The role of charge states in the self-organization of detonation nanodiamonds nanoparticles

• Published in: Diamond and related materials 2020-08, Vol.107, p.107903, Article 107903
• Main Authors: Vdovichenko, A.Yu, Kuznetsov, N.M., Shevchenko, V.G., Belousov, S.I., Yudina, E.B., Chvalun, S.N.
• Format: Article
• Language: English
• Subjects: Broadband; Detonation; Diamonds; Dielectrics; Nanoparticles; Nanostructure; Permittivity; Polydimethylsiloxane; Small angle X ray scattering
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2020.107903

The self-organization of detonation nanodiamond particles in dielectric liquid polydimethylsiloxane has been studied by broadband dielectric spectroscopy. Frequency dependences of the conductivity and the complex modulus of dielectric permittivity were measured. The structure of nanodiamond suspensions has been studied by small-angle X-ray scattering as well. Electrophysical properties of detonation nanodiamond suspensions, namely conductivity and permittivity, strongly depend on the particle surface chemistry. The temperature dependences show the activation nature of polarization processes. The model explaining observed effects has been proposed. [Display omitted] •Dielectric properties of suspensions DND with different terminal functional groups in PDMS were studied•Dielectric properties show non-uniform distribution of DND in PDMS media•DND with -CH surface groups form more extended clusters compared to DND with -COOH•Hierarchical structure organization of DNDs in PDMS observed by SAXS correlate with dielectric spectroscopy data