Magnetic field-induced particle assembly and jamming

dc.contributorAalto Universityen
dc.contributor.advisorPeng, Bo, Dr., Aalto University, Department of Applied Physics, Finland
dc.contributor.authorLiu, Xianhu
dc.contributor.departmentTeknillisen fysiikan laitosfi
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.labMolecular Materialsen
dc.contributor.schoolPerustieteiden korkeakoulufi
dc.contributor.schoolSchool of Scienceen
dc.contributor.supervisorIkkala, Olli, Distinguished Prof., Aalto University, Department of Applied Physics, Finland
dc.description.abstractFerromagnetic materials possess the ability to undergo magnetization in the presence of an external magnetic field and exhibit rapid responsiveness to magnetic field stimuli, rendering them highly suitable as carriers for stimuli-responsive materials. Furthermore, the assembly of ferromagnetic particles under the influence of a magnetic field allows for the design of assembled superstructures with diverse properties, enabling the fulfillment of specific application requirements. In this thesis, ferromagnetic cobalt (Co) and nickel (Ni) particles with various surface roughness were synthesized utilizing the polyol method. These particles were employed as building blocks for magnetic fieldinduced assembly, resulting in the formation of assembled superstructures with distinct properties. The unique characteristics of these superstructures were systematically characterized, followed by an exploration of their potential applications. Publication I utilizes a relatively smooth-surfaced ferromagnetic Co particles as building blocks enabled the assembly of weakly jammed superstructures under the influence of a magnetic field. The shape of these assembled superstructures could be controlled by adjusting the magnetic field strength, imparting tunable sensitivity in response to pressure stimuli. Publication II employs ferromagnetic Ni particles with comparatively rougher surfaces as building blocks, the heightened interparticle friction reduced the critical packing density required for achieving jamming. Consequently, strongly jammed superstructures were formed under the influence of a magnetic field. The pronounced jamming effect induced structural memory in the assembled superstructures, enabling tunable of jamming through magnetic field application kinetics and ultimately yielding broad tunability in response to stimuli. Publication III demonstrates the transfer of jamming-induced structural memory to electrical signals, which could be further transformed into visible light signals. Additionally, pulsed magnetic fields were employed to modulate the system's responsiveness.en
dc.format.extent82 + app. 64
dc.identifier.isbn978-952-64-1821-6 (electronic)
dc.identifier.isbn978-952-64-1820-9 (printed)
dc.identifier.issn1799-4942 (electronic)
dc.identifier.issn1799-4934 (printed)
dc.identifier.issn1799-4934 (ISSN-L)
dc.opnSalazar Alvarez, German, Assoc. Prof., Uppsala University, Sweden
dc.publisherAalto Universityen
dc.relation.haspart[Publication 1]: Liu, Xianhu; Hu, Xichen; Xu Quan, Ikkala, Olli; Peng, Bo. (2023). Mechanosensing with stimulus adjustable sensitivity enabled by magnetic particle assembly and machine learning. Submitted to Nano-Micro Letters (September 2023).
dc.relation.haspart[Publication 2]: Liu, Xianhu; Tan, Hongwei; Straka, Emil; Hu, Xichen; Chen, Min; van Dijken, Sebastiaan; Scacchi, Alberto; Sammalkorpi, Maria; Ikkala, Olli; Peng, Bo. (2024). Trainable bioinspired magnetic sensitivity adaptation using ferromagnetic colloidal assemblies. Cell Reports Physical Science, 101923. Full text in Acris/Aaltodoc: DOI: 10.1016/j.xcrp.2024.101923
dc.relation.haspart[Publication 3]: Liu, Xianhu; Tan, Hongwei; Rigoni, Carlo; Hartikainen, Teemu; Asghar, Nazish; van Dijken, Sebastiaan; Timonen, Jaakko. V. I.; Peng, Bo; Ikkala, Olli. (2022). Magnetic Field-Driven Particle Assembly and Jamming for Bistable Memory and Response Plasticity. Science Advances, volume 8, issue 45. Full text in Acris/Aaltodoc: DOI: 10.1126/sciadv.adc9394
dc.relation.ispartofseriesAalto University publication series DOCTORAL THESESen
dc.revWalther, Andreas, Prof., Johannes Gutenberg University, Germany
dc.revSalazar Alvarez, German, Assoc. Prof., Uppsala University, Sweden
dc.subject.keywordmagnetic particlesen
dc.titleMagnetic field-induced particle assembly and jammingen
dc.typeG5 Artikkeliväitöskirjafi
dc.type.ontasotDoctoral dissertation (article-based)en
dc.type.ontasotVäitöskirja (artikkeli)fi
local.aalto.acrisexportstatuschecked 2024-05-27_1430
local.aalto.infraOtaNano - Nanomicroscopy Center
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