Magnetorheology of Dimorphic Fluids: The Case of Nanotubes-Microspheres System

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Magnetorheology of Dimorphic Fluids: The Case of Nanotubes-Microspheres System

Popis výsledku v původním jazyce

Conductive polypyrrole (PPy) nanotubes were synthesized with a two-step one-day synthesis. During synthesis, the tubes were decorated with magnetite at different concentrations granting them magnetic properties. A dimorphic magnetorheological fluid (MRF) was prepared by mixing the composite polypyrrole nanotubes/magnetite nanoparticles with commercial carbonyl iron spherical microparticles in silicone oil. The rheological properties of the dimorphic system were studied under the presence of magnetic field at room and elevated temperature. An enhancement of the MR effect with the presence of the nanotubes was observed when compared with a standard MRF consisted only of magnetic microparticles. Due to the faster magnetic saturation of the nanotubes this enhancement is exceptionally high at lower magnetic fields. In real applications, these systems often operated at elevated temperatures during which the dispersions containing the nanotubes show higher efficiencies. The stability of the system is studied under dynamic conditions where it is revealed that the nanotubes keep the standard particles well dispersed with the sedimentation improving by more than 50 %.

Název v anglickém jazyce

Magnetorheology of Dimorphic Fluids: The Case of Nanotubes-Microspheres System

Popis výsledku anglicky

Conductive polypyrrole (PPy) nanotubes were synthesized with a two-step one-day synthesis. During synthesis, the tubes were decorated with magnetite at different concentrations granting them magnetic properties. A dimorphic magnetorheological fluid (MRF) was prepared by mixing the composite polypyrrole nanotubes/magnetite nanoparticles with commercial carbonyl iron spherical microparticles in silicone oil. The rheological properties of the dimorphic system were studied under the presence of magnetic field at room and elevated temperature. An enhancement of the MR effect with the presence of the nanotubes was observed when compared with a standard MRF consisted only of magnetic microparticles. Due to the faster magnetic saturation of the nanotubes this enhancement is exceptionally high at lower magnetic fields. In real applications, these systems often operated at elevated temperatures during which the dispersions containing the nanotubes show higher efficiencies. The stability of the system is studied under dynamic conditions where it is revealed that the nanotubes keep the standard particles well dispersed with the sedimentation improving by more than 50 %.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20301 - Mechanical engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů