Effect of size-asymmetric electrolyte on single-file osmosis

A. V. Raghunathan, N. R. Aluru

Research output: Contribution to journalArticlepeer-review


Single-file osmosis through a 0.9 nm diameter semipermeable carbon membrane using various size-asymmetric electrolyte solutions is investigated using molecular dynamics simulations. In an uncharged pore, the osmotic flux with a KCl solution is found to be higher than that of in a NaCl solution, i.e., J KCl>J NaCl, for same concentration gradient of solute. Mean force and hydration analysis indicate that distinct ion-water and ion-pore molecular interactions cause a differential cation and anion affinity to the pore, leading to the observed size-asymmetric electrolyte dependence on osmotic flux. The water orientation in the pore during osmosis is also related to the ion affinity and exhibits a size-asymmetric electrolyte dependence.

Original languageEnglish (US)
Article number064107
JournalApplied Physics Letters
Issue number6
StatePublished - 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Effect of size-asymmetric electrolyte on single-file osmosis'. Together they form a unique fingerprint.

Cite this