Search results for: E. V. Maltseva

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article

Aggregation of asphaltenes in the presence of dispersant S5A

E. V. Maltseva, A. M. Gorshkov, N. V. Yudina, Yu. V. Loskutova, more

Petroleum Chemistry > 2017 > 57 > 1 > 48-53

Aggregation of asphaltenes over time in the presence of dispersant S5A has been studied using photon correlation spectroscopy. The addition of the dispersant to toluene solutions of asphaltenes decreases the size of the aggregates, stabilizes their growth, and reduces the rate of aggregation for a considerably long time. The growth stabilization is achieved at the asphaltenes to dispersant ratio of...

article

Composition of fulvic acids after the mechanical activation of peats

A. A. Ivanov, E. V. Maltseva, N. V. Yudina

Solid Fuel Chemistry > 2016 > 50 > 1 > 7-11

It was found that a structural rearrangement related to a change in the amount of functional groups in the composition of fulvic acids occurred upon the mechanoactivation of peat: the amount of oxygen-containing groups and unsubstituted aliphatic structures increased. Carboxyl groups at the aromatic rings of fulvic acids are most reactive; this fact is responsible for their role in sorption and detoxification...

article

Interaction of Humic Acids with Organic Toxicants

O. N. Tchaikovskaya, N. V. Yudina, E. V. Maltseva, L. V. Nechaev, more

Russian Physics Journal > 2016 > 59 > 4 > 597-603

Interaction of humic acids with polyaromatic hydrocarbons (PAH) (naphthalene and anthracene) and triazole series fungicides (cyproconazole (CC) and tebuconazole (TC)) is investigated by the method of fluorescence quenching depending on the concentration of substances in solutions and their structural features. Humic acids were modified by mechanochemical activation in a planetary mill. The complex character of intermolecular interactions between PAH and fungicides with humic acids, including donor-acceptor and hydrophobic binding, is established. Thermodynamically stable conformations of biocide molecules were estimated using ChemOffice CS Chem3D 8.0 by methods of molecular mechanics (MM2) and molecular dynamics. Biocide molecules with pH 7 are in energetically favorable position when the benzene and triazole rings are almost parallel to each other. After acidification of solutions to pH 4.5, the CC molecule retains the geometry for which donor-acceptor interactions are possible: the benzene ring in the molecule represents the electron donor, and triazole is the acceptor. In this case, the electron density in CC is redistributed easier, which is explained by a smaller number of carbon atoms between the triazole and benzene rings, unlike TC. As a result, the TC triazole ring is protonated to a greater degree, acquiring a positive charge, and enters into donoracceptor interactions with humic acid (HA) samples. The above-indicated bond types allow HA to participate actively in sorption processes and to provide their interaction with biocides and PAH and hence, to act as detoxifying agents for recultivation of the polluted environment....

article

Conditions of gas hydrate formation in the Sea of Okhotsk

V. A. Akulichev, A. I. Obzhirov, R. B. Shakirov, E. V. Maltseva, more

Doklady Earth Sciences > 2014 > 454 > 1 > 94-96

Original Russian Text © V.A. Akulichev, A.I. Obzhirov, R.B. Shakirov, E.V. Maltseva, A.I. Gresov, Yu.A. Telegin, 2014, published in Doklady Akademii Nauk, 2014, Vol. 454, No. 3, pp. 340–342.

article

Comparative study of the fragment composition of humic acids isolated from caustobioliths and soil by the mechanochemical method

E. V. Maltseva, A. V. Savel’eva, A. A. Ivanov, N. V. Yudina, more

Russian Journal of Applied Chemistry > 2014 > 87 > 8 > 1070-1076

Fragment composition of humic acids isolated from solid caustobioliths of varied genesis and from soil was subjected to a comparative analysis. It was found that the composition of these humic acids is affected by the mechanochemical treatment conditions. It was shown that a mechanochemical treatment leads to a decrease in the molecular mass of humic acids to a varied extent for all caustobioliths...

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Search results for: E. V. Maltseva

Aggregation of asphaltenes in the presence of dispersant S5A

Composition of fulvic acids after the mechanical activation of peats

Interaction of Humic Acids with Organic Toxicants

Conditions of gas hydrate formation in the Sea of Okhotsk

Comparative study of the fragment composition of humic acids isolated from caustobioliths and soil by the mechanochemical method

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