Electrophoresis of Spherical Particles with a Random Distribution of Zeta Potential or Surface Charge

Oriented Adhesion of Escherichia coli to Polystyrene Particles

“…Importantly, this relationship does not depend upon any particular model for interparticle forces. In order to interpret our experiments, we chose an a value The fact that bacteria adhere by one end indicated that the bacteria were perhaps nonuniformly charged, and so we used the technique of rotational electrophoresis to measure the charge nonuniformity on the bacterial surfaces (16,17,49). The essence of this technique is that particles that are uniformly charged do not rotate by electrophoresis, regardless of shape (34).…”

“…The essence of this technique is that particles that are uniformly charged do not rotate by electrophoresis, regardless of shape (34). However, nonuniformly charged particles will rotate by electrophoresis, and we have recently developed the experimental and theoretical tools with which to measure and interpret charge nonuniformity (16,17,49). Thus, if we see a bacterium rotating in an applied electric field, we know that this bacterium is nonuniformly charged, and we can interpret the angular velocity in terms of a standard deviation of potential over the bacterial surface.…”

Boundary effects on electrophoresis of a colloidal cylinder with a nonuniform zeta potential distribution

“…It was found that, in terms of the multipole moments of the zeta potential, the electrophoretic mobility depends not only on the monopole moment (area-averaged zeta potential) but also on the quadrupole moment, and the dipole moment contributes to particle rotation which tends to align the particle with the electric field. This analysis was later extended to the cases of a nonuniformly charged spherical particle with a double layer of finite thickness [37][38][39][40] and a nonuniformly charged nonspherical particle [41][42][43][44][45]. Recently, that particles can have random charge nonuniformity has also been demonstrated experimentally [46,47].…”

Electrophoretic mobility of a spherical liposome

“…Under this condition, Anderson [11] investigated the electrophoresis of a sphere with nonuniform f, and found that the monopole and quadrupole moments of f can contribute to the translational velocity, while the dipole moment can lead to rotation. The study was also extended to ellipsoidal particles with specified nonuniform f [12] and particles with a random distribution of f [13,14].…”