| abstract |
Surface-modified, pyrogenically prepared silica is prepared by subjecting the pyrogenically prepared silica, which is in the form of aggregates of primary particles and possesses a BET surface area of 200±25 m 2 /g, the aggregates having an average area of 7000 to 12 000 nm 2 , an average equivalent circle diameter (ECD) of 80 to 100 nm and an average circumference of 850 to 1050 nm, to surface-modification in a known way. It can be used for thickening liquid systems. |