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Micro-Structured Two-Component 3D Metamaterials with Negative Thermal-Expansion Coefficient from Positive Constituents

Qu, Jingyuan 1,2; Kadic, Muamer 1,2; Naber, Andreas 1; Wegener, Martin 1,2
1 Institut für Angewandte Physik (APH), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Controlling the thermal expansion of materials is of great technological importance. Uncontrolled thermal expansion can lead to failure or irreversible destruction of structures and devices. In ordinary crystals, thermal expansion is governed by the asymmetry of the microscopic binding potential, which cannot be adjusted easily. In artificial crystals called metamaterials, thermal expansion can be controlled by structure. Here, following previous theoretical work, we fabricate three-dimensional (3D) two-component polymer micro-lattices by using gray-tone laser lithography. We perform cross-correlation analysis of optical microscopy images taken at different sample temperatures. The derived displacement-vector field reveals that the thermal expansion and resulting bending of the bi-material beams leads to a rotation of the 3D chiral crosses arranged onto a 3D checkerboard pattern within one metamaterial unit cell. These rotations can compensate the expansion of the all positive constituents, leading to an effectively near-zero thermal length-expansion coefficient, or over-compensate the expansion, leading to an effectively negative thermal length-expansion coefficient. ... mehr


Volltext §
DOI: 10.5445/IR/1000065729
Originalveröffentlichung
DOI: 10.1038/srep40643
Scopus
Zitationen: 156
Web of Science
Zitationen: 151
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Zitationen: 166
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2045-2322
urn:nbn:de:swb:90-657293
KITopen-ID: 1000065729
HGF-Programm 43.23.01 (POF III, LK 01) Advanced Optical Lithography+Microscopy
Erschienen in Scientific reports
Verlag Nature Research
Band 7
Seiten 40643
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter Composites; Mechanical properties
Nachgewiesen in Web of Science
Dimensions
Scopus
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