Long-range linear elasticity and mechanical instability of self-scrolling binormal nanohelices under a uniaxial load

Lu, Dai; Zhang, L.; Dong, Lixin; Shen, Wei; Zhang, X. B.; Ye, Z. Z.; Nelson, Bradley J.

doi:10.1039/c1nr10650c

Cited by 17 publications

(6 citation statements)

References 37 publications

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“…. Based on the general elastic rod theory, the derivation processes for the radii a 0 and a, pitches b 0 and b as well as the loading force F, the torque along the helix axis M of each helix of H PF are the same as that Please do not adjust margins Please do not adjust margins of a loaded helical structure with two ends restricted from winding, 29 except that in this situation ≠ ! due to the fact that N≠N 0 .…”

Section: Modelingmentioning

confidence: 99%

Controllable rotational inversion in nanostructures with dual chirality

Zhu

Shen

et al. 2018

Nanoscale

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Chiral structures play an important role in natural sciences due to their great variety and potential applications. A perversion connecting two helices with opposite chirality creates a dual-chirality helical structure. In this paper, we develop a novel model to explore quantitatively the mechanical behavior of normal, binormal and transversely isotropic helical structures with dual chirality and apply these ideas to known nanostructures. It is found that both direction and amplitude of rotation can be finely controlled by designing the cross-sectional shape. A peculiar rotational inversion of overwinding followed by unwinding, observed in some gourd and cucumber tendril perversions, not only exists in transversely isotropic dual-chirality helical nanobelts, but also in the binormal/normal ones when the cross-sectional aspect ratio is close to 1. Beyond this rotational inversion region, the binormal and normal dual-chirality helical nanobelts exhibit a fixed directional rotation of unwinding and overwinding, respectively. Moreover, in the binormal case, the rotation of these helical nanobelts is nearly linear, which is promising as a possible design for linear-to-rotary motion converters. The present work suggests new designs for nanoscale devices.

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Section: Modelingmentioning

confidence: 99%

Controllable rotational inversion in nanostructures with dual chirality

Zhu

Shen

et al. 2018

Nanoscale

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“…Upon linear approximation, the Hooker coefficient of the spring is calculated as approximately 0.45 N/m, which is higher than that of SiGe/Si/Cr nanospring. [ 27 ]…”

Section: Resultsmentioning

confidence: 99%

Self‐Assembled Epitaxial Ferroelectric Oxide Nanospring with Super‐Scalability

Dong

Guo

et al. 2022

Advanced Materials

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Oxide nano-springs have attracted many research interests because of their anti-corrosion, hightemperature tolerance, oxidation resistance, and enhanced-mechanic-response from unique helix structures, enabling various nano-manipulators, nano-motors, nano-switches, sensors, and energy harvesters. However, preparing oxide nano-springs is a challenge for their intrinsic nature of lacking elasticity. Here, we developed an approach for preparing self-assembled, epitaxial, ferroelectric nanosprings with built-in strain due to the lattice mismatch in freestanding La 0.7 Sr 0.3 MnO 3 /BaTiO 3 (LSMO/BTO) bilayer heterostructures. We nd that these LSMO/BTO nano-springs can be extensively pulled or pushed up to their geometry limits back and forth without breaking, exhibiting super-scalability with full recovery capability. The phase-eld simulations reveal that the excellent scalability originates from the continuous ferroelastic domain structures, resulting from twisting under co-existing axial and shear strains. In addition, the oxide hetero-structural springs exhibit strong resilience due to the limited plastic deformation nature and the built-in strain between the bilayers. This discovery provides an alternative way for preparing and operating functional oxide nano-springs that can be applied to various technologies.

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“…Until now, this combination has proven itself to be highly successful for in-situ mechanical characterization of microelectromechanical systems (Abrahamians et al 2013), nanohelices (Dai et al 2011;Hwang et al 2009) and microtubes (Zhang et al 2008).…”

Section: Methodsmentioning

confidence: 99%

Automated Mechanical Characterization of 2-D Materials using SEM based Visual Servoing

Zimmermann

Tiemerding

Fatikow

et al. 2013

International Journal of Optomechatronics

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Nanorobotic techniques are well-known for characterization and processing of twodimensional materials. However, until now, most of the proposed handling procedures required manual feedback. This article presents an automated handling approach of two-dimensional nanomaterials using a robotic setup inside a high-resolution scanning electron microscope. Applying image processing of the visual feedback provided by the electron microscope, a fully automated sequence is developed to align a robotic driven force sensor with sub-micrometer accuracy and to conduct nanoindentation measurements on a periodically perforated substrate. As an example, this automated sequence is utilized to examine the mechanical properties of a few-layer graphene membrane. The results of the mechanical characterization are compared to Raman spectroscopy data. The article discusses the advantages and restrictions of this technique and responds to further application scenarios.

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Long-range linear elasticity and mechanical instability of self-scrolling binormal nanohelices under a uniaxial load

Cited by 17 publications

References 37 publications

Controllable rotational inversion in nanostructures with dual chirality

Controllable rotational inversion in nanostructures with dual chirality

Self‐Assembled Epitaxial Ferroelectric Oxide Nanospring with Super‐Scalability

Automated Mechanical Characterization of 2-D Materials using SEM based Visual Servoing

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