Tel: 01582 704807   |    Email: info@meritics.com   |   Signup to our newsletter

Pore Size/Volume Analysis

Pores are variations in the surfaces of solid samples that can range down to ultra-microporous scales. They can affect the permeability, absorptive and adsorptive characteristics of consolidated and powdered solids to varying degrees depending on the dimensions and shape of the surface void. This wide range of potential characteristics requires an extensive range of measuring techniques, which are typically characterised by the scale of the pores and the composition of the solid sample

Measurement of pores as low as 10 nm typically use intrusion of a non-wetting liquid such as mercury while larger pores are assessed using techniques such as capillary flow.


Porometry


i Pore is based on capillary flow porometry, where a non toxic wetting liquid is allowed to spontaneously fill the pores in the sample and a non reacting gas is allowed to displace liquid from pores. First the largest pores will get emptied, as they require lower pressure than smaller pores. As the pressure is increased, more and more smaller pores are progressively emptied. The pressure and flow rate of gas through the emptied pores provides the through pore distribution. The pressure at which through pores empty is inversely proportional to the pore size. Through pores are the pores connected from one side of material to the other side. i Pore capillary flow Porometer measures the pore throat diameter, which is the most constricted path of the entire pore. Bubble point, pore size distribution, pore flow distribution and density can all be calculated.

Contact us for a quote or to discuss your pore size analysis needs.
iPore



Porosimetry


Investigate the porous structure of solid samples quantitatively with mercury pore size analysis. Thermo Scientific™ Pascal Mercury Porosimeters provide reliable information about pore size/volume distribution, particle size distribution, bulk (envelope) density and specific surface for most porous solids using Pressurisation by Automatic Speed-up and Continuous Adjustment Logic, Pascal.Building on the success of the Pascal range, the new Pascal Evo features enhanced performance and additional software features. Two high pressure models are available together with a Macro pore unit or mercury filling device. Using the P.A.S.C.A.L pressurisation system. All modules feature this proprietary pressurisation procedure that automatically (and easily) determines the correct speed collecting data at the real equilibrium, without any need of expertise or previous knowledge of the sample.

A total of up to 20,000 pressure points can be measured on the intrusion and extrusion cycles on the Evo with increased pressure resolution. The instruments are fully controlled using the software which also allows for external control for maintenance and service issues.

Low cost of use is down to affordable sample chambers (dilatometers) which minimise mercury use, and the dilatometer is always in vertical position in any phase: degassing, mercury filling, low pressure experiment, high pressure experiment. This means that the hydrostatic pressure over the sample is always measured and used to correct the real pressure over the sample, this is particularly important especially at low pressures that is to say with macro and ultra-macroporous materials.

Contact us for a quote or to discuss your pore size analysis needs.
Pascal