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New functional materials based on magnetic liquids

Project Name

Hydrodynamic interaction effects in magnetic colloids


Leaderand Major Members

Artur Zakinyan – PhD (Physics & Mathematics); Associate Professor, Department of Generaland Theoretical Physics, Institute of Mathematics and Natural Sciences

Support Mechanisms

The project enjoyed supported based on the results of contest for grants (2019) from the Russian Research Foundation for initiative research by young scientists under the President’s program of research projects launched by leading researchers, including young scientists (Project Number: 19-72-00070)

Departments and Partners involved
Department of General and Theoretical Physics, Institute of Mathematics and Natural Sciences

Project Summary

The project is aimed at identifying and studying the fundamental role that hydrodynamic interactions have in complex liquids and colloidsystems, which can actively interact with external magnetic fields inducing the movement and structure development of dispersed particles in such media. This issue implies studying the behavior, structural evolution and transport of particles in states far from equilibrium of magnetic colloidal systems, where there is a specific joint manifestation of hydrodynamic and structural phenomena and processes. At the same time, the processes occurring at the micro-scale determine the regularities of the manifestation revealed nu a number of macroscopic properties of magnetic colloidal systems, the study of whichalso falls within the project scope of interest.

Current Outcomes

A computer model has been developed simulating the process of structure formation in an emulsion based on the Brownian dynamics algorithm in view of hydrodynamic interactions. Also, a model has been designed for calculating the macroscopic magnetic permeability of emulsions based on a finite-difference solution of the scalar magnetic potential distribution problem.

The effect focusing on the appearance of a torque in a limited volume of a magnetic colloid emulsion placed in a spherical container in a rotating field has been studied.

The hydrodynamic interaction of emulsion droplets with the boundaries of the spherical shell that causes the rotation effect, has been analyzed, and numerical models have been designed to describe the said processes. Namely, mobility matrices for such systems have been obtained, taking into account the hydrodynamic interactions of particles among themselves and with bounding surface of spherical geometry.

Theoutcomeshavebeenpublishedinajournal belonging to the Web of Science citation database; 1 official software registration certificate has been obtained.

  1. Electrical conductivity of field-structured emulsions Fluids. A.R. Zakinyan, L.M. Kulgina, A.A. Zakinyan, S.D. Turkin, 2020 г.

Expected outcomes

The project and its planned outcomesbelong to the intersection of dynamically developing modern research areas that cover the physics of magnetic colloidal systems and composite materials, as well as the hydrodynamics of multiphase media, which are currently within the focus the global research scientific community.

The project will offer a view at newer detailsregarding the physical properties and behavior patterns of composite materials as determined by dynamic structure formation.

The outcomes will serve a significant contribution to the progress of ideas concerning the properties and behavior patterns of colloidal composite materials and open up potential for successful development and creation of new intelligent controlled materials.New data will be obtained concerning the processes of structure formation in emulsions and the features of hydrodynamic interactions in them. New results will be obtained regarding the interactions of finite volumes of colloidal media, as well as individual colloidal particles and droplets with bounding surfaces.

The expected outcomes may be implemented in the development of microfluid and other technologies.

Potential Application

The developed technologies based on the obtained data may be applied in systems that require regulationof the materials properties – controlled electrical modules, exchange process control devices.The studied media and materials can be employed in medicine, in the development of specialequipment, as well as in microfluidics – an interdisciplinary field that focuses on managing small volumes of liquid media.