Size-dependent and tunable elastic properties of hierarchical honeycombs with regular square and equilateral triangular cells

Zhu, Hanxing; Yan, Libo; Zhang, Renfei; Qiu, Xinming

doi:10.1016/j.actamat.2012.05.009

Cited by 36 publications

(20 citation statements)

References 28 publications

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“…Highly porous ceramics provide a growing interest for multifunctional applications such as molten metal filtration, water treatment, catalyst support, and hot gas separation owing to their tunable pore structure and unique thermal properties . Hierarchical structuring of these materials is a burgeoning scientific field which attracts tremendous interests as it contains a vast range of porosity levels with multiple length scales . This unique porous architecture contributes to some beneficial properties (ie, high compressive strength, low density) and makes it an attractive candidate for a wide range of engineering applications where porous architecture is urgently required.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

et al. 2018

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Hierarchical structured porous ceramics have attracted tremendous research interests because of their numerous excellent properties including robust mechanical strength and large surface area. In this work, silicon carbide (SiC)-based porous ceramics with three levels of pore hierarchy are fabricated from silicon particlestabilized foams and a subsequent one-step calcination after they were embedded with coke. Three-dimensional (3D) flexible nanofibrous network is adhered and wrapped on cell walls of porous ceramics, which is readily fine-tuned and tailored by the temperature to provide optimized pore structure. The resultant SiC-based porous ceramics present a density of 1.03 g/cm 3 at a porosity of 72% with a large quantity of hierarchical micro-and macropores. This hierarchical structure leads to robust compressive strength (23.52 MPa) and large surface area (64.32 m 2 /g). The fabrication method is straightforward and sought-after, providing a facile technical route for advanced hierarchical porous ceramics used in filtration and catalysis fields.flexible nanofibrous network, hierarchical porous architecture, mechanical properties, particle-stabilized foam, porous ceramics

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

et al. 2018

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“…Structural hierarchy can not only enhance the mechanical properties of materials, but may also enhance the magnitude of the linear thermal expansion coefficient of 2D and 3D cellular materials. Both the two‐ingredient 2D and 3D hierarchical materials are thus assumed to be self‐similar, as demonstrated in Figure .…”

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confidence: 99%

Giant Thermal Expansion in 2D and 3D Cellular Materials

et al. 2018

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When temperature increases, the volume of an object changes. This property was quantified as the coefficient of thermal expansion only a few hundred years ago. Part of the reason is that the change of volume due to the variation of temperature is in general extremely small and imperceptible. Here, abnormal giant linear thermal expansions in different types of two-ingredient microstructured hierarchical and self-similar cellular materials are reported. The cellular materials can be 2D or 3D, and isotropic or anisotropic, with a positive or negative thermal expansion due to the convex or/and concave shape in their representative volume elements respectively. The magnitude of the thermal expansion coefficient can be several times larger than the highest value reported in the literature. This study suggests an innovative approach to develop temperature-sensitive functional materials and devices.

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“…For the in-plane deformation of low density honeycombs, the main deformation mechanisms are cell wall bending, transverse shear, and axial stretching (or compression) [4][5][6]24], and plane strain bending of the cell walls is the dominant deformation mechanism [6,24]. As strain gradient [13][14][15][16][17][18][19][20][21][22][23][24] could significantly affect the bending and transverse shear rigidities when the cell wall thickness is between submicron and microns [12][13][14][15][16][17][18][19], the bending, transverse shear and axial stretching/compression rigidities are thus size-dependent, and given as [6,[24][25][26]…”

Section: Size-dependent Rigidities Of Micro-or Nano-sized Cell Wallsmentioning

confidence: 99%

“…When the cell wall thickness is at the nanometer scale, as the surface to volume ratio is large, both the surface elasticity and the initial stress or strain can greatly affect the bending, transverse shear and axial stretching/compression rigidities [6][7][8][9][10][11][24][25][26]…”

Section: Size-dependent Rigidities Of Micro-or Nano-sized Cell Wallsmentioning

confidence: 99%

“…It has been found that there exists a linear correlation between the surface stress and surface charge in anion adsorption on Au (111) [23]. Moreover, not only the mechanical properties but also the geometrical properties of nano-sized cellular materials can be controlled to vary over large ranges [24,25]. Thus, nano-structured cellular materials can be used as functional materials in many different areas.…”

Section: Introductionmentioning

confidence: 99%

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The high strain compression of micro- and nano-sized random irregular honeycombs

You¹,

Zhang

Zhu

et al. 2016

Mater. Res. Express

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This paper investigates the effects of cell wall thickness, initial stress/strain, and cell regularity on the high strain compressive responses of micro-and nano-sized low density random irregular honeycombs. The strain gradient effects at the micrometer scale, and the surface elasticity and initial stress effects at the nanometer scale are incorporated into the dominant deformation mechanisms in finite element simulations. It is found that the dimensionless compressive stress strain relation strongly depends on the thickness of the cell walls at the micron scale, and at the nano-meter scale, this relation is not only size-dependent, but are also tunable and controllable over a large range. It is also found that under high strain compression, the Poisson's ratios of microand nano-sized low density random irregular honeycombs strongly depend on the cell regularity, but are almost independent of the cell wall thickness and the amplitudes of the initial stress or strain.

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Size-dependent and tunable elastic properties of hierarchical honeycombs with regular square and equilateral triangular cells

Cited by 36 publications

References 28 publications

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

Giant Thermal Expansion in 2D and 3D Cellular Materials

The high strain compression of micro- and nano-sized random irregular honeycombs

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