Term: Brooks and Taylor structure
https://doi.org/10.1351/goldbook.B00747

Definition:
The structure of the anisotropic spheres which precipitate from isotropic pitch during pyrolysis. The structure of the spheres consists of a lamellar arrangement of aromatic molecules in parallel layers which are perpendicular to the polar axis of the sphere and which are perpendicular to the mesophase-isotropic phase interface.

Note: The term Brooks and Taylor structure is recommended to describe the particular lamellar @MT07285@ of the spherules most commonly precipitated from pyrolysed @P04677@. The term honours the workers who first recognized the significance of @C00822@ to carbon science and technology and who first defined this spherical @MT07285@. The term Brooks and Taylor structure does not cover all structures found in the spherical @M03849@, because other lamellar arrangements have been observed.

Related Terms:
1) morphology (http://doi.org/10.1351/goldbook.MT07285).
2) pitch (http://doi.org/10.1351/goldbook.P04677).
3) mesophase (http://doi.org/10.1351/goldbook.M03849).
4) isotropic (http://doi.org/10.1351/goldbook.I03353).
5) pyrolysis (http://doi.org/10.1351/goldbook.P04961).
6) interface (http://doi.org/10.1351/goldbook.I03082).
7) carbonaceous mesophase (http://doi.org/10.1351/goldbook.C00822).

Source: PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 478 (https://doi.org/10.1351/pac199567030473)

Citation: 'Brooks and Taylor structure' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.B00747

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