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In the process of deepwater drilling, maintaining proper low-temperature rheological properties of oil-based drilling fluids and controlling the viscosity of clay dispersions in nonpolar solvents are of great importance. In this work, a dichain polyisobutylenesuccinimide with sufficient viscosity lowering performance was synthesized. The effects of polyisobutylenesuccinimide on low-temperature rheology...
Dispersion stability of organoclay (surfactant-modified montmorillonite) in nonpolar solvents can be dramatically improved by adding nonionic surfactants sorbitan monoleate (Span 80), sorbitan trioleate (Span 85) and 1-oleoyl-rac-glycerol (GMO). The effects of the surfactants on the basal spacing, size and surface potential of organoclay were investigated. The increase of the basal spacing of organoclay...
Fluorescent microcapsules doped with europium β-diketone complex were previously fabricated by stepwise adsorption of polyelectrolytes and europium complex using the layer-by-layer (LbL) technique [Chem. Commun. (2007) 1547–1549]. In this work, the influence of thermal treatment on the morphology of rare earth-doped microcapsules was studied by atomic force microscopy (AFM). Remarkable shrinking,...
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