Dear Satej Chaudhary

Try fluorosilanes. They typically are straight-chain alkanes terminated by a
silicon with three chlorines, ethoxide, or methyl groups. There's a
selection available from Gelest. They should be easy to apply on piranha
acid-treated glass. I think they can provide suitable instructions.

These seem to fit the bill (product no., name, CAS No., Formula):

SIT8170.0 (TRIDECAFLUORO-1,1,2,2-TETRAHYDROOCTYL)DIMETHYLCHLOROSILANE
102488-47-1 C10H10ClF13Si

SIT8172.0 (TRIDECAFLUORO-1,1,2,2-TETRAHYDROOCTYL)METHYLDICHLOROSILANE
73609-36-6 C9H7Cl2F13Si

SIT8174.0 (TRIDECAFLUORO-1,1,2,2-TETRAHYDROOCTYL)TRICHLOROSILANE 78560-45-9
C8H4Cl3F13Si

SIT8175.0 (TRIDECAFLUORO-1,1,2,2-TETRAHYDROOCTYL)TRIETHOXYSILANE 51851-37-7
C14H19F13O3Si

SIH5840.4 (HEPTADECAFLUORO-1,1,2,2-TETRAHYDRODECYL)DIMETHYLCHLOROSILANE
74612-30-9 C12H8ClF17Si

SIH5840.6 (HEPTADECAFLUORO-1,1,2,2-TETRAHYDRODECYL)METHYLDICHLOROSILANE
3102-79-2 C11H5Cl2F17Si

SIH5841.0 (HEPTADECAFLUORO-1,1,2,2-TETRAHYDRODECYL)TRICHLOROSILANE
78560-44-8 C10H2Cl3F17Si

SIH5841.2 (HEPTADECAFLUORO-1,1,2,2-TETRAHYDRODECYL)TRIETHOXYSILANE
101947-16-4 C16H17F17O3Si


on 19/2/2002 7:13 PM, Satej Chaudhary at satej7ua@yahoo.com wrote:

> Could someone suggest a way to make a glass surface as
> hydrophobic like teflon? Teflon spin coating is too
> expensive. Has any body had success with chloro/fluoro
> organic polysiloxanes or silanes? I need a film that
> dosnt get too thick (a few ten Angstroms)

--
Christopher F. Blanford
Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK
Phone: (44)/(0)-1865-282603; Fax: (44)/(0)-1865-272690
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