Comparison of NMR Cryoporometry, Mercury Intrusion Porosimetry, and DSC Thermoporosimetry in Characterizing Pore Size Distributions of Compressed Finely Ground Calcium Carbonate Structures

摘要: This work investigates for the first time how mercury intrusion porosimetry (MIP), NMR-based cryoporometry, and DSC-based thermoporosimetry compare in revealing porous characteristics of ground calcium carbonate structures compacted over a range pressures. The comparison is made using same source samples throughout. MIP, much-used method characterization structures, has drawback that high pressure needed to intrude may either distort skeletal structure sample, especially when compressible materials such as cellulose or binders/latex are present, lead reduction measured number large pores due shielding by smaller pores. These effects have previously been addressed bulk modulus corrections modeling permeability account potential shielding. Cryoporometry gives detailed information about pore size distribution an imbibition saturated structure. Thermoporosimetry relatively new candidate this field, it yields both volume. Currently somewhat limited detectable, but relevant pigmented coatings. Its identified capturing involved progress before saturation reached.