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.
LanguageEnglish
Pages1172-1180
JournalChemElectroChem
Volume4
Issue number5
Early online date24 Feb 2017
DOIs
StatusPublished - May 2017

Fingerprint

Monitoring
Phase transitions
Electrolytes
Cosmetics
Ionic strength
Drug delivery
Polyethylene terephthalates
Differential scanning calorimetry
Deposits
Polyethylene Terephthalates
Heating
Temperature
Electrodes
Ions
3,7,11,15-tetramethyl-1,2,3-hexadecanetriol

Keywords

  • Conductivity
  • Impedance
  • Memory
  • Mesophase
  • Voltammetry

Cite this

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title = "Free-standing Phytantriol Q224 cubic-phase films: resistivity monitoring and switching",
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.",
keywords = "Conductivity, Impedance, Memory, Mesophase, Voltammetry",
author = "Rosemary Brown and Elena Madrid and Remi Castaing and Stone, {James M.} and Squires, {Adam M.} and Edler, {Karen J.} and Kei Takashina and Frank Marken",
year = "2017",
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publisher = "John Wiley and Sons Inc.",
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AU - Brown, Rosemary

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AU - Stone, James M.

AU - Squires, Adam M.

AU - Edler, Karen J.

AU - Takashina, Kei

AU - Marken, Frank

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