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Pure Appl. Chem., 2008, Vol. 80, No. 7, pp. 1365-1379

Monodisperse single nanodiamond particulates

Eiji Ōsawa

NanoCarbon Research Institute, AREC, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokita, Ueda, Nagano 386-8567, Japan

Abstract: Detonation nanodiamond (DN) was discovered in 1963, but for several reasons was known only among a small number of scientists until the turn of the century. The most serious cause was the fact that primary nanocarbon particles formed by the "bottom-up method" are in general covalently bound together under high-temperature and -pressure conditions to form large agglutinates, which were difficult to separate by conventional methods. DN was not an exception. A breakthrough led to the isolation of primary particles having the expected size of 4-5 nm by wet-milling with zirconia micro-beads. Thus, long-waited primary particles of DN finally became available in kg quantities in the form of colloidal sol, gel, and readily redispersible flakes. Progress in the development of a new form of the old material is presented.