Concept:Nanomaterials are engineered materials with unique properties at the nanoscale, used in advanced applications.
Explanation:Nanomaterials are widely used in scratch-proof glasses because their coatings make the surface hard and resistant to scratches.
They are used in electronic devices to make components smaller, faster, and more energy efficient.
Self-cleaning materials use nanoparticle coatings that break down dirt or repel water, keeping surfaces clean.
Conventional water treatment, however, relies on traditional methods like filtration, sedimentation, and chlorination.
These traditional processes do not generally require or use nanomaterials.
Therefore, among the given options, nanomaterials are not applied in conventional water treatment.
Answer:Option C: Conventional water treatment.