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Evaluate the use of nanoparticles for specific purposes

Bonding, structure and the properties of matter • Bulk and surface properties

Key concepts

What you'll likely be quizzed about

  • Nanoparticles are defined as having dimensions in the 1–100 nm range.
  • Their small size results in an increased surface area to volume ratio, heightening the proportion of atoms at the surface and altering chemical reactivity.
  • Properties such as melting point, catalytic activity, and optical behavior change due to size.
  • Quantum effects become significant at the lower nanometer scale, which alters electronic and optical properties when compared to bulk materials.

Flashcards

Test your knowledge with interactive flashcards

What is a primary benefit of titanium dioxide nanoparticles in sunscreens?

Click to reveal answer

Titanium dioxide nanoparticles provide broad-spectrum UV protection while remaining transparent on skin.

Key notes

Important points to keep in mind

Define nanoparticles by size: 1–100 nm.

Use cause and effect: property causes function; limiting factors prevent function.

Compare effectiveness at realistic doses rather than ideal lab conditions.

Check stability and aggregation; both reduce active surface area.

Require multiple evidence types: in vitro, in vivo, lifecycle analysis, and field data.

Assess selectivity to avoid harmful off-target effects.

Consider environmental persistence and bioaccumulation before large-scale use.

Balance performance benefits against toxicity, cost, and regulatory constraints.

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