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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 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.
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 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 PoreMaster series consists of three automatic mercury intrusion porosimeters offering new concepts in automated pore size analysis.
PMI's BET Sorptometer accurately measures total surface area (via single and multi-point methods), adsorption and desorption isotherms, mean pore size, pore size distribution, pore volume, and pore structure. PMI's BET Sorptometer can assess a wide variety of samples, including powders and bulk solids, and can analyze both micropores and mesopores
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 PMI Capillary Flow Porometer provides fully automated through-pore analysis including bubble point, pore size distribution, mean flow pore size, hydro-head, integrity, and liquid, gas, Frazier, Gurley, and Rayl permeability. PMI's Capillary Flow Porometer is versatile -- it allows the user to test samples under compression, tension, or elevated temperature, thereby simulating operating conditions.
This is a unique instrument - capable of creating cakes in-situ on filtration media and characterizing pore structure characteristics of filtration media with and without cake. The cake is capable of being created under a wide range of test conditions. The instrument is used for cost effective analysis of cake filtration processes and development of appropriate technologie
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.
The PMI Mercury/Nonmercury Intrusion Porosimeter is a versatile and accurate instrument used to determine properties such as pore size distribution, total pore volume, surface area, and bulk and absolute densities of solid and powder samples.
The PMI Liquid-Liquid Porometer is designed for pore structure characterization of materials such as membranes, filter media, ceramics, paper, textile, etc., having very small pore sizes. It is capable of measuring pore diameters, pore distribution and liquid flow rates of materials having very low permeability.
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.
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 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.