TY - JOUR
T1 - Control of the zeta potential in semiconcentrated dispersions of titania in polar organic solvents
AU - Kosmulski, Marek
AU - Prochniak, Piotr
AU - Rosenholm, Jarl B.
PY - 2009/2
Y1 - 2009/2
N2 - The electrokinetic potential of commercial titania powder (chiefly anatase) in its 1-10 mass % dispersions in water, lower aliphatic alcohols, and dimethyl sulfoxide (DMSO) is positive, and rather insensitive to the nature of the solvent. The sign of the electrokinetic potential can be reversed to negative by addition of phosphoric acid, or of combination of phosphoric acid with triethylamine or with alkali hydroxide. The critical concentration of surface-active compounds, which induces a sign reversal, depends on the nature of the solvent, and it is higher in organic solvents than in water. The critical surface concentration of surface-active compounds for given organic solvent is rather insensitive to the solid-to-liquid ratio, and typically it is in the range of a few micromoles per square meter. © 2009 American Chemical Society.
AB - The electrokinetic potential of commercial titania powder (chiefly anatase) in its 1-10 mass % dispersions in water, lower aliphatic alcohols, and dimethyl sulfoxide (DMSO) is positive, and rather insensitive to the nature of the solvent. The sign of the electrokinetic potential can be reversed to negative by addition of phosphoric acid, or of combination of phosphoric acid with triethylamine or with alkali hydroxide. The critical concentration of surface-active compounds, which induces a sign reversal, depends on the nature of the solvent, and it is higher in organic solvents than in water. The critical surface concentration of surface-active compounds for given organic solvent is rather insensitive to the solid-to-liquid ratio, and typically it is in the range of a few micromoles per square meter. © 2009 American Chemical Society.
UR - https://www.mendeley.com/catalogue/da1ebe1a-aa67-313c-b8b1-69dff62b2165/
U2 - 10.1021/jp903845e
DO - 10.1021/jp903845e
M3 - Article
SN - 1932-7447
VL - 113
SP - 12806
EP - 12810
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 29
ER -