Thixotropy of Aqueous Suspensions Containing Mg-AI Hydrotalcite-like Compound and Low-substituted Cationic Starch： Comparison between Oscillatory Shear and Thixotropic Loop Measurements.pdfVIP

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Thixotropy of Aqueous Suspensions Containing Mg-AI Hydrotalcite-like Compound and Low-substituted Cationic Starch： Comparison between Oscillatory Shear and Thixotropic Loop Measurements.pdf

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Thixotropy of Aqueous Suspensions Containing Mg-AI Hydrotalcite-like Compound and Low-substituted Cationic Starch： Comparison between Oscillatory Shear and Thixotropic Loop Measurements.pdf

FULLPAPER ThixotropyofAqueousSuspensionsContainingMg-AI Hydrotalcite—likeCompoundandLow—substituted CationicStarch：ComparisonbetweenOscillatory ShearandThixotropicLoopMeasurements Li，Yan柑(李燕) Bi，Haoyu。(毕浩宇) Shen，Shuanglong(申双龙) DepartmentofChemistry，ChangzhiCollege，Changzhi，Shanxi046011，China DepartmentofBiomedicineEngineering，ChangzhiMedicalCollege，Changzhi，Shanxi046000，China Therheologicalpropertiesofaqueoussuspensionsconsistingofpositivelychargedaluminum magnesium hy— drotalcite—likecompound(HTlc)andlow—substitutedcationicstrach(LCS)wereinvestigated．Specialemphasiswas placedon the thixotropic phenomenon．Thixotropicbehaviorwasinvestigated by two thixotropicmethods： thixotropicloopandoscillatoryshera measurements．LCSmoleculescouldbeadsorbedontoHTlcparticlesdueto htehydrogenbondingbetweenethergroupsorhydroxylgroupsofLCSandhydroxylgroupsofHTlc．Theelastic dynamic response of the HTlc／LCS suspension increased with increasing mass ratio )of HTlc and a three—dimensionalnetworkstructurecouldbeformedinthesuspensionwithhigherRvalue．Thethixotropictypeof theHTlc／LCS suspensiontransformedfrom negativetopositiveandthentocomplexthixotropywhenRchanged rfom 0to0．5．Bycomparingbetweenthethixotropicresultsobtainedbythixotropicloop and oscillatoryshera measurements，itwasvalidatedthatthethixotropicloop forthesuspensionshowingcomplexthixotropyhada crossoverpoint． Keywords colloids，thixotropy，layeredcompounds，hydrotalcite—likecompounds，low—substitutedcationicstarch Introduction smalloscillatoryshera stress(inthe