Unknown

Dataset Information

0

Osmotic Pressure and Diffusion of Ions in Charged Nanopores.


ABSTRACT: The transport of ions and water in nanopores is of interest for a number of natural and technological processes. Due to their practically identical long straight cylindrical pores, nanoporous track-etched membranes are suitable materials for investigation of its mechanisms. This communication reports on simultaneous measurements of osmotic pressure and salt diffusion with a 24 nm pore track-etched membrane. Due to the use of dilute electrolyte solutions (1-4 mM KCl and LiCl), this pore size was commensurate with the Debye screening length. Advanced interpretation of experimental results using a full version of the space-charge model has revealed that osmotic pressure and salt diffusion can be quantitatively correlated with electrostatic interactions of ions with charged nanopore walls. The surface-charge density is shown to increase with electrolyte concentration in agreement with the mechanism of deprotonation of weakly acidic surface groups. Moreover, a lack of significant surface-charge dependence on the kind of cation (K+ or Li+) demonstrates that binding of salt counterions does not play a major role in this system.

SUBMITTER: Apel P 

PROVIDER: S-EPMC8656166 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC7450701 | biostudies-literature
| S-EPMC8081195 | biostudies-literature
| S-EPMC5566185 | biostudies-literature
| S-EPMC3305756 | biostudies-literature
| S-EPMC7757204 | biostudies-literature
| S-EPMC7227020 | biostudies-literature
| S-EPMC7300306 | biostudies-literature
| S-EPMC5910861 | biostudies-other
| S-EPMC4142250 | biostudies-literature
| S-EPMC5715100 | biostudies-literature