Magnetite magnetic nanoparticles (MNP) exhibit superparamagnetic behavior, which gives them important properties such as low coercive field, easy superficial modification and acceptable magnetization levels. This makes them useful in separation techniques. However, few studies have experimented with the interactions of MNP with magnetic fields. Therefore, the aim of this research was to study the influence of an oscillating magnetic field (OMF) on polymeric monolithic columns with vinylated magnetic nanoparticles (VMNP) for capillary liquid chromatography (cLC). For this purpose, MNP were synthesized by coprecipitation of iron salts. The preparation of polymeric monolithic columns was performed by copolymerization and aggregation of VMNP. Taking advantage of the magnetic properties of MNP, the influence of parameters such as resonance frequency, intensity and exposure time of a OMF applied to the synthesized columns was studied. As a result, a better separation of a sample according to the measured parameters was obtained, so that a column resolution (Rs) of 1.35 was achieved. The morphological properties of the columns were evaluated by scanning electron microscopy (SEM). The results of the chromatographic properties revealed that the best separation of the alkylbenzenes sample occurs under conditions of 5.5 kHz and 10 min of exposure in the OMF. This study constitutes a first application in chromatographic separation techniques for future research in nanotechnology.
El conocimiento de la calidad del agua es fundamental para su evaluación, procesamiento y gestión ambiental. Para lo cual existen procesos ampliamente detallados que permiten el análisis en laboratorios, sin embargo, estos métodos establecidos por las normativas legales suelen ser largos y tediosos. Por esta razón, el objetivo de esta investigación es proponer una alternativa a la metodología tradicional de los análisis de rutina en laboratorio. Para tal fin, se ha trabajado en la automatización de un sistema que permite la detección de pH y potencial redox simultáneamente en muestras de agua combinando técnicas microfluídicas de procesos químicos y automatización a microescala. El método propuesto se ha acoplado a técnicas potenciométricas y ha sido aplicado a muestras de agua, también se ha comparado el método propuesto con el uso de tecnología 3D obteniendo un sistema versátil con una frecuencia de análisis de 5 muestras por hora disminuyendo el tiempo de análisis y los residuos obtenidos a la mitad.
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