TY - JOUR

T1 - Effects of pH and indifferent electrolyte concentration on the aggregate stability of detonation nanodiamond hydrosol

AU - Волкова, Анна Валериевна

AU - Белобородов, Андрей Александрович

AU - Водолажский, Виталий Александрович

AU - Голикова, Евгения Викторовна

AU - Ермакова, Людмила Эдуардовна

N1 - The work was supported by the Russian Science Foundation, project no. 23-23-00333. The authors are grateful to D.A. Aleksandrov for the measurements of the specific surface area. The study was carried out using the equipment of the Interdisciplinary Centre for Nanotechnology, the Centre for Optical and Laser Materials Research, the Centre for Physical Methods of Surface Investigation, and the Centre for X-ray Diffraction at the Research Park of St. Petersburg State University

PY - 2024/4/1

Y1 - 2024/4/1

N2 - Coagulation of polydisperse detonation nanodiamond (DND) hydrosol containing primary aggregates with a prevailing average size in a range of 20–200 nm has been studied experimentally and theoretically within the framework of the classical and extended DLVO theory as depending on the concentrations of an indifferent electrolyte (NaCl) and potential-determining ions (pH). It has been shown that the surface of DND particles is charged due to the ionization of amphoteric hydroxyl and acidic carboxyl groups located on it. The isoelectric point of the detonation nanodiamond particles has been found to correspond to pH 7.5. It has been revealed that the main stabilizing factor of the DND hydrosol is electrostatic. It has been shown that the stability and coagulation of the sol can be described within the framework of the extended DLVO theory using the effective constant for primary porous aggregates and taking into account the initial polydispersity of the DND particles

AB - Coagulation of polydisperse detonation nanodiamond (DND) hydrosol containing primary aggregates with a prevailing average size in a range of 20–200 nm has been studied experimentally and theoretically within the framework of the classical and extended DLVO theory as depending on the concentrations of an indifferent electrolyte (NaCl) and potential-determining ions (pH). It has been shown that the surface of DND particles is charged due to the ionization of amphoteric hydroxyl and acidic carboxyl groups located on it. The isoelectric point of the detonation nanodiamond particles has been found to correspond to pH 7.5. It has been revealed that the main stabilizing factor of the DND hydrosol is electrostatic. It has been shown that the stability and coagulation of the sol can be described within the framework of the extended DLVO theory using the effective constant for primary porous aggregates and taking into account the initial polydispersity of the DND particles

KW - detonation nanodiamond, polydisperse sol, aggregate stability, DLVO theory, effective Hamaker constant, water boundary layers, structural stabilization factor

KW - polydisperse sol

KW - aggregate stability

KW - DLVO theory

KW - effective Hamaker constant

KW - water boundary layers

KW - structural stabilization factor

KW - detonation nanodiamond

KW - polydisperse sol

KW - aggregate stability

KW - DLVO theory

KW - effective Hamaker constant

KW - water boundary layers

KW - structural stabilization factor

UR - https://www.mendeley.com/catalogue/87338c6d-23fe-3f0f-977e-2890beab5c22/

U2 - 10.1134/s1061933x23601282

DO - 10.1134/s1061933x23601282

M3 - Article

VL - 86

SP - 185

EP - 207

JO - Colloid Journal

JF - Colloid Journal

SN - 1061-933X

IS - 2

ER -