Sol–Gel Transition in Nanodiamond Aqueous Dispersions by Small-Angle Scattering
| Autor: | Oleksandr I. Ivankov, Aleksandr E. Aleksenskii, Aleksandr Ya. Vul, Vasyl Ryukhtin, Leonid A. Bulavin, János Füzi, Oleksandr V. Tomchuk, Mikhail V. Avdeev, Vasil M. Garamus |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scattering Momentum transfer Synchrotron radiation 02 engineering and technology Neutron scattering 010402 general chemistry 021001 nanoscience & nanotechnology Detonation nanodiamond 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Chemical physics Physical and Theoretical Chemistry Small-angle scattering 0210 nano-technology Nanodiamond Sol-gel |
| Zdroj: | The Journal of Physical Chemistry C. 123:18028-18036 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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