I have gypsum samples which I suspect have received heat treatment. Hence, the rate constants rendered in literature at room temperature may not apply to my samples. I need to come up with a more accurate value for my particular system.
Isothermal microcalorimetry is an excellent tool for studying reaction rates of gypsum and related materials. See link below the following quote:
"IMC is widely used for studying the rates of formation of a variety of materials by various processes. It is best suited to study processes which occur slowly—i.e. over hours or days. A prime example is the study of hydration and setting reactions of calcium mineral cement formulations. One paper provides an overview (Gawlicki, et al. 2010)[12] and another describes a simple approach (Evju 2003).[13] Other studies focus on insights into cement hydration provided by IMC combined with IR spectroscopy (Ylmen et al. 2010)[14] and on using IMC to study the influence of compositional variables on cement hydration and setting times (Xu et al. 2011).[15]
https://en.wikipedia.org/wiki/Isothermal_microcalorimetry#Solid_materials
You can also use TGA based methods (in which quantifying the change in the mass H2O in the tested material should be considered) to derive the rate constant(s). Essentially, mass change is the key for this method while reaction stoichiometry should be used for calculations.
It is possible that DSC or DTA techniques can give you an answer too.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials