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Identifier 000423753
Title 3D mechanical metamaterials
Alternative Title Τρισδιάστατα μηχανικά μεταϋλικά
Author Σπανός, Ιωάννης Ε.
Thesis advisor Φαρσάρη, Μαρία
Reviewer Χαραλαμπίδης, Δημήτρης
Στρατάκης, Μανώλης
Abstract In the presented work, Multiphoton Lithography (MPL) was used to fabricate 3D mechanical metamaterials in the μm scale. MPL is a well-established fabrication method, capable of creating microstructures with a resolution exceeding a few decades nm. The mechanical response of the metamaterials was later measured with nano-Dynamic Mechanical Analysis (nano-DMA). NanoDMA is an emerging technology that can perform accurate nanoscale characterization of a material’s mechanical properties. Additionally, the deformation of the microstructures is observed and recorded real-time with a Quanta 3D FEG. For the first time to our knowledge, the mechanical properties of the photopolymerizable resin used in MPL are properly characterized. Loss and Storage modulus, Hardness and Poisson’s ratio were thoroughly and accurately determined as a function of laser power. The investigated microstructures, which include the infamous ‘bowtie’, truss-like octahedra structures, the re-entrant triangular geometry, a pioneered rotating structure and a stent with auxetic properties, are a few μm in size. Mechanical metamaterials have numerous potential applications in medicine, biology, electronics, infrastructure and aerospace. They possess superior durability and vibration absorption which can be employed in body and seismic protection. Their porous and unique architecture often resembles that of bones or other body parts, which makes them prime candidates for bone or tissue engineering. The counter-intuitive motion of negative Poison’s ratio can be used in stents, tunable filters and precise actuators.
Language English
Subject Multiphoton lithography
Δυφωτονικός πολυμερισμός
Issue date 2019-07-26
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
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