Mechanical self-assembly fabrication of gears

Yin, Jie; Bar-Kochba, Eyal; Chen, Xi

doi:10.1039/b904635f

Cited by 41 publications

(51 citation statements)

References 35 publications

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“…All have six teeth, and some of them have holes at their centers, which were circled with red rings in Figure. 6. This result promises a simpler process to fabricate nanogears for structuring micromotors than previously reported casting process [11,12] and electron-beam-based one [13]. The schematic diagram is given in the inset of Fig.…”

Section: Methodsmentioning

confidence: 86%

Carbon nanogears and nanotori via combustion flames

Weng

Dong

et al. 2013

2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)

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Self-organized micro-/nanostructures are obtained by a combustion flame of ethanol and a mixture of ethanol and nickel acetate. Microscopic analyses of the depositions on glass slides and Si wafers reveal that a variety of micro-/nanostructures are formed in the shapes of quadrilaterals, hexagons, nanogears, nanotori, spheres and anomalous structures. Raman spectra show two peaks at ~1352 cm -1 (D) and ~1608 cm -1 (G), respectively, which indicate that these structures are made of graphic carbons. Among these structures, carbon nanogears and nanotori were fabricated with the combustion flame technique for the first time and are with the potential to be used in nanomachines as gears and tyre. Although the growth of these patterns can be attributed to selforganization, the fact that they grow along with certain directions shows a directed self-organization nature.

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Section: Methodsmentioning

confidence: 86%

Carbon nanogears and nanotori via combustion flames

Weng

Dong

et al. 2013

2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)

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“…By following the unveiled mechanics principles, the wrinkling process of the constrained membrane thin film may provide useful hints for three-dimensional microfabrication, through controlled mechanical self-assembly and differential in-plane deformation [22][23][24][25][26][27]. The study may also provide insights for explaining the morphogenesis of certain natural or biological systems [18,19,22,23,28].…”

Section: Discussionmentioning

confidence: 99%

Spontaneous wrinkling pattern of a constrained thin film membrane

et al. 2012

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The wrinkling morphology of an inhomogeneously constrained thin film membrane is explored using finite element simulations, where a small circular area in a thin sheet undergoes expansion, and buckles emerge due to differential in-plane deformation. The local wrinkling patterns are characterized by the normalized circular (inner) area size, the modulus mismatch between the inner and outer regions, and the normalized stress in the inner area. As the stress increases, the morphology transits from ripplelike to petal-like and finally to a branched pattern. Through parametric studies, the effect of the governing variables on the pattern evolution, wave number, and maximum deflection is discussed. The model is used to qualitatively explain the delamination/blister morphology observed in thin film/substrate systems. The study has the potential of inspiring new fabrication techniques based on mechanical selfassembly.

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“…To form ordered wrinkling patterns, various strategies have been explored to regulate distribution of in-plane compression in the film, including a prepatterned substrate [4], an elastomeric mold [5], a cracked film [6], capillarity [7], and thermally, mechanically, or osmotically induced compression [8][9][10][11][12]. Application of such surface wrinkles has been found not only in measuring the elastic modulus of thin films [13] and understanding their hierarchical morphogenesis [14][15][16], but also in guiding three-dimensional microfabrications of smart adhesion devices [17,18], microlens arrays [19], self-assembled gears [20], flexible electronics [21], etc. Recent experiments demonstrate that the wrinkling instability can be mediated by mass diffusion which produces a spatiotemporal swelling actuation strain (eigenstrain).…”

Section: Introductionmentioning

confidence: 99%

Modeling kinetics of diffusion-controlled surface wrinkles

Liu

2011

Phys. Rev. E

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Nonlinear wrinkling of a compressed film on a soft substrate in the presence of inhomogeneous swelling actuation strain caused by solvent diffusion is studied. The simulation relies on a continuum model which integrates phase field microelasticity and Föppl-von Kármán plate theory. We show that the wrinkling morphologies developed in the diffusive domain exceeding a critical compression are confined and become shape and size dependent. A rich variety of wrinkling patterns observed in experiments including hexagonal ordered, dimple, or peanut structures, are numerically recovered, depending on the distribution of diffusion-mediated actuation strain. A cascade feature of the diffusion-coupled wrinkle is demonstrated as well: There are two ranges of solvent concentration within which the sequences of wrinkling pattern are different.

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Mechanical self-assembly fabrication of gears

Cited by 41 publications

References 35 publications

Carbon nanogears and nanotori via combustion flames

Carbon nanogears and nanotori via combustion flames

Spontaneous wrinkling pattern of a constrained thin film membrane

Modeling kinetics of diffusion-controlled surface wrinkles

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