Effect of poly(vinyl)pyrrolidone on the zeta potential and water loss of raw and Na‐rich Saudi bentonite

Abstract

The influence of poly (vinyl) pyrrolidone (PVP) adsorption on the zeta potential and water loss of raw Saudi bentonite (B) and Na-rich Saudi bentonite (Na-B) suspensions was investigated. Phase analysis of raw Saudi bentonite was characterized by XRD, and chemical analysis was investigated by XRF. Adsorption study was performed by patch technique. The zeta potential and water loss of B and Na-B suspensions were measured at different PVP concentrations. PVP adsorption on B was fitted by Freundlich model. For Na-B, the adsorption isotherm closely fitted the Langmuir model and showed a higher affinity and greater adsorbed amount of PVP than B. Before addition of PVP the zeta potentials of B and Na-B suspensions were −30 and −41 mV, respectively. In presence of PVP the zeta potential of raw bentonite suspension decreased, then increased with increasing PVP concentration; the reverse trend was observed in the case of Na-B suspension. The presence of PVP greatly influenced the water loss of B dispersion but had a slight effect in the case of Na-B.

Novel Acrylamide/2-Acrylamide-2-methylpropanesulfonic Acid/4-Vinylpyridine Terpolymer as an Anti-calcium Contamination Fluid-Loss Additive for Water-Based Drilling Fluids

“…The absolute value of ζ potential of Mt/PAAV is greater than that of Mt/PAA in the whole pH range investigated, which indicates a better dispersion stability performance of PAAV for Mt particles in aqueous solution. Additionally, when the pH value decreases from 9.1 to 4.0, the decline in the absolute value of ζ potential is not as sharp in Mt/PAAV (from −65.4 to −51.3 mV) as in Mt/PAA (from −60.3 to −38.9 mV), which may be explained by the higher adsorption capacity of PAAV on the Mt surface …”

“…Additionally, when the pH value decreases 3 to −38.9 mV), which may be explained by the higher adsorption capacity of PAAV on the Mt surface. 37 As shown in Figure 9, a significant decrease of the ζ potential for each suspension system can be observed in the presence of CaCl 2 . The degree of changes in the ζ potential of Mt particles could be predicted by the double layer theory, which predicts that increasing the electrolyte concentration suppresses the electric double layer thicknesses.…”

Mechanical Properties, Morphological Characterization and Melt Dripping Studies of Polypropylene (PP) + High Density Polyethylene (HDPE) + Polystyrene (PS) Ternary Polymer Blends: Non-Isothermal Degradation Kinetics of Compatibilized and Uncompatibilized Blends

“…This can be due to the addition of amorphous natured compatibilizers into the crystalline matrix. The percentage crystallinity was decrease 42% and 31% increase in the amorphous nature was observed upon compatibilizer addition [20].…”