Resumo

DALGO-FLORES, Violeta Maricela; CHANGO-LESCANO, Gabriela Cristina  e  VERA-LUZURIAGA, John Germán. Influence of an oscillating magnetic field on polymeric columns with magnetic nanoparticles. Rev.Colomb.Quim. [online]. 2020, vol.49, n.3, pp.28-35.  Epub 20-Dez-2020. ISSN 0120-2804.  https://doi.org/10.15446/rcq.v49n3.85900.

Magnetite magnetic nanoparticles (MNP) exhibit superparamagnetic behavior, which gives them important properties such as low coercive field, easy surface modification and acceptable levels of magnetization, making them useful in separation techniques. However, few studies have experimented the interactions they have with magnetic fields. For this reason, in this research, the influence of an oscillating magnetic field (CMO) on polymeric monolithic columns containing vinylized magnetite magnetic nanoparticles (VMNP) for capillary liquid chromatography was studied. For this, MNP were synthesized, by co-precipitation of iron salts. The preparation of the polymeric monolithic columns was carried out by the copolymerization method and the subsequent aggregation of VMNP. Taking advantage of the magnetic properties of the MNPs, the influence of various parameters (resonance frequency, intensity, and exposure time) of an CMO applied to the synthesized columns was studied. As a result, a better separation of the sample according to the measured parameters was obtained. Thus, achieving a column resolution (Rs) of 1.35. The morphological properties of monolithic columns were evaluated using scanning electron microscopy (SEM). The results of the chromatographic properties showed that the best separation of the sample of alkylbenzenes (ABS) in cLC occurs under conditions of 5.5 kHz and 10 min of exposure in the CMO. This study constitutes the first application in chromatographic separation techniques for future nanotechnology research.

Palavras-chave : cLC; nanoparticles; oscillation frequency; superparamagnetic.

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