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Our instruments are ideal for studying molecular diffusion and sorption of molecules in porous materials

Many products in the filtration, drying, membrane and catalysts sector depend upon a detailed understanding of molecular diffusion and sorption phenomena. The gravimetric and chromatographic techniques pioneered by Surface Measurement Systems are powerful tools for studying such phenomena.

One of the most successful methods for determining the surface area of a solid is based on the BET method for gas adsorption. The adsorption method of Brunauer, Emmett and Teller (BET) is based on the physical adsorption of a vapour or gas onto the surface of a solid. Surface Measurement Systems have pioneered the use of both the DVS and the IGC methods for determining the surface area of solid state materials including catalysts and catalyst supports.

Application Note 18: Measuring BET Surface Areas using Organic Probe Molecules | Request a copy

Application Note 225: Isotherm Measurements for BET Surface Area Calculations using Inverse Gas Chromatography
| Request a copy

A key benefit of SMS instruments is that we routine study sorption phenomena is that not only can we use gaseous speciec, but we are specialists in using non gaseous species. Vapours such as water, hexane, ethanol and 30 other solvents are regularly used to characterise solid state catalysts using the DVS, the DVS-Vacuum and the SEA instruments, so are ideal research platforms for studying chemisorption phenomena.
The moisture sorption and desorption properties of many solid state materials, especially organic materials are critical for the characterisation of their drying and shelf life stability. In the past 10 years the DVS method invented by Surface Measurement Systems has become the standard laboratory method for studying drying and dehydration behaviour.

Application Note 50: An Overview of Dynamic and Gravimetric Vapour Sorption Vacuum System | Request a copy

Application Note 51: Gas Capture and Vapour Separation by Microporous Materials | Request a copy

Application Note 217: Titration of selective surface groups by pulse inverse gas chromatography | Request a copy

Application Note 222: The Determination of Surface Adsorption Potential Heterogeneity Profiles on Graphite by Inverse Gas Chromatography
| Request a copy

Particle adhesion can be a crucial issue for many porous material systems. A crucial factor in determining adhesion is the surface energy of the materials in question, be they fibre, particle or film. The surface energy of all these types of materials can be easily measured using Surface Measurement System’s unique Surface Energy Analyser.

Application Note 224: Surface Energetic Heterogeneity Profiles by iGC Surface Energy Analyzer | Request a copy

Application Note 226: Surface Energetic Heterogeneity of Carbon-based Nanomaterials | Request a copy

The moisture sorption properties of many solid state materials, especially organic materials are critical for the characterisation of their drying and shelf life stability. In the past 20 years the DVS method invented by Surface Measurement Systems has become the standard laboratory method for measuring water sorption isotherms.

Application Note 51: Gas Capture and Vapour Separation by Microporous Materials | Request a copy

Using BET adsorption isotherms obtained with a wide range of solutes, the porosity of materials can be determined using well established analyses. Unlike most other methods, SMS instruments can use organic molecules for determining the BET isotherms, not just nitrogen which is the traditional approach. The ability to use a wide range of species from hexane to decanol provides a much more insightful data on porosity especially for materials which are microporous.

Application Note 38: Determination of Mesopore Size Distribution by Organic Vapour Sorption | Request a copy

Studying molecular diffusion and permeability in nano and porous Materials is central to understanding and optimising their performance. The DVS and SEA instruments allows such phenomena to be studied using a wide range of probe molecules including water, organic solvents and gases, depending upon the specific SMS instrument used. SMS instruments are ideal for obtaining both kinetic and equilibrium information on molecular diffusion and permeability in a wide range of materials.

Application Note 16: Calculation of Diffusion Constants in Thin Polymer Films using DVS | Request a copy

Application Note 52: Vapour Permeability of Porous Materials using Payne Diffusion Cell | Request a copy

As well as our ability to perform single component gas and vapor sorption investigations, SMS has pioneered novel experimental methods which allow two component solute mixtures to be used, so that complex competitive adsorption phenomena can be studied.

Application Note 40: Using the DVS to Study the Water Sorption Properties of Multi-Component Systems | Request a copy

Direct determination of the equilibrium and kinetic sorption behavior of porous solids can be achieved using gravimetric DVS experiments.