Dsa100 contact angle analyzer

The hydrophilicity of the prepared films was measured by surveying the sessile drip contact angle using a KRÜSS DSA100 contact angle analyzer (Hamburg, Germany) at 25 °C. Water droplets (4 μL) were dispensed on the surface of the film and the water contact angle was measured. Five points are measured for each sample and averaged.

Four MOX-MS formulations were fixed on a DSA100 contact angle analyzer (KRUSS, Hamburg, Germany) to measure the water contact angle. Deionized water was used as the test fluid and the temperature and humidity were 25 °C and 65%, respectively. The measurement was repeated six times for each sample. The mean value θ was used as the final result.

The hydrophilicity of the film was measured by the sessile drip contact angle using a KRÜSS DSA100 contact angle analyzer (Hamburg, Germany) at 25 °C. The water contact angle was measured by dropping 4 μL water on the surface of the film at a time. Each sample was measured in triplicate. The result was an average of 3 tests.
The swelling ratio was used to characterize the water absorption capacity of the films. The dry films (1.5 cm × 1.5 cm, length × width) were immersed in water. Then, the films were removed out at different intervals and weighed after wiping off excess water with clean paper. The swelling ratio was defined as follows:

where m1 and m2 were the mass of dry and swollen films, respectively. Three replications were performed for each film to ensure the accuracy of the test.