Abstract
Distorted colloidal crystal suspension of similar-sized aggregates of diamonds (1.5 μm in diameter) was obtained by the deionization of aqueous suspension of the pre-particles of diamond, 4 nm in diameter. The stability, characteristics, and the rigidity of the crystal-like suspensions were studied. The main cause for the formation of the similar-sized aggregates is deduced to be the cooperation between the van de Waals inter-particle attraction and the repulsion induced by the vigorous thermal motion of the pre-particles. The rigidity was evaluated from the microscopic observation in the sedimentation equilibrium. Fluctuation parameters of the distorted colloidal crystals estimated from the rigidities were between 0.03 and 0.06, which are quite similar to those of typical colloidal crystals and solids of hard spheres.
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Acknowledgments
Dr. Kinya Goto of Bando Chemical Ind., Ltd (Kobe, Japan) is thanked for his kind providing the suspension of the nano-sized pre-particles of diamond by the courtesy of Professor Takashi Nishino of Kobe University. Professor Dr. Akira Tsuchida is greatly appreciated for his ELS measurements and useful comments during this work. Mr. Akihiro Katsuno of Gifu University is acknowledged for his TEM measurements of the pre-particles of diamond. Financial supports from the Ministry of Education, Culture, Sports, Science and Technology, Japan for Exploratory Research and those for Scientific Research (B) from Japan Society for the Promotion of Science are greatly acknowledged during his stay in Yamagata University as a Guest Professor. The research funds from AMX Co. (Tokyo) are also appreciated deeply. Lastly, the author appreciates valuable comments offered from the reviewers.
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Okubo, T. Distorted colloidal crystal of similar-sized aggregates (1.5 μm in diameter) of nano-sized diamond particles (4 nm in diameter). Colloid Polym Sci 291, 1623–1629 (2013). https://doi.org/10.1007/s00396-013-2896-y
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DOI: https://doi.org/10.1007/s00396-013-2896-y