NANO-DIAMOND ORGANIC SOLVENT DISPERSION PRODUCTION METHOD AND NANO-DIAMOND ORGANIC SOLVENT DISPERSION

摘要

The nano-diamond (ND) organic solvent dispersion production method according to the present invention comprises a mixing step (S6) and a solvent substitution step (S7). In the mixing step (S6), an ND aqueous dispersion and an organic solvent are mixed. The ND aqueous dispersion used in the mixing step (S6) contains ND particles of a negative zeta potential, and has an electric conductance of at most 120 μS/cm per 1 mass% of solid content. In the solvent substitution step (S7), a solvent substitution operation is performed so as to evaporate water from the liquid mixture obtained in the mixing step (S6). Such a production method is suitable for obtaining a nano-diamond organic solvent solution in which nano-diamond particles having a negative zeta potential are dispersed, while inhibiting aggregation of said nano-diamond particles. The ND organic solvent dispersion according to the present invention has a haze value of at most 1% as determined by haze measurement under a condition in which the solid content is 2 mass% and the light path length is 1 mm.