Effect of Polyelectrolyte and Fatty Acid Soap on the Formation of CaCO3 in the Bulk and the Deposit on Hard Surfaces.
The effects of sodium polyacrylate (NaPAA) as well as potassium oleate on the nucleation and calcium carbonate crystal growth on hard surfaces, i.e., stainless steel and silica, have been investigated at different temperatures. The relation between the surface deposition and the corresponding bulk processes has been revealed by combining dynamic light scattering (DLS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and ellipsometry. The aim was to further our understanding of the crystal deposition/growth mechanism and how it can be controlled by the presence of polyelectrolytes (NaPAA) or soap (potassium oleate). The addition of polyelectrolytes (NaPAA) or soap (potassium oleate) decreases the size of CaCO3 particles in bulk solution and affects both crystal structure and morphology in the bulk as well as on hard surfaces. The amount of particles on hard surfaces decreases significantly in the presence of both potassium oleate and NaPAA. This was found to be a consequence of potassium oleate or NaPAA adsorption on the hard surface as well as on the CaCO3 crystal surfaces. Here, the polymer NaPAA exhibited a stronger inhibition effect on the formation and growth of CaCO3 particles than potassium oleate.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, Shanxi 030001, People's Republic of China.|Physical Chemistry, Department of Chemistry, Lund University , PO Box 124, SE-221 00 Lund, Sweden.
Hao
H
Wang
Physical Chemistry, Department of Chemistry, Lund University , PO Box 124, SE-221 00 Lund, Sweden.
Viveka
V
Alfredsson
BASF SE , 67056 Ludwigshafen, Germany.
Juergen
J
Tropsch
BASF SE , 67056 Ludwigshafen, Germany.
Roland
R
Ettl
Physical Chemistry, Department of Chemistry, Lund University , PO Box 124, SE-221 00 Lund, Sweden.
Tommy
T
Nylander
calcium carbonate crystallization; crystal deposition; crystal growth; potassium oleate; silica surface; sodium acrylate; stainless steel surface