Estudio experimental de las microestructuras de partículas coloidales formadas en fluidos magnéticos bidisperos
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Date
2024
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Universidad Nacional de Trujillo
Abstract
El estudio experimental de las microestructuras de partículas coloidales en fluidos magnetorreologicos bidispersos (Bi-MRFs) en presencia de distintos campos magnéticos desde campos unidimensionales hasta tridimensionales, ha sido muy poco estudiado hasta el momento. Por lo cual este trabajo propone una forma de estudiar de forma experimental mediante microscopia las microestructuras de partículas coloidales de magnetita que se forman en Bi-MRFs específicamente en fluidos magnetorreologicos basados en ferrofluidos (FF-MRFs) sin la aplicación de campo magnético y con la aplicación de campo magnético. Primero, se estudian que estructuras se forman sin la aplicación de campo magnético de lo cual se obtiene aglomerados y redes. Segundo, se estudian que estructuras se forman con la aplicación de campo magnético paralelo al plano de observación de lo cual se obtiene cadenas. Tercero, se estudia que estructuras se forman con la aplicación de campo magnético constante perpendicular al plano de observación de lo cual se obtiene aglomerados redispersados por medio de una pequeña separación en algunas áreas dejando una huella de su comportamiento anterior. Cuarto, se estudia que estructuras se forman con la aplicación de campo magnético rotacional paralelo al plano de observación de lo cual se obtiene cadenas, islas y redes. Quinto, se estudia que estructuras se forman con la aplicación de campos magnéticos de precesión con su componente rotacional paralela al plano de observación y su componente constante perpendicular al plano de observación de lo cual se obtiene islas, descomposición espinodal, redes y aglomerados redispersos totalmente en toda el área sin dejar ninguna huella de su comportamiento anterior (redispersión total). Donde a partir de este último estudio se profundiza en el comportamiento de redispersión total encontrado que en tal caso existe un largo característico del sistema. Finalmente se hace un estudio reológico de los FF-MRFs.
The experimental study of colloidal particle microstructures in bidisperse magnetorheological fluids (Bi-MRFs) in the presence of different magnetic fields from one-dimensional to three-dimensional fields has been very little studied so far. Therefore, this work proposes a way to experimentally study by microscopy the microstructures of colloidal magnetite particles that are formed in Bi-MRFs, specifically in ferrofluid-based magnetorheological fluids (FF-MRFs) without the application of a magnetic field and with the application of a magnetic field. First, we study which structures are formed without the application of a magnetic field, from which agglomerates and networks are obtained. Second, we study which structures are formed with the application of a magnetic field parallel to the observation plane, from which chains are obtained. Third, we study which structures are formed with the application of a constant magnetic field perpendicular to the observation plane, from which redispersed agglomerates are obtained by means of a small separation in some areas, leaving a trace of their previous behavior. Fourth, it is studied which structures are formed with the application of a rotational magnetic field parallel to the observation plane, from which chains, islands and networks are obtained. Fifth, it is studied which structures are formed with the application of precession magnetic fields with their rotational component parallel to the observation plane and their constant component perpendicular to the observation plane, from which islands, spinodal decomposition, networks and agglomerates are totally redispersed throughout the area without leaving any trace of their previous behavior (total redispersion). From this last study, the total redispersion behavior is deepened, finding that in such case there is a characteristic length of the system. Finally, a rheological study of the FF-MRFs is made.
The experimental study of colloidal particle microstructures in bidisperse magnetorheological fluids (Bi-MRFs) in the presence of different magnetic fields from one-dimensional to three-dimensional fields has been very little studied so far. Therefore, this work proposes a way to experimentally study by microscopy the microstructures of colloidal magnetite particles that are formed in Bi-MRFs, specifically in ferrofluid-based magnetorheological fluids (FF-MRFs) without the application of a magnetic field and with the application of a magnetic field. First, we study which structures are formed without the application of a magnetic field, from which agglomerates and networks are obtained. Second, we study which structures are formed with the application of a magnetic field parallel to the observation plane, from which chains are obtained. Third, we study which structures are formed with the application of a constant magnetic field perpendicular to the observation plane, from which redispersed agglomerates are obtained by means of a small separation in some areas, leaving a trace of their previous behavior. Fourth, it is studied which structures are formed with the application of a rotational magnetic field parallel to the observation plane, from which chains, islands and networks are obtained. Fifth, it is studied which structures are formed with the application of precession magnetic fields with their rotational component parallel to the observation plane and their constant component perpendicular to the observation plane, from which islands, spinodal decomposition, networks and agglomerates are totally redispersed throughout the area without leaving any trace of their previous behavior (total redispersion). From this last study, the total redispersion behavior is deepened, finding that in such case there is a characteristic length of the system. Finally, a rheological study of the FF-MRFs is made.
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