Publications by authors named "Colin J Willis"
A combination of and characterization techniques was used to determine the mechanism of calcium carbonate (CaCO) formation from calcium hydroxide (Ca(OH)) dispersions in methanol/water (CHOH/HO) systems. Mid-infrared (mid-IR) analysis shows that in the absence of carbon dioxide (CO) Ca(OH) establishes a reaction equilibrium with CHOH, forming calcium hydroxide methoxide (Ca(OH)(OCH)) and calcium methoxide (Ca(OCH)). Combined mid-IR, thermogravimetric analysis (TGA), X-ray diffraction (XRD), X-ray absorption spectroscopy and scanning electron microscopy examination of the reaction product formed in the presence of CO reveals the formation of calcium dimethylcarbonate (Ca(OCOOCH)).
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- A new process analytical technology system is introduced, combining a lab-scale reactor with a liquid-jet cell for real-time monitoring of complex synthesis processes through X-ray absorption spectroscopy (XAS).
- The system successfully tracked the preparation of sulfonate-stabilized CaCO particles while analyzing changes in calcium speciation as conditions varied over time.
- By quantitatively resolving composition changes in the synthesis process, this technology enhances our understanding of how process attributes relate to product quality and performance on a molecular level.