Mechanical characterization of hollow ceramic nanolattices
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In the analysis of complex, hierarchical structural meta-materials, it is critical to understand the mechanical behavior at each level of hierarchy in order to understand the bulk material response. We report the fabrication and mechanical deformation of hierarchical hollow tube lattice structures with features ranging from 10 nm to 100 μm, hereby referred to as nanolattices. Titanium nitride (TiN) nanolattices were fabricated using a combination of two-photon lithography, direct laser writing, and atomic layer deposition. The structure was composed of a series of tessellated regular octahedra attached at their vertices. In situ uniaxial compression experiments performed in combination with finite element analysis on individual unit cells revealed that the TiN was able to withstand tensile stresses of 1.75 GPa under monotonic loading and of up to 1.7 GPa under cyclic loading without failure. During the compression of the unit cell, the beams bifurcated via lateral-torsional buckling, which gave rise to a hyperelastic behavior in the load–displacement data. During the compression of the full nanolattice, the structure collapsed catastrophically at a high strength and modulus that agreed well with classical cellular solid scaling laws given the low relative density of 1.36 %. We discuss the compressive behavior and mechanical analysis of the unit cell of these hollow TiN nanolattices in the context of finite element analysis in combination with classical buckling laws, and the behavior of the full structure in the context of classical scaling laws of cellular solids coupled with enhanced nanoscale material properties.
KeywordsCentral Node Atomic Layer Deposition Titanium Nitride Constituent Material Tensile Yield Strength
The authors gratefully acknowledge the financial support from the Dow-Resnick Innovation Fund at Caltech, the Office of Naval Research (Grant N000140910883) and the Army Research Office through the Institute for Collaborative Biotechnologies (ICB) at Caltech (ARO Award number UCSB.ICB4b). Part of this work was carried out at the Jet Propulsion Laboratory under a contract with NASA. The authors acknowledge critical support and infrastructure provided by the Kavli Nanoscience Institute at Caltech. The authors thank Dongchan Jang for his help with nanomechanical experiments. The authors also thank Frank Greer for his help in the ALD deposition of the TiN films.
- 6.Sandhage KH, Dickerson MB, Huseman PM, Caranna MA, Clifton JD, Bull TA, Heibel TJ, Overton WR, Schoenwaelder ME (2002) Novel, bioclastic route to self-assembled, 3D, chemically tailored meso/nanostructures: shape-preserving reactive conversion of biosilica (diatom) microshells. Adv Mater 14:429–433CrossRefGoogle Scholar
- 7.Gibson LJ, Ashby MF (1999) Cellular solids: structure and properties, 2nd edn. Cambridge University Press, CambridgeGoogle Scholar
- 19.Timoshenko SP (1934) Theory of elasticity, 1st edn. McGraw-Hill Book Company, New YorkGoogle Scholar
- 20.Timoshenko SP, Gere JM (1961) Theory of elastic stability, 2nd edn. McGraw-Hill Book Company, New YorkGoogle Scholar
- 22.Jones RM (2006) Buckling of bars plates and shells, 1st edn. Bull Ridge Publishing, BlacksburgGoogle Scholar
- 24.Shackelford JF, Alexander W (2000) Materials science and engineering handbook, 3rd edn. CRC Press Inc., Boca RatonGoogle Scholar
- 27.Meyers MA, Chawla KK (1998) Mechanical behavior of materials, 1st edn. Prentice-Hall Inc., Upper Saddle RiverGoogle Scholar
- 34.McCann RC and Suryanarayana PVR (1994) Experimental study of curvature and frictional effects on buckling. In: Offshore technology conferenceGoogle Scholar