▎ 摘　　要

NOVELTY - Star type carboxylic acid based amphoteric surfactant (I) is new. USE - (I) is useful as graphene dispersant (claimed). ADVANTAGE - The dispersant: has improved hydration capacity and thermal stability. DETAILED DESCRIPTION - Star type carboxylic acid based amphoteric surfactant of formula (I) is new. A = 2,2'-(((bis(carboxylatomethyl)(methyl)ammonio)methyl)(2-carboxyethyl)ammonio)diacetate moiety of formula (II); and R1 = 12-18C long aliphatic chain. An INDEPENDENT CLAIM is also included for preparing (I).