Abstract
(Invited) Voltammetry in Polyvinyl Gel Electrolyte with Iron Oxide Nanoparticles: Suppression of Hydrodynamics
Meeting abstracts (Electrochemical Society), Vol.MA2025-01(57), pp.2768-2768
07/11/2025
DOI: 10.1149/MA2025-01572768mtgabs
Abstract
In hydrodynamic transport, bulk fluid flows at a rate characterized by the viscosity of the fluid. In a polymer gel, electrostatics form a matrix where macroscopic viscosity is high, but solvent is captured in nanoscale volumes between the polymer chains. Bulk fluid flow is suppressed, but redox probes can diffuse through the gel at rates only slightly lower than in bulk solution. In a well formed gel, redox probes move by diffusion with little to no bulk solvent flow.
Here, polyvinyl alcohol is acidified and hydrated. Acidification generates electrostatic interactions between the chains to form a gel. Flory-Huggins theory predicts the damping of convection, while microviscosity allows probe and electrolyte diffusion. Measurements at longer time with decreased convection are allowed. Iron phenanthroline dissolved in the gel serves as the redox probe. Glass coated iron oxide nanoparticles are also dispersed in the gel. The nanoparticles may or may not be magnetized. In bulk fluids, magnetic fields and gradient induce the fluid flow of magnetohydrodynamics (MHD). In the polyvinyl alcohol gel, no MHD is observed, but magnetic gradients about the magnetized nanoparticles impact electron transfer rates and faradaic current. Polyvinyl alcohol gel containing nanomagnets provides a means to establish magnetic gradients at electrodes, an alternative to micromagnets in Nafion films. Studies in the gel material allow for experimentation of matrices devoid of hydrodynamic convections.
Details
- Title: Subtitle
- (Invited) Voltammetry in Polyvinyl Gel Electrolyte with Iron Oxide Nanoparticles: Suppression of Hydrodynamics
- Creators
- Andy Peter Lazicki - University of IowaScott Reynertson - University of IowaJohna Leddy - University of Iowa
- Resource Type
- Abstract
- Publication Details
- Meeting abstracts (Electrochemical Society), Vol.MA2025-01(57), pp.2768-2768
- DOI
- 10.1149/MA2025-01572768mtgabs
- ISSN
- 2151-2043
- eISSN
- 2151-2035
- Publisher
- The Electrochemical Society, Inc
- Number of pages
- 1
- Language
- English
- Date published
- 07/11/2025
- Academic Unit
- Chemistry
- Record Identifier
- 9984865438802771
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