The role of colloidal stability in graphene oxide/nanoparticle hybrid synthesis Alex Massey , George Wilson and Dr Robert Menzel University of Leeds, UK Graphene oxide (GO) has been shown to be a useful additive or support to functional inorganic particles across a huge range of applications (for example: catalysis, energy storage and sensing). The resulting GO-particle hybrid materials often bring dramatic improvements to the particle's performance in terms of capacity, activity, stability and reusability, depending on the application. Some of these hybrid materials are now approaching commercialisation. Understanding the synthetic parameters that govern effective incorporation of GO into these particle systems will allow synthetic procedures to be tailored and developed effectively for large-scale batch manufacturing. One important consideration for the synthesis of GO-particle hybrids is the colloidal stability of both the GO and the functional particles during the synthesis. The colloidal stabilities of GO and the particles are strongly influenced by the synthetic conditions (for example pH and ionic strength) and plays a key role in determining the interactions between the two materials, meaning these conditions are critical in the synthesis of GO hybrids. Layered double hydroxides (LDHs) are a relevant example of functional nanoparticles that have applications in catalysis, energy storage and adsorption. This makes them an interesting model particle system to investigate the impact of colloidal stability on the synthesis of GO hybrid materials. References 1. DREYER, D.R., PARK, S., BIELAWSKI, C.W. AND RUOFF, R.S. The chemistry of graphene oxide. Chemical Society Reviews. 2010, 39(1), pp.228-240. 2. SIAMAKI, A.R., A.E.R.S. KHDER, V. ABDELSAYED, M.S. EL-SHALL and B.F. GUPTON. Microwave-assisted synthesis of palladium nanoparticles supported on graphene: A highly active and recyclable catalyst for carbon–carbon cross-coupling reactions. Journal of Catalysis, 2011, 279(1), pp.1-11. 3. ISRAELACHVILI, J.N. Chapter 13 - Van der Waals Forces between Particles and Surfaces. In: Israelachvili, J.N. ed. Intermolecular and Surface Forces (Third Edition). San Diego: Academic Press, 2011, pp.253-289. 4. GUDARZi, M.M. Colloidal Stability of Graphene Oxide: Aggregation in Two Dimensions. Langmuir. 2016, 32(20), pp.5058-5068.
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