Unequal Particles Research Articles

Multiscale Simulation of Laser-Based Direct Energy Deposition (DED-LB/M) Using Powder Feedstock for Surface Repair of Aluminum Alloy.

Laser-based direct energy deposition (DED-LB/M) has been a promising option for the surface repair of structural aluminum alloys due to the advantages it offers, including a small heat-affected zone, high forming accuracy, and adjustable deposition materials. However, the unequal powder particle size during powder-based DED-LB/M can cause unstable flow and an uneven material flow rate per unit of time, resulting in defects such as pores, uneven deposition layers, and cracks. This paper presents a multiscale, multiphysics numerical model to investigate the underlying mechanism during the powder-based DED-LB/M surface repair process. First, the worn surfaces of aluminum alloy components with different flaw shapes and sizes were characterized and modeled. The fluid flow of the molten pool during material deposition on the worn surfaces was then investigated using a model that coupled the mesoscale discrete element method (DEM) and the finite volume method (FVM). The effect of flaw size and powder supply quantity on the evolution of the molten pool temperature, morphology, and dynamics was evaluated. The rapid heat transfer and variation in thermal stress during the multilayer DED-LB/M process were further illustrated using a macroscale thermomechanical model. The maximum stress was observed and compared with the yield stress of the adopted material, and no relative sliding was observed between deposited layers and substrate components.

Numerical discreteness errors in multispecies cosmological N-body simulations

ABSTRACT We present a detailed analysis of numerical discreteness errors in two-species, gravity-only, cosmological simulations using the density power spectrum as a diagnostic probe. In a simple set-up where both species are initialized with the same total matter transfer function, biased growth of power forms on small scales when the solver force resolution is finer than the mean interparticle separation. The artificial bias is more severe when individual density and velocity transfer functions are applied. In particular, significant large-scale offsets in power are measured between simulations with conventional offset grid initial conditions when compared against converged high-resolution results where the force resolution scale is matched to the interparticle separation. These offsets persist even when the cosmology is chosen so that the two particle species have the same mass, indicating that the error is sourced from discreteness in the total matter field as opposed to unequal particle mass. We further investigate two mitigation strategies to address discreteness errors: the frozen potential method and softened interspecies short-range forces. The former evolves particles under the approximately ‘frozen’ total matter potential in linear theory at early times, while the latter filters cross-species gravitational interactions on small scales in low-density regions. By modelling closer to the continuum limit, both mitigation strategies demonstrate considerable reductions in large-scale power spectrum offsets.

Mathematical modelling of coalescence of viscous particles: An overview

AbstractViscous particles of polymer melts and glasses coalesce under the action of surface tension. Resistance is due to viscosity, while inertia is not a contributing factor, with the Ohnesorge number being very high. Russian physicist Yakov Frenkel developed a model for neck growth during the initial stage of the merging process of two spherical particles, assuming uniform biaxial extensional flow. Frenkel's model was extended for prediction of neck size as a function of time to the completion of coalescence, expressed by an ordinary differential equation. The time t is expressed in dimensionless form as (tγ/ηR), where η, γ, and R denote the viscosity, surface tension, and particle radius, respectively. Models were also developed for viscoelastic effects, non‐isothermal conditions, and unequal diameter particles. For the coalescence of infinitely long cylinders, planar extensional flow is assumed. Other investigators presented numerical solutions of the Navier–Stokes equations, which include shear flow components, but the predictions of neck growth are not much different from those of the Frenkel‐based models. Comparisons to experiments are also discussed, involving polymers, glasses, animal tissue cells, and biomacromolecules. The models are also used in additive manufacturing applications for the determination of bonding and pore shrinkage.

Stable macroscopic liquid superlubricity induced by asymmetric contact of a mixture of unequal-diameter nanosphere additives

Solid additives can effectively overcome/alleviate the deficiencies of pure liquid lubricants themselves. However, the additive morphology involved in most of the reported solid additive/liquid lubricant systems is mostly irregular. They take more into account species differences and ignore the potential advantages of the sizes of unequal particles for the purpose of superlubricity. Herein, a mixed unequal-diameter sphere additive/ionic liquid analogue (Uneq-SA/ILA) model system is designed from the perspective of asymmetric contact between unequal-diameter spheres. It can easily enter a stable macroscopic superlubricated state (coefficient of friction as low as 0.0046) with negligible wear relative to an equal-diameter sphere additive/ILA system. Such excellent lubrication performance is attributed to the synergy of asymmetric contact between unequal-diameter spheres and low-shear-viscosity ILA; the ILA adsorbed on the sphere additive makes asymmetric slip interface between the spheres mainly concentrated inside the ILA, avoiding direct point-to-surface contact between the spheres. The film thickness of 948 μm implies that unequal-diameter spheres in the ILA have a normal accumulation space during contact, and the lubrication mechanism is dominated by hydrodynamic lubrication. This study deepens the understanding of asymmetric contact function of solid additives and provides new insights for the design of next-generation solid additive/liquid superlubrication systems.

Influencing factors of the mixing performance of a near-nozzle continuous mixer for 3D concrete printing: An analysis based on spatial Lacey mixing index (SLMI)

3D concrete printing, as a vital construction method for future development, has lately received significant attention. Unlike classic pumped concrete material extrusion process, a near-nozzle continuous mixer reduces mixing energy by eliminating long conveying distances. However, there has been limited research on it mixing quality. In the study, the first mixing phase of an innovative near-nozzle continuous mixer is explored by full-scale numerical simulation. In order to improve the mixing process of additive 3D concrete printing, it is necessary to compare the mixing efficiencies and performances of continuous mixers with different configurations under various working conditions. Sixty cases with four parameters (sideward angle, the number of paddles, rotation speed, and mixture's composition ratio in different levels) are analyzed in the discrete element method (DEM) simulation. The influences of these parameters on overall and local mixing performances are determined with the modified Lacey mixing index, the spatial Lacey mixing index (SLMI). For unequal particles introduced in this study, SLMl is combined with the equivalent volume method. Qualitative and quantitative analysis results reveal that the four-15°-paddle conveyor mixer performs better above a certain rotation speed, regardless of the mixture's composition ratio. This paper increases the understanding of the mixing process for preparing well-mixed dry materials in a continuous conveying state, which is crucial for efficient near-nozzle mixing in 3D concrete dosing.

THE FORCE PARAMETER AND PROFILE CHANGE OF LIQUID BRIDGE BETWEEN TWO UNEQUAL SPHERES—AN EXPERIMENT STUDY

The study of liquid force, which is commonly encountered in nature, has a special meaning to crystallization, removal of heavy metals from wastewater, and particle separation in industry. The Nano UTM T150 tensile machine and CCD camera were used respectively to record the force value and the profile change of liquid bridge between two unequal particles during stretching. The influences of radius ratio and liquid volume on the liquid force-displacement curves, maximum liquid force, and rupture distance were analyzed. And the experiment results were then compared with the calculating results according to the circle hypothesis and Y-L equation. Finally, the deficiency of the circle hypothesis in calculating the liquid force was analyzed, meanwhile, combining the influence of gravity, the changes of liquid profile in the whole process of stretch were further analyzed. The results show that the maximum liquid force was greatly influenced by radius ratio while the rupture distance was influenced by liquid volume a lot. What is more, the circle hypothesis can well predict the maximum liquid force, while its prediction of liquid force during the whole stretch is not accurate, this can be attributed to the fact that the liquid profile cannot be expressed as a ring after the liquid force reaches its maximum. Last but not least, based on the influence of gravity, the changes of liquid profile during the experiment were simplified as a circular to a quadratic parabola when the influence of gravity can be neglected; An ellipse which ratio of the long axis to the minor axis gradually increased when the influence of gravity is in the transition stage or has little impact. And a “cooling tower shape” to a hyperbolic, which upper out curvature is small and lower out curvature is large, when the influence of gravity can not be neglected.

Interaction between two unequal particles at intermediate Reynolds numbers: A pattern of horizontal oscillatory motion.

The two-dimensional lattice Boltzmann method (LBM) was used to study the motion of two interacting particles with different densities (ρ_{1} and ρ_{2}) and diameters (d_{1} and d_{2}), which were placed in a vertical channel under gravity. Both the density ratio (λ=ρ_{2}/ρ_{1}) and diameter ratio (r=d_{2}/d_{1}) between the particles were considered. The transition boundaries between the regime where the particles settle separately and the regime where the particles interact are identified by λ_{max}(r) and λ_{min}(r); they exhibit excellent power-law relationships with r. A pattern of horizontal oscillatory motion (HOM), characterized by a structure with a large (but light) particle right above a small (but heavy) one and strong oscillations of both particles in the horizontal direction, was revealed for r∼0.3 at intermediate Reynolds numbers. The results indicate that the magnitude of oscillations decreases with λ, whereas the frequency displays the opposite trend. A sudden increase in the terminal velocity of particles is seen, illustrating a transition from the classical pattern of drafting, kissing, and tumbling to the HOM at a certain λ. Upon increasing λ, the pattern of HOM may bifurcate into a vertical steady state at low Re or small r. Furthermore, the effects of the confinement ratio and particle-to-fluid density ratio were also examined. The existence of a critical confinement ratio is observed, beyond which the particles interact in a different manner.

Liquid Force and Rupture Distance between Two Particles

The study of liquid force has a special meaning to industrial manufacturing. By taking the liquid bridges between equal and unequal particles as objects, the liquid force‐displacement curves were measured and recorded by using a novel Nano UTM T150 tensile system. The influences of diameter, diameter ratio, liquid volume, and the surface tension on the liquid force‐distance curve, the maximum liquid force, and rupture distance were compared and sorted. The results show that the maximum liquid force and rupture distance both increase with the increase in liquid volume, particle diameter, diameter ratio, and surface tension. The diameter plays a decisive role in determining the value of the maximum liquid force compared with surface tension and liquid volume, which only influence the force value in a local range. The rupture distance shows a positive correlation with liquid volume and surface tension and a negative correlation with the diameter or diameter ratio. The maximum liquid force between unequal particles is about half of the sum of the force between the equal spheres of larger and smaller size in that system.

FinIrrSDA: A 3‐D Model for Magnetic Shape and Distribution Anisotropy of Finite Irregular Arrangements of Particles With Different Sizes, Geometries, and Orientations

AbstractThe magnetic anisotropy carried by strongly magnetic particles such as magnetite or ferrofluid‐filled pores is generally composed of shape anisotropy and distribution anisotropy. Their relative importance in rocks depends on numerous factors and has been discussed controversially. A major challenge in estimating their contributions so far has been that models for distribution anisotropy only exist for regular arrangements of equal particles along lines or in planes. Because magnetite grains or pores in rocks display wide ranges of orientations, shapes, and sizes in generally irregular arrangements, new models are needed to describe distribution anisotropy for more realistic grain and pore assemblies. The model presented in this study, FinIrrSDA, calculates shape and distribution anisotropy for finite irregular assemblies of unequal particles with different orientations. Input parameters are provided as a table with x, y, and z coordinates of the particle centers and the lengths and orientations of the major, intermediate, and minor axes of best fit ellipsoids. The model output consists of two susceptibility tensors: (1) the shape anisotropy tensor and (2) the total tensor combining shape and distribution anisotropies. FinIrrSDA can be applied to a wide range of input data sets, including known structures of synthetic samples, particle analyses from tomography data, and, subject to certain assumptions, 2‐D images. The model will hopefully increase our understanding of the interplay between shape and distribution anisotropies in natural rocks and facilitate future interpretations of both the magnetic anisotropy carried by magnetite grains and magnetic pore fabrics.

Study on the Effect of Crystal Size on the Performance of Ni-Rich Cathode Active Materials: Poly- Vs. Single Crystalline NCM622

Nickel-rich layered lithium nickel cobalt manganese oxides (NCMs, Li1+δNixCoyMnzO2, x+y+z+δ = 1 and δ > 0) are increasingly used as cathode active materials (CAMs) for lithium-ion batteries due to their high specific capacity; they are also expected to play a major role in future battery technologies, such as all-solid-state batteries. With increasing nickel content, however, the gained capacity is often accompanied by shorter cycle life due to undesired side reactions, resulting e.g. from the decomposition of residual lithium salts and surface contaminants that are present in greater amounts on Ni-rich materials,[1] as well as from the reaction of evolved lattice oxygen with the electrolyte,[2] which occurs at lower potentials for higher nickel content.[3] These processes degrade the NCM active material upon charge-discharge cycling and dramatically increase the impedance of the entire cell, eventually leading to cell failure. One way to minimize side reactions is to reduce the specific surface area through a greater NCM crystallite size, being known in the literature under the name of single crystals, which are expected to maintain their pristine surface area upon cycling.[4,5] By this approach, however, the NCM surface area normalized current of the CAM is significantly increased, possibly leading to critical overpotentials and compromising its rate capability.In this study, we investigate the electrochemical characteristics of two µm-sized NCM622 materials with a similar pristine BET surface area of ~0.3 m²/g: a polycrystalline material (PC) with secondary agglomerate diameters of ~5-10 µm comprised of primary crystallites with particle diameters on the order of ~10-1 µm, and a single crystalline material (SC) with individual primary crystallites of ~5 µm, both shown in the SEM images in Figure 1. Due to the highly unequal particle structure of the two material classes, one would expect significant differences in rate capability, long-term cycling behavior, extent of gassing at high state of charge (SOC), and the change of CAM surface area over the course of extended charge/discharge cycling.Calendered electrodes with PC or SC NCM622 with electrode loadings of ~12 mgAM/cm² were assembled in half-cells with a lithium metal reference electrode and then subjected to charge and discharge rate tests with potential cutoffs controlled by the reference electrode. Since clear differences in the rate-dependent discharge capacity of the two materials are observed, the impact of the particle morphology and the cause on the overpotential during (dis)charge are then further illuminated. In order to show that the difference in rate capability is owed to differences in the CAM surface increase upon cycling due to particle cracking that is induced by the NCM volume change upon (de-)lithiation, the Kr-BET surface area of pristine and charged electrodes of both PC and SC NCM622 is quantified. By this method, it is proven that, depending on the active material type, the CAM surface area may strongly increase, already during the very first charge. Due to this fundamental property, the amount of gas released from both CAMs is expected to differ significantly. We quantify the evolved O2 and CO2 during the first four cycles to >80 %SOC using On-Line Electrochemical Mass Spectrometry (OEMS). It is shown that the ratio of the surface area of both materials in charged state correlates well with the ratio of the amounts of gas released during electrochemical cycling. The obtained results on the fundamental properties of the two material classes on rate capability and gassing are complemented with long-term cycling experiments in full-cells at different upper cutoff potentials, chosen to be either below and or above the limit of oxygen release of NCM622 in order to analyze the evolution of the NCM622 particle morphology over extended charge/discharge cycling.In summary, this study gives comprehensive insights into the fundamental properties of poly- and single crystalline NCMs and into the impact of typical CAM failure mechanisms on the long-term cycling performance of these two material classes. Reference s : [1] J. Paulsen and J. H. Kim, USA Pat. US2014/0054495A1 (2014).[2] A. T. S. Freiberg, M. K. Roos, J. Wandt, R. de Vivie-Riedle, and H. A. Gasteiger, J. Phys. Chem. A, 122, 8828 (2018).[3] R. Jung, M. Metzger, F. Maglia, C. Stinner, and H. A. Gasteiger, J. Electrochem. Soc., 164, A1361 (2017).[4] Yongseon Kim, ACS Appl. Mater. Interfaces, 4, 2329 (2012).[5] G. Liu, M. Li, N. Wu, L. Cui, X. Huang, X. Liu, Y. Zhao, H. Chen, W. Yuan, and Y. Bai, J. Electrochem. Soc., 165, A3040 (2018). Figure 1

Pairing patterns in one-dimensional spin- and mass-imbalanced Fermi gases

We study spin- and mass-imbalanced mixtures of spin-1/2 fermions interacting via an attractive contact potential in one spatial dimension. Specifically, we address the influence of unequal particle masses on the pair formation by means of the complex Langevin method. By computing the pair-correlation function and the associated pair-momentum distribution we find that inhomogeneous pairing is present for all studied spin polarizations and mass imbalances. To further characterize the pairing behavior, we analyze the density-density correlations in momentum space, the so-called shot noise, which is experimentally accessible through time-of-flight imaging. At finite spin polarization, the latter is known to show distinct maxima at momentum configurations associated with the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) instability. Besides those maxima, we find that additional features emerge in the noise correlations when mass imbalance is increased, revealing the stability of FFLO-type correlations against mass imbalance and furnishing an experimentally accessible signature to probe this type of pairing.

Interplay of quenching temperature and drift in Brownian dynamics

We investigate the non-equilibrium evolution of ideal Brownian particles confined between two walls, following simultaneous quenches of the temperature and a constant external force. We compute (analytically and in numeric simulations) the post-quench dynamics of the density and the pressure exerted by the particles on the two walls perpendicular to the drift force. For identical walls, symmetry breaking associated with the drift gives rise to unequal particle densities and pressures on the two walls. While the pressure on one wall increases monotonically after the quench, on the other wall, depletion causes a non-monotonic dynamics with an overshooting at finite times, before the long-term steady-state value is reached. For walls immersed in a Brownian gas, the effective interaction force changes sign from repulsive at short times to attractive at late times. These findings have potential applications in various soft matter systems or fluids with charged Brownian particles, as well as carrier dynamics in semiconducting structures.

Liquid redistribution upon the liquid-bridge rupture between two unequal particles with a minimal energy method

For a polydisperse particulate system, the formation and the rupture of the liquid bridge between two unequal particles have significant effects on the local liquid distribution and the system performance. This work investigated the liquid redistribution behavior upon the liquid-bridge rupture based on the minimal energy method by means of the software Surface Evolver (SE). The redistribution behavior was represented and quantitatively measured by the liquid transfer ratio, which is the ratio of liquid volume retained on the small particle to the total volume of the liquid bridge. The calculated results, including the bridge rupture distance, the capillary force, and the transfer ratio, were compared with previously published data obtained by numerically solving the Laplace-Young equation, showing good agreements. The effects of particle radius ratio, contact angle and the volume of the liquid bridge on the liquid transfer ratio were examined. Measured by the grey relational grade, the radius ratio was found to be the most significant impact factor to the liquid transfer ratio, while the contact angle of the large particle is the least one. Based on the calculated data, an explicit regression model for the liquid transfer ratio prediction was proposed, which can be further implemented in the numerical simulation of the particulate system.

Efimov States of Three Unequal Bosons in Non-integer Dimensions

The Efimov effect for three bosons in three dimensions requires two infinitely large $s$-wave scattering lengths. We assume two identical particles with very large scattering lengths interacting with a third particle. We use a novel mathematical technique where the centrifugal barrier contains an effective dimension parameter, which allows efficient calculations precisely as in ordinary three spatial dimensions. We investigate properties and occurrence conditions of Efimov states for such systems as functions of the third scattering length, the non-integer dimension parameter, mass ratio between unequal particles, and total angular momentum. We focus on the practical interest of the existence, number of Efimov states and their scaling properties. Decreasing the dimension parameter from $3$ towards $2$ the Efimov effect and states disappear for critical values of mass ratio, angular momentum and scattering length parameter. We investigate the relations between the four variables and extract details of where and how the states disappear. Finally, we supply a qualitative relation between the dimension parameter and an external field used to squeeze a genuine three dimensional system.

Mobilities of polydisperse hard spheres near a no-slip wall

We have derived an analytical formulation for far-field hydrodynamic interactions among unequal size hard spheres near a no-slip wall and have implemented the formulation in a Stokesian dynamics model to simulate a suspension of polydisperse particles in a semi-bounded domain. The formulation is based on the multipole expansion of the boundary integral of Stokes flow, and the mobility tensors are deduced from Fáxen’s law together with Green’s function for Stokes flow near a no-slip wall. Lubrication approximation is incorporated to account for the close-distance interactions between any two particles and also between the particles and the wall. The implementation is validated against previous formulations for equal size particles and against a boundary-element code for unequal size particles. The code can be used to simulate the Stokesian or Brownian interaction of unequal particles in presence of a no-slip wall. In the current study, we applied the Stokesian dynamics model to investigate the trajectories of two unequal hard spheres and their redistribution during sedimentation parallel to a wall. We further used it to demonstrate the cases of many-particle sedimentation toward or parallel to a wall.

Experimental investigation of particle migration in suspension flow through bifurcating microchannels

Experimental measurements of velocity and concentration profiles were carried out to study transport of non‐colloidal suspension in bifurcating micro channels for both diverging and converging flow conditions using a combination of mirco‐particle image velocimetry and particle tracking velocimetry techniques. Migration of particles across the streamline was observed and symmetric velocity and concentration profile in the inlet branch becomes asymmetric in the daughter branches. Further migration of particles toward the center of the channel in the outlet branch make the profiles again symmetric. The evolution of velocity and concentration profiles was observed to be different in the symmetric and asymmetric bifurcation channels. The comparison of the streamlines for the fluid and the particles showed significant deviation near the bifurcation region. This may explain why there is unequal flow and particle partitioning during flow of suspension in asymmetric bifurcating channels as reported in many previous studies. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2293–2307, 2018

Integrable Families of Hard-Core Particles with Unequal Masses in a One-Dimensional Harmonic Trap

We show that the dynamics of particles in a one-dimensional harmonic trap with hard-core interactions can be solvable for certain arrangements of unequal masses. For any number of particles, there exist two families of unequal mass particles that have integrable dynamics, and there are additional exceptional cases for three, four and five particles. The integrable mass families are classified by Coxeter reflection groups and the corresponding solutions are Bethe ansatz-like superpositions of hyperspherical harmonics in the relative hyperangular coordinates that are then restricted to sectors of fixed particle order. We also provide evidence for superintegrability of these Coxeter mass families and conjecture maximal superintegrability.

Simulating orthokinetic heterocoagulation and cluster growth in destabilizing suspensions

Using direct numerical simulation, we investigate the coagulation behavior of non-Brownian colloidal particles as exemplified by Al2O3 particles. This yields the so-called capture efficiency, for which we give an analytical expression, as well as other time-dependent variables such as the cluster growth rate. Instead of neglecting or strongly approximating the hydrodynamic interactions between particles, we include hydrodynamic and non-hydrodynamic interactions in a Stokesian dynamics approach and a comprehensive modeling of the interparticle forces. The resulting parallelized simulation framework enables us to investigate the dynamics of polydisperse particle systems composed of several hundred particles at the same high level of modeling we used for a close investigation of the coagulation behavior of two unequal particles in shear flow. Appropriate cluster detection yields all the information about large destabilizing systems, which is needed for models used in flow-sheet simulations. After non-dimensionalization, the results can be generalized and applied to other systems tending to secondary coagulation.

Capillary and van der Waals force between microparticles with different sizes in humid air

It is well known that surface effect forces, such as van der Waals force and capillary force, are the major contributions to adhesion when microsized particles are in contact in humid environment. But it is very complex to calculate the adhesion force between two smooth unequal particles. In conventional approaches, the effective particle radius approximation and the constant half-filling angle assumptions are often used for computing the van der Waals forces between two microparticles. However, the approximation and the assumption are actually difficult to accurately model the forces between unequal particle sizes when the surfaces are with different properties. In this paper, we present a theoretical study of the van der Waals force and capillary force between two microparticles with different radii and the surface properties linked by a liquid bridge. The proposed model provides the adhesion force predictions in good agreement with the previous formula and existing experiment data. Considering the solid particles are partially wetted by the liquid bridge, the van der Waals force is calculated by divided the particle surface into a wetted part and a dry portion in our stimulation. Since the wetted surface portion of the particle is determined by the half-filling angle, the relationship between two half-filling angles of the unequal size particles is developed from the geometrical consideration, which is relate to the size ratio of the particles, the contact angle, and the separation distance. Then, the van der Waals force is determined using the surface element integration. Moreover, the influences of humidity, particles size, contact angle, and separation distance toward the adhesion forces are discussed using the proposed method. Simulations indicate that a higher relative humidity leads to bigger liquid bridges, suggesting a higher capillary force, but at the same time, the van der Waals force decreases due to the decrease in surfaces energy. As for the influence of contact angle, results show that a higher contact angle, that is, a more hydrophobic surface, reduces the capillary force but increases the van der Waals force (absolute value). The simulations also show that the both the capillary force and the van der Waals force (absolute value) increase as the particle size increases. When the particles are separated from each other, the capillary force and van der Waals force decreases gradually. These results are helpful to understand and utilize the adhesion interaction between particles with unequal sizes at the ambient condition.

Mechanistic investigation of the influence of phosphoric and boric acids in the formation of homogeneous Ni–P/ZnO@SiO2 coatings

High agglomeration of the nanoparticles and low volume fraction of nanosized inert particles within the nanocomposite thin films are found as the practical problems. In our previous work, silica coated ZnO nanoparticles (ZnO@SiO2 NPs) were synthesized to prevent dissolution of the ZnO nanoparticles (ZnO NPs) in the electrolytic Ni bath. The high agglomeration of these core–shell particles led to an unequal particle distribution in the deposit matrix. In this work, we aimed to prepare a highly homogeneous nanocomposite coating by stabilizing the nanoparticles in the medium. Adding the buffering agents, including phosphoric and boric acids to the medium, disclosed their new aspect of these inorganic acids in the prevention of particle agglomeration. The corrosion study of the resulting well-dispersed Ni–P/Zn@SiO2 nanocomposite coating confirmed a significant increase in anticorrosion performance. This increase was about 2.3 times compared to the previously prepared coating. Moreover, the probable mechanisms of phosphoric and boric acids in particle stability through the steric or/and electrostatic repulsion at the interfaces between the colloidal nanoparticles (ZnO@SiO2 NPs) and the electrolyte solution were investigated in detail.