Table 3.

Thickness and roughness of R-IgG protein layers deposited on various substrates. (Measurements taken with Digital Instruments Series IV AFM)

Substrate	Protein Layer Thickness	Protein Layer Roughness	Number of Circles	Number Points per Circle
Porous Silica	5 ± 2 nm	0.6 ± 0.3 nm	4	8
Untreated Glass	4 ± 1 nm	1.0 ± 0.9 nm	4	8
APTES Treated Glass	3 ± 2 nm	1.0 ± 1.0 nm	4	8
Glutaraldehyde Treated	2 ± 1 nm	0.5 ± 0.7 nm	4	8