silanes of the general formula (CH3)2NSi(CH3)2CnH2n+1 (n = 1, 4, 8, 16) and fluoroalkyl silanes of the general
formula
(R = (CH2)2CF3, (CH2)3-iso-C3F7, (CH2)3-n-C3F7, (CH2)3-n-C6F13, (CH2)3-tert-C6F13) on quartz. Advancing and receding contact angles for water, dodecane, pentadecane, and ethylene glycol
on modified surfaces were measured by the capillary rise method. Significant wetting hysteresis was observed
for water. Additional silanization of the samples with an excess of silanizing agents with small molecules (tri-
methyl- and butyldimethyl silanes) has almost no influence on the wetting of the investigated surfaces by water.
When the surface is wetted by hydrocarbons, hysteresis is low. Grafted monolayers containing fluorocarbon
groups are wetted much more poorly than grafted hydrocarbon monolayers. Correlations between the structure
of an organosilicon modifier and wetting of the modified surfaces by water and hydrocarbons are obtained. The
values of Zisman’s critical surface tension were also determined for the modified surfaces.