Nanoparticles Flashcards

1
Q

What is surface area to volume ratio?

A
  • The smaller the particle
  • The larger the surface area to volume ratio.
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2
Q

If you decrease the side of a cube by a scale factor of 10, what happens to the SA to volume ratio?

A
  • The SA: V ratio increases by a scale factor of 10.
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3
Q

True or False. Nanosilver has the same properties as normal silver.

A
  • False. They have different properties.
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4
Q

How big are nanoparticles?

A
  • They are between 1 and 100nm.
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5
Q

What is the size of coarse particles?

A
  • Between 10000nm and 2500nm
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6
Q

What is the size of fine particles?

A
  • Between 100nm and 2500nm
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7
Q

What is the SA: V ratio for a cube with side length 10nm?

A

3nm: 5nm =
0.6

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8
Q

How is the property of nanoparticles having a large SA: V ratio useful in catalysts?

A
  • More collisisions with reactants
  • Less of material needed rather than NORMAL PARTICLES.
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9
Q

About how many atoms are in a nanoparticle?

A
  • A few hundred atoms.
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10
Q

How are nanoparticles used to deliver drugs into the body?

A
  • Drug trapped in fullerene
  • Deliver drugs to correct cells without opening and damaging other cells.
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11
Q

What nanoparticles have antibacterial properties and where can they be used?

A
  • Silver nanoparticles
  • Deodrants, wound dressings, surgical masks.
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12
Q

Why can nanoparticles be used in moisturisers?

A
  • They have properties to make them not oily.
  • Good coverage
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13
Q

What are nanotubes used for?

A
  • Composites
  • Electrical circuits
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14
Q

Explain why nanotubes could be used in tennis rackets.

A
  • They have high tensile strength
  • Won’t add too much weight.
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15
Q

Why are nanoparticles useful in sun cream?

A
  • Better UV protection
  • Better coverage
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16
Q

What are the 3 main issues with use of nanoparticles?

A
  • May damage cells when absorbed into skin
  • If washed away, could damage environment.
  • No one knows long - term effects of nanoparticles.
17
Q

Q.)

Some of the public are worried about nanotechnology and potential health concerns. What could the company do to reduce the customers concerns?

A
  • Hire independent scientists to investigate more.
  • Label products w/ nanoparticles
18
Q

Q.)

A company wants to put nanocrystal of silver into their socks
a) Give a reason why they would prefer nanocrystals over coarse grains of silver?

A
  • Less needed
  • More effective
19
Q

Why are nanoparticles really useful?

A
  • Reduce carbon footprint (less of material needed.)
  • New technologies
20
Q

What is the material where nanoparticles are derived from called?

A
  • Called bulk materials.
21
Q

Suggest why some companies that make sun creams might not want to do more tests for nanoparticles.

A
  • Tests = expensive
  • Don’t want to damage profits.
22
Q

How big are fine particles?
(Diameter - wise)

A

Diameters between 100 and 2500nm

23
Q

How big are coarse particles?
(Diamater - wise)
What are they sometimes referred to as?

A
  • Between 2500nm and 10000nm in diameter.
  • Sometimes referred to as “dust.”