Magnetic segregation effect in liquid crystals doped with carbon nanotubes

• Danil A. Petrov,
• Pavel K. Skokov,
• Alexander N. Zakhlevnykh and
• Dmitriy V. Makarov

Beilstein J. Nanotechnol. 2019, 10, 1464–1474, doi:10.3762/bjnano.10.145

• , for real NLC–CNT suspensions, the condition σ > σm is fulfilled and an orientational transition from the planar to the angular phase occurs in the system, which is consistent with the experimental works [27][28][48]. The above estimates of dimensionless quantities (Equation 7) show that the parameter

• in an NLC doped with CNTs can be a transition of the first or the second order depending on the degree of segregation. In the case of weak magnetic segregation, the orientational transition is a second-order phase transition, like the Fréedericksz transition for pure LCs. At strong segregation, the

Optical orientation of nematic liquid crystal droplets via photoisomerization of an azodendrimer dopant

• Sergey A. Shvetsov,
• Alexander V. Emelyanenko,
• Natalia I. Boiko,
• Alexander S. Zolot'ko,
• Yan-Song Zhang,
• Jui-Hsiang Liu and
• Alexei R. Khokhlov

Beilstein J. Nanotechnol. 2018, 9, 870–879, doi:10.3762/bjnano.9.81

• rearrangement of their azobenzene moieties, which is the key point in the explanation of the observed effects. Keywords: dendrimer; droplets; nematic liquid crystal; orientational transition; photo-orientation; Introduction Azobenzene compounds represent a very convenient tool for the development of

• . The LED illumination with λmax = 398 nm causes a bipolar-to-radial orientational transition in NLC droplets due to the change in the boundary conditions from planar to homeotropic (Figure 2a,b). The same orientational structures were formed under light of λmax = 406 nm. The subsequent light

Magnetic field induced orientational transitions in liquid crystals doped with carbon nanotubes

• Danil A. Petrov,
• Pavel K. Skokov and
• Alexander N. Zakhlevnykh

Beilstein J. Nanotechnol. 2017, 8, 2807–2817, doi:10.3762/bjnano.8.280

• Equation 1) is transmitted to the LC matrix, and the first orientational transition from the initial planar phase to the non-uniform angular phase occurs at h = hc. The Fréedericksz transition threshold field, hc, appears to be smaller than that of the pure NLC. This result is in good agreement with

• possibility of changing the character of the orientational transition from the homeotropic to the angular phase, to which the field hr+ corresponds (see Figure 3). The Landau expansion of the free energy (Equation 4) in the vicinity of hr+ has the form Here Minimizing Equation 25 with respect to φm we obtain

Ferrocholesteric–ferronematic transitions induced by shear flow and magnetic field

• Dmitriy V. Makarov,
• Alexander A. Novikov and
• Alexander N. Zakhlevnykh

Beilstein J. Nanotechnol. 2017, 8, 2552–2561, doi:10.3762/bjnano.8.255

• the flow velocity u, when the ferrocholesteric helix is deformed (p/p0 > 1), the turn of the magnetic field corresponding to an increase in the angle φH, leads to a more effective influence of a field and a flow on the FC, unwinding the helix and causing the FC–FN orientational transition. The