Light scattering through the graphene oxide liquid crystal in a micro-channel

Area of Science:

• Materials Science
• Optics
• Fluid Dynamics

Background:

• Graphene oxide liquid crystals exhibit tunable functionality in the nematic phase.
• Understanding light interaction with these materials is key to characterizing their behavior.
• Microfluidic channels offer a controlled environment for studying material properties.

Purpose of the Study:

• To investigate light scattering by flowing graphene oxide liquid crystal flakes in a micro-channel.
• To characterize the tunable functionality of graphene oxide liquid crystal in the nematic phase.
• To establish a method for controlling flake orientation using light scattering.

Main Methods:

• Analyzing light scattering and transmission through a micro-channel.
• Pumping graphene oxide samples to induce flow and observe scattering changes.
• Utilizing theoretical models of light scattering cross-section, director vector, and dielectric tensor fluctuations.

Main Results:

• Pumping graphene oxide through a micro-channel increases scattered light amplitude.
• Time-averaged scattered light intensity correlates positively with increasing volume fraction.
• Higher volume fractions lead to faster saturation of normalized scattered intensity.

Conclusions:

• Light scattering analysis provides a method to determine flake orientation in graphene oxide liquid crystals.
• Flow dynamics in micro-channels can tune the optical properties of graphene oxide liquid crystals.
• This research offers a promising mechanical-hydrodynamical approach for controlling liquid crystal orientation.