Physico-Chemical nanomaterials science

Influence of nanostructured biocolloid processes on rheological properties of various iron aluminosilicates
Panko A.V.1, Kovzun I.G.1, Prokopenko V.A.1,2, Nikipelova O.M.3, 
Tsyganovich О.А.1,2, Oliinyk V.O.1
1 F.D.Ovcharenko Institute of biocolloid chemistry of NAS of Ukraine, 
Ak.Vernadskogo Blvd. 42, Kyiv 03680, Ukraine. E-mail: gr.k.ibcc@ukr.net
2 National technical University of Ukraine «KPI», 
Peremohy Ave., 37, building 4, Kyiv 03056, Ukraine. 
3 SA «Ukrainian Research Institute of Medical Rehabilitation and Balneology, Ministry of Health of Ukraine», Lermontovskiy Lane 6, Odessa 65014, Ukraine.

The influence of colloidal and biocolloidal processes on rheological properties of iron aluminosilicates was investigated. It was theoretically and experimentally shown, that they have an essential influence on the occurrence of stress and catastrophic phenomena in sediments on slopes of seas and oceans, and in soils of artificial dams. With the help of laws of physicochemical geomechanics (PCGM), the causes and mechanisms of deformation of dispersions and sediments in conditions of stress phenomena were revealed.
It is noted, that the discussed processes and phenomena start at mechanical stress values where elastoplastic deformation of dispersions and sediments begins. Under the influence of gravitational and physicochemical factors, the elastic deformation turns into the ultraanomalous one, and then into the hyperanomalous plastic flow (laminar processes of shearing). Further growth of mechanical stress leads to a gradual transition from laminar to turbulent flow through the dilatant, rheopectic and thixotropic stages, which ends with an avalanche-like stress shift of huge masses of sediments and soils. Sea sediments, reaching the bottom of the seas and oceans, congeal in an inverse way, according to their rheological properties. It was for the first time shown that such phenomena are being controlled by contact nanostructural interactions in dispersions caused by colloidal, nanochemical, geomechanical, and biocolloidal processes. Features of mechanisms of destruction of artificial dams are considered.

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