Comparison between electroosmotic properties of an empty FS capillary and silica frits produced with varying water content.

Ri/L values were measured on capillaries filled with a 9:1 mix of 100 mM NaCl and PBS with pH 7.4. Standard deviation (last column) compares data from all frits, even though the recipe was intentionally varied, demonstrating the favorable reproducibility of devices made with the method described here.