Formation of self-organized nano- and micro-diamond rings

Autor:	J. Narayan, A. Bhaumik, S. Gupta, P. Joshi, P. Riley, R. J. Narayan
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	nanodiamond ring self-organized nanodiamonds q-carbon Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Materials Research Letters, Vol 9, Iss 7, Pp 300-307 (2021)
Druh dokumentu:	article
ISSN:	2166-3831 21663831
DOI:	10.1080/21663831.2021.1907627
Popis:	We report formation of self-organized nanodiamond ring structures due to dynamical heterogeneity in super undercooled carbon, created by nanosecond laser melting of amorphous carbon layers. We envisage that diamond tetrahedra self-organize and lead to formation of string and ring structures on which nanodiamonds nucleate and grow. Denser ring structures are formed in Q-carbon due to higher undercooling and enhanced diamond nucleation. The average size is larger under heterogeneous nucleation compared to homogeneous nucleation due to lower critical size and free energy, allowing more time for growth. With nanosecond laser melting, growth velocities range 5–10 ms−1 and even higher for Q-carbon.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/634c34eb3ced4f1e8a1b0b2500fb7d05 Zobrazit plný text záznamu View record in DOAJ