Superelastic and Spring Properties of Si<sub>3</sub>N<sub>4</sub> Microcoils

Cao, Chuanbao; Du, Hong; Xu, Yongzhao; Zhu, Hongbo; Zhang, Taihua; Yang, Rong

doi:10.1002/adma.200701021

Cited by 54 publications

(48 citation statements)

References 24 publications

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“…18 The resultant SiCN was then decomposed to produce SiO 2 through reaction (1), 21 where the oxygen may come from the precursor or survival in air. The CO 2 further reacted with the solid C that resulted from the decomposition of the polymer precursor to form CO by reaction (2). Then, the SiO vapor was produced by reaction (3) to provide high partial pressures of SiO.…”

Section: Resultsmentioning

confidence: 99%

“…I N recent years, various silicon nitride (Si 3 N 4 ) nanostructures have been synthesized due to their superior properties, such as low density, high strength at high temperature, low coefficient of thermal expansion, and good resistance to corrosion, wear, thermal shock, and creep. [1][2][3] Besides, Si 3 N 4 is a wide band gap (5.3 eV) semiconductor. Si 3 N 4 nanomaterials exhibit novel electric and optical properties.…”

Section: Introductionmentioning

confidence: 99%

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Growth and Mechanism of Network‐Like Branched Si₃N₄ Nanostructures

Peng

Zhu

et al. 2010

Journal of the American Ceramic Society

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The high‐yield synthesis of network‐like branched silicon nitride (Si3N4) nanostructures by a simple template catalyst‐assisted pyrolysis of a polymer precursor, perhydropolysilazane, was reported. The templates were silicon wafers deposited with Fe films of 5–20 nm in thickness. The processes simply involved thermal cross‐linking of the preceramic polymer, crushing of the solidified polymer chunks into fine powder, and thermal pyrolysis of the powder under flowing high‐purity nitrogen. The collected white network‐like branched nanostructures are α‐Si3N4 of hexagonal phase, and their microstructures, in which the diameters of each linear part of the network‐like nanostructure varied in a very wide range from tens of nanometers to hundreds of nanometers, strongly depend on the applied growth parameters, where the key factors are the heating rate and catalyst thickness for change in the diameters. It was proposed that the Si3N4 nanonetworks were formed through “metal‐absorption on the surface of nanostructures” model by vapor–liquid–solid mechanism. The reaction mechanism of Si3N4 nanonetworks was also discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Growth and Mechanism of Network‐Like Branched Si₃N₄ Nanostructures

Peng

Zhu

et al. 2010

Journal of the American Ceramic Society

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“…Similar phenomena have been observed in other inorganic helical materials. 18,19 The above study reveals that Eq. ͑14͒ is a good approximation to analyze the mechanical properties of double-helix CMCs.…”

Section: Cmcsmentioning

confidence: 89%

“…17,18 In particular, it has been revealed that the spring constant k remains constant in the low-strain region. However, it increases nonlinearly in each loading process with increasing the relative elongation above a certain threshold.…”

Section: Mechanical Model and Superelastic Properties Of Carbon Micromentioning

confidence: 98%

Mechanical model and superelastic properties of carbon microcoils with circular cross-section

Kou

Ostrikov

et al. 2009

Journal of Applied Physics

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Here we report on an unconventional Ni–P alloy-catalyzed, high-throughput, highly reproducible chemical vapor deposition of ultralong carbon microcoils using acetylene precursor in the temperature range 700–750 °C. Scanning electron microscopy analysis reveals that the carbon microcoils have a unique double-helix structure and a uniform circular cross-section. It is shown that double-helix carbon microcoils have outstanding superelastic properties. The microcoils can be extended up to 10–20 times of their original coil length, and quickly recover the original state after releasing the force. A mechanical model of the carbon coils with a large spring index is developed to describe their extension and contraction. Given the initial coil parameters, this mechanical model can successfully account for the geometric nonlinearity of the spring constants for carbon micro- and nanocoils, and is found in a good agreement with the experimental data in the whole stretching process.

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“…keeping their average bond length nearly invariant under the maximum relative elongation of ~42% (Chen et al, 2003;Cao et al, 2008;Liu et al, 2010;Dai & Shen, 2009). …”

Section: Fig Urementioning

confidence: 99%

Effect of cross-sectional geometry on superelasticity of helical nanobelts

2012

Australian Journal of Mechanical Engineering

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The shape memory effect (SME) and the superelasticity make nanoscale chiral structures such as helical ZnO nanobelts promising for a wide range of important applications. In this paper, based on the non-linear rod model with surface effect (Wang et al, 2011), the effects of surfaces and geometrical size of the cross-section on the superelasticity of the helical nanobelts have been investigated quantitatively. Our results demonstrate the superelasticity of helical nanobelts exhibit a distinct size effect, depending on the cross-sectional geometry. We also show the effi ciency of the energy storage and retrieval of the helical nanobelts induced by the superelasticity depends strongly on the cross-sectional geometry.

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Superelastic and Spring Properties of Si₃N₄ Microcoils

Cited by 54 publications

References 24 publications

Growth and Mechanism of Network‐Like Branched Si₃N₄ Nanostructures

Growth and Mechanism of Network‐Like Branched Si₃N₄ Nanostructures

Mechanical model and superelastic properties of carbon microcoils with circular cross-section

Effect of cross-sectional geometry on superelasticity of helical nanobelts

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Superelastic and Spring Properties of Si3N4 Microcoils

Cited by 54 publications

References 24 publications

Growth and Mechanism of Network‐Like Branched Si3N4 Nanostructures

Growth and Mechanism of Network‐Like Branched Si3N4 Nanostructures

Mechanical model and superelastic properties of carbon microcoils with circular cross-section

Effect of cross-sectional geometry on superelasticity of helical nanobelts

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Superelastic and Spring Properties of Si₃N₄ Microcoils

Growth and Mechanism of Network‐Like Branched Si₃N₄ Nanostructures

Growth and Mechanism of Network‐Like Branched Si₃N₄ Nanostructures