2015-05-042015-05-042012-05-22Tour, James M., Schmidt, Howard K., Lomeda, Jay R., Kosynkin, Dmitry V. and Doyle, Condell D., "Graphene compositions and drilling fluids derived therefrom." Patent US8183180B2. issued 2012-05-22. Retrieved from https://hdl.handle.net/1911/80091.https://hdl.handle.net/1911/80091Drilling fluids comprising graphenes and nanoplatelet additives and methods for production thereof are disclosed. Graphene includes graphite oxide, graphene oxide, chemically-converted graphene, and functionalized chemically-converted graphene. Derivatized graphenes and methods for production thereof are disclosed. The derivatized graphenes are prepared from a chemically-converted graphene through derivatization with a plurality of functional groups. Derivatization can be accomplished, for example, by reaction of a chemically-converted graphene with a diazonium species. Methods for preparation of graphite oxide are also disclosed.24 ppengUtility patentUS8183180B2