NPCM LC

The initial orientation of LC director in a cell depends on

• applying voltage

• alignment layer properties

• electrode conductivity

• LC thickness

The ordering in liquid crystal can be characterized by

• The direction of the long molecular axes

• an order parameter

• the director in some point of LC layer

• angle between molecules long axis and electric field strength

Which LC properties depend on the order parameter (several options are possible)?

• Dielectric anisotropy

• elastic coefficients

• optical anisotropy

• ion density

Ionic impurities in NLC affect (several options are possible)

• dynamic viscosity

• dielectric anisotropy

• phase delay

• refractive index

If the addition of nanoparticles lead to the reduction of optical anisotropy, the value of phase delay ...

• will increase

• will decrease

• won't change

• do not depend on Δn

The relaxation process after removing the applied voltage happens due to

• elastic forces

• phase delay

• Electric field forces

• birefringence

Optical response time of LC depends on (several options are possible)…..

• applied electric voltage

• dielectric anisotropy

• optical anisotropy

• polarization of propagated light

Metal nanoparticles immersed in LC layer. During the experiment it was shown, that the reorientation of LC molecules led to the LSPR frequency shift. Why's that?

• the change of effective refractive index

• change of NP forms

• change of Drude friequency

• no correct answer

Usually, PL spectra of QD in LC much broader and red shifted in compare to the PL spectra of QD in toluene. Choose the possible explanation

• aggregation of QD

• chemical reaction with LC

• exciton-plasmon interaction

• no correct answer

All kind of nanoparticles tend to aggregate in LC due to

• LC elastic forces

• Coulomb's forces

• Ampere forces

• no correct answer