The influence of laser treatment of aluminum-magnesium alloy surface on the “self-assembly” of nanoparticles during the evaporation of colloidal solution

About the authors:

Ksenia A. Batishcheva, Postgraduate Student, Engineer, Butakov Research Center, School of Energy and Power Engineering, National Research Tomsk Polytechnic University; bka1801@mail.ru; ORCID: 0000-0002-2810-6769

Yuliya N. Vympina, Postgraduate Student, Engineer, Division for Power and Electrical Engineering, School of Energy and Power Engineering, National Research Tomsk Polytechnic University; ynp2@tpu.ru

Evgenia G. Orlova, Сand. Sci. (Phys.-Math.), Senior Lecturer, Butakov Research Center, School of Energy and Power Engineering, National Research Tomsk Polytechnic University; lafleur@tpu.ru

Abstract:

Establishing the characteristics of the self-assembly of micron and sub-micron particles when colloidal solution droplets evaporate from solid surfaces is an urgent problem. This is explained by the possibility of using these structures obtained by droplet technologies to create and optimize the production of direct and indirect liquid cooling devices, electronic and sensor working boards, current-conducting coatings, optical crystals, and chemo sensors. The method used in this study for processing of metals and alloys by laser radiation is prospective for controlling the processes at the liquid/gas/solid interface.

This article aims to analyze the effect of laser processing of the widely used in the industry aluminum-magnesium alloy on the formation of a layer of particles during the droplet evaporation of colloidal solutions. The samples’ surfaces were processed by two methods: polished by tumbling and nanosecond laser pulses. The geometric parameters of the droplets of colloidal solutions evaporating from the samples’ surfaces were determined by the shadow method. To process the obtained shadow images, the Young — Laplace method was used. Using a scanning electron microscope, the authors have received the images of the particles’ layers formed due to the droplet evaporation of colloidal solutions.

The experimental studies reveal the effect of texture formed on aluminum-magnesium alloy sample on the morphology of the layer of polystyrene nanoparticles during the droplet evaporation of colloidal solutions. Due to the self-assembly of particles, solid ring-like sediments are formed, which are elongated under the action of the capillary force parallel to the motion vector of the laser beam (when creating the texture). When the solvent evaporated from the solution droplet on the textured surface, in addition to the rings, a homogeneous layer of polystyrene particles was formed. This refers to the droplet evaporation of the solution.

The results show that with an increase in the concentration of particles in the solution, the sizes of radial cracks on the rings formed due to particle deposition increase. There were no cracks on the rings at a relatively low volume concentration of particles.

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