Unique rheological behavior of detonation nanodiamond hydrosols: The nature of sol-gel transition. (May 2020)

• Record Type: Journal Article
• Authors: Kuznetsov, Nikita M.; Belousov, Sergey I.; Bakirov, Artem V.; Chvalun, Sergei N.; Kamyshinsky, Roman A.; Mikhutkin, Alexey A.; Vasiliev, Alexander L.; Tolstoy, Peter M.; Mazur, Anton S.; Eidelman, Eugeny D.; Yudina, Elena B.; Vul, Alexander Ya
• Is Part Of: Carbon. Volume 161(2020)
• Page Start: 486
• Page End: 494
• Publication Date: 2020-05
• Subjects: Detonation nanodiamond -- Sol-gel transition -- Rheological properties -- Thixotropy -- Percolation threshold -- Hysteresis of viscosity; DND detonation nanodiamond -- 3ITT three-interval thixotropic tests -- NMR nuclear magnetic resonance -- SAXS small-angle X-ray scattering -- CryoTEM Cryo transmission electron microscopy -- CET Cryo-Electron Tomography; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2020.01.054
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: The paper describes the data on unusual rheological properties of detonation nanodiamonds (DND) hydrosols and presents the fractal model explaining such behavior. The hydrosols of DND with particles size of 4–5 nm and concentration range of 1.1–7.3 wt% with negative ( ζ < 0) and positive ( ζ > 0) electrokinetic potentials have been studied by rotational viscometry, small-angle X-ray scattering, nuclear magnetic resonance and Cryo Electron Tomography. Remarkable hysteresis of viscosity and thixotropic effect demonstrate the sol-gel transition at very low concentrations of the DND: 4–5 wt% for ζ > 0 and 5–6 wt% for ζ < 0. The transition is accompanied by increase of loss (viscosity) modulus by two orders of magnitude and the storage (elasticity) modulus started to be detected also. The experimental results have been explained in the frame of percolation theory based on the network formation due to faceted DND particles interactions. Graphical abstract: Image 1