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Titanium dioxide coating

Titanium dioxide coating

Titanium dioxide coating

(OP)
I want to have a thin coating (a few microns) of titanium dioxide on a plastic plate, to make high refractive index surface. Assuming titanium dioxide is in powder form, can I mix the powder with some liquid resin to apply on the plate?
Is there any ready-to-apply titanium dioxide in  liquid form?  Thanks.
       Peter
        

RE: Titanium dioxide coating

Titanium dioxide powder applied in liquid resin = white paint.

You will need to use a Physical Vapor Deposition (PVD) process requiring a vaccum system. Evaporation is easiest, but requires a minimum substrate temperature of 250oC for optical coatings. http://www.cerac.com/pubs/proddata/tio.htm
 
Since this temperature is too high for most plastics, you may need to deposit via sputtering.  Find a vacuum coatings vendor.

RE: Titanium dioxide coating

Some more info.  This is possible with the right nano particles of titanium dioxide.  
Colorscience uses TiO2 particles ~50 nanometers (0.05 micron) in a clear sunscreen 'Sunforgettable' and cosmetics. The supplier & technical details, such as the the degree of opacity of the particles prior to wetting by the carrier liquid, are not disclosed.
http://www.colorescience.com/800x600/flash/index.html

A scientific abstract mentions TiO2 nano particles coated with a film of silica:  http://nanodot.org/article.pl?sid=02/08/02/0752217
The supplier is Shenzhen Chengyin Technology http://www.chengying.com/product-nme.htm
It seems that the TiO2 particles (available in av. sizes 50 & 25 nm) are white, but the liquid, perhaps with the aid of the silica film coating, makes the overall dispersion appearance 'Liliquoid.'

Not your ordinary TiO2 particles! Seems worth investigating.  Good luck, and please post any results.
Ken

RE: Titanium dioxide coating

(OP)
Thanks for the information. For my application the white paint may be good enough.

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