Mechanisms of reduced solute diffusivity at nanoconfined solid-liquid interface

T. Mahadevan, M. Kojic, M. Ferrari, A. Ziemys

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

We report results from molecular simulations that reveal the causes of reduced diffusivity at solid-liquid interfaces in the presence of nanoscale confinement. The diffusion of a 2 M glucose solution was simulated inside a 10 nm silica channel together with the calculated thermodynamic properties of diffusion. A strong energy-entropy compensation mechanism was found at the interface with a free energy minimum of -0.6 kcal/mol. Using the Eyring equation the average jump length was reduced by 15% at interface. The complete loss of solute diffusivity at silica surface was explained by the substantial loss of the probability of productive displacements. The results suggested that glucose molecule diffusivity close to the surface might be related to a stiffer cage of the hydration shell, which affects the probability of cage breaking. These results help in understanding of diffusion mechanisms at interface and predicting mass transport in nanoconfinement for engineering and biomedical applications.

Original languageEnglish (US)
Pages (from-to)15-21
Number of pages7
JournalChemical Physics
Volume421
DOIs
StatePublished - 2013

Keywords

  • Adsorption
  • Diffusion
  • Eyring equation
  • Interface
  • Thermodynamics

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

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