Change in microstructure and surface properties of electrospray-synthesized silica layers

► Silica coated layers with different morphologies are prepared by electrospraying. ► Precursor solutions of low viscosity deposit particulated silica layers, exhibiting superhydrophobicity. ► In contrast, fibrous silica layers that show superhydrophilicity are attained with viscous precursor solutions. ► The dramatic change in the water contact angle without any chemical treatment is useful in many applications.