SynthesisandThermotropicLiquidCrystallinePropertiesofHeterogeminiSurfactantsContainingaQuaternaryAmmoniumandaHydroxylGroup，周天华，赵剑曦，Ahomologousseriesofnovelheterogeminisurfactants,(N,N-Dimethyl-N-[3-(alkyloxy)-2-hydroxypropyl]-alkylammoniumbromide(referredtoasCmOhpNCn;