There are two types of spherically centred structures in PoreXpert.

 

Small Centred Structures

A small centred structure is a material which has a central spherical zone of small pores contained within larger pores and throats. This kind of structure can represent microporosity contained within the larger macroporosity. An example of a small centred structure is shown in the next figure.

 

Figure showing a central zone of small pores. The unit cell also shows a wetting calculation for a different solid phase material selected using the materials database.

 

 

Large Centred Structures

An example structure with a central zone of large pores is shown in the next figure. This structure is ideal if you have a material with large pores in the centre of the material but the intrusion fluid cannot access the large pores before passing through an outer layer of small pores. A material that has this kind of structure is a medicine tablet. The medicine tablet is typically coated with a thin layer and this thin layer has small pores while the tablet inside has a larger pore structure.

 

Figure showing a central zone of large pores.