Bio & Natural Materials

Many natural materials are hydrophilic and have very strong affinity for moisture

 

Bio and natural materials tend to be hydrophilic in their chemical nature, thus containing significant amounts of water. They are thus very susceptible to humidity in the environment, and very low or indeed very high humidities can be detrimental to their performance. For example proteins can de-nature at low humidities whist the mechanical properties of biopolymers are significantly reduced at high humidities.

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 10 years the DVS method invented by Surface Measurement Systems has become the standard laboratory method for studying drying and dehydration behaviour.

pdficon_small Application Note 02: Moisture Sorption of EC Standard Reference Material RM 302 on a DVS-1 Instrument

Application Note 55: Measurement of Moisture Uptake Capacity in Human Hair Using Dynamic Vapour Sorption Technique
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Particle adhesion can be a crucial issue for many bio and natural materials applications. 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 210: Investigation of the Influence of Bleaching Conditions on Surface Properties of Standard Hair Samples by Inverse Gas Chromatography
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Application Note 220: The Characterisation of Cotton Fabrics and the Interaction with Perfume Molecules by Inverse Gas Chromatography
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Application Note 224: Surface Energetic Heterogeneity Profiles by iGC Surface Energy Analyzer | Request a copy

Amorphous materials all exhibit a glass transition temperature, and for hydrophilic materials these are highly sensitive to their moisture content. Both DVS and SEA instruments have proven to be very effective at studying the glass transition temperature of amorphous solids.

Application Note 35: Determining the Moisture-Induced Glass Transition in an Amorphous Pharmaceutical Material.
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pdficon_small Application Note 204: Determination of the glass transition temperatures Tg of maltose and its dependence on relative humidity by infinite dilution inverse gas chromatography

Bio-materials and natural materials tend to contain significant amounts of water in their native states. Therefore the diffusion and permeability of water through these materials can be critical for understanding their chemical and morphological structure as well as their performance. The DVS instruments are ideal for obtaining both kinetic and equilibrium information on diffusion and permeability in bio and natural materials.

Application Note 07: Measurement of Diffusion of Liquids and Vapours Through Real Polymer Tube Packaging Devices
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Application Note 16: Calculation of Diffusion Constants in Thin Polymer Films using DVS
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Application Note 52: Vapour Permeability of Porous Materials using Payne Diffusion Cell | Request a copy

Application Note 56: Measuring TEWL or Moisture Flux Across Artificial Skin | Request a copy

The moisture sorption properties of bio and natural materials are critical for their performance and utilisation. In the past 20 years the DVS method invented by Surface Measurement Systems has become the standard laboratory method for measuring water sorption isotherms.

pdficon_small Application Note 02: Moisture Sorption of EC Standard Reference Material RM 302 on a DVS-1 Instrument

Application Note 21: Moisture Sorption on Tobacco of Various Origins | Request a copy

Application Note 53: Moisture Sorption and Pore Collapse of Coals | Request a copy

Application Note 54: Detecting and Modelling Porosity in Natural and Engineered Materials | Request a copy

pdficon_small Application Note 57: Characterisation of Wheat Straw for Bio-fuel Application