@article{Dolgih_Zhukalin_Bityutskaya_2019, title={COLLECTIVE DYNAMICS AND DIMENSIONAL EFFECTS OF PHASE FORMATION IN THE «AEROSIL – POLYSTYRENE LATEX» SYSTEM}, volume={21}, url={https://journals.vsu.ru/kcmf/article/view/1150}, DOI={10.17308/kcmf.2019.21/1150}, abstractNote={<p><strong>Purpose</strong>. In addition to characterizing the optical, electronic, mechanical, and catalytic properties&nbsp;of individual nanoparticles, much attention is paid to the development of methods for assembling&nbsp;nanoparticles into large ordered or disordered superstructures. These assembly methods are based&nbsp;on many different types of interparticle interactions (Van der Waals, magnetic, electrostatic,&nbsp;molecular dipole, covalent and hydrogen bonds). Recently, the drip method has been used to study&nbsp;early structural formation in colloidal systems. When particles interact in a drying drop, depletion&nbsp;forces must be taken into account. In this paper a model experiment has been carried out to study&nbsp;the effect of depletion forces on phase formation during the drying process of a drop.&nbsp;<br><strong>Methods and methodology.</strong> Colloidal suspensions of Aerosil at a concentration of 0.1 mg / ml&nbsp;with a particle size of 100 nm and polystyrene latex with a particle size of 20 nm at a concentration&nbsp;of 10 mg / ml were used as starting materials. Homogeneous colloidal suspensions of a given<br>concentration were prepared using an ultrasonic disperser UZG-13. The particle sizes of the&nbsp;resulting suspensions were controlled by light scattering on a Photocor mini particle size meter.<br>A comparative analysis of the drying process of a droplet with the initial components and with&nbsp;their mixture has been conducted in dynamic mode. The experiments were carried out in standard&nbsp;conditions. A digital optical microscope Bresser Advance ID was used to control the drying<br>dynamics. The morphology and identifi cation of the drying products have been carried out by a&nbsp;set of methods, including IR spectroscopy - Bruker VERTEX 70, scanning microscopy - Jeol JSM-6380LV and transmission microscopy - LIBRA 120 PLUS.</p> <p><strong>Results.</strong> When a droplet of a mixture of aerosil and latex was dried, there was observed the&nbsp;formation and rapid growth of a new phase of microscopic sizes up to ten microns in a matter&nbsp;of tens of seconds. The color of the solution changes sharply from transparent light blue to bright&nbsp;blue. The formation of a new phase is localized in the central region of the drop. According to&nbsp;the data of IR spectroscopy and of electron and transmission microscopy, the resulting phase is&nbsp;crystalline SiO2.&nbsp;To interpret the obtained results, a computational experiment was carried out in a statistical&nbsp;model system of rigid non-interacting spheres in the Broun motion approximation. In the&nbsp;simulation the spatial redistribution of large particles in the presence of small particles is&nbsp;observed, leading to the occurrence of the thickenings. Phase formation is interpreted as the&nbsp;result of the action of the nonequilibrium depletion force under the conditions of the&nbsp;hydrodynamic instability of a drying drop.<br><strong>Conclusions.</strong> In the conditions of a model experiment on phase formation during drying of a&nbsp;drop of a non-interacting particles colloidal solution in the aerosil-polystyrene latex system,&nbsp;the formation and rapid growth of a new phase of crystalline SiO2 has been detected. The phase&nbsp;formation process is accompanied by a sharp change in the color of the solution from light blue&nbsp;to blue. The crystallite size varies from ten nanometers to ten microns. 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