An organosilane coating deposited by a sol-gel process would be a good transparent binder, which would have the advantage of being compatible with the TiO2 and be reasonably easy to get and keep the TiO2 dispersed. You need to ensure that these particles do not agglomerate in the coating (typically by controlling the surface charge by maintaining a low pH ) or your coating will turn milky. I would suggest a solution of methyl trimethoxy silane in ethanol. Take care to observe the relevant health and safety precautions as the reaction (with atmospheric moosture) releases toxic methanol. PDMS as suggested by Sunita is also a possibility but will be less durable as it cannot form a 3 dimensional cross linked structure.

You might try hot melt adhesives, e.g. ethylene-vinly acetate or other ethylene copolymers with polar comonomers (e.g maleated PE, EAA, inomers etc) (tie layer resins used in multilayer films). You should check whether they contain enough comonomer to decrease the crsytallinity. You should check the transparency at the required thickness. You may also try epoxy resins.

thnaks Gyorgy, do these adhesives remain inert to TiO2 without effecting its surface properties?

I just want to immobilize TiO2 nanoparticles on a transparent surface which remains intact in rain etc.

I'd suggest using an optical grade epoxy. Epo-tek do a range of these. Whether it's inert to Ti02 specifically, I don't know. Once cured, it's inert to practically anything.

Not at all Marco, if Modification made by Yasir was at surface, then there's good chances the degradation behaviour is hindred. Anyway, tests results will tell.

PolyDimethyl Siloxane (PDMS ) can be tried...

Epoxy Resin is excellent for mechanical properties and weather resistance and may be easily available and cheap.

An organosilane coating deposited by a sol-gel process would be a good transparent binder, which would have the advantage of being compatible with the TiO2 and be reasonably easy to get and keep the TiO2 dispersed. You need to ensure that these particles do not agglomerate in the coating (typically by controlling the surface charge by maintaining a low pH ) or your coating will turn milky. I would suggest a solution of methyl trimethoxy silane in ethanol. Take care to observe the relevant health and safety precautions as the reaction (with atmospheric moosture) releases toxic methanol. PDMS as suggested by Sunita is also a possibility but will be less durable as it cannot form a 3 dimensional cross linked structure.

Thank you all,

@Simon, Hi

do you mean that I mix TiO2 precursor along with silane, heat at high temperature to cure and disperse the anatase NPs which will bind them to the glass substrate? what temperatures are required for this?

Regarding the silane in my opinion any organosilane should be work. Regarding the photoactivity of TiO2 be sure that TiO2 is not in anatese form due this form is much more photoactive than rutile or brookite and will degraded any organic material as Marco has suggested on a previous post.

I am not very familiar with TiO2 particles but I deal a lot with Si and SiO2 nanoparticles. I agree with Simon on using a trimethoxysilane. To be precise, I use 3-Glycidoxypropyl trimethoxysilane, which is typically used as a scratch resistant coating for eyeglass in addition to being a coupling agent, and you can easily purchase from someone like Gelest or Sigma Aldrich. I typically use this in IPA and have seen great adhesive properties with no residue effects on the surface (we typically bond to glass and glass-like surfaces). You may also want to try putting some kind of "primer" on the surface first so that the you achieve even greater adhesive durability.

Use a melamine formaldehyde crosslinked, acid catalysed, thermoset polyester resin.

All these solutions may work, but the answer would relate to your application. If you are targeting the photocatalytic properties, be aware that the photo-induced holes in the TiO2 have to react with water, on the TiO2 surface. Therefore, by using any of the above polymers you will hinder this process.

Polyurethane glues seem like a good choice, strong, stick to everything and water/weather proof. Do a google search. Lots of info.

First thing, what you need to approach. The choose the glue, PU, Epoxy or other material could be candidates

Further to Simon's answer can I suggest the use of a basic ph. I have found in my own work that a basic Ph is more controllable as an acid can often run off and be difficult to control.

The transmission of such dispersions depend both on the particle size, so you indeed need to avoid clustering, but also on the refractive index difference between particle and matrix. You can calculate how small the particles must be using the Rayleigh limit, or how small the refractive index difference must be for the particle size you have. See also Chapter 7 in the attached thesis.

TiO2 pigments imparts high opacity. Translucent white films are possible, but transparent seems to me very difficult. See for instance the link http://www.specialchem4polymers.com/tc/titanium-dioxide/index.aspx

Try a Zonyl family products from DuPont

E.g., Zonyl 8740. Check online, there are a plenty of them, with slightly different specifications.

Try the Zonyl family products, most of them are designed for this.

 Weather resistant? How about rutile-type TiO2 (lower photo-catalytic effect than anatase)?