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Colloids in rotating electric and magnetic fields: designing tunable interactions with spatial field hodographs
Kirill A Komarov1, Stanislav O Yurchenko2
1Bauman Moscow State Technical University, 2nd Baumanskaya Street 5, 105005 Moscow, Russia. kirillkomarov1993@gmail.com st.yurchenko@mail.ru and Institute for High Pressure Physics RAS, Kaluzhskoe Shosse, 14, Troitsk, Moscow, 108840, Russia.
Soft Matter
|August 16, 2020
Summary
Researchers designed tunable interactions for colloidal particles using rotating fields. This unlocks new possibilities for soft materials and phase transition studies, offering control over particle behavior.
Area of Science:
- Soft matter physics
- Materials science
- Condensed matter physics
Background:
- Designing tunable interactions between colloidal particles is crucial for fundamental studies and engineering soft materials.
- Spatial hodographs, which map field magnitude and orientation, offer adjustable particle interactions but lack systematic study.
Purpose of the Study:
- To systematically investigate tunable interactions between spherical particles using various spatial hodographs (rhodonea, conical, cylindrical, ellipsoidal).
- To introduce and define "magic" compression and ellipticity for cylindrical and ellipsoidal hodographs.
Main Methods:
- Calculation of tunable interactions for spherical particles in different spatial hodographs.
- Introduction of "magic" compression and ellipticity parameters.
- Diagrammatic method and numerical calculations for many-body potentials.
Main Results:
- Spatial hodographs were found to be interconvertible, yielding diverse interactions like attraction, repulsion, and barrier-like forces.
- "Magic" hodographs exhibit spatially isotropic interactions with dispersion-force-like asymptotics.
- Physically meaningful fits for many-body tunable potentials were obtained for silica/iron oxide particles in deionized water under rotating electric/magnetic fields.
Conclusions:
- The study provides a comprehensive framework for designing tunable colloidal interactions.
- Results offer essential guidance for experiments and simulations of colloidal systems, impacting condensed matter, chemical physics, and materials science.
- The findings facilitate the engineering of colloidal liquids, crystals, gels, and glasses.
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