Janus particles with the asymmetric surface have potential in applications as catalysts, multifunctional cell surface targets, nanomotors, and drug delivery systems. The surface of these particles has two different sides, which can be individually designed to exhibit distinct functionalities in a single particle. Barium-hexaferrite (BHF) nanoparticles are sensitive to the magnetic field and its direction [1]. The surfaces of colloidal BHF nanoparticles have been successfully modified [2], and that is a reason why this material is a promising candidate for coupling with Au nanoparticles as an optical component of new magneto-optic hybrid Janus nanoparticles. In this work, novel Janus nanoparticles with Au and BHF faces on opposite sides were prepared using a Pickering emulsion template with paraffin wax as the oil phase (Figure 1) [3]. First, BHF nanoparticles are prepared with a classical hydrothermal route and then coated with silica [2]. The coated nanoparticles are then mixed with wax and a small amount of surfactant cetyltrimethylammonium bromide (CTAB) in order to obtain Pickering emulsion. In the next step, the obtained emulsion is silanized with a thiol-bearing silane and then coupled with citrate- capped Au nanoparticles. In the end, the protective wax surface is removed and the efficiency of the method was investigated with different characterization techniques. [1] D. Lisjak, (2018), Anisotropic magnetic nanoparticles: A review of their properties, syntheses and potential applications, Progress in Materials Science, 95, 286-328. [2] T. Goršak, (2019), A functionalization strategy for the dispersion of permanently magnetic barium-hexaferrite nanoplatelets in complex biological media, Colloids and Surfaces A, 573, 119-127. [3] L. Hong (2006), Simple Method to Produce Janus Colloidal Particles in Large Quantity, Langmuir, 22, 9495-9499.
B.03 Paper at an international scientific conference
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