geneiusxie
Aerospace
- Mar 10, 2013
- 52
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:
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:
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.
