Low magnetic field induced capacitance changes in ferronematics

Jan Jadzyn; Martina Konerack\'a; Michal Raj\v{n}ak; Milan Timko; N\'andor \'Eber; Nat\'alia Toma\v{s}ovi\v{c}ov\'a; Peter Kop\v{c}ansk\'y; Tibor T\'oth-Katona; Xavier Chaud; Zuzana Mitr\'oov\'a

arxiv: 1401.1617 · v1 · pith:UV23MVLHnew · submitted 2014-01-08 · ❄️ cond-mat.soft · cond-mat.mtrl-sci

Low magnetic field induced capacitance changes in ferronematics

Nat\'alia Toma\v{s}ovi\v{c}ov\'a , Milan Timko , Zuzana Mitr\'oov\'a , Martina Konerack\'a , Michal Raj\v{n}ak , N\'andor \'Eber , Tibor T\'oth-Katona , Xavier Chaud

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Jan Jadzyn Peter Kop\v{c}ansk\'y

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classification ❄️ cond-mat.soft cond-mat.mtrl-sci

keywords magneticnanoparticlesswcntbeencapacitanceconcentrationfieldsfunctionalized

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The response in capacitance to low external magnetic fields (up to 0.1 T) of suspensions of spherical magnetic nanoparticles, single-wall carbon nanotubes (SWCNT), SWCNT functionalized with carboxyl group (SWCNT-COOH) and SWCNT functionalized with Fe$_3$O$_4$ nanoparticles in a nematic liquid crystal has been studied experimentally. The volume concentration of nanoparticles was $\phi_1$ = 10$^{-4}$ and $\phi_2$ = 10$^{-3}$. Independent of the type and the volume concentration of the nanoparticles, a linear response to low magnetic fields (far below the magnetic Fr\'eederiksz transition threshold) has been observed, which is not present in the undoped nematic.

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Low magnetic field induced capacitance changes in ferronematics

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