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Organo-palygorskite (OPal) is a potential rheological additive in oil-based drilling fluids. This work aims to reveal the influences of surfactants on the structures and properties of OPal in oil-based drilling fluids. Firstly, palygorskite was organically modified by three quaternary ammonium salts with different lipophilicity. The crystal structures and morphologies of OPal samples were characterized...
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