Classical and modern interpretation of nanofluid stability
Abstract
In this work, the relationships between DLVO theory and dynamic light scattering (DLS) were investigated for a Fe-Cr-Ni-Mn-Si-Mo-Cu nanofluid system obtained through electro-erosive dispersion under the influence of 30 kHz electrical pulses. The increase in hydrodynamic diameter up to 8 $\mu$m in DLS measurements proves that attractive forces (VA) outweigh repulsive forces ($V_R$), while the autocorrelation function demonstrates a sharp deceleration of Brownian motion and a total loss of stability. Although the low charge magnitude ($\zeta$ < 15 mV) and high ion concentration indicate a reduction in the Debye length, there is a possibility of restoring the nano-scale characteristics of these agglomerates through ultrasonic treatment.
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