Intrusion Fluid

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Intrusion Fluid

PoreXpert when opening experimental data files uses a material called the "Intrusion Fluid", the intrusion fluid is defined by the experimental data file you are opening and the properties of the intrusion fluid are then used for all of the algorithms that utilise the intrusion fluid. PoreXpert is set up to use Mercury as the default intrusion fluid.

 

If you are using water retention data or porometry data you need to make sure the intrusion fluid is correct for your sample. You can edit the intrusion fluid properties in the materials database browser.

 

The default parameters for the intrusion fluid (Mercury @ 20°C, atmospheric pressure) are:

 

Density - 13580 kg m-3

Surface (Interfacial) Tension - 0.485 N m-1

Advancing (Intrusion) contact angle - 140°

Receding (Extrusion) contact angle - 130°

 

The contact angles for mercury stated above are commonly used as defaults, but the contact angle differs depending on the materials being investigated. So it may be necessary to change it. A list of common contact angles is included below.

 

List of contact angles for mercury intrusion porosimetry

Material

Contact Angle (°)

Cement

125

Mica

126

Aluminium Oxide

127

Oxidised Surfaces

140

Zinc Oxide

141

Coal

124

Calcite

146

Paraffin Wax

149

Borosilicate Glass

153

Quartz

132 - 147

Glass

135 - 140

Clay

139 - 147

Titanium Dioxide

141 - 160