Dynamic Water Vapor Sorption

Fully automated analysis of moisture sorption isotherms using the dynamic vapour sorption (DVS) technique

Dynamic vapour sorption or DVS is a commonly used technique to determine the amount of water vapour which will be adsorbed by a material as a function of the relative humidity surrounding that sample. The technique involves very accurately measuring the weight of a sample after it has equilibrated at a range of relative humidities.

Type of studies possible with DVS technique:

water sorption isotherms of samples
kinetics of water uptake and release
hydration of materials
temperature-dependence of water sorption
irreversible changes mediated by adsorbed water
porosity of sample surfaces
effect of mixing compounds
effect of compacting powders
quality assurance testing for material conformity

The manufacture and protective packaging of many products relies on the information gained from dynamic vapour sorption (DVS) isotherms and the most common examples are:

Stability of pharmaceutical excipients and drug actives
Drying and storage of grains
Texture and shelf life of food products
PEM fuel cell components
Mortar, grout and other cementitious materials
Paper and coatings
Hydrophobic surface treatments
Microporous and nanostructured carbons

Vapour sorption experiments can be also performed using a manometric technique in Autosorb iQ equipped with a Vapour Module.

Review recent papers citing use of Quantachrome chemisorption scientific instruments:

TITLE: Phospholipid-Sepiolite Biomimetic Interfaces for the Immobilization of Enzymes
AUTHORS: Wicklein, Darder, Aranda and Ruiz-Hitzky - Instituto de Ciencia de Materiales de Madrid, Spain
INSTRUMENT: Aquadyne DVS
USAGE: sampling water adsorption isotherms at 25ºC, in the range of relative humidity between 0 and 95%
View paper

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Find out more about our range of dynamic water vapor sorption analyzers:
Aquadyne DVS