Notley, Shannon2015-12-100743-7463http://hdl.handle.net/1885/67385Highly concentrated suspensions of graphene stabilized with surfactant were prepared using ultrasonic exfoliation. Concentrations of up to 1.5% w/w (15 mg/mL) were achieved through the continuous addition of the surfactant during the exfoliation process.Keywords: Addition method; Concentrated aqueous suspensions; Concentrated suspension; Efficient production; Exfoliation process; Graphene sheets; Interfacial areas; Liquid-vapor surfaces; Solid-liquid; Surface area; Adsorption; Graphene; Nonionic surfactants; Surfa201210.1021/la302750e2016-02-24