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Analysis of Concentrated Graphene Dispersions

sep 17 2018

Graphene is a unique material with electromechanical properties which have sparked a revolution in the field of materials science. Although allotropic with carbon, graphene exhibits behavior between that of a metal and a non-metal. It can be described as a semiconductor like silicon, although with vastly improved electrical conductivity. This is because graphene is comprised of a single sheet of carbon-carbon bonds arranged in a two-dimensional lattice, representing a longer mean free path for electrons to travel through. Alongside these outstanding electrical properties, graphene is incredibly strong, lightweight, and formable – but these properties are difficult to reproduce.

Developing Graphene Dispersions

Graphene is still a novel material, the properties and characteristics of which are still subject to study. Multiple production methods involve applying graphene solutions to substrate materials and curing the liquid-solid matrix or allowing the solvent component to evaporate. This requires a thorough understanding of the behavior of graphene particles of varying sizes and volumetric concentrations. Measuring stability and dispersibility of graphene in dispersions is critical for assessing the reduction of graphite in a solvent or immiscible liquid. It is one of the most important parameters for characterizing the dispersive graphene particles in concentrated solutions with regards to their applicability.

This represents significant challenges to established particle analysis techniques such as Dynamic Light Scattering (DLS). Since particle dispersion needs to be strongly diluted, DLS is unsuitable for analysis of concentrated dispersions in their native state, a crucial metric for cutting-edge materials characterization.

Static Multiple Light Scattering (S-MLS) is preferable for analysis of sensitive or novel dispersions. It allows for the performance of purely-optical measurements in a dispersion without dilution or agitationg, allowing analysis of the sample’s real structure. This allows analysts to assess dispersed graphene particles in liquid media at high concentrations. It is also possible to determine the hydrodynamic diameter of graphene particles from their particle size, providing a robust assessment of their characteristics in solution.

Dispersion Analysis with Formulaction

Formulaction is an expert in the measurement of dispersive media for a range of industrial and commercial applications. If you would like to learn more about our Turbiscan® product range for physical stability and dispersion characterization, please review our Library and Application note section.

Please do not hesitate to contact us for any more information about graphene dispersion characterizations.

 

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