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Effect of pH and zeta potential of Pickering stabilizing magnetite nanoparticles on the features of magnetized polystyrene microspheres
Author(s) -
Abd ElMageed Ahmed I. A.,
Shalan Ahmed Esmail,
Mohamed Lamiaa A.,
Essawy Hisham A.,
Taha Fouad,
Dyab Amro K. F.
Publication year - 2021
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25571
Subject(s) - materials science , polystyrene , styrene , zeta potential , chemical engineering , coalescence (physics) , magnetite , ferrofluid , scanning electron microscope , dispersion polymerization , copolymer , composite number , cationic polymerization , magnetic nanoparticles , nanoparticle , pickering emulsion , polymer chemistry , composite material , nanotechnology , polymer , magnetic field , engineering , metallurgy , physics , quantum mechanics , astrobiology
Styrene as a monomer was emulsified in water using several magnetite nanoparticles concentration and pH values. Emulsified styrene drops were used as templates for polymerization, in presence of water soluble free radical initiator, and formation of composite particles. Styrene template drops stabilization was verified by light as well as scanning electron microscopy imaging, which ensured the participation of the particles in building up a mechanical barrier to stop oil drops coalescence. Furthermore, the produced polystyrene composites were strongly attracted to an external magnet. The difference in particles size as a function of pH was elucidated using zeta potential measurements, which indicated dominance of pH on the hydrophilicity of the particles and consequently the extent of emulsification, which in turn affected the size of the obtained microspheres. Under some circumstances, capsules were formed instead of particles. Thereby, it can be concluded that the magnetic microspheres are optimally formed at pH 2.3 independently of the magnetite content used.