Conductive Paint Lessons: Difference between revisions
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* Opaque paint | * Opaque paint | ||
** Nickel: | ** Nickel (Ni): | ||
*** Higher resistance - ~5-6 ohms per square | *** Higher resistance - ~5-6 ohms per square | ||
*** Cracks when dried and flexed - [http://someoneknows.wordpress.com/2008/12/06/desktop-fabrication-wearable-electronics-circuitry/ Desktop Fabrication: Wearable Electronics Circuitry] | *** Cracks when dried and flexed - [http://someoneknows.wordpress.com/2008/12/06/desktop-fabrication-wearable-electronics-circuitry/ Desktop Fabrication: Wearable Electronics Circuitry] | ||
** Copper (Cu): | |||
** Copper: | *** Higher resistance - ~5 ohms per square. | ||
*** Higher resistance - ~5 ohms per square | |||
*** Reasonably priced - ~$30 for 4 oz | *** Reasonably priced - ~$30 for 4 oz | ||
*** We bought CuPro-Cote #292-4 from [http://www.lessemf.com/paint.html Less EMF Inc.], which wasn't viscous, not even quite as viscous as tempera paint. It also forms subtle flakes and could potentially crack like the Ni paint. | |||
** Silver (Ag): | |||
*** Low resistance - ~0.1 ohms per square according to [http://someoneknows.wordpress.com/2008/12/06/desktop-fabrication-wearable-electronics-circuitry/ Desktop Fabrication: Wearable Electronics Circuitry]. The type we bought ([http://www.mgchemicals.com/products/842.html MG Chemicals 842-20G)] promises 0.2 ohms/mil (or ~7.9 ohms/mm) | |||
*** Expensive - ~$30 for 0.7 oz (20 g) from [http://www.lessemf.com/paint.html Less EMF Inc.] | |||
* Transparent paint | * Transparent paint | ||
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** Wire glue - $4 for 0.3 oz | ** Wire glue - $4 for 0.3 oz | ||
** Conductive pen | ** Conductive pen | ||
==Heeds== | ==Heeds== | ||
* Shake paint well to ensure metal particles are well dispersed | * Shake paint well to ensure metal particles are well dispersed. Better yet, stir it a lot! | ||
* Keep ink wet while working with it. If work time is protracted, mix paint frequently | * Keep ink wet while working with it. If work time is protracted, mix paint frequently | ||
* Resistivity measures are suppose to be accurate only when paint has fully dried | * Resistivity measures are suppose to be accurate only when paint has fully dried | ||
* Some paints are more dilute than others. One guy used silver paint, which bled beyond his mask ([http://accelenation.com/?ac.id.121.1 accelenation.com]). | |||
==Uses== | |||
* Auto repair | |||
** It may be cheaper to purchase conductive paint as the rear window defogger paint at the auto store. I haven't done so. Most defoggers use copper paint. | |||
* | * Microscopy, i.e. scanning electron microscopy (SEM) | ||
** Companies specializing in SEM equipment note that some paints particularly plantinum may need to be placed in an ultrasonic bath for a few minutes ([http://www.2spi.com/catalog/spec_prep/platinum-paint.shtml SPI Supplies]) | |||
** Microscopy often utilizes different concentrations of metal particles in conductive paint, so these websites can provide you with a gradient of resistivity in their inventory of paints. M.E. Taylor's [http://www.semicro.org/ SEMicro] division has three concentrations of silver paint: 18%, 36%, and 50% Ag. | |||
* Paper printed circuit board by Peter Blasser | * Art | ||
** Paper Circuits by Leah Buckley: conductive paint, magnetic paint, magnets | |||
** Paper printed circuit board by Peter Blasser |
Latest revision as of 19:30, 23 November 2010
Lessons on Conductive Paint[edit]
Related to Pulse Choker Hack Notes for July 15th, 2009:
"We tried silk screening silver conductive paint (MG Chemicals 842-20G) onto two different types of fabric, a water resistant one and a water proof "leather like" one. Both showed very high resistance (higher than the meter can read) even for very short thick traces. It looks really cool though - hopefully we can figure out what we're doing wrong, and make this work. We also tried measuring the resistance of a huge dollop of paint on the spoon: silver = infinite resistance (!), copper = 200kOhms. It didn't matter if the paint was dried or wet. Note that we shook the bottle prior to use to ensure that the silver particles were dispersed evenly."
Types of Conductive Paint[edit]
- Opaque paint
- Nickel (Ni):
- Higher resistance - ~5-6 ohms per square
- Cracks when dried and flexed - Desktop Fabrication: Wearable Electronics Circuitry
- Copper (Cu):
- Higher resistance - ~5 ohms per square.
- Reasonably priced - ~$30 for 4 oz
- We bought CuPro-Cote #292-4 from Less EMF Inc., which wasn't viscous, not even quite as viscous as tempera paint. It also forms subtle flakes and could potentially crack like the Ni paint.
- Silver (Ag):
- Low resistance - ~0.1 ohms per square according to Desktop Fabrication: Wearable Electronics Circuitry. The type we bought (MG Chemicals 842-20G) promises 0.2 ohms/mil (or ~7.9 ohms/mm)
- Expensive - ~$30 for 0.7 oz (20 g) from Less EMF Inc.
- Nickel (Ni):
- Transparent paint
- Orgacon from Agfa - conductive, can be flexed, transparent, can be silk-screened
- Alternatives
- Wire glue - $4 for 0.3 oz
- Conductive pen
Heeds[edit]
- Shake paint well to ensure metal particles are well dispersed. Better yet, stir it a lot!
- Keep ink wet while working with it. If work time is protracted, mix paint frequently
- Resistivity measures are suppose to be accurate only when paint has fully dried
- Some paints are more dilute than others. One guy used silver paint, which bled beyond his mask (accelenation.com).
Uses[edit]
- Auto repair
- It may be cheaper to purchase conductive paint as the rear window defogger paint at the auto store. I haven't done so. Most defoggers use copper paint.
- Microscopy, i.e. scanning electron microscopy (SEM)
- Companies specializing in SEM equipment note that some paints particularly plantinum may need to be placed in an ultrasonic bath for a few minutes (SPI Supplies)
- Microscopy often utilizes different concentrations of metal particles in conductive paint, so these websites can provide you with a gradient of resistivity in their inventory of paints. M.E. Taylor's SEMicro division has three concentrations of silver paint: 18%, 36%, and 50% Ag.
- Art
- Paper Circuits by Leah Buckley: conductive paint, magnetic paint, magnets
- Paper printed circuit board by Peter Blasser