Thermal pretreatment of silica composite filler materials.
Three different silica filler materials were thermally treated in order to effect dehydration, dehydroxylation, and rehydroxylation. Samples were characterized by thermogravimetry (TG), pycnometry, elemental analysis, and scanning electron microscopy (SEM). For all fillers, our results indicate incremental removal of silanol groups at higher heating temperatures and irreversible dehydroxylation at over 673 K. To remove the organic content and maintain adequate silanol density for subsequent silanization on Stöber-type silica, we suggest heating at 673 K followed by overnight boiling in water.
Wan
Quan
Q
Center for Bioengineering and Biomaterials, College of Engineering, Temple University, 1947N, 12th Street, Philadelphia, PA 19122, USA.
Ramsey
Christopher
C
Baran
George
G
J Colloid Interface Sci. 2005 Jan 15;281(2):339-50
15571689
J Colloid Interface Sci. 2005 Dec 1;292(1):139-47
16009370
J Colloid Interface Sci. 2003 Aug 15;264(2):354-61
16256651
J Biomed Mater Res. 2000;53(3):204-10
10813758
J Res Natl Inst Stand Technol. 2005 Oct 01;110(5):541-58
27308178
Dent Mater. 2008 Dec;24(12):1694-701
18499245