研究目的
To investigate the response of a nematic liquid crystal (NLC) undergoing a Poiseuille flow in the Stokes regime, while being illuminated by a laser beam incident perpendicular to the flow direction, focusing on the emergence, shape, and location of regions of enhanced biaxiality due to the interaction between the material, flow, and optical fields.
研究成果
The study demonstrates that the combined effect of flow and optical torque in a nematic liquid crystal leads to the emergence of regions of biaxiality. The relative strength of viscous and optical torques mediates the flow-induced response of these regions, influencing their shape and location. This mechanistic framework provides insights into the anisotropic interactions in optofluidic applications based on material-flow-light interactions.
研究不足
The study is limited by the computational cost of simulating large systems over long times to achieve steady-state nonequilibrium conditions. Additionally, the model laser's dimensions and the temperature increase due to the laser are idealized, which may not fully represent experimental conditions.
1：Experimental Design and Method Selection:
Nonequilibrium molecular dynamics (NEMD) simulations were performed to study the anisotropic interaction between a nematic liquid crystal (NLC), flow, and optical fields. The simulations adopted a minimalistic model accounting for local heating and optical torque exerted by a laser beam.
2：Sample Selection and Data Sources:
The system consisted of N ≈ 15,600 mesogens confined between two planar solid substrates, with the simulation cell dimensions sx = 100.0, sy = 8.0 ? 9.0, and sz = 24.0 in the x-, y-, and z-directions, respectively.
3：0, sy = 0 ? 0, and sz = 0 in the x-, y-, and z-directions, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The interaction potential included an isotropic soft-sphere potential and an anisotropic contribution derived from dispersion interactions. The system was exposed to an external body force Fe to establish a steady laminar flow and a model laser beam for local heating and optical torque.
4：Experimental Procedures and Operational Workflow:
The system was equilibrated in the isothermal-isobaric ensemble before turning on the flow and laser. A steady-state nonequilibrium situation was reached, and averages were collected over 2.0 × 10^6 time steps.
5：0 × 10^6 time steps.
Data Analysis Methods:
5. Data Analysis Methods: The local alignment tensor Q, nematic order parameter S, biaxiality order parameter ξ, and orientation distribution function (odf) were computed to analyze the system's response to the combined effects of flow and optical torque.
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