TY - JOUR

T1 - Coagulation of aqueous nanodisperse graphite suspensions in the presence of multivalent ions

AU - Petrov, M.P.

AU - Vezo, O.S.

AU - Trusov, A.A.

AU - Voitylov, A.V.

AU - Vojtylov, V.V.

N1 - M.P. Petrov, et al., Diamond & Related Materials, https://doi.org/10.1016/j.diamond.2019.107599

PY - 2020

Y1 - 2020

N2 - The results of the study of the coagulation kinetics of graphite nanoparticle suspensions in aqueous AlCl 3 and Th(NO 3) 4 electrolytes are presented. Electro-optical effects in disperse systems containing graphite particles allow to reliably investigate the coagulation kinetics in such systems. A method based on the analysis of changes of electro-optical effect relaxation dependencies in the process of coagulation was developed. The dependencies of the electrokinetic potential on the concentration of electrolytes are presented. Coagulation in such systems is observed if electrokinetic potential of graphite particles does not exceed 5 mV. At the isoelectric point, the fast coagulation theory is in good agreement with the observed processes of formation of aggregates from graphite particles. The conducted studies confirm the conclusion that the formation of aggregates from graphite particles with lyophobic surface is mainly influenced by the valence of the ions that determine the surface charge, and their other characteristics are of secondary importance.

AB - The results of the study of the coagulation kinetics of graphite nanoparticle suspensions in aqueous AlCl 3 and Th(NO 3) 4 electrolytes are presented. Electro-optical effects in disperse systems containing graphite particles allow to reliably investigate the coagulation kinetics in such systems. A method based on the analysis of changes of electro-optical effect relaxation dependencies in the process of coagulation was developed. The dependencies of the electrokinetic potential on the concentration of electrolytes are presented. Coagulation in such systems is observed if electrokinetic potential of graphite particles does not exceed 5 mV. At the isoelectric point, the fast coagulation theory is in good agreement with the observed processes of formation of aggregates from graphite particles. The conducted studies confirm the conclusion that the formation of aggregates from graphite particles with lyophobic surface is mainly influenced by the valence of the ions that determine the surface charge, and their other characteristics are of secondary importance.

KW - System dynamics

KW - Nanographite

KW - Coagulation

KW - Electrokinetic potential

KW - Electro-optical properties

KW - (D) System dynamics

KW - Coagulation

KW - Electro-optical properties

KW - Electrokinetic potential

KW - Nanographite

UR - http://www.scopus.com/inward/record.url?scp=85075384458&partnerID=8YFLogxK

U2 - 10.1016/j.diamond.2019.107599

DO - 10.1016/j.diamond.2019.107599

M3 - Article

VL - 101

JO - Diamond and Related Materials

JF - Diamond and Related Materials

SN - 0925-9635

M1 - 107599

ER -