Fluorinated graphene dielectric films obtained from functionalized graphene suspension: preparation and properties.

In the present study, we have examined the interaction between a suspension of graphene in dimethylformamide and an aqueous solution of hydrofluoric acid, which was found to result in partial fluorination of suspension flakes. A considerable decrease in the thickness and lateral size of the graphene flakes (up to 1-5 monolayers in thickness and 100-300 nm in diameter) with increasing duration of fluorination treatment is found to be accompanied by a simultaneous transition of the flakes from the conducting to the insulating state. Smooth and uniform insulating films with a roughness of ∼2 nm and thicknesses down to 20 nm were deposited from the suspension on silicon.

[The effect of phenazepam on the pancreatic excretory function in thermal stress].

The excretory function of the pancreas was studied on albino rats during thermal stress and ACTH (corticotropine) administration. Stress inhibited the enzyme-synthesizing and enzyme-secreting functions of the gland. The tranquilizer phenazepam influencing the GABA-ergic brain systems exerted a protective effect on pancreatic exosecretion in stress and its strength depended on the administration regimen of the drug.