Theory The most frequently used and relatively

Using van Oss et al. approach the total surface free Anastrozole of a given surface can be expressed by the sum of contributions of different types of interactions: Lifshits-van der Waals (γsLW) component as well as the electron-donor (γs−) and electron-acceptor (γs+) parameters. This is commonly used as a quantitative measure of wetting of a solid by a liquid, but obviously, the surface tension components of probe liquids have to be known [38] and [39].
3. Materials and methods
3.1. Materials and plasma treatment
3.2. Contact angle measurements
3.3. Topography measurements. FTIR measurements
The roughness and topography of the starch surface were investigated using the optical profilometer (Contour GT-K1, Veeco), which is the optical system measuring topography with high accuracy from a sub-nanometer up to 10 mm size. We have performed such measurements in three different sites for glass plates covered with native starch and its each modification. The same was done after plasma treatment in close proximity on the same sites. The experiment was repeated 3 times. The surface topography was quantified by the parameters: average roughness (Ra), root-mean-squared roughness (Rq), peak-to-valley difference (Rt) and the mean roughness value (Rs). The topography parameters were analyzed by means of WS × M 5.0 (Develop 2.2 Scanning Probe Microscope Software) [42] and [43]. For full characterization of starch surfaces the FTIR spectra were taken with a FTIR Nicolet, Thermo Scientific Inc.