Zeta potential of magnetic-field-controlled silver nanoparticles
Abstract
Magnetic-field-dependent nanoparticle size does not by itself determine zeta potential, which also depends on interfacial charge, electrolyte screening, and the location of the slipping plane. We extend the sphere-packing description of silver nanoparticles by distinguishing the structural surface, the effective charge plane, and the hydrodynamic slipping plane. The model uses structural radii of \SI{20}{nm} and \SI{5}{nm} at zero field and \SI{250}{mT}, with reported zeta potentials of \SI{-13.2}{mV} and \SI{-10.0}{mV}. Effective charge is related to the defective-shell atom count. For field-independent interfacial parameters, the linear response without additional charge weighting decreases with decreasing radius. Its normalized form depends on three electrokinetic lengths through only two sums, preventing their independent determination from a field-dependent zeta curve. At (κ−1,tlig,δslip)=(3,0,1) nm, nonlinear Poisson--Boltzmann electrostatics changes the fitted shell coefficient from 0.316 to 0.299. Constant total charge still predicts an increase in zeta magnitude, opposite to the observed trend in the evaluated scenarios. Independently calibrated shell and area charge laws differ by less than \SI{0.05}{mV}, so the endpoint agreement does not distinguish these mechanisms. Propagating the initial size frequencies gives a narrower endpoint size distribution than measured. With charge parameters determined from the measured size populations, its predicted mean zeta potential is \SI{-9.131}{mV}, with standard deviation \SI{0.994}{mV}. Imposing the measured mean by charge recalibration does not remove the discrepancy in size width. The combined structural and electrokinetic model thus identifies both the size-dependent contribution to zeta potential and the interfacial information needed to interpret it.
Related
- Magnetic Particle Magnetometer Based on Langevin Response of Superparamagnetic Nanoparticles for Remote Magnetic Field Sensing
- The Fierce Morphological Battle of Silver Nanoparticles: How Irregularities, Vacancies and Defects Tip the Crossing Sizes
- Synergy and reciprocity between Brillouin and Mie scattering by the presence of silver nanoparticles in the stimulated Brillouin scattering cell
- Reduced vortex descriptors linking polycrystallinity in magnetic nanoparticles with polarized magnetic small-angle neutron scattering
- Artificial intelligence and machine learning for magnetic nanoparticles and nanocarriers in cancer imaging, drug delivery, and magnetic control: a systematic review
BibTeX
@misc{tawalbeh2026zeta,
title = {{Zeta potential of magnetic-field-controlled silver nanoparticles}},
author = {Y. Tawalbeh and M. F. Pereira},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.22611},
eprint = {2610.22611},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.22611},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Zeta potential of magnetic-field-controlled silver nanoparticles
AU - Y. Tawalbeh
AU - M. F. Pereira
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2610.22611
UR - https://arxiv.org/abs/2610.22611
AB - Magnetic-field-dependent nanoparticle size does not by itself determine zeta potential, which also depends on interfacial charge, electrolyte screening, and the location of the slipping plane. We extend the sphere-packing description of silver nanoparticles by distinguishing the structural surface, the effective charge plane, and the hydrodynamic slipping plane. The model uses structural radii of \SI{20}{nm} and \SI{5}{nm} at zero field and \SI{250}{mT}, with reported zeta potentials of \SI{-13.2}{mV} and \SI{-10.0}{mV}. Effective charge is related to the defective-shell atom count. For field-independent interfacial parameters, the linear response without additional charge weighting decreases with decreasing radius. Its normalized form depends on three electrokinetic lengths through only two sums, preventing their independent determination from a field-dependent zeta curve. At (κ^−1,t_lig,δ_slip)=(3,0,1) nm, nonlinear Poisson--Boltzmann electrostatics changes the fitted shell coefficient from 0.316 to 0.299. Constant total charge still predicts an increase in zeta magnitude, opposite to the observed trend in the evaluated scenarios. Independently calibrated shell and area charge laws differ by less than \SI{0.05}{mV}, so the endpoint agreement does not distinguish these mechanisms. Propagating the initial size frequencies gives a narrower endpoint size distribution than measured. With charge parameters determined from the measured size populations, its predicted mean zeta potential is \SI{-9.131}{mV}, with standard deviation \SI{0.994}{mV}. Imposing the measured mean by charge recalibration does not remove the discrepancy in size width. The combined structural and electrokinetic model thus identifies both the size-dependent contribution to zeta potential and the interfacial information needed to interpret it.
ER -