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Size-Dependent and Tunable Elastic and Geometric Properties of Hierarchical Nano-Porous Materials

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Simple closed form results for all the elastic constants of the first order nano-sized hexagonal honeycombs and body-centred-cubic (BCC) open-celled foams, and their self-similar hierarchical cellular materials are obtained in this paper. It is found that if the cell wall/strut thickness of the first order honeycomb or open-celled foam is at the nano-meter scale, the elastic properties of the hierarchical porous materials are not only size-dependent owing to the surface elasticity effects, but also tunable because the amplitude of the initial surface stress/strain is adjustable and controllable. In addition, the cell diameter, cross-sectional area and volume, the total surface area and the electric capacitance of the nano-structured hierarchical honeycombs and open-celled foams can be controlled to vary over a large range. What is more, if the surface modulus of the solid material is negative, a nano-structured hierarchical cellular material could possibly be controlled to collapse automatically.
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Keywords: INITIAL STRESS; MECHANICAL PROPERTIES; SIZE EFFECTS; STRUCTURAL HIERARCHY; SURFACE EFFECTS

Document Type: Research Article

Publication date: June 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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