CHEE2945 – Lecture 1
Overview of course:
- First part of the course will be very small-scale interactions between particles.
- Second part will be much larger-scale interactions between larger and more
particles.
Assignment submission:
- Only one file allowed.
- MUST HAVE COVER SHEET.
- 10%-mark deduction per day, weekday or weekend.
Introduction to particles:
- A particle can be a small solid object, like a grain of sand (100 - 10 mm)
(module 2), a biological cell (typically 10 nm – 1 ) (module 1), or larger
boulders, etc.
What is a particle:
- Could be solid, like silica (SiO2) or haematite (Fe3O4).
- Could be liquid, like a droplet in air, or liquid in liquid (an emulsion).
- Could be a gaseous air bubble, like a single bubble in a liquid, or many
bubbles in liquid, with little liquid between them (a foam).
Surface to volume ratio:
- Consider a 333 cube. V = 27, SA = 54. If it were sliced into 3 331
objects, V = 27, but now SA = 90. If it were sliced into 27 111 objects, V =
27 but now SA = 162.
- With larger amounts of surface area, phenomena where surface area is
important become more pronounced. For example, if the solid was a catalyst
for a chemical reaction, increasing the surface area would make it more
effective.
- Surface area is important for emulsion stability.
Overview of course:
- First part of the course will be very small-scale interactions between particles.
- Second part will be much larger-scale interactions between larger and more
particles.
Assignment submission:
- Only one file allowed.
- MUST HAVE COVER SHEET.
- 10%-mark deduction per day, weekday or weekend.
Introduction to particles:
- A particle can be a small solid object, like a grain of sand (100 - 10 mm)
(module 2), a biological cell (typically 10 nm – 1 ) (module 1), or larger
boulders, etc.
What is a particle:
- Could be solid, like silica (SiO2) or haematite (Fe3O4).
- Could be liquid, like a droplet in air, or liquid in liquid (an emulsion).
- Could be a gaseous air bubble, like a single bubble in a liquid, or many
bubbles in liquid, with little liquid between them (a foam).
Surface to volume ratio:
- Consider a 333 cube. V = 27, SA = 54. If it were sliced into 3 331
objects, V = 27, but now SA = 90. If it were sliced into 27 111 objects, V =
27 but now SA = 162.
- With larger amounts of surface area, phenomena where surface area is
important become more pronounced. For example, if the solid was a catalyst
for a chemical reaction, increasing the surface area would make it more
effective.
- Surface area is important for emulsion stability.
