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Journal of Nanomaterials
Volume 2017 (2017), Article ID 4864760, 8 pages
Research Article

Effects of Ultrasound Irradiation on the Preparation of Ethyl Cellulose Nanocapsules Containing Spirooxazine Dye

1Faculty of Mechanical Engineering, Institute for Engineering Materials and Design, Laboratory for Chemistry and Environmental Protection, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
2Institute for Environmental Protection and Sensors, Beloruska 7, SI-2000 Maribor, Slovenia

Correspondence should be addressed to Bojana VonĨina

Received 8 March 2017; Revised 8 May 2017; Accepted 25 May 2017; Published 6 July 2017

Academic Editor: P. Davide Cozzoli

Copyright © 2017 Julija Volmajer Valh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This article presents the influence of low frequency, high intensity ultrasonic irradiation on the characteristics (average size, polydispersity index) of ethyl cellulose nanocapsules encapsulating a photochromic dye. Photochromic nanocapsules were prepared by the emulsion-solvent evaporation method. The acoustic densities entering the system were systematically studied with respect to their abilities to modify and reduce the average sizes and polydispersity indexes of the nanocapsules. Scanning electron microscope, confocal laser microscope, and dynamic light scattering were utilised to characterise the structure, shape, size, and polydispersity of ethyl cellulose photochromic nanocapsules. We were able to tailor the size of the photochromic nanocapsules simply by varying the acoustic densities entering the system. At an acoustic density of 1.5 W/mL and 60 s of continuous irradiation, we were able to prepare an almost monodispersed population of the nanocapsules with an average size of 193 nm.