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Questions and Answers
What is the typical size range for the nanoscale?
What is the typical size range for the nanoscale?
What is the size of a typical bacterium?
What is the size of a typical bacterium?
What is the size of a typical Carbon nanotube?
What is the size of a typical Carbon nanotube?
The 'quantum confinement effect' is a result of changes in the atomic structure.
The 'quantum confinement effect' is a result of changes in the atomic structure.
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Which of these is not an example of a quantum confined structure?
Which of these is not an example of a quantum confined structure?
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What type of material is used in quantum wells to create a "sandwich" structure?
What type of material is used in quantum wells to create a "sandwich" structure?
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What is a common example of a quantum wire?
What is a common example of a quantum wire?
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Quantum dots exhibit different colors due to quantum confinement.
Quantum dots exhibit different colors due to quantum confinement.
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Which of these is a property that makes nanoparticles special?
Which of these is a property that makes nanoparticles special?
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What is the term used to describe the phenomenon where a particle can pass through a potential barrier, even if its energy is lower than the barrier's energy?
What is the term used to describe the phenomenon where a particle can pass through a potential barrier, even if its energy is lower than the barrier's energy?
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What technique utilizes quantum tunneling to measure the surface of materials?
What technique utilizes quantum tunneling to measure the surface of materials?
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Study Notes
Nanotechnology
- Nanoparticles are generally 1-100 nm in size
- Nanoscale ranges from 1 to 1000 nm
- Particle size classification corresponds to different materials
Particle Size Classification
- 1 nm: Chemical drug
- 5 nm: Protein
- 10 nm: DNA
- 20-50 nm: Blood vessel pore
- 50 nm: Carbon nanotube
- 100-500 nm: Liposome nanoparticle
- 1000 nm (1 µm): Bacteria
- 10 µm: Cell
- 50 µm: Human hair
The Scale of Things - Nanometers and More
- Different scales of size, natural and man-made
- Includes various objects, from dust mites to human hair, and from gears to atoms
Titanium Dioxide Nano Powder
- Image of a white powder in a small, white bowl
Quantum Confinement Effect
- Quantum confinement effect happens when particle size is comparable with the electronic wave function
- Effects changes in the energy of electrons within a particle
- This phenomenon is known as the quantum size effect
Quantum Confinement Structures
- Quantum Confinement is described by quantum number
- Classification based on confinement dimension (Bulk, 2D sheet, 1D wire, and 0D dot)
Quantum Confinement and Particle Size
- Quantum confinement reduces as a particle's size increases.
- Decreasing size causes change in the bandgap, thus producing a blue shift in optical illumination.
Quantum Dots
- Quantum dots are semiconductors where excitons are confined in all three dimensions
- Quantum dots exhibit size-dependent properties
- Larger dots emit redder light while smaller dots emit bluer light.
- Quantum Dots are used to generate different colors
Tunnel Effect
- The transmission coefficient (T) is related to the particle's energy (E) and the potential barrier (V₀)
- Tunneling occurs even if the particle energy is less than the potential barrier
- The tunneling effect is described as having a finite probability
Tunneling Microscopy
- Tunneling Microscopy exploits the quantum effect of "barrier penetration" to measure a material's surface electron density
- The method uses tunneling voltage and distance control with scanning unit.
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Description
Explore the fascinating world of nanotechnology through this quiz, which covers topics like nanoparticles, particle size classification, and quantum confinement. Understand the various scales of natural and man-made objects at the nanoscale level. Test your knowledge about the properties and applications of nanomaterials.
