The influence of pressure on the reduction of the agglomeration of nanosolids: a case study for tungsten
Source abstract
Abstract
The present work suggests a theoretical approach to reduce the agglomeration of nanoparticles by reducing the pressure below ambient. The model considers the increase in the surface energy upon reducing the pressure as an indicator for the reduction of agglomeration. This work relates the surface energy (γ) with the shape factor ((mu)) and the applied pressure. The shape factor is defined as the ratio of the surface areas of a deformed to a non-deformed sphere. This proposed model has been applied to the multiply-twinned spherical tungsten nanoparticles prepared by H. K. Kim et al. The shape factor and surface energy have been calculated for tungsten NSs that include (sim 900-7000) atoms. The surface energy (gamma) of an NP/NS has been calculated analytically as a function of size, shape, structure, and pressure. The findings of this work show that as the fraction of the twinning volumes ((varepsilon )) increases, (mu) decreases. At zero applied pressure, the surface energy has been found to decrease as size decreases for spherical NPs. However, for non-spherical NPs, the surface energy increases as size decreases. Reducing the pressure (with respect to ambient) by 30–50 kPa, the surface energies exceed their corresponding values at zero applied-pressure at all (varepsilon). This means that the agglomeration of nanosolids can be reduced by reducing the pressure. Graphical Abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: nanoparticles nucleation surface interactions · Coagulation and Flocculation Studies · Laser-Ablation Synthesis of Nanoparticles
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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