METHOD OF PRODUCING AN ELECTRICALLY CONDUCTIVE HYDROPHILIC AEROGEL BASED ON COMPOSITE OF GRAPHENE AND CARBON NANOTUBES

摘要

FIELD: electrical engineering.;SUBSTANCE: invention relates to the chemical, electrical industry, environmental protection and nanotechnology and can be used in the manufacture of elastic and flexible conductors, electroconductive polymer composite materials, sorbents, vibration- damping materials, batteries and super-capacitors. At the first step, colloidal graphene oxide is obtained, that first produces intermediate product 1 by acidizing the graphite flakes, filtering, washing, drying and high-temperature treatment of the precipitate for no more than 10 minutes by microwave radiation in a microwave oven with a bulk radiation density of not more than 0.1 W/cm³. Intermediate product powder 2 is then obtained by treating intermediate 1 with sulfuric acid, potassium persulfate and phosphoric anhydride, cooling, filtering, washing and drying the precipitate. Obtained intermediate 2 is treated with concentrated sulfuric acid at a reduced temperature. Potassium permanganate is added to the resulting suspension, the temperature is raised to room temperature, hydrogen peroxide is introduced. Resulting colloidal solution is washed, filtered or centrifuged. At the second stage, a hybrid hydrogel based on a composite of graphene and carbon nanotubes is prepared by mixing colloidal solutions of graphene oxide and carbon nanotubes in a volume ratio of not less than 12:1, adding an organic reductant – D-glucose and thermal processing of the resulting final mixture. At the third step, a hybrid hydrogel is lyophilized to produce an aerogel based on a composite of graphene and carbon nanotubes. Obtained aerogel is further treated with microwave radiation in a microwave oven. After the third stage, the hydrophilization step of the obtained aerogel is further carried out by treating it with a boiling mixed dilute solution containing 3–9 % nitric acid and 0.5–1.5 % hydrogen peroxide, with a T:Z ratio of 1:70 to 1:50 for 10–20 minutes.;EFFECT: obtained aerogel along with the electrical conductivity has hydrophilicity, has a narrow pore size distribution, and is obtained in a safe manner.;5 cl, 3 dwg, 1 tbl, 4 ex