Análisis microestructural y cálculo de propiedades magnéticas de suspensiones coloidales bidispersas bajo campo magnético uniforme utilizando simulaciones de dinámica Browniana
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Date
2024
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Universidad Nacional de Trujillo
Abstract
Las suspensiones coloidales magnéticas están compuestas por partículas magnéticas muy pequeñas (de 10 𝜇m a 1 nm) sumergidas en un fluido. En presencia de un campo magnético, se modifica el comportamiento microestructural de estas suspensiones, lo que lleva al control de algunas propiedades como la magnetización y la viscosidad. Debido a esto, estas suspensiones se utilizan en diversos procesos (como tratamientos contra el cáncer) y dispositivos (sistemas de disipación de energía). Se llevaron a cabo varios estudios computacionales sobre suspensiones coloidales magnéticas, principalmente para suspensiones monodispersas (partículas idénticas) que exhiben movimiento browniano y están sujetas a un campo magnético uniforme. Sin embargo, las suspensiones coloidales magnéticas bidispersas han atraído la atención en los últimos años, pero han sido poco exploradas. Estas suspensiones están compuestas por dos tipos de partículas coloidales magnéticas, en términos de tamaño, inmersas en un fluido. Como primer paso en un proyecto de investigación basado en el comportamiento microestructural y las propiedades controlables de estas suspensiones, se debe desarrollar un modelo computacional de una suspensión coloidal magnética bidispersa. En el presente estudio se presenta este modelo computacional, relativo a una suspensión coloidal bidispersa de partículas magnéticas esféricas que exhiben movimiento browniano y expuestas a un campo magnético uniforme. Las ecuaciones de movimiento de las partículas, inmersas en un fluido newtoniano, se derivan considerando el flujo progresivo, el movimiento browniano y las interacciones magnéticas, mientras que las interacciones hidrodinámicas se descuidan. Se desarrolla un código computacional para realizar simulaciones exploratorias del comportamiento microestructural de estas suspensiones.
Magnetic colloidal suspensions are composed by very small magnetic particles (from 10 𝜇m to 1 nm) immersed in a fluid. In presence of a magnetic field, the microstructural behavior of these suspensions is modified, leading to control of some properties such as magnetization and viscosity. Because of this, these suspensions are utilized in various processes (such as cancer treatments) and devices (energy dissipasion systems). Several computational studies on magnetic colloidal suspensions were carried out, mainly for monodisperse suspensions (identical particles) that exhibit brownian motion and subject to a uniform magnetic field. However, bidisperse magnetic colloidal suspensions have attracted attention in recent years, but have been little explored. They are composed by two types of magnetic colloidal particles, in terms of size, inmersed in a fluid. As a first step in a research project based on microstructural behavior and controllable properties of these suspensions, a computational model of a bidisperse magnetic colloidal suspension must be developed. In the present study, this computational model is presented, regarding a bidisperse colloidal suspension of spherical magnetic particles exhibiting brownian motion and exposed to a uniform magnetic field. The equations of motion of the particles, immersed in a newtonian fluid, are derived considering creeping flow, brownian motion and magnetic interactions, while hydrodynamic interactions are neglected. A computational code is developed to perform exploratory simulations of the microstructural behavior of these suspensions.
Magnetic colloidal suspensions are composed by very small magnetic particles (from 10 𝜇m to 1 nm) immersed in a fluid. In presence of a magnetic field, the microstructural behavior of these suspensions is modified, leading to control of some properties such as magnetization and viscosity. Because of this, these suspensions are utilized in various processes (such as cancer treatments) and devices (energy dissipasion systems). Several computational studies on magnetic colloidal suspensions were carried out, mainly for monodisperse suspensions (identical particles) that exhibit brownian motion and subject to a uniform magnetic field. However, bidisperse magnetic colloidal suspensions have attracted attention in recent years, but have been little explored. They are composed by two types of magnetic colloidal particles, in terms of size, inmersed in a fluid. As a first step in a research project based on microstructural behavior and controllable properties of these suspensions, a computational model of a bidisperse magnetic colloidal suspension must be developed. In the present study, this computational model is presented, regarding a bidisperse colloidal suspension of spherical magnetic particles exhibiting brownian motion and exposed to a uniform magnetic field. The equations of motion of the particles, immersed in a newtonian fluid, are derived considering creeping flow, brownian motion and magnetic interactions, while hydrodynamic interactions are neglected. A computational code is developed to perform exploratory simulations of the microstructural behavior of these suspensions.
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