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Updated: Feb 6, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
Honeycomb-structured metasurfaces for the adaptive nesting of endothelial cells under hemodynamic loads
Bjoern Johann Bachmann1, Costanza Giampietro, Adem Bayram
1Laboratory of Thermodynamics in Emerging Technologies, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, CH-8092, Zürich, Switzerland. aferrari@ethz.ch dpoulikakos@ethz.ch.
Abstract:
The thrombogenicity of artificial materials comprising ventricular assist devices (VADs) limits their long-term integration in the human body. A living endothelium covering the luminal surface can provide a safe interface working compatibly with blood and circumventing this problem. However, the survival of endothelial cells is endangered by non-physiological hemodynamic conditions generated by VAD function, including high wall shear stress and deformation. Here, we introduce a surface topography comprising hexagonal honeycomb shelters in which cells remodel to generate coherently organized patterns of subcellular compartments. The resulting hexagonal array shows resistance to supraphysiological loads maintaining endothelium integrity and avoiding local discontinuities.
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