Abstract
The influence of the anchoring forces on the Freedericksz transition in twisted ferronematics simultaneously subjected to magnetic and laser fields is studied in this work. Using the elastic continuum theory and Gouchen model for molecular anchoring on the cell support plates, the critical field and the saturation field were calculated as a function of the laser intensity and anchoring strength for two types of ferronematics based on 5CB and CCN-37 liquid crystals.
Highlights
Developed for the display industry as LCDs, where they seem to have reached their maximum potential, liquid crystals (LC) have been reinvented due to the discovery of nanomaterials leading to new systems such as QLED (Quantum dot display) or OLED (Organic led).These technologies are consequences of years of research into nanoparticle properties
We present the influence of boundary anchoring forces on the critical and saturation fields of magnetic Freedericksz transitions, considering the effect of the laser radiation used for observation
The value of the distortion angle depends on the field intensity: it tends to zero if the field magnitude is equal to the critical threshold for the Freedericksz transition, and it reaches its maximum value when the field intensity is equal to the saturation field
Summary
Developed for the display industry as LCDs, where they seem to have reached their maximum potential, liquid crystals (LC) have been reinvented due to the discovery of nanomaterials leading to new systems such as QLED (Quantum dot display) or OLED (Organic led). This has led to a loss of information regarding the parameters that are affected by the boundary conditions In this manuscript, we present the influence of boundary anchoring forces on the critical and saturation fields of magnetic Freedericksz transitions, considering the effect of the laser radiation used for observation. When a liquid crystal is subjected to external stimuli (such as electric magnetic or laser fields), a molecular reorientation occurs This is the Freedericksz transition, and the minimum value of the field intensity when this phenomenon appears is called the critical field. Where ξ is a parameter found by the authors to be −0.20 Considering this formula and Burylov’s theory for the interaction between the ferromagnetic nanoparticles and nematic host, critical and saturation fields were calculated and their dependencies of anchoring strength were plotted. As can be seen from this manuscript, the laser beam’s influence on these values can be significant if a high-intensity ray is used
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