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Water pores in alkyl ketene dimer (AKD) dispersions studied by NMR diffusometry and optical microscopy

Kristina Mohlin (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; Niklas Lorén ; Magnus Nydén (Institutionen för kemi- och bioteknik ; SuMo Biomaterials)
Colloids and Surfaces A: Physicochemical and Engineering Aspects (0927-7757). Vol. 297 (2007), 1-3, p. 114-121.
[Artikel, refereegranskad vetenskaplig]

Water borne alkyl ketene dimer (AKD) dispersions have been investigated by means of optical microscopy and NMR diffusometry (NMR-D). In two different formulations, different amounts of entrapped water in pores with different sizes are obtained, which can be compared to a waterin-oil-in-water (w/o/w) dispersion. It is shown that the amount of entrapped water inside the AKD particles can conveniently be measured with the NMR-D technique. The pore size is however not obtained correctly from the NMR-D experiment. Due to the small size of the water pores, the pore size is underestimated when measured with NMR-D. This effect is investigated in more detail by Brownian dynamic simulations from which a correction factor is obtained that allows a more correct value of the pore size from NMR-D measurements. When the pore size is too small to be observed by optical microscopy, typically below 0.5 mu m, NMR diffusometry combined with Brownian dynamic simulations are shown to be a rapid and reliable tool for quantifying the porosity in these types of systems.

Nyckelord: pores, NMR diffusometry, alkyl ketene dimer, dispersion, optical, microscopy, Brownian dynamic simulations

Denna post skapades 2008-12-10. Senast ändrad 2017-01-27.
CPL Pubid: 80975


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
Institutionen för kemi- och bioteknik (2005-2014)
SuMo Biomaterials



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