Nadezhda S. Sukhinina

A novel sorbent for lanthanide adsorption based on tetraoctyldiglycolamide, modified carbon inverse opals

Carbon inverse opals (C-IOP) were noncovalently modified with tetraoctyldiglycolamide (TODGA). The effect of HNO3 concentration in the aqueous phase and that of the TODGA concentration in the sorbent phase on the adsorption of microquantities of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu nitrates from HNO3 solutions by CIOP modified with TODGA was considered. The stoichiometry of the sorbed complexes has been determined by the slope analysis method. The efficiency of lanthanides(III) adsorption from moderate-concentration HNO3 solutions increases with increasing atomic number of the element. The process of lanthanides(III) adsorption is exothermic, spontaneous and followed a pseudo-second-order kinetic model.

DIRECT OBSERVATION OF THE SHELL-LIKE STRUCTURE OF SiO 2 PARTICLES SYNTHESIZED BY THE MULTISTAGE ST € OBER METHOD

Ultramicrotomy was used to prepare a cross-section of shell-like amorphous SiO2 spherical particle synthesized by the multistage Stober method which allowed performing first direct observations of the hierarchical structure of the SiO2 particle by transmission and scanning electron microscopy. The presence of primary, secondary and tertiary particles forming the inner structure of SiO2 spheres was established. The use of the small angle scattering of neutrons and synchrotron radiation techniques has enabled to define the size of the primary particles, the fractal parameters of their surface and the bulk density of the SiO2 spheres.

C-IOP/NiO/Ni7S6 composite with the inverse opal lattice as an electrode for supercapacitors

In this work, we demonstrate the results of studies on the synthesis, the structure and properties of carbon inverted opal (C-IOP) nanostructures, the surface of which is modified by oxide and sulfide of nickel. It is shown that the modification of the matrix C-IOP by nickel compounds led to a decreasing the specific surface area more than three times and was 250 m2/g. The specific capacitance of the capacitor with the C-IOP/NiO/Ni7S6 composite as electrode has increased more than 4 times, from 130 F/g to 600 F/g, as compared with the sample C-IOP without the modification by nickel compounds. The significant contribution of the faradaic reactions in specific capacitance of the capacitor electrodes of the composites is marked.

Synthesis, Structure, and Electrochemical Characteristics of Carbon Inverse Opals

Carbon structures with inverse opal lattice modified with nickel compounds are synthesized. The thermal treatment effect on phase composition of compounds is studied. The electrochemical characteristics of carbon structures as electrode materials in supercapacitors are measured for samples obtained from various organic precursors. A considerable contribution of Faraday reactions to the specific capacitance of a capacitor with composite-based electrodes is mentioned.

A novel way of synthesising C8 cubic carbon nanocrystals

We synthesized C8 nanocrystals (NCs) by carbonization and deposition of anthracene vapors onto various substrates. C8 nanocrystals have a bcc lattice with cell parameter a = (4.08 ± 0.02) A. A hypothesis is proposed on the possibility of C8 NC formation in the vapor phase and was confirmed in the experiment.

Synthesis and Modification of Carbon Inverse Opal Nanostructres Based on Anthracene and Their Electrochemical Characteristics

Carbon structures with the inverse opal lattice modified with nickel compounds have been synthesized by the template method. The carbon precursor is anthracene, whose molecule has a planar structure consisting of three benzene rings. The resulting nanostructures are characterized by X-ray diffraction, scanning and high-resolution transmission electron spectroscopy, and gas adsorption–desorption. Electrochemical characteristics of composites being used as the electrode material are measured.