Abstract
The evolution of the size distribution of nanoparticles depending on the concentration of nanoparticles in a colloidal solution is investigated. The formation of new stable distributions shifted relative to the initial distribution is directly related to the processes of agglomeration of nanoparticles. Using successive two-fold dilutions of nanoparticles by 2–32 times, it was shown that the maximum of the nanoparticle size distribution shifts toward smaller sizes with a decrease in the concentration of nanoparticles, both for distributions by the number of nanoparticles and for distributions by mass of nanoparticles. Thus, with dilutions, the relative concentration of individual nanoparticles increases, while the number of particles in one aggregate decreases. A mathematical model has been created that predicts a change in distribution with a change in the concentration of nanoparticles in a colloid.
Highlights
The technique of laser ablation of metal targets in a liquid is a widespread method for producing nanoparticles [1,2,3]
The Fe and Cu nanoparticles used in this work were obtained using the laser ablation technique in the water
The greatest influence on the distribution of nanoparticles is exerted by the pulse duration and pulse energy
Summary
The technique of laser ablation of metal targets in a liquid is a widespread method for producing nanoparticles [1,2,3]. One of the main characteristics of colloidal solutions of nanoparticles obtained by laser ablation in liquids is the size distribution of the number of nanoparticles. Particles in a colloid are in constant motion and interact with each other forming stable agglomerates that contribute to the size distribution. The distribution of nanoparticles ceases to change, because the processes of creation and disintegration of agglomerates begin to balance each other [6,7,8]. The size distribution of nanoparticles in a colloidal solution can change under the influence of various factors: temperature, nanoparticle size, concentration, and the type of solvent [9]
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