Graphite Crystal Lattice Structure Model

SKU: 68788W

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This 120 carbon atom graphite molecular model kit can build 4 layers of 6 member hexagonal rings. Each layer has the appearance of a honeycomb lattice similar to interconnected aromatic hydrocarbons.

The covalent bonded carbon atom rings use 20mm bonds while inter-layer Van der Waals atoms are supported with 50mm bonds. Hold the top & bottom of the model & squeeze in opposite directions. You can show how the layers slide against other & how pencil lead works. Stiffer 10cm versions of these bonds can be used with trigonal atoms but to lesser effect.

Build as the more common alpha-hexagonal (above right) with ABAB layer stacking or the beta-rhombohedral (above left) ABCA layering. Details below.

Details

Click on graphite models to see all model versions including a glow in the dark version, graphene sheets & nanotobes.

The bonds lengths of this model are 20 & 50 mm which are a close approximation of 0.142 nm C-C sp2 trigonal hybridized covalent bond lengths within the graphene layer & the 0.335 nm distance between layers. The model does not show any explicit double bonds. It can also be reconfigured in the form of a carbon nanotube or a single graphene sheet.

The common understanding of graphite has graphene layers able to move due to the weak van der Waals attraction between them. However, TEM images have shown that graphene layers are often joined at the edges which can restrict this motion. See: The closed-edge structure of graphite and the effect of electrostatic charging.

 

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