Coating/dye that absorbs infrared light but reflects visible light
Coating/dye that absorbs infrared light but reflects visible light
(OP)
Hey guys,
I tried asking google multiple times but I could never find a white or transparent dye or coating that is designed to radiate infrared light yet reflect visible light. I would also prefer to be able to integrate the coating in the anodizing in aluminum for better durability. (not sure exactly what makes a dye compatible with anodizing though)
The closest thing I could find is this:
http://www.epolin.com/product/1125#tabs_2
The only problem is that it looks green and I'm not sure how much it will cost.
Background:
Of course, normally, emmissivity is directly proportional to the absortivity - so a blackbody - a fully "black" object in the infrared spectrum would emit as much infrared radiation as possible at a given temperature. Therefore, hot objects that have a coating that absorbs infrared light will cool down faster - that's why black anodized LED flashlights stay about 10 degrees cooler than bare aluminum ones when on a table - it's not just about convection cooling. However, sometimes white objects are more aesthetically pleasing to certain consumers, so it can be useful to have access to a coating that reflects most visible light so it looks "white" or "clear" but absorb (and therefore emit) a high proportion of infrared radiation.
I tried asking google multiple times but I could never find a white or transparent dye or coating that is designed to radiate infrared light yet reflect visible light. I would also prefer to be able to integrate the coating in the anodizing in aluminum for better durability. (not sure exactly what makes a dye compatible with anodizing though)
The closest thing I could find is this:
http://www.epolin.com/product/1125#tabs_2
The only problem is that it looks green and I'm not sure how much it will cost.
Background:
Of course, normally, emmissivity is directly proportional to the absortivity - so a blackbody - a fully "black" object in the infrared spectrum would emit as much infrared radiation as possible at a given temperature. Therefore, hot objects that have a coating that absorbs infrared light will cool down faster - that's why black anodized LED flashlights stay about 10 degrees cooler than bare aluminum ones when on a table - it's not just about convection cooling. However, sometimes white objects are more aesthetically pleasing to certain consumers, so it can be useful to have access to a coating that reflects most visible light so it looks "white" or "clear" but absorb (and therefore emit) a high proportion of infrared radiation.





RE: Coating/dye that absorbs infrared light but reflects visible light
http://en.wikipedia.org/wiki/Cold_mirror
RE: Coating/dye that absorbs infrared light but reflects visible light
RE: Coating/dye that absorbs infrared light but reflects visible light
http://www.italfinish.com/ita/default.asp
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RE: Coating/dye that absorbs infrared light but reflects visible light
RE: Coating/dye that absorbs infrared light but reflects visible light
RE: Coating/dye that absorbs infrared light but reflects visible light