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Effect of Liquid Crystalline Host on Structural Changes in Magnetosomes Based Ferronematics
Peter Bury1, Marek Veveričík1, František Černobila1
1Theoretical Department of Physics, FEIT, Žilina University, Univerzitná 1, 010 26 Žilina, Slovakia.
Nanomaterials (Basel, Switzerland)
|October 23, 2021
Summary
This study investigates how liquid crystals (LCs) with magnetosomes change under magnetic fields using surface acoustic waves (SAW). Doping LCs with magnetosomes alters their structural response and lowers the threshold magnetic field.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Magnetosomes, magnetic nanoparticles, can influence the properties of liquid crystals (LCs).
- Ferronematics, a field combining ferrimagnetic materials and nematic liquid crystals, offers unique responses to external fields.
- Understanding structural changes in LC-nanoparticle composites is crucial for developing novel functional materials.
Purpose of the Study:
- To investigate the effect of magnetosome nanoparticles on the structural behavior of nematic liquid crystals.
- To analyze the influence of magnetic and electric fields on surface acoustic wave (SAW) attenuation in doped LCs.
- To determine the changes in threshold magnetic fields and nematic-isotropic transition temperatures in magnetosome-doped LCs.
Main Methods:
- Surface acoustic wave (SAW) technique to measure attenuation response along the LC-piezoelectric substrate interface.
- Capacitance measurements to determine threshold magnetic fields of LCs and magnetosome-LC composites.
- Light transmission and temperature-dependent SAW attenuation measurements to study phase transitions and structural changes.
Main Results:
- Magnetosome doping in nematic LCs (5CB, 6CB, E7) resulted in distinct SAW attenuation responses under magnetic and electric fields compared to undoped LCs.
- A decrease in the threshold magnetic field was observed for magnetosome-doped LCs, confirmed by capacitance measurements.
- The nematic-isotropic transition temperature showed a shift in magnetosome-doped LCs, as indicated by SAW attenuation changes with temperature.
Conclusions:
- Magnetosomes significantly alter the structural dynamics and magnetic field response of nematic liquid crystals.
- The SAW technique, supported by capacitance and optical methods, effectively probes field-induced structural changes in these composites.
- The findings provide valuable insights into the behavior of ferronematic systems and their potential applications.
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