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Chapter 2 + 3 (Theory) (Particles (Properties (Size, Shape, Surface…
Chapter 2 + 3 (Theory)
Additional Formulas
λ = (0.2898×10^-2 mK)/ T
Alternate Source of Energy: Quantum Dots in Solar Panel
Uses a doped semiconductor such as silicon or gallium arsenide.
Photon energy received has different range of band gap --> not all absorbed.
Many diff sized quantum dots --> cater to many different band gap --> absorb photons of wide spectrum --> increase panel efficiency.
Particles
Examples
Powders, granules
Suspension
Aerosol
Properties
Size
Shape
Surface Properties (eg.tension?)
Technical Properties
Charge Properties
Microstructure
Characterize to understand and control products
Methods of characterization / Material Analysis
Microscopes
Concept of Optical Vs Electron
Confocal Microsope
Detailed Video Explanation
Simplified Video
Higher Resolution with Same Size of view Sample
Used to analyse photon's interaction with nanostructure
Optical Microscope:
Classical (Eye Piece) vs Digital (Camera+Monitor)
Diffraction Techniques (X-ray or electron diffraction)
Spectroscopies
Electric and Magnetic Measurements (SQUID)
Mechanical Measurements (Hardness,strength)
Einstein's Photoelectric Effect
Light is not made of particles or wave, but of photons (Each individual photon's Energy = h*frequency)
High photon frequency --> High Photon Energy --> Causes metals like sodium to emit light
Red light of low frequency
cannot
cause sodium to emit electrons
Blue light of high frequency can cause sodium to emit electrons