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Dilution of nematic surface potentials: relaxation dynamics
1Dipartimento di Ingegneria Chimica, Universita di Napoli Federico II, Piazzale Tecchio 80, I-80125 Napoli, Italy.
We studied nematic liquid crystal relaxation dynamics using a surface potential dilution model. Results show relaxation speed depends on initial distortions, distinguishing between bulk-controlled or surface-controlled dynamics.
Area of Science:
- Soft Matter Physics
- Materials Science
- Surface Science
Background:
- Surface potentials influence the behavior of liquid crystals near interfaces.
- Understanding relaxation dynamics is crucial for applications involving liquid crystal alignment.
Purpose of the Study:
- To investigate the free relaxation of nematic liquid crystals on an anchoring surface after field removal.
- To model surface potentials as spatially diluted and compare with localized models.
- To estimate surface viscosity based on the extension length of surface torques.
Main Methods:
- Utilized a surface potential dilution model combined with Ericksen-Leslie theory.
- Analyzed the free relaxation dynamics of nematic liquid crystals.
- Compared simulation results from the dilution model with a localized surface potential model.
Main Results:
- Identified two distinct relaxation regimes: slow, bulk-controlled relaxation and fast, surface-controlled relaxation, dependent on initial distortions.
- The dilution model provides insights into the spatial extent of surface torques.
- Quantified surface viscosity in relation to the characteristic length of surface torque distribution.
Conclusions:
- The spatial distribution of surface potentials significantly impacts liquid crystal relaxation dynamics.
- The dilution model offers a valuable framework for understanding surface-bulk interactions in liquid crystals.
- This work provides a method to estimate surface viscosity, important for device performance.
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