The hydrophobicity can be achieved simply by coating with wax BUT this will only be temporary.  

But wax is not transparent and dust particles will stick to it easily. I am looking for some advanced materials which can be used for permanent, clear, water and dust repellant coatings.

The usual method for repelling water or other contaminants is by modifying the surface with fluoroalkanes.  Many of the existing systems for making a surfaces amphiphobic involve depositing high surface area (very small) silica and covering it with fluoroalkanes.  One publication among many:

http://pubs.acs.org/doi/abs/10.1021/la050901r

You can also take a look at the wetting models, particularly Wenzel or Cassie-Baxter http://en.wikipedia.org/wiki/Wetting

These also apply for dust repellent surfaces as in the oft cited lotus leaf (http://en.wikipedia.org/wiki/Lotus_effect)

I would use a fluorinated silane, the silane would react with the surface OH groups on the glass coating the glass with a monolayer of the silane. It will probably last for a few weeks, but slowly is likely to degrade

1H,1H,2H,2H-Perfluorodecyltrichlorosilane from Fluorchem would work nicely as would perfluorooctyltriethoxysilane from Aldrich , but others exist

Dear Prof. E. Habib and Prof. Luckham thanks for reply,

Can We replace fine silica with fine alumina or some other ceramics.

Yes the silanes react with any surface OH groups, so as long as they are present it will work. I have tried it with mica and it doesnt work too well as there are not really any surface OH groups there, although I suspect it does react with adsorbed water on the mica surface, They are very reactive though so handle the material carefully as you have lots of OH groups too!

Paul

Yaa, normally the material having high hydrophobicity property used to restrict the water and dust particles, now a days RTV coating is famous, Especially used in an electrical Insulators. 

I also suggest to use silanes. OTS or HMDS are usually applied, e.g. in microelectronics or semiconductor industries. You can obtain contact angles with water for OTS of about 110° and with HMDS in the range of 90°.

Please have a look to our publication on printing of OTS: http://pubs.rsc.org/en/journals/journalissues/cp?issueid=cp015020&type=current#!issueid=cp015020&type=current&issnprint=1463-9076

Printing will not result in very good monolayers. Therefore we have lower performance but the advantage of patterning (have a look to the back cover - you can see the hydrophobic properties. I suggest that you use a chemical bath. Important is to clean the glass before carefully and to increase OH groups at the surface. 

You can methylate the glass with trimethylchlorosilane (TMCS). It is important to avoid any trace of water since TMCS reacts promptly with water.

Please refer to R. Crawford, L. K. Koopal, J. Ralston, Colloids and Surfaces, 27 (1987) 57.

Sure. The same is valid for OTS or HMDS etc. It will immidiately polymerize with water.

You would try surface treatment such as cold plasma that is effective to change the surface tension and contac angle.

Dear Jorge,

Can you tell me something about cold plasma technique. Is there any research article on the application of this technique over clear glass to modify the surface tension and contact angle.

Lalit I think you may use silicon based super hydrophobic materials(like fluorinated

silane molecules). I tried on glass using electro-spinning, normal spray also works(gives hydrophobic but not super hydrophobic), it is transparent and having very good superhydrophobic property. May see this paper...or attached paper.

M.K. Sarkar, F. He, J.T. Fan, Thin Solid Films 518 (2010) 5033–5039.

Some transparent superhydrophobic materials are readily available in the market: https://www.youtube.com/watch?v=7is6r6zXFDc, see this video. I spray similar product on Mock leathers, and it works very nicely after drying in oven.

Superhydrophobic is the only way to prevent soiling sustainably and to be water repellent.

My company is developing transparent superhydrophobic coatings that can be grafted on glass which presents a good resistance to abrasion. 

Feel free to contact me!

http://www.surfactis.com/transparent-superhydrophobic.html

Thanks Manas and David....

I'd go with OTS like Enrico suggested.  Just plasma clean beforehand and dip it in 100 uL OTS in 100 mL pentane.  Let it sit a couple minutes, rinse with pentane, rinse with water, and dry.

I send you an link:

Formation and characterization of hydrophobic glass surface treated by atmospheric pressure He/CH4 plasma.

Available on: http://connection.ebscohost.com/c/articles/94302273/formation-characterization-hydrophobic-glass-surface-treated-by-atmospheric-pressure-he-ch4-plasma

I have used TiO2 in different thickness as well as a nano-spray on the glass surface in order to create self-cleaning property for solar applications. The results were published recently in Solar Energy Journal.

I've attached the paper here.

There are two techniques through which you can repel dust and contaminants from the glass used in outdoor conditions. Firstly, you can make the glass surface as super-hydrophobic by increasing its water contact angle. For these type of coating you can use porous silica nano-particles coatings. Second way is to use photo catalytic layer of nanoparticles. For this you can use Titania nano-particles coating.

can anyone suggest me how to get the specifications of the chemicals which can be used over soalr panels as anti dust and anti reflection coating