AI Article Synopsis
- Graphene oxide (GO) can form liquid crystalline (LC) phases in water, leading to various applications like papers, films, and foams, but effective production of long-range ordered graphene oxide liquid crystals (GOLCs) remains challenging.
- A new method was developed using a coat-hanger die to optimize the extrusion process, enhancing shear force on GO dispersions to produce highly ordered GOLCs at different concentrations.
- The resulting GO foam, created through a layer-by-layer approach, demonstrated improved conductivity compared to standard disordered GO foams after chemical reduction.
Article Abstract
Graphene oxide (GO) was discovered as a liquid crystalline (LC) phase formation in its water dispersion and expanded to a large number of applications, such as highly ordered GO sheets papers, films, and foams. However, there are still few efficient ways to prepare graphene oxide liquid crystals (GOLCs) with long-range highly ordered flakes. In this work, after carefully studying the rheological properties of GO aqueous dispersions at different concentrations, we have provided a new method to prepare holistically-oriented GOLCs through a designed coat-hanger die. Further, by simulating the extrusion process in the slot of the coat-hanger die, the die's dimensional sizes were optimized to apply efficient shear force on GO dispersions. Then, GOLCs with long-range highly ordered flakes of different GO concentrations were prepared using this method. Finally, a GO foam with a highly ordered structure was prepared using a layer-by-layer method, which exhibited improved conductivity compared to that of normal disordered GO foams after chemical reduction.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8698725 | PMC |
| http://dx.doi.org/10.1039/d1ra01241j | DOI Listing |
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