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Results of electrochemical anodic oxidation of multi-walled carbon nanotubes in 80% sulfuric acid are presented. Using X-ray diffraction analysis, electron microscopy, and Raman spectra, it has been proven that, as a result of anodic oxidation, partially unzipped multi-walled carbon nanotubes were obtained by anodic oxidation. It is shown that the degree of unzipping multi-walled carbon nanotubes depends on the time of electrochemical oxidation of these materials. Using the oxygen electrode as testing electrodes was shown the dependence of the electrochemical characteristics of these materials of the degree of unzipping the multi-walled carbon nanotubes. It is suggested that the controlled synthesis of partially unzipping nanotubes is possible. It is also suggested that it is possible to estimate the degree of unzipping the nanotube based on the study of the electrochemical characteristics of oxygen electrodes. By the electrochemical method obtained partially unzipped multi-walled carbon nanotubes which are promising electrode materials.

Colloidal solutions (*0.3 mol/L) of CdSe nanoparticles in xylene have been synthesized by the electrochemical method from an acid electrolyte based on HNO 3 ? HCl (2:1) mixture using extraction into xylene. It has been found that CdSe nanoparticles of small size (2-5 nm) synthesized on the cathode are readily extractable in xylene, whereas nanoparticles of larger size (20-100 nm) remain in the aqueous electrolyte and dissolve in the nitric-hydrochloric acids mixture. An X-ray phase analysis of powders of 2-5 nm CdSe nanoparticles showed them have a mixed cubic/hexagonal crystal structure. It has been found from measurements of absorption and photoluminescence spectra that the CdSe nanoparticles of this structure have a broad photoluminescence band (k max = 500 nm) at a narrow absorption peak (k max = 420 nm), which may be due to stacking fault formation in nanoparticles of mixed cubic/hexagonal structure. Using this electrolyte with a xylene surface layer under continuous electrolysis conditions and extraction of 2-5 nm CdSe nanoparticles with a content of up to 0.05 g in 1 cm 3 xylene (*0.3 mol/L) was obtained. Such colloidal solution can be used to obtain optical nanocomposites by incorporation CdSe nanoparticles into a liquidcrystalline cadmium caprylate matrix. The spectral characteristics such of composites have been studied by adsorption spectroscopy and fluorescence.

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