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Significantly accelerated osteoblast cell growth on aligned TiO2 nanotubes.
The adhesion/propagation of the osteoblast is substantially improved by the topography of the TiO2 nanotubes with the filopodia of growing cells actually going into the nanotube pores, producing an interlocked cell structure. Expand
Microstructures to control elasticity in 3D printing
This work builds on work in the area of metamaterials, using numerical optimization to design tiled microstructures with desired properties, but with the key difference that this method designs families of related structures that can be interpolated to smoothly vary the material properties over a wide range. Expand
Bifurcation-based acoustic switching and rectification.
A new mechanism for tunable rectification that uses bifurcations and chaos is demonstrated and envisage this mechanism to enable the design of advanced photonic, thermal and acoustic materials and devices. Expand
Strongly nonlinear waves in a chain of Teflon beads.
One-dimensional "sonic vacuum" type phononic crystals were assembled from a chain of polytetrafluoroethylene (PTFE,Teflon) spheres with different diameters in a Teflon holder and demonstrated that it supports propagation of strongly nonlinear solitary waves with a very low speed. Expand
Tunability of solitary wave properties in one-dimensional strongly nonlinear phononic crystals.
Experimental results agreed reasonably well with the long-wave approximation and numerical calculations based on the Hertz interaction law for particles interactions. Expand
Anomalous wave reflection at the interface of two strongly nonlinear granular media.
The first experimental observation of the dramatic change of solitary wave reflectivity from the interface of two granular media triggered by a magnetically induced precompression is reported. Expand
Interaction of highly nonlinear solitary waves with linear elastic media.
This preliminary study establishes the foundation for utilizing reflected solitary waves as novel information carriers in nondestructive evaluation of elastic material systems. Expand
Generation and control of sound bullets with a nonlinear acoustic lens
  • A. Spadoni, C. Daraio
  • Physics, Medicine
  • Proceedings of the National Academy of Sciences
  • 31 August 2009
A qualitatively new way of generating high-energy acoustic pulses, which may improve imaging capabilities through increased accuracy and signal-to-noise ratios and may lead to more effective nonintrusive scalpels, for example, for cancer treatment. Expand
Growth of nano-scale hydroxyapatite using chemically treated titanium oxide nanotubes.
It is shown that the presence of TiO2 nanotubes induces the growth of a "nano-inspired nanostructure", i.e., extremely fine-scale nanofibers of bioactive sodium titanate structure on the top edge of the approximately 15 nm thick nanotube wall. Expand
Stable propagation of mechanical signals in soft media using stored elastic energy
A nonlinear soft system that is able to propagate large-amplitude signals over arbitrary distances without any signal degradation is demonstrated, made use of bistable beams to store and then release elastic energy along the path of the wave, balancing both dissipative and dispersive effects. Expand