Free-Standing Phytantriol Q224 Cubic-Phase Films : Resistivity Monitoring and Switching
Brown, Rosemary ; Madrid, Elena ; Castaing, Remi ; Stone, James M. ; Squires, Adam M. ; Edler, Karen J. LU
; Takashina, Kei
and Marken, Frank
(2017)
In ChemElectroChem
4(5).
p.1172-1180
- 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 ±0.8 V), ii) conductivity switching effects (at high potential bias beyond ±0.8 V), and iii) phase switching effects (as a function of temperature). A microhole of approximately 20 μm diameter in a 6 μm 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... (More)
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 ±0.8 V), ii) conductivity switching effects (at high potential bias beyond ±0.8 V), and iii) phase switching effects (as a function of temperature). A microhole of approximately 20 μm diameter in a 6 μm 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.
(Less)
- author
- Brown, Rosemary
; Madrid, Elena
; Castaing, Remi
; Stone, James M.
; Squires, Adam M.
; Edler, Karen J.
LU
; Takashina, Kei
and Marken, Frank
- publishing date
- 2017-05-01
- type
- Contribution to journal
- publication status
- published
- keywords
- conductivity, impedance, memory, mesophase, voltammetry
- in
- ChemElectroChem
- volume
- 4
- issue
- 5
- pages
- 9 pages
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:85013632832
- ISSN
- 2196-0216
- DOI
- 10.1002/celc.201600735
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
- id
- de2606bb-062c-4042-b3ea-0676719f8e5b
- date added to LUP
- 2023-01-18 09:15:56
- date last changed
- 2025-10-14 13:29:41
@article{de2606bb-062c-4042-b3ea-0676719f8e5b,
abstract = {{<p>Phytantriol Q<sup>224</sup> 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 ±0.8 V), ii) conductivity switching effects (at high potential bias beyond ±0.8 V), and iii) phase switching effects (as a function of temperature). A microhole of approximately 20 μm diameter in a 6 μm 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, Q<sup>224</sup>-to-H<sub>II</sub> 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.</p>}},
author = {{Brown, Rosemary and Madrid, Elena and Castaing, Remi and Stone, James M. and Squires, Adam M. and Edler, Karen J. and Takashina, Kei and Marken, Frank}},
issn = {{2196-0216}},
keywords = {{conductivity; impedance; memory; mesophase; voltammetry}},
language = {{eng}},
month = {{05}},
number = {{5}},
pages = {{1172--1180}},
publisher = {{John Wiley & Sons Inc.}},
series = {{ChemElectroChem}},
title = {{Free-Standing Phytantriol Q<sup>224</sup> Cubic-Phase Films : Resistivity Monitoring and Switching}},
url = {{http://dx.doi.org/10.1002/celc.201600735}},
doi = {{10.1002/celc.201600735}},
volume = {{4}},
year = {{2017}},
}