The surface hydrophobizing agent was hexamethyldisilazane (HMDS), commonly known as HMDS. Owing to the glass activation with the use of a plasma generator, hydrophobic surfaces were obtained. Glass plates were activated with the low-temperature air plasma for 0.5 to 30 minutes. The activated glass was transferred to a desiccator containing 10 ml of HDMS. The hydrophobization lasted 24 h, after which the samples were transferred to a temperature controlled chamber and kept for 1 h at 20 - 130 ° C. Hydrophobization is favoured by a longer time of the glass plates surface activation with plasma. When the activation was carried out for 20 minutes at all temperatures, it was possible to obtain the surfaces with the contact angles above 90 °. Extending the activation time did not cause any significant changes in the contact angles values. In the case of the shortest activation time, the hydrophobic effect was achieved only when the glass plates were dried at a temperature above 100 ° C. The coating does not decrease significantly the light transmittance in the range of 300-1200 nm.

Plasma activated glass surface hydrophobization by hexamethyldisilazane

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