aInstitute of Thermomechanics, Czech Academy of Sciences, Dolejškova 5, 18200 Prague, Czech RepublicbSchool of Engineering and Applied Sciences, Harvard University, 52 Oxford St, 02138 Cambridge, MA, USAcInstitute of Ceramics and Glass (ICV-CSIC), Campus de Cantoblanco, Kelsen 5, 28049 Madrid, Spain
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HIGHLIGHTSTransmission of longitudinal ultrasonic waves through ceramic microlattices was studied.Microlattices with tetragonal and hexagonal spatial arrangements were used.All studied structures exhibit sharp bandgaps at frequencies above 3 MHz.The locations of the bandgaps are in agreement with FEM modeling predictions.The transmission of longitudinal ultrasonic waves through periodic ceramic microlattices fabricated by Robocasting was measured in the 2–12 MHz frequency range. It was observed that these structures (scaffolds of tetragonal and hexagonal spatial arrangements with periodicity at length-scales of Symbol100 Symbolm) exhibit well-detectable acoustic band structures with bandgaps. The locations of these gaps at relatively high frequencies were shown to be in close agreement with the predictions of numerical models, especially for tetragonal scaffolds. For hexagonal scaffolds, a mixing between longitudinal and shear polarizations of the propagation modes was observed in the model, which blurred the matching of the calculated band structures with the experimentally measured bandgaps.