Oca15pro system

The hydrophilicity of the samples was investigated via water contact angle measurement (CA), which was performed using an OCA15Pro system (DataPhysics, Filderstadt, Germany) at room temperature. The sample masses (m), which change during the water adsorption phase as a function of time (t), were monitored. The initial slope of the function m² = f (t) is known as capillary velocity, which can be used to determine the contact angle between the solid (polymer sample) and water using a modified Washburn equation [33 (link),34 (link)]. All measurements were performed on three independent samples (each representative formulation on Si wafers) from three different sample areas. For this purpose, we applied a drop volume of 3 μL (in three replicates) of each sample. An average SCA value with the standard error was calculated using the hardware manufacturer’s software (software version 20.2.0).

Measurements were performed using OCA15 Pro system from DataPhysics (Filderstadt, Germany). After focusing the sample, $\text{2-}\mathsf{\mu }\mathrm{L}$ drop of de-ionized water was released on top of the surface for digital image capture. Contact angle measurements were performed using SCA 20 software from DataPhysics.

The hydrophilicity of the samples was determined by the static water contact angle method (SCA) performed on an OCA 15 Pro system (Dataphysics, Filderstadt, Germany) at ambient temperature. All measurements were performed on three independent samples (for each sample on Si-wafers) on three different sample areas. For this purpose, one drop of ultrapure water (3 μL) was applied to each sample. Each SCA value averaged at least three water drops per surface. An average SCA value with the standard error was calculated using the hardware manufacturer’s software (version 20.2.0).