MacDonald, John C.
Timko, Michael T.
Control of zeolite external surface hydrophobicity was achieved by covalently bonding organosilane molecules of varying alkyl chain length. The hydrophobicity was characterized by measurement of static contact angle, finding that zeolite hydrophobicity increased after silanization. To quantify the effect, gravimetric measurements were performed to estimate the mass of coating acquired by the zeolites during silanization. When combined with external surface area measurements,the finding was that the modest coatings (>10 mg/cm2) transformed the zeolite surface hydrophobic; increasing the coating density beyond this critical loading had little effect. This work provides a rational basis for determining the optimal coating density required for a given application.
Worcester Polytechnic Institute
Major Qualifying Project
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Chemistry and Biochemistry