c4.6 nanoparticles

• What are nanoparticles?

  Really tiny particles with a diameter between one nanometer and 100 nanometers
• Why can't we see nanoparticles with a light microscope?

  Because they are smaller than $0.000000001\text{ m}$
• What is the field of science that studies nanoparticles?

  Nanoscience
• What is a key feature of nanoparticles related to their size?

  They have a very large surface area to volume ratio
• Why does the surface area to volume ratio increase as particles get smaller?

  Because volume decreases more rapidly than surface area
• How does the surface area of nanoparticles benefit their use as catalysts?

  More exposed surface area speeds up chemical reactions
• What is one application of nanoparticles in medicine?

  Delivering drugs directly to cells
• What are fullerenes made of?

  Carbon atoms
• Why are nanoparticles exciting for electrical circuits?

  Some can conduct electricity, enabling tiny computer chips
• What antibacterial property do silver nanoparticles have?

  They can kill bacteria
• How are silver nanoparticles used in surgical masks?

  They are infused to reduce the chance of infection
• What is a concern regarding the effects of nanotechnology?

  Its effects on our bodies are not fully understood
• What is a potential risk of nanoparticles in sunscreens?

  They may enter the body and cause damage
• What happens to nanoparticles when they are washed into the sea?

  Their environmental impact is not fully known
• Why do some people advocate for stricter regulations on nanoparticles?

  To ensure safety and proper labeling of products containing them