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Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
Published on: June 23, 2017
Synthesis of fluorinated ceramic Janus particles via a Pickering emulsion method
Arnaud Zenerino1, Claire Peyratout2, Anne Aimable3
1Centre Européen de la Céramique - Ecole Nationale Supérieure de Céramique Industrielle (ENSCI), Science des Procédés Céramiques et de Traitements de Surface, UMR 7315, 12 rue Atlantis, 87068 Limoges, France; Centre Européen de la Céramique - Ecole Nationale Supérieure de Céramique Industrielle (ENSCI), Groupe d'Etudes des Matériaux Hétérogènes, 12 rue Atlantis, 87068 Limoges, France.
Hypothesis:
Dispersion or aggregation of ceramic nanoparticles in suspension is mainly influenced by their surface properties. The preparation of hydrophobic/hydrophilic nanoparticles was studied by synthesizing for the first time fluorinated Janus particles via a Pickering emulsion method.
Experiments:
Fluorinated silica Janus particles were synthesized with a "grafting to" method using silica/wax emulsions. The parameters investigated to control the emulsion were (i) the SiO2 particles/wax ratio, (ii) the cetyltrimethylammonium bromide (CTAB)/SiO2 ratio and (iii) the ionic strength, i.e. NaCl concentration. Prior to grafting with fluorinated molecules, the partially wax-embedded silica particles were functionalized with an aminosilane. Fourier Transformed Infrared and Nuclear Magnetic Resonance spectroscopies, thermogravimetric and zeta potential analyzes were conducted to characterize the fluorinated Janus particles.
Findings:
Silica quantity has an influence on the silica nanoparticles distribution at the surface of the wax solid droplets. CTAB amount controls the size and shape of silica/wax solid droplets, whereas the ionic strength in the range 0-6.22 g L(-1) does not influence the silica/wax emulsion. Aminosilane functionalization was successfully employed on partially wax-embedded silica particles, followed by a grafting step with a carboxylic acid fluorinated compound.
