Dynamic vapor sorption
Dynamic vapor sorption (DVS) is a gravimetric method for measuring how much and how quickly the analyzed material absorbs vapor. The analysis can be used to evaluate the material's performance in high-moisture conditions.
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What is DVS analysis used for?
DVS is used to measure the vapor sorption characteristics of a variety of sample types, including pharmaceuticals, cosmetics, and other consumer products. It can, for example, be used to test how foods interact with moisture, which can affect their shelf life. DVS also has applications in the development of construction materials, as it can be used to monitor how humidity impacts their physical characteristics.
How does dynamic vapor sorption work?
During dynamic vapor sorption analysis, the sample is placed onto an ultra-accurate mass balance in a controlled environment. The humidity of the sample chamber is increased gradually, for example, in 5% steps from 0% relative humidity (RH) to 95% RH. As the sample absorbs the solvent, its mass will increase, which is measured by the balance. After the maximum humidity has been reached, the process can be reversed to see how the mass changes with decreasing humidity. The resulting graph will yield information on the absorption and desorption characteristics of the sample.
The principle of DVS is similar to that of thermogravimetric analysis (TGA), which is used to measure changes in mass as a result of temperature change. The key difference is the use of relative humidity as the independent variable, while the temperature is generally kept constant.
Suitable samples and sample preparation
DVS is carried out on solid sample matter, typically in powdered form. Common sample materials include biomass powders, cement, pharmaceuticals, cosmetics, and powdered food ingredients. The sample may need to be dried before the experiment is commenced. Care should be taken to ensure that drying does not alter the material’s properties.
Advantages and limitations of DVS analysis
The carrier gas setup of DVS increases the rate at which the sample is exposed to moisture and therefore significantly increases the speed at which testing can be carried out. The required sample quantity is also much smaller when compared with traditional methods.
DVS results can, however, be very sensitive to changes in temperature and the existing moisture content of the sample material.
Suitable sample matrices
- Powders
- Food products
- Pharmaceuticals
- Polymers
Ideal uses of dynamic vapor sorption
- Measuring sorption characteristics
- Monitoring how humidity affects materials
- Quality control testing
- Shelf life testing
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Frequently asked questions
DVS is used to assess the effects of humidity on material properties in several industries, including construction materials, food, and pharmaceuticals.
Measurlabs offers a variety of laboratory analyses for product developers and quality managers. We perform some of the analyses in our own lab, but mostly we outsource them to carefully selected partner laboratories. This way we can send each sample to the lab that is best suited for the purpose, and offer high-quality analyses with more than a thousand different methods to our clients.
When you contact us through our contact form or by email, one of our specialists will take ownership of your case and answer your query. You get an offer with all the necessary details about the analysis, and can send your samples to the indicated address. We will then take care of sending your samples to the correct laboratories and write a clear report on the results for you.
Samples are usually delivered to our laboratory via courier. Contact us for further details before sending samples.