Hygroresponsive coiling of seed awns and soft actuators

Ha, Jun Seok; Choi, Sung Mok; Shin, Beomjune; Lee, Minhee; Jung, Woojin; Kim, Ho Young

doi:10.1016/j.eml.2020.100746

Cited by 25 publications

(24 citation statements)

References 28 publications

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“…The amount of strain due to the variation of relative humidity (i.e., water adsorption) is called the Coefficient of Hygroscopic Expansion (CHE) (Dawson et al, 1997). To the best of our knowledge, the CHE was measured only for Pelargonium appendiculatum using a thermo-hygrostat (Ha et al, 2020). The measured value was equal to the measured one by Dawson et al, 1997 which studied the opening of the pinecones with a hygromorphic actuation mechanism similar to the Geraniaceae one.…”

Section: Biomechanicsmentioning

confidence: 99%

“…The helical awn movement of Gerianaceae can be geometrically described by measuring the pitch (P) and radius (R) values of the helix during relative humidity changes (Ha et al, 2020).…”

Section: Biomechanicsmentioning

confidence: 99%

“…The first biomechanical study of self-burying seed aimed at the fabrication of soft hygromorphic actuator was reported by Ha et al, 2020. The researchers constructed a theoretical model to explain the tissue-level behavior of the awns, comparing the results with the experimental measurements. The researchers fabricated an artificial hygromorphic actuator whose structure was bioinspired by the seed awns features (Pitch and Radius, MFAH and Ψ) to perform helical coiling.…”

Section: From Biology To Engineeringmentioning

confidence: 99%

“…The researchers fabricated an artificial hygromorphic actuator whose structure was bioinspired by the seed awns features (Pitch and Radius, MFAH and Ψ) to perform helical coiling. The hygro-responsive awn actuators were fabricated via the directional electrospinning process using PEO polymers (active and hygromorphic layer) onto a PI (polyimide) film of 50 µm (inactive layer) (Ha et al, 2020).…”

Section: From Biology To Engineeringmentioning

confidence: 99%

See 3 more Smart Citations

Morphological Computation in Plant Seeds for a New Generation of Self-Burial and Flying Soft Robots

et al. 2021

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Plants have evolved different mechanisms to disperse from parent plants and improve germination to sustain their survival. The study of seed dispersal mechanisms, with the related structural and functional characteristics, is an active research topic for ecology, plant diversity, climate change, as well as for its relevance for material science and engineering. The natural mechanisms of seed dispersal show a rich source of robust, highly adaptive, mass and energy efficient mechanisms for optimized passive flying, landing, crawling and drilling. The secret of seeds mobility is embodied in the structural features and anatomical characteristics of their tissues, which are designed to be selectively responsive to changes in the environmental conditions, and which make seeds one of the most fascinating examples of morphological computation in Nature. Particularly clever for their spatial mobility performance, are those seeds that use their morphology and structural characteristics to be carried by the wind and dispersed over great distances (i.e. “winged” and “parachute” seeds), and seeds able to move and penetrate in soil with a self-burial mechanism driven by their hygromorphic properties and morphological features. By looking at their motion mechanisms, new design principles can be extracted and used as inspiration for smart artificial systems endowed with embodied intelligence. This mini-review systematically collects, for the first time together, the morphological, structural, biomechanical and aerodynamic information from selected plant seeds relevant to take inspiration for engineering design of soft robots, and discusses potential future developments in the field across material science, plant biology, robotics and embodied intelligence.

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Section: Biomechanicsmentioning

confidence: 99%

“…The helical awn movement of Gerianaceae can be geometrically described by measuring the pitch (P) and radius (R) values of the helix during relative humidity changes (Ha et al, 2020).…”

Section: Biomechanicsmentioning

confidence: 99%

Section: From Biology To Engineeringmentioning

confidence: 99%

Section: From Biology To Engineeringmentioning

confidence: 99%

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Morphological Computation in Plant Seeds for a New Generation of Self-Burial and Flying Soft Robots

et al. 2021

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“…This fruit is very susceptible to damage during its postharvest quality handling (Liang et al, 2020). Damage can occur during picking in the land, the distribution process to traders and consumers, and the storage process in the supply chain (La Scalia et al, 2016;Kelly et al, 2019;Ha et al, 2020). Bruised damage can cause accelerated damage to the whole fruit during subsequent handling (Li and Thomas, 2014).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Mass Tissue Strength of Strawberry Fruit between Vertical and Horizontal axes

Ansar

Murad

Sukmawaty

et al. 2020

Preprint

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BackgroundStrawberry fruit has a thin skin layer, so it is very susceptible to tissue mass damage during post-harvest handling. This article compares the strength of the strawberry mass tissue between the vertical and horizontal axes using a compression test at different speeds and compressibility levels. ResultsThe results showed that the mass tissue damage of strawberries was greater when compressed from the horizontal axis than from the vertical axis. The loading from the vertical axis obtained a combined mechanical response between the fruit structure and mass tissue cells, while from the horizontal axis the mechanical response was obtained only from the fruit structure. During compression, the fruit undergoes 3 phases of deformation, namely elastic, plastic, and permanent mass tissue damage. In the elastic deformation phase, the fruit mass tissue has not been damaged. Along with the duration of the compression, mass tissue damage has started to occur. ConclusionThe outer mass tissue of a strawberry is more susceptible to damage than the deep mass tissue. Therefore, the post-harvest handling process from agricultural land to the hands of consumers requires gentle handling to maintain fruit quality. The percentage of mass tissue damage of strawberries can be minimized if arranged vertically in the package. The percentage of fruit mass tissue damage obtained from this study can be used to predict changes in fruit volume non-destructively.

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Structure, Function, and Application of Self‐Healing Adhesives from Mistletoe Viscin

George,

Andraos,

Priemel

et al. 2023

Adv Funct Materials

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Berries from the European Mistletoe (Viscum album) possess a sticky tissue called viscin that facilitates adhesion and germination onto host trees. Recent studies of viscin have demonstrated its adhesive capacity on a range of natural and synthetic surfaces including wood, skin, metals, and plastic. Yet, the underlying mechanisms remain poorly understood. Here, an investigation of the adhesive performance of mistletoe viscin is performed, demonstrating its hygroscopic nature and ability to self‐heal following adhesive failure. It is identified that adhesion originates from a water‐soluble adhesive component that can be extracted, isolated, and characterized independently. Lap shear mechanical testing indicates that the mistletoe adhesive extract (MAE) outperforms native viscin tissue, as well as gum arabic and arabinogalactan—common plant‐based adhesives. Furthermore, humidity uptake experiments reveal that MAE can reversibly absorb nearly 100% of its mass in water from the atmosphere. In‐depth spectroscopic and mass spectrometry investigations reveal a composition consisting primarily of an atypical arabinogalactan, with additional sugar alcohols. Finally, several proof‐of‐concept applications are demonstrated using MAE for hygro‐responsive reversible adhesion between various surfaces including skin, plastic, PDMS, and paper, revealing that MAE holds potential as a biorenewable and reusable adhesive for applications in cosmetics, packaging, and potentially, tissue engineering.

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Hygroresponsive coiling of seed awns and soft actuators

Cited by 25 publications

References 28 publications

Morphological Computation in Plant Seeds for a New Generation of Self-Burial and Flying Soft Robots

Morphological Computation in Plant Seeds for a New Generation of Self-Burial and Flying Soft Robots

Comparison of the Mass Tissue Strength of Strawberry Fruit between Vertical and Horizontal axes

Structure, Function, and Application of Self‐Healing Adhesives from Mistletoe Viscin

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