Antibacterial Activity of Hydrophobic Composite Materials Containing a Visible-Light-Sensitive Photocatalyst

<table>Recovery of water contact angles for N-doped TiO<sub>2</sub>-PTFE hydrophobic composite coating contaminated with 0.5 vol.% oleic acid diluted in <i>n</i>-heptane, during exposure to 1 mW <svg height="5.4499998" id="M32" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 4 5.4499998" width="4" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,5.388)"><path d="M170 255q0 -25 -16 -41t-40 -16t-40 16t-16 41t16 41.5t40 16.5t40 -16.5t16 -41.5z" id="x22C5"></path></g>
</svg> cm<sup>–2</sup> of UV-A light for 230 hours. A PTFE composite coating without the addition of N-doped TiO<sub>2</sub> was used as the control sample. (a) water droplet on the PTFE plus 12% NT surface without UV illumination. (b) water droplet on the PTFE plus 12% NT after UV illumination. (c) water droplet on the control sample after UV illumination for 23 hours. Graph symbols represent <i>⚫</i>: PTFE plus 12% NT, Oleic acid (−); ○: PTFE plus 12% NT, Oleic acid (+); ▲: Control, Oleic acid (−); △: Control, Oleic acid (+).</table>

Journal of Nanotechnology

fig7

Figure 7

Figure 7: Antibacterial Activity of Hydrophobic Composite Materials Containing a Visible-Light-Sensitive Photocatalyst 