Hollow glass microspheres coated from reactive graphene

A method of making graphene coated hollow glass microspheres comprising:

• providing Pristine Reactive Graphene Particles having an average particle size of from about 10 to about 500 nm and having an oxygen content of from about 0.5% to about 15% oxygen;
• providing hollow glass microspheres having an average diameter of from about 10 μm to 150 μm and a wall thickness of from about 0.5 μm to about 2 μm and having an external surface;
• Reacting either the hollow glass microspheres or the Pristine Reactive Graphene Particles with a silane coupling agent to provide reactive hollow glass microspheres or glass-reactive Pristine Reactive Graphene Particles;
• and
• mixing the Pristine Reactive Graphene Particles with the reactive hollow glass microspheres under conditions to associate the Pristine Reactive Graphene Particles on the external surface of the reactive hollow glass microspheres by chemical coupling with the silane coupling agent, or
• mixing the glass-reactive Pristine Reactive Graphene Particles with the hollow glass microspheres under conditions to associate the glass-reactive Pristine Reactive Graphene Particles on the external surface of the hollow glass microspheres by chemical coupling with the silane coupling agent to provide graphene coated hollow glass microspheres.