caa a22 4500 388020326 CHVBK 20180307124922.0 cr unu---uuuuu 161130e199809 xx s 000 0 eng 10.1557/JMR.1998.0355 doi S088429140004591X pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0355 Systematic Study of Graphite Encapsulated Nickel Nanocrystal Synthesis with Formation Mechanism Implications [Elektronische Daten] By systematically varying the carbon content, chamber pressure, arc current, and blowing gas velocity in a tungsten-arc encapsulation setup, the effects of each of these variables on the encapsulation of nickel in graphite layers were observed. The data from these optimally designed experiments revealed that the properties of the arc translate into changes in the encapsulated product. Specifically, a larger, hotter arc results in more encapsulation in the final sample. These findings, along with evidence of graphite layers which have formed on precrystallized particles, indicate that the graphite layers may form by two sequential formation steps. The first step is the simple phase segregation of carbon from a cooling liquid particle, resulting in surface graphite. The second step is the growth of carbon on a crystallized nickel particle, regardless of the temperature at which this occurs. The proposed formation mechanism has significant implications for both a scientific understanding of the encapsulation phenomena, and possible commercial applications. Copyright © Materials Research Society 1998 Host Jonathon J. Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208 Dravid Vinayak P. Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208 Teng Mao-Hua Department of Geology, National Taiwan University, 245 Chou-Shan Road, Taipei, Taiwan, Republic of China Journal of Materials Research Cambridge University Press 13/9(1998-09), 2547-2555 0884-2914 13:9<2547 1998 13 JMR https://doi.org/10.1557/JMR.1998.0355 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0355 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Host Jonathon J. Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208 NATIONALLICENCE 700 1- Dravid Vinayak P. Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208 NATIONALLICENCE 700 1- Teng Mao-Hua Department of Geology, National Taiwan University, 245 Chou-Shan Road, Taipei, Taiwan, Republic of China NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/9(1998-09), 2547-2555 0884-2914 13:9<2547 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge