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1. Welcome to our presentation

2. Presentation topic
Determination of porosity by mercury
injection porosinete

3. Sample Characteristics
Pore size is about 500 um and diameter
3.5nm
Time duration is 30min.
Pore size should be open space.

4. Mercury Porosimetry Provide us:
•Pore size distribution.
•Total pore volume.
•Skeletal of pore.
•Apparent density.
•Sample specific surface area.

5. Main Key parameters:
 Pore shape.
Cylindrical pore geometry.

6. Theatrical Parameters:
•Young Laplace equation.
•Pressure: Air vs. Oil.
•Volume of pore.
•Surface Tension.
•The contact angle.

7. Sample preparation
Unambiguous sample.
High pressure system .
Hydraulic fluid (minimum 450Mpa).
Low pressure system.
Remove air and moisture.
Sample weights
Removed water and chemical properties.
Using low vacuum pressure.

8. Time /Pressure measurement:
•100s are needed to pass
3cm when radious .5
micrometer.

9. How fast the system data equilibrate:

10. Data interpretation and analysis
Pore size and pore volume .
Washburn equation .
SEM.
Density.
Surface area .
Rootara and Prenzlo equation.
Connected with surface area and pressure.
Particle size.
Two possible method .
Related two surface area.

11. Hysteresis
Related to intrusion and
extrusion.
Several explanation are
proposed .
Contact angle Hysteresis.
Ink bottle theory.

12. Contact angle hysteresis.
Volume changes should not be observed.
Questionable process.
After the process actual contact angle could
not approved.

13. Ink bottle theory:
When pore smaller than it
can measure .
Not actual cavity.

14. Network simulation software
(P.Mathews and his workers)
10*10*10 ARRAY OF CUBES.
3D network.
Data calculation in overall case.
10*10*10 matrix in pore.

15. Limitations
•Measures largest entrance but not inner actual
size.
•Can not be used for analyzing closed pore.

16. Conculation
Determine largest pore size not actual.
smallest pore need for maximum pressure.