TY - JOUR

T1 - On the calculation of particle electrokinetic potential in detonation nanodiamond dispersions

AU - Волкова, Анна Валериевна

AU - Ермакова, Людмила Эдуардовна

AU - Чуйков, Никита Сергеевич

N1 - This work was supported by the Russian Science Foundation, project no. 23-23-00333. The authors are grateful to D.A. Aleksandrov for the measurement of the specific surface areas. The study was performed using the equipment of the Interdisciplinary Resource Center for Nanotechnology at the Research Park, St. Petersburg State University.

PY - 2025/4/9

Y1 - 2025/4/9

N2 - The applicability of various approximations of the electrophoresis theory to calculating the electrokinetic potentials in real nanodisperse systems has been estimated by the example of aqueous polydispersed thermooxidized detonation nanodiamond sols containing nanoparticle aggregates as depending onthe concentration and pH of background electrolyte (NaCl) solutions. It has been found that, at low potentials |ζW| < 25 mV calculated for primary particles within the framework of the Wiersema model, allowance for particle aggregation and aggregate porosity has almost no effect on the electrokinetic potential. In the range of |ζW| = 25−50 mV, the most reliable values of the electrokinetic potentials of the aggregates can, seemingly, be obtained using the Miller equation for ion-conducting particles taking into account their real porosities,provided that the potential is constant. At |ζW| > 50 mV, knowing the real sizes of the aggregates, the Overbeek equation with the Oshima analytical expressions for the f3(κr) and f4(κr) functions can be used to calculate the electrokinetic potentials under the assumption that the aggregates are monolithic.

AB - The applicability of various approximations of the electrophoresis theory to calculating the electrokinetic potentials in real nanodisperse systems has been estimated by the example of aqueous polydispersed thermooxidized detonation nanodiamond sols containing nanoparticle aggregates as depending onthe concentration and pH of background electrolyte (NaCl) solutions. It has been found that, at low potentials |ζW| < 25 mV calculated for primary particles within the framework of the Wiersema model, allowance for particle aggregation and aggregate porosity has almost no effect on the electrokinetic potential. In the range of |ζW| = 25−50 mV, the most reliable values of the electrokinetic potentials of the aggregates can, seemingly, be obtained using the Miller equation for ion-conducting particles taking into account their real porosities,provided that the potential is constant. At |ζW| > 50 mV, knowing the real sizes of the aggregates, the Overbeek equation with the Oshima analytical expressions for the f3(κr) and f4(κr) functions can be used to calculate the electrokinetic potentials under the assumption that the aggregates are monolithic.

KW - detonation nanodiamond

KW - primary nanoparticle

KW - aggregate

KW - electrophoretic mobility

KW - electrokinetic potential

KW - electrophoresis theory

KW - aggregate

KW - detonation nanodiamond

KW - electrokinetic potential

KW - electrophoresis theory

KW - electrophoretic mobility

KW - primary nanoparticle

UR - https://www.mendeley.com/catalogue/65de427c-4fd6-3c8e-bbb9-537479f7324b/

U2 - 10.1134/s1061933x24601306

DO - 10.1134/s1061933x24601306

M3 - Article

VL - 87

SP - 201

EP - 211

JO - Colloid Journal

JF - Colloid Journal

SN - 1061-933X

IS - 2

ER -