Ferrogeles con control remoto de la microestructura mediante campos magnéticos
Metadatos
Mostrar el registro completo del ítemAutor
Leon-Cecilla, AlbertoEditorial
Universidad de Granada
Departamento
Universidad de Granada. Programa de Doctorado en Física y Ciencias del EspacioFecha
2024Fecha lectura
2024-10-14Referencia bibliográfica
Alberto León Cecilia. Ferrogeles con control remoto de la microestructura mediante campos magnéticos. Granada: Universidad de Granada, 2018. [https://hdl.handle.net/10481/97718]
Patrocinador
Tesis Univ. Granada.; Proyecto de I+D+i PID2020-118498GB-I00 financiado por MCIN/AEI/10.13039/501100011033; Ayuda FPU19/01801 financiada por MCIN/AEI/10.13039/501100011033 y FSE ”El FSE invierte en tu futuro”, y por la Universidad de Granada; Ministerio de Ciencia, Innovación y Universidades, en el programa de ayudas complementarias a la movilidad destinadas a beneficiarios del programa de Formación del Profesorado Universitario, convocatoria de 2023 (EST23/00363)Resumen
In the last decade, there has been an increasing interest in developing materials that
can respond to diverse stimuli. The functionality of these materials is understood as
their capacity to alter their physical properties or shape in response to external stimuli.
Among these materials, magnetic hydrogels stand out due to their softness, high water
content, light weight, mechanical properties, miniaturization potential, controllability
without contact, and safe interaction with living tissues and organisms. They are
defined as three-dimensional cross-linked polymer networks swollen by water, in
which magnetic particles (MPs) are inserted. The polymers and MPs give these
materials the ability to respond to different stimuli, such as temperature, pH, chemical
compounds, and magnetic fields. These characteristics make them ideal materials
for applications related to tissue engineering, bioelectronics, drug delivery, wound
dressing, cancer treatment, environmental remediation, soft robots, and soft actuators.
The starting hypothesis of this thesis is the possibility of exerting precise
control over the microstructure and spatial distribution of MPs in hydrogels by
applying mechanical stresses or magnetic fields with adequate spatial modulation.
The validity of this hypothesis is based on the results of previous works [Mredha
et al., 2018, Lopez-Lopez et al., 2015, Scionti et al., 2013], where the possibility of
modifying the hydrogel microstructure by applying external mechanical and magnetic
stimuli was shown.
In this thesis, hydrogels and ferrogels with precise control of their microstructure
and magnetic behavior were prepared. These materials were characterized from a
macroscopical point of view via their mechanical properties and magnetic behavior,
and from a microscopical point of view using different techniques such as scanning
electron microscopy (SEM) and Fourier-Transform Infrared (FT-IR) spectroscopy. In
addition, different types of applications in the field of soft actuators and sensors were
designed for these ferrogels based on their properties.
To summarize, we studied alginate hydrogels with an anisotropic internal structure
controlled by a mechanical stress or the alignment of functionalized MPs. Regarding
these materials, we demonstrated that the anisotropy was reflected macroscopically, in
their mechanical properties, and microscopically, in the arrangement of the polymeric fibers. Subsequently, the analysis focused on semi-interpenetrating polymer network
(SIPN) ferrogels based on acrylamide and biopolymers, which showed promising
properties for soft robots, actuators, and sensors. These applications demonstrated
the potential and versatility of SIPN ferrogels, which can be prepared under different
experimental conditions, such as shape, MPs, and polymerization processes, and can
sense and actuate under different environmental conditions.