University of Twente Student Theses


Development of a Shape Memory Polymer-based Zigzag Structure by Magnetic Actuation

Helm, Quinty van der (2022) Development of a Shape Memory Polymer-based Zigzag Structure by Magnetic Actuation.

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Embargo date:24 November 2024
Abstract:Invasive techniques are widely used in clinical applications, however, this brings high risks in patient safety and post operative complications. Shape memory polymers (SMP) have come forward as a promising solution, but challenges are the recovery and steerability of the material used during Minimally Invasive Surgery (MIS). Controllability of SMP-based origami structures by magnetic actuation seems like a favorable solution due to its ability of retrieving large macroscopic changes. However, the influence of magnetic field strength and orientation needs to be tested to see if the SMP material has the ability to deform beyond its permanent and temporary structure and can therefore be used as a drug delivery system. The ultimate goal of this research is to investigate the influence of strength and orientation of magnetic actuation on an SMP-based origami structure to determine whether it is possible to create a third configuration, the zigzag shape. During this study multiple steps are taken to reach this final goal. Starting off, multiple samples of SMP with grafted hinges are made in the lab. After doing some basic setup experiments on a one panel SMP plate, the influence of magnetic field strength and orientation is tested. From the results it can be concluded that when the magnet dipole moment is oriented perpendicular to the applied external field it will rotate both ways at a limited maximal rotational angle. Magnets with the dipole aligned to the external magnetic field can reach higher rotational angles after a threshold of about 15-25 mT is reached. However, the concept of ’perfect misalignment’ is not taken into account here. The two panel experiments elaborate on the results of the one panel experiments by testing the possibility to create a V shape. In this setup, multiple ratios in dipole moment of two different magnets are tested, supported with calculations. From the results it can be observed that it is possible to create a V shape with alternating magnetic dipole moment vectors when they have a minimal value of 57.35×103 Am2. During the last step, aimed at creating a zigzag shape, the two panel experiments are extended to four panel experiments. However, due to internal interactions of the magnets it is harder to realize such shapes in larger samples and the right combination for creating an actual zigzag shape has not been found yet.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:44 medicine
Programme:Biomedical Technology BSc (56226)
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