The porosity of sol-gel silica thin films for optrode applications

Conference · Fri Dec 01 00:00:00 EST 1995

OSTI ID:126239

Harris, T M; Knobbe, E T ^[1]

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1. Oklahoma State Univ., OK (United States)

Porous silica thin films produced by sol-gel processing are being considered for use in optical sensor (optrode) applications. In this study, thin films were produced by dip-coating onto glass slides. The porosity was then measured indirectly, by determining the amount of methylene blue adsorption on each slide. Using this technique, it has been determined that the {open_quotes}two-step{close_quotes} sol-gel process provides a greater surface area than the acid-catalyzed process. With the two-step process, increasing the amount of solvent (ethanol) and decreasing the rate of slide withdrawal from the sol provided increased surface area when normalized to the mass of the deposit.

• OSTI ID: 126239
• Report Number(s): CONF-950402-; TRN: 95:006086-0219
• Resource Relation: Conference: 209. American Chemical Society (ACS) national meeting, Anaheim, CA (United States), 2-6 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of 209th ACS national meeting; PB: 2088 p.
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
36 MATERIALS SCIENCE
SILICA
SURFACE AREA
OPTICAL EQUIPMENT
DESIGN
DIP COATING
POROSITY
SOL-GEL PROCESS
THIN FILMS