Projects per year
Abstract
Phytantriol Q224 cubic phase, as a bicontinuous meso-structured material stable in contact with aqueous electrolyte, has found applications in drug delivery and cosmetics and is employed here as a free-standing film separating two aqueous compartments in order to study i) ion conductivity (at low potential bias within ±0.8V), ii) conductivity switching effects (at high potential bias beyond ±0.8V), and iii) phase switching effects (as a function of temperature). A microhole of approximately 20μm diameter in a 6μm thick poly-ethylene-terephthalate film is employed as the support coated with phytantriol (on a single side or on both sides) in contact with aqueous electrolyte phase on both sides in a classic four-electrode measurement cell. The conductivity of the phytantriol phase within the microhole is shown to be ionic strength, applied potential, time/history, and temperature dependent. The experimental data for asymmetric phytantriol deposits are indicative of a microhole resistance that can be switched between two states (high and low resistance associated with a filled or empty microhole, respectively). When heating symmetrically applied films of phytantriol, Q224-to-HII phase transition linked to a jump to a higher specific resistivity is observed, which is consistent with differential scanning calorimetry data for this phase transition.
Original language | English |
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Pages (from-to) | 1172-1180 |
Journal | ChemElectroChem |
Volume | 4 |
Issue number | 5 |
Early online date | 24 Feb 2017 |
DOIs | |
Publication status | Published - May 2017 |
Keywords
- Conductivity
- Impedance
- Memory
- Mesophase
- Voltammetry
Fingerprint
Dive into the research topics of 'Free-standing Phytantriol Q224 cubic-phase films: resistivity monitoring and switching'. Together they form a unique fingerprint.Projects
- 1 Finished
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Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly
Raithby, P. (PI), Burrows, A. (CoI), Lewis, D. (CoI), Marken, F. (CoI), Parker, S. (CoI), Walsh, A. (CoI) & Wilson, C. (CoI)
Engineering and Physical Sciences Research Council
1/11/12 → 30/04/18
Project: Research council
Equipment
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MC2- Surface analysis and spectroscopy
Material and Chemical Characterisation (MC2)Facility/equipment: Technology type
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