizient eines Ions als Funktion der Abmessung der dielektrisch homogenen Bereiche weist starke Änderungen auf, sobald der mittlere Ionenradius b vergleichbar mit der charakteristischen Abmessung L der homogenen Bereiche wird. Da die endliche Größe von Molekeln eine untere Grenze für L(L˜b) festlegt, ist es prinzipiell denkbar, daß vom Standpunkt der Absorption keine Membran wirklich homogen ist. Die theoretischen Untersuchungen ergeben, daß sich eine Änderung der charakteristischen Abmessung L von 5 · 10−8 cm auf 20 · 10−8 cm drastisch auf die Absorption von Ionen auswirkt. Die sich aus der sehr speziellen Natur des Modells ergebenden Ansätze zur Kritik werden diskutiert." @default.
- W2060757310 created "2016-06-24" @default.
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- W2060757310 date "1976-09-01" @default.
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- W2060757310 title "The Membrane/Water Partition Coefficients of Ions: Electrostatic Calculations of Dielectric Heterogeneity" @default.
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- W2060757310 doi "https://doi.org/10.1002/bbpc.19760800905" @default.
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