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Pore size is usually stated in nanometers (nm) and micrometers (µm) and refers to the diameter of particles a membrane is likely to retain to a defined degree of efficiency.
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Equipment
The PoreMaster series consists of three automatic mercury intrusion porosimeters offering new concepts in automated pore size analysis.
The SA 3100 with automated dewar lift is a complete pore size and surface area anlysis system with integrated outgassing stations and vacuum pump and is highly accurate. It features continuous saturation pressure measurement, has a minimum manifold volume to enhance sensitivity, and performs a multipoint helium free space measurement, to improve repeatability and accuracy.
The POROMETERS 3G micro, 3G macro, 3Gz and 3Gzh are latest generation capillary flow porometers. Using the technique known as liquid expulsion, they measure pore size distributions and other related information of through-pores.
The NOVA e-Series of surface area analyzers offers a full line of rapid, high throughput B.E.T. surface area and pore size analyzers. Eight fully automatic models meet the needs of any research or quality assurance laboratory.
Permeation tubes are used for producing gas mixtures with exactly controlled composition. In principle, they are closed containers whose walls allow the substance in the container to permeate through with a temperature-dependent permeability rate.
The method of electroacoustics is presently available for determining mean pore size in a range of sample types without mercury, without pressurized gases, without vacuum pumps and without the wait.
The latest generation capillary flow pycnometers include the porometers 3G micro, 3G macro, 3Gz and 3Gzh. With the liquid expulsion technique pore size distributions and other related information are measured of through-pores in membranes and other filtration media.
The AutoPore V series porosimeters from Micromeritics are based on the mercury porosimetry analysis method, in which mercury is introduced into a porous structure under closely monitored pressures.
The Autosorb-iQ is a highly sophisticated gas sorption analyzer available with one or two physisorption analysis ports, both of which can be equipped for low pressure micropore analysis.
Micromeritics' AutoPore IV 9500 Series characterizes a material's porosity by applying various levels of pressure to a sample immersed in mercury. The pressure required to intrude mercury into the sample’s pores is inversely proportional to the size of the pores. This is called mercury porosimetry, or often, "mercury intrusion."
The InfraSORP is developed for users who have a high throughput of samples who want to judge their samples by high and low uptake capacity as an indication for the BET surface area and porosity in a short period of time.