Thermodynamic discontinuity in evaporating thin solvated nematics

Area of Science:

• Materials Science
• Soft Matter Physics
• Nanotechnology

Background:

• Nematic liquid crystals (NLCs) exhibit complex molecular sensitivities crucial for sensing and optoelectronics.
• Controlled self-organization of NLC patterns in thin films has been a significant challenge.

Purpose of the Study:

• To investigate the molecular-scale mechanisms governing dewetting and pattern formation in solvated NLC thin films.
• To develop a unified multi-scale framework for understanding and controlling solvent evaporation-induced nano/microfabrications.

Main Methods:

• Molecular-scale investigation of solvated thin NLC films.
• Development of a continuum-scale theory for solvated anisotropic systems.
• Comparison of theoretical predictions with experimental observations.

Main Results:

• Concurrent discontinuities in thermodynamic properties, mobility, and rheology of NLCs induce spontaneous dewetting.
• Solvent molecules create an entropic landscape, enabling pattern formation absent in pure NLC films.
• The developed continuum framework accurately predicts pattern length scales.

Conclusions:

• Solvent-induced discontinuities are essential for controlled self-organized pattern evolution in NLC films.
• The established multi-scale framework provides a unified approach for solvent evaporation-induced nano/microfabrications.
• This research overcomes challenges in achieving controlled NLC self-organization.