6533b828fe1ef96bd1289046

RESEARCH PRODUCT

Intrinsic generation of OH groups in dry silicon dioxide upon thermal treatments

Laura NuccioRoberto BoscainoSimonpietro Agnello

subject

Hydrogen compoundsIr absorptionPhysics and Astronomy (miscellaneous)Silicon dioxideInorganic chemistryInfrared spectroscopysistemi amorfi difetti di puntoAtmospherechemistry.chemical_compoundchemistryThermalMoleculeOrganic chemistryBar (unit)

description

We show the existence of an intrinsic generation mechanism of OH groups in synthetic dry silica upon thermal treatments. Samples are treated for ~160 h at 390 °C in He at 2.7 or 180 bar, and the growth of the OH IR absorption band at 3670 cm−1 is observed. An OH concentration of ~10^18 cm^−3 is estimated. Possible contributions of reactions with molecules absorbed from the atmosphere are excluded. Reactions with H2O already contained in the samples are rejected by IR measurements. The observed OH generation is attributed to the reaction of network sites with H2 already present in the material. Possible reaction paths are examined

yearjournalcountryeditionlanguage
2008-10-13
10.1063/1.2998581http://hdl.handle.net/10447/38970