h1

TY  - THES
AU  - Braunmiller, Dominik Lukas
TI  - Design and applications of anisotropic magnetic hybrid microgels
PB  - RWTH Aachen University
VL  - Dissertation
CY  - Aachen
M1  - RWTH-2025-03894
SP  - 1 Online-Ressource : Illustrationen
PY  - 2025
N1  - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
N1  - Dissertation, RWTH Aachen University, 2025
AB  - Magnetic nanoparticles (MNPs) are extensively researched and utilized in various applications, including biomedicine, sensors, and materials science. In some cases, there is a preference for soft materials over rigid particles, leading to an increased interest in magnetic soft matter materials, such as magnetic hybrid microgels (MMGs). This thesis explores the preparation, characterization, and applications of MMGs with different sizes, shapes, and compositions by using ellipsoidal maghemite MNPs as the foundation for incorporating specific magnetic properties into microgels. The first focus is on the synthesis of small anisotropic MMGs utilizing a precipitation polymerization method. These microgels feature a single MNP core surrounded by a thermoresponsive microgel shell. The nanoscale structures exhibit tunable dipolar interactions and anisotropic properties, making them ideal tracers in dense microgel systems. By utilizing these MMGs to investigate complex phase behaviors and dynamics, the findings provide valuable insights into the relationship between microgel dimensions, softness, and dynamic phase behavior. Additionally, emphasis is placed on the development of rod-shaped MMGs as pre-programmable building blocks for tissue engineering applications. Using the PRINT technique, rod-shaped MMGs are created with adjustable magnetic properties by incorporating and pre-aligning MNPs during synthesis. This approach allows for precise control over magnetic behavior, enabling the design of multi-directional scaffolds that guide cell growth. This positions pre-programmed rod-shaped MMGs as promising materials for advanced tissue engineering applications, such as wound healing, regenerative medicine, and drug testing platforms. Finally, the exploration of larger MMGs focuses on their potential role as microactuators in active microfluidic devices. The fabrication of complex-shaped MMGs is achieved using stop-flow lithography in combination with a magnetic field, allowing for the creation of intricate 3D geometries with precise nanoparticle pre-alignment. These MMGs exhibit strong magnetic properties, making them suitable for actuator applications.
LB  - PUB:(DE-HGF)11
DO  - DOI:10.18154/RWTH-2025-03894
UR  - https://publications.rwth-aachen.de/record/1010161
ER  -