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

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“…2-A), corresponding to 002 panels which are attributed to structural crystalline regions of aromatic layers [40]. The interlayer distance (d-spacing) is slight increased for the case of LNPT (.42Å) than the case of LNPE (3.9Å); while, the patterns of GO and CO are characterized by sharp peaks at about 9 degree that corresponding to 001 plane [41]. Another weak intense peak is located around 26.6 (002) and 44.5 degrees indicating that graphene oxide is not fully interconnected with oxygen atoms.…”

“…It is the oxygenated form of a monolayer graphene platelet, and the basal plane and the edge of graphene oxide decorated by hydrophilic surface functional groups (epoxide, hydroxy, and carboxyl groups) [21,22]. Due to its favoured properties (strong mechanical properties, optical properties, chemical functionalization capability, and extremely large surface area) it is considered best choice in preparation of carbon-based composites, paper, or thin lm [23][24][25]. In addition, carbon quantum dots (CQDs) offer unique properties and have great potential due to its advantageous characteristics of highly uorescent nature (optical properties), ease of functionalization with organic molecules and good stability.…”

Birefringent Graphene Oxide Liquid Crystals in Microchannel for Optical Switch

“…For this observation, when the GO concentration is sufficiently low, isolated flakes are the dominant form existing in the fluid, and flake-to-liquid is the dominant interactions. By increasing the concentration, the impact of the flake-to-flake interactions has increased which induce the GO flakes start to orient [18]. Increasing the alignment of flakes rise the order parameter of liquid crystals that leads to a growth the media birefringence [29].…”

“…In our early study, we investigated whether the orientation and ordering of GO nanoflakes can be manipulated by a mechanical-hydrodynamical approach including fluid flow in the microchannel . Surprisingly, it is observed that the transmitted and scattered intensity of light changed by controlling the flow rate due to the variation of the direction of flakes and birefringence.…”