Stability of Boron Nitride Nanosphere Dispersions in the Presence of Polyelectrolytes

Abstract

Boron nitride nanospheres (BNNSs) were functionalized with polyelectrolytes. The effect of the polyelectrolyte dose and ionic strength on the charging and aggregation properties was investigated. At appropriate polyelectrolyte doses, charge neutralization occurred, whereas by increasing the dose, charge reversal was observed. The complete coating of the particles was indicated by a plateau in the ζ-potential values, which do not change significantly beyond the dose corresponding to the onset of such a plateau. The dispersions were highly aggregated around the charge neutralization point, while at lower or higher doses, the particles were stable. The salt-induced aggregation experiments revealed that the polyelectrolyte coatings contribute to the colloidal stability of the particles, namely, the critical coagulation concentrations deviated from the one determined for bare BNNSs. The presence of electrostatic and steric interparticle forces induced by the adsorbed polyelectrolyte chains was assumed. The obtained results confirm that the comprehensive investigation of the colloidal stability of BNNS particles is crucial to design stable or unstable dispersions and that polyelectrolytes are suitable agents for both stabilization and destabilization of BNNS dispersions, depending on the purpose of their application.

Dual functionality of ferrocene-based metallopolymers as radical scavengers and nanoparticle stabilizing agents

“…Based on the data reported earlier for charged polymer–particle systems, 17–19,46,47 non-DLVO-type forces may play a role in the colloidal stability including repulsive steric as well as attractive bridging and patch-charge interparticle forces. Nevertheless, the data shown in Fig.…”

“…[13][14][15] Such interparticle forces were reported in various particle-polyelectrolyte systems in the past few decades. [16][17][18][19][20] Beyond some pioneering works with gold-PFS composites, 2,3 the effect of PFS adsorption on the colloidal stability of dispersed nanoparticles has not been investigated.…”

Effect of Coating Shell on High-Frequency Polarization Loss of Core-Shell Filler Dielectric Composites: An Alternating-Field Polarization Phase-Field Simulation of BN@SiO2/PTFE Composite

“…In recent studies, based on the model of Semenovskaya [18], the phase-field model for the simulation of anisotropic dielectrics relaxation polarization has been developed [19][20][21][22], enabling the study of switching characteristics under pulsed electric fields [23], the simulation of variable temperature ferroelectric response [24], and cross-scale integration with the first-nature principle [25]. However, each component material in the BN@SiO 2 /PTFE composite is isotropic [26][27][28], which does not match the requirement of the previous models. Although Wang achieved the relaxation polarization phase-field simulation of the isotropic dielectric composite under the electrostatic field [29,30], there is still a lack of an alternating-field polarization phase-field model that can simulate the relaxation polarization of isotropic dielectric composite under the alternating field.…”