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Sol–Gel Transition in Nanodiamond Aqueous Dispersions by Small-Angle Scattering
- Tomchuk, Oleksandr V., Avdeev, Mikhail V., Aleksenskii, Aleksandr E., Vul, Aleksandr Ya., Ivankov, Oleksandr I., Ryukhtin, Vasyl V., Füzi, János, Garamus, Vasil M., Bulavin, Leonid A.
- Journal of physical chemistry 2019 v.123 no.29 pp. 18028-18036
- X-radiation, dispersions, distillates, hydrogels, momentum, nanodiamonds, neutron diffraction, neutrons, physical chemistry
- This paper reports the results of the comparative structural characterization of detonation nanodiamond particles and their aggregates in hydrosols and hydrogels by small-angle scattering (SAS) techniques. The data from different neutron and X-ray (synchrotron radiation) diffractometers cover a wide range of momentum transfer and show multilevel structure organizations at the size scale from 1 to 1000 nm and higher. For this purpose, in addition to the conventional SAS techniques the methods of very small-angle and ultrasmall-angle neutron scattering were applied. The fraction of nanodiamond particles in the aggregates is determined. A complex two-step mechanism of nanodiamond cluster association into a network during the sol–gel transition is revealed. It is assumed that a reason for the reversibility of this process is a different compactness of the corresponding structural levels defined by different fractal organizations.