Study Set Content:
he science and technology of small particles
Micromeritics –
Categories of properties:
Fundamental properties
Derived properties
inherit in all individual particles.
Fundamental properties
dependent on the fundamental properties.
Derived properties
Fundamental properties –
a. Particle size and shape
b. Particle size distribution
c. Surface area
Derived properties
a. Porosity
b. Density
c. Flow properties
d. Packing arrangement or Bulkiness
> 1000 um
Coarse
50 - 1000 um
Conventional
1 - 50 um
Fine
< 0.1 um
Ultra Fine
0.1 – 1 um
Very Fine
use of microscopy to measure individual particles
Optical Microscopy
Optical microscopy
1um – mm
Electron microscopy
0.001u-
An emulsion or suspension, diluted or undiluted, is mounted on a slide or ruled cell and placed on a mechanical stage.
Optical Microscopy
individual particles can be seen. Advantage or Disadvantage
Advantages
the diameter obtained from only two dimensions of particles (length and breadth).
Disadvantages
Polar measurements:
Ferett diameter
Martin diameter
Projected area of the circle
distance between two tangents on opposite sides of the particles
Ferett diameter
diameter of the circle that well enclose the particle.
Projected area of the circle
