GB2448676A - Electrochromic colour effects from polymer membranes having conductive coatings - Google Patents
Electrochromic colour effects from polymer membranes having conductive coatings Download PDFInfo
- Publication number
- GB2448676A GB2448676A GB0700233A GB0700233A GB2448676A GB 2448676 A GB2448676 A GB 2448676A GB 0700233 A GB0700233 A GB 0700233A GB 0700233 A GB0700233 A GB 0700233A GB 2448676 A GB2448676 A GB 2448676A
- Authority
- GB
- United Kingdom
- Prior art keywords
- colour change
- polarisation
- potential
- electrochromic
- gold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000000694 effects Effects 0.000 title claims description 4
- 238000000576 coating method Methods 0.000 title 1
- 229920005597 polymer membrane Polymers 0.000 title 1
- 239000012528 membrane Substances 0.000 claims abstract description 8
- 239000010931 gold Substances 0.000 claims abstract description 7
- 229910052709 silver Inorganic materials 0.000 claims abstract description 7
- 239000004332 silver Substances 0.000 claims abstract description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052737 gold Inorganic materials 0.000 claims abstract description 6
- 239000000010 aprotic solvent Substances 0.000 claims abstract description 4
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- UXGNZZKBCMGWAZ-UHFFFAOYSA-N dimethylformamide dmf Chemical compound CN(C)C=O.CN(C)C=O UXGNZZKBCMGWAZ-UHFFFAOYSA-N 0.000 claims 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 claims 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims 1
- 229920006254 polymer film Polymers 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 238000012505 colouration Methods 0.000 abstract description 2
- 239000005486 organic electrolyte Substances 0.000 abstract description 2
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 abstract 6
- 229920006267 polyester film Polymers 0.000 abstract 1
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 abstract 1
- 238000013459 approach Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1503—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
A polymeric membrane, such as a polyester film, is coated with a conductive metal film such as gold or silver. It is immersed in an aprotic solvent, such as dimethylformamide (DMF), and preferably also an organic electrolyte such as tetra-n-butylammonium. The immersed, metal coated polymeric membrane then undergoes an electrochromic colour change when electrically polarised. For example, gold and silver coated polymeric membranes undergo a colourless to vivid red colouration when the polarising potential is cycled between 0 and -4V. The colour change may be reversed upon reversal of the polarisation potential. The colour change, or reversal of such a colour change, may be effected by the application of a state state or a cyclic potential waveform.
Description
Electrochromjc Colour Effects
TECHNICAL FIELD
This invention relates to a newly discovered electronic or electrochemically induced colour change at a modified electrode surface. We have shown that suitable polymer modified electrodes may -when immersed within certain non-aqueous aprotic solvents, be induced to alter their absorbance properties in the UV / visible region of the electromagnetic spectrum, thereby giving rise to a colour change as perceived by the human eye.
This electrochsomic colour change may find application for signage, labelling, and information based technologies, or alternatively for enhancing the atheistic appearance of products for leisure and other applications.
A number of technologies are used for signage applications ranging from Light Emitting Diode (LED) approaches through to Plasma Technologies and Liquid Crystal Display (LCD) approaches; to date electrochromic approaches have failed to find commercial application due to a number of technical problems even though electrochromic approaches offer advantages in terms of lowered power consumption and ease of viewing angle when used within displays. This technology addresses some of the technical drawbacks associated with other electrochromic technologies.
TECHNiCAL FEATURES: In the present embodiment a thin (eg 5Onm thickness) polymer sheet or membrane of, for example, polyester, may be sputtered coated with a metal such as gold or silver to render one surface electrically as depicted within Fig 1.
Fig 1: Thm-pojymer Electrical
-
Au or other metal coated to render surface electrically Microporous membrane to act as mechanical Gold and Silver coated microporous polyester membranes may be induced to undergo a vivid change in colour when the working electrode potential is cathodically polarised (either potentiostatically or via cyclic voltammetric approaches) beyond a certain threshold potential (eg -2.5V vs Ag reference) in an aprotic solvent such as dimethylfornamjde (DMF). This solvent may contain an organic electrolyte such as 0. IM tetra-n-butylammonjum perchiorate to facilitate electrical conduction across the electrolyte solution.
Electrochromjc effects of the type described here might lend themselves for exploitation within electronic displays and/or devices.
Gold and silver coated membranes of the type described within this embodiment undergo a colourless to vivid red colouration as received by the human eye when the polansing potential is cycled between 0 and -4V (vs a counter silver electrode).
The original membrane colour may be restored (known as electrochromjc bleaching') when the potential is reversed.
Claims (3)
1. That a polymer film (e.g. of polyester), membrane or other polymeric body when coated with a conductive film of layer (e.g. of gold or silver) -and when immersed within an aprotic solvent (such as dimethylformamide -DMF) and in the presence of a salt (such as tetra-n-butylammonjum perchlorate) may undergo an electrochromic colour change upon electrical (or electrochemical) polarisation.
2. That the electroclijomic colour change according to claim I, may be reversed upon either reversal of the polarisation -or relaxation or open circuit.
3. That the electrochromic colour effect according to claim I may be induced or reversed by a number of different electrochemjcal polarisation protocols -including for example polarisation by a steady state protocol, a ramped or cyclic waveform, pulsed potential waveform - or any other potential polansation procedure as * * *** appropriate. **e* I. * * * S * S.
S S* * *. * &
S
S
S S * 55
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0700233A GB2448676A (en) | 2007-01-06 | 2007-01-06 | Electrochromic colour effects from polymer membranes having conductive coatings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0700233A GB2448676A (en) | 2007-01-06 | 2007-01-06 | Electrochromic colour effects from polymer membranes having conductive coatings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0700233D0 GB0700233D0 (en) | 2007-02-14 |
| GB2448676A true GB2448676A (en) | 2008-10-29 |
Family
ID=37801802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0700233A Withdrawn GB2448676A (en) | 2007-01-06 | 2007-01-06 | Electrochromic colour effects from polymer membranes having conductive coatings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2448676A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4640784A (en) * | 1985-07-29 | 1987-02-03 | Cant Investments Pty. Limited | Method and apparatus for cleaning swimming pools |
| US4749260A (en) * | 1984-08-31 | 1988-06-07 | The Board Of Governors For Higher Education, State Of Rhode Island And Providence Plantations | Variable color transparent panels |
| US4893908A (en) * | 1988-06-27 | 1990-01-16 | Allied-Signal Inc. | Adjustable tint window with electrochromic conductive polymer |
-
2007
- 2007-01-06 GB GB0700233A patent/GB2448676A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4749260A (en) * | 1984-08-31 | 1988-06-07 | The Board Of Governors For Higher Education, State Of Rhode Island And Providence Plantations | Variable color transparent panels |
| US4640784A (en) * | 1985-07-29 | 1987-02-03 | Cant Investments Pty. Limited | Method and apparatus for cleaning swimming pools |
| US4893908A (en) * | 1988-06-27 | 1990-01-16 | Allied-Signal Inc. | Adjustable tint window with electrochromic conductive polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0700233D0 (en) | 2007-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |