Capillary origami and superhydrophobic membrane surfaces

Geraldi, Nicasio R.; Ouali, F. Fouzia; Morris, Robert H.; McHale, Glen; Newton, Michael I.

doi:10.1063/1.4808015

Cited by 19 publications

(12 citation statements)

References 23 publications

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“…This phenomenon is the same as that which allows the particle coating of liquid marbles; the surface energy of the final wrapped state is lower than the initial unwrapped state. Geraldi et al recently explored the interaction of flexible superhydrophobic surfaces and liquid droplets, and were able to prevent this behavior . Rough superhydrophobic surfaces do not allow water to penetrate into the surface structure, resulting in a nonadhesive reaction.…”

Section: Chemically Responsive Soft Actuatorsmentioning

confidence: 99%

Soft Actuators for Small‐Scale Robotics

et al. 2016

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This review comprises a detailed survey of ongoing methodologies for soft actuators, highlighting approaches suitable for nanometer- to centimeter-scale robotic applications. Soft robots present a special design challenge in that their actuation and sensing mechanisms are often highly integrated with the robot body and overall functionality. When less than a centimeter, they belong to an even more special subcategory of robots or devices, in that they often lack on-board power, sensing, computation, and control. Soft, active materials are particularly well suited for this task, with a wide range of stimulants and a number of impressive examples, demonstrating large deformations, high motion complexities, and varied multifunctionality. Recent research includes both the development of new materials and composites, as well as novel implementations leveraging the unique properties of soft materials.

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Section: Chemically Responsive Soft Actuatorsmentioning

confidence: 99%

Soft Actuators for Small‐Scale Robotics

et al. 2016

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“…Applications and practical situations. Capillary wrapping is a robust feature, which is observed on various systems systems with di↵erent wettability (Geraldi et al, 2013, Bae et al, 2015. At nanoscales, computer simulations even show that graphene sheets are expected to wrap around nanodroplets (Patra et al, 2009).…”

Section: Capillary Origamimentioning

confidence: 99%

Elastocapillarity: When Surface Tension Deforms Elastic Solids

Bico

Reyssat

Roman

2018

Annu. Rev. Fluid Mech.

259

195

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Although negligible at large scales, capillary forces may become dominant for submillimetric objects. Surface tension is usually associated with the spherical shape of small droplets and bubbles, wetting phenomena, imbibition or the motion of insects at the surface of water. However, beyond liquid interfaces, capillary forces can also deform solid bodies in their bulk as observed in recent experiments with very soft gels. Capillary interactions, which are responsible for the cohesion of sand castles, can also bend slender structures and induce the bundling of arrays of fibres. Thin sheets can finally spontaneously wrap liquid droplets within the limit of the constraints dictated by di↵erential geometry. The aim of this review is to describe the di↵erent scaling parameters and characteristic lengths involved in "elastocapillarity". We focus successively on three main configurations: • 3D, deformations induced in bulk solids • 1D, bending and bundling of rod-like structures • 2D, bending and stretching of thin sheets Although each configuration would deserve a detailed review, we hope our broad description will provide a general view on elastocapillarity.

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“…Gao and McCarthy further noted that sufficiently thin substrates of materials normally considered hydrophobic also self‐wrap around droplets, pointing to the distinct role of liquid adhesion and wetting in the process . Along the same line, Geraldi and coworkers showed theoretically and demonstrated experimentally how rigid topographic structures, and particularly a roughening hydrophobic coating making smooth surfaces superhydrophobic, can completely suppress capillary self‐folding of thin soft sheets.…”

Section: Types Of Capillary Self‐foldingmentioning

confidence: 99%

Self‐Folding Using Capillary Forces

Kwok

Huang

Mastrangeli

et al. 2019

Adv Materials Inter

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Self‐folding broadly refers to the assembly of 3D structures by bending, curving, and folding without the need for manual or mechanized intervention. Self‐folding is scientifically interesting because self‐folded structures, from plant leaves to gut villi to cerebral gyri, abound in nature. From an engineering perspective, self‐folding of sub‐millimeter‐sized structures addresses major hurdles in nano‐ and micro‐manufacturing. This review focuses on self‐folding using surface tension or capillary forces derived from the minimization of liquid interfacial area. Due to favorable downscaling with length, at small scales capillary forces become extremely large relative to forces that scale with volume, such as gravity or inertia, and to forces that scale with area, such as elasticity. The major demonstrated classes of capillary force assisted self‐folding are discussed. These classes include the use of rigid or soft and micro‐ or nano‐patterned precursors that are assembled using a variety of liquids such as water, molten polymers, and liquid metals. The authors outline the underlying physics and highlight important design considerations that maximize rigidity, strength, and yield of the assembled structures. They also discuss applications of capillary self‐folding structures in engineering and medicine. Finally, the authors conclude by summarizing standing challenges and describing future trends.

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Capillary origami and superhydrophobic membrane surfaces

Cited by 19 publications

References 23 publications

Soft Actuators for Small‐Scale Robotics

Soft Actuators for Small‐Scale Robotics

Elastocapillarity: When Surface Tension Deforms Elastic Solids

Self‐Folding Using Capillary Forces

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