Nano World Learning Objectives

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What happens to the surface area when the radius of a particle is decreased by a factor of two?

It remains the same
It decreases
It quadruples
It doubles (correct)

How does crushing a 1cm particle into nanoparticles affect the surface area?

It remains constant
It halves
It decreases significantly
It increases thousands of times (correct)

In what way does particle size affect the color of gold particles?

Color remains constant regardless of size
Larger particles are darker in color
Smaller particles are darker in color (correct)
Particle size has no effect on color

What are some examples of different nano-architectures mentioned in the text?

Nanostar, Nanosponge, Nanorods, Nanowire (C) Signup and view all the answers

What leads to new properties in materials according to the text?

Decreasing size to the nano-scale (D) Signup and view all the answers

How can we visually represent nano-size materials?

By employing electron microscopes or scanning probe microscopes (D) Signup and view all the answers

What is the primary focus of Nanotechnology?

Creating new or improved products at extremely small scales (D) Signup and view all the answers

Which of the following correctly describes the nanometer scale?

1 - 100 nm (D) Signup and view all the answers

What is one of the key focuses when studying Nanotechnology?

Describing different nano-architectures based on sizes (C) Signup and view all the answers

Which statement accurately represents the role of nanomaterials in fighting COVID-19?

Nanomaterials are used for point-of-care diagnostics, carriers for therapeutics, and vaccine development (C) Signup and view all the answers

In what ways can nanotechnology benefit society?

Developing new treatment modalities for diseases (D) Signup and view all the answers

What makes the nanometer scale unique compared to macro scales?

Nanometer scale involves manipulating matter at extremely small scales, whereas macro scales deal with large scales of matter manipulation (B) Signup and view all the answers

What is the smallest object you can resolve with a regular optical microscope?

1000 - 2000 nm (B) Signup and view all the answers

Why do we need special microscopes to see nanoscale objects?

Particles on the nanoscale interact differently with light. (B) Signup and view all the answers

Which type of microscope uses a beam of electrons to visualize specimens?

Transmission electron microscope (D) Signup and view all the answers

What is the approximate size range of particles classified as nanoscale?

10 - 100 nm (C) Signup and view all the answers

Who should typically make decisions about the use of nanotechnologies?

A combination of experts, policymakers, and stakeholders (A) Signup and view all the answers

Should doctors use nanosilver catheters for infection prevention?

Yes, but only in specific cases (C) Signup and view all the answers

How much area would a teaspoon of paint cover if painted one nanometer thick?

The size of a football field (A) Signup and view all the answers

What percentage of Americans reported hearing 'nothing at all' about nanotechnology?

44% (C) Signup and view all the answers

How much have Americans heard about nanotechnology compared to previous years according to the National Science Board's Science and Engineering Indicators 2012?

Increased by 4 percentage points (D) Signup and view all the answers

Which field is NOT mentioned in the interdisciplinary endeavor related to nanoscience and nanotechnology?

Astronomy (A) Signup and view all the answers

Did scientists 'create' nano?

No, it was already in nature (A) Signup and view all the answers

What is one potential benefit of harnessing new behaviors at the nanometer scale?

Making new technologies (D) Signup and view all the answers

Surface area change with radius

When radius decreases by a factor of two, surface area doubles.

Crushing particles to nanoparticles

Crushing a 1cm particle into nanoparticles increases the surface area significantly.