Effect of pH and zeta potential of Pickering stabilizing magnetite nanoparticles on the features of magnetized polystyrene microspheres,Polymer Engineering and Science

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Effect of pH and zeta potential of Pickering stabilizing magnetite nanoparticles on the features of magnetized polystyrene microspheres
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-11-03 , DOI: 10.1002/pen.25571
Ahmed I. A. Abd El‐Mageed _{1,

2} , Ahmed Esmail Shalan _{3,

4} , Lamiaa A. Mohamed ₁ , Hisham A. Essawy ₅ , Fouad Taha ₁ , Amro K. F. Dyab ₁

Affiliation

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.

中文翻译：

Pickering稳定磁铁矿纳米粒子的pH和Zeta电位对磁化聚苯乙烯微球特征的影响

使用几种磁铁矿纳米粒子浓度和pH值，将苯乙烯作为单体在水中乳化。在水溶性自由基引发剂的存在下，将乳化的苯乙烯滴用作聚合的模板，并形成复合颗粒。通过光以及扫描电子显微镜成像验证了苯乙烯模板滴的稳定性，这确保了颗粒参与建立机械屏障以阻止油滴聚结。此外，所生产的聚苯乙烯复合材料被强烈吸引到外部磁体上。使用zeta电位测量法可以阐明颗粒大小随pH的变化，这表明pH值占颗粒亲水性的主导地位，因此表明乳化程度，进而影响所获得的微球的尺寸。在某些情况下，形成胶囊而不是颗粒。因此，可以得出结论，磁性微球在pH 2.3下最佳形成，而与所使用的磁铁矿含量无关。

更新日期：2021-01-12

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