Preparation of Tritium-Labeled Hyaluronic Acid by Tritium Thermal Activation Method

Radiochemistry - The principal possibility for preparing tritiated hyaluronic acid by the thermal activation method is demonstrated. The influence exerted by the conditions of preparing substances...     

Adsorption of alkyltrimethylammonium bromides on nanodiamonds

Abstract

Adsorption of alkyltrimethylammonium bromides (DTAB, TTAB and CTAB) on detonation nanodiamonds was studied. Nanodiamonds of positive and negative zeta potentials in aqueous suspensions were used. The amount of the compound on nanodiamond surface was determined using tritium labeled surfactants. Our results suggested the same mechanism of the adsorption complex formation for nanodiamonds of total positive and negative charge.     

Relation Between the Group Hydrocarbon Composition and Octane Characteristics of Narrow Fractions of Catalytically Cracked Hydrotreated Gasoline

Chemistry and Technology of Fuels and Oils - In this paper the possibility of using narrow fractions of catalytically cracked hydrotreated gasoline with a relatively low octane number in catalytic...     

A study of structural transformations of asphaltene molecules during hydroconversion of vacuum residue at various temperatures in the presence of nanosized molybdenum disulfide particles

Elemental analysis, molecular mass, and ¹H NMR data are presented for vacuum residue asphaltenes and the products of vacuum residue hydroconversion in the presence of nanosized MoS₂ catalyst particles obtained “in situ” in the hydrocarbon medium. Structural group analysis of average asphaltene molecules has been performed and their structural units have been described. The main trends of change in the structural parameters of the molecules under the hydroconversion conditions and the effect of temperature on the character of these changes have been revealed.