HygroSkin – Meteorosensitive Pavilion

Krieg, Oliver David

doi:10.4324/9781315678825-10

Cited by 14 publications

(16 citation statements)

References 1 publication

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“…The moisture absorption can cause swelling, shrinkage, deformation, as well as a change in the rigidity of a hygroscopic material. Although the moisture absorption in polymers has often been considered as a disadvantage because it could affect the performance of a product during its service life (Xiaosong Ma et al 2009;Wong 2010;Zhang et al 2010), humidity sensitive polymers allow the manufacturing of sensors or actuators able to respond to a change in the environment humidity level (Ramirez-figueroa et al 2016;Burgert and Fratzl 2009;Reyssat and Mahadevan 2009;Krieg et al 2013;Taccola et al 2015;Yao et al 2015;Menges and Reichert 2015;Holstov et al 2015;Wang et al 2016Wang et al , 2017Alexander and Korley 2017).…”

Section: Introductionmentioning

confidence: 99%

Moisture absorption measurement and modelling of a cellulose acetate

2021

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With a view toward the application of highly hygroscopic polymers as a humidity responsive self-actuator, the evaluation of the real time moisture concentration in the material becomes a priority. In this paper, the moisture diffusion process in a cellulose acetate (53.3% of acetylation) has been studied. Membranes of cellulose acetate (thickness within the range 66–200 µm) have been prepared, and the moisture absorption at room temperature and at a different relative humidity (RH within the range 21–53%) has been monitored. An analytical model has been used to describe the observed non-Fickian sigmoidal behavior of moisture diffusion. A relaxation factor (β) of about 0.026 s−1 and a moisture diffusion coefficient (D) of 3.35 × 10–6 mm2/s have been determined. At constant room temperature, the moisture concentration at saturation (Csat) has shown a linear relation with relative humidity. The identified values β, D and Csat of the analytical model have been used as input for the finite element simulation of the non-Fickian diffusion. The reliability of the finite element simulations has been confirmed with a second set of experiments.

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Section: Introductionmentioning

confidence: 99%

Moisture absorption measurement and modelling of a cellulose acetate

2021

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“…To drill into natural terrain by harvesting ambient moisture fluctuations, the carrier should be hygromorphic with a large 𝐾 in both dry and wet states and tightly coiled when dry. Natural wood has well-studied hygromorphic properties [15][16][17][18] and is one of the most abundant and environmentally friendly structural materials. Compared to other biodegradable water-responsive materials such as spider silk 27 , bacterial spores 28 , engineered silk film 29 , pollen paper 30 , and naturally derived hydrogels [31][32][33][34] , wood offers superior mechanical strength (E ~10 GPa), and processibility at large scales (from centimeter to meter) 15,16 (see comparison in Supplementary Table 1).…”

Section: Materials Choices and Processing Methodsmentioning

confidence: 99%

“…Compared to other biodegradable water-responsive materials such as spider silk 27 , bacterial spores 28 , engineered silk film 29 , pollen paper 30 , and naturally derived hydrogels [31][32][33][34] , wood offers superior mechanical strength (E ~10 GPa), and processibility at large scales (from centimeter to meter) 15,16 (see comparison in Supplementary Table 1). However, the high strength limits wood-based actuators with a small initial curvature (< 10 m -1 ) and limited range of curvature changes (< 30 m -1 ) [15][16][17][18] . To tackle this challenge, we develop a five-step process that involves both chemical washing and mechanical molding (see Methods 'Fabrication'), to transform the bulk wood into a tight hygromorphic coiling actuator.…”

Section: Materials Choices and Processing Methodsmentioning

confidence: 99%

Autonomous Self-Drilling Seed Carriers for Aerial Seeding with Superior Success Rates

Yao

Luo

Maheshwari

et al. 2022

Preprint

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Aerial seeding can quickly cover large and physically inaccessible areas to improve soil quality and scavenge residual nitrogen in agriculture, for postfire reforestation3–6 and wildland restoration. However, it suffers from low germination rates due to the direct exposure of unburied seeds to harsh sunlight, wind, granivorous birds, and undesirable air humidity and temperature1. Inspired by Erodium seeds, we design and fabricate self-drilling seed carriers, turning wood veneer into highly stiff (7.2 GPa when dry, and 1.2 GPa when wet) and hygromorphic bending or coiling actuators with an extremely large bending curvature (1854 m-1), 45 times larger than the literature values. Our three-tailed carrier has an 80% drilling success rate on flat land after two triggering cycles due to the beneficial resting angle (25° - 30°) of its tail anchoring, whereas the natural Erodium seed’s success rate is 0%. Our carriers can carry payloads of different sizes and contents including biofertilizers and plant seeds as large as those of whitebark pine, which are 11 mm in length. We compare experiments with numerical simulation to elucidate the curvature transformation and actuation mechanisms to guide the design and optimization of the seed carriers. Our system will significantly improve the effectiveness of aerial seeding to relieve agricultural and environmental stresses, and has potential applications in energy harvesting, soft robotics and sustainable buildings.

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“…The design of the HygroSkin mete-orosensitive Pavilion, commissioned by the FRAC Centre in Orleans, France, was conceived from the biomimetic investigation of the spruce cone principles. It was constructed with a robotic fabrication using 28 components with humidity-responsive apertures based on thin planar plywood sheets responding to humidity changes within a range from 30% to 90% [127].…”

Section: Tropic Nastic and Other Movementsmentioning

confidence: 99%

Organismal Design and Biomimetics: A Problem of Scale

et al. 2021

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Organisms and their features represent a complex system of solutions that can efficiently inspire the development of original and cutting-edge design applications: the related discipline is known as biomimetics. From the smallest to the largest, every species has developed and adapted different working principles based on their relative dimensional realm. In nature, size changes determine remarkable effects in organismal structures, functions, and evolutionary innovations. Similarly, size and scaling rules need to be considered in the biomimetic transfer of solutions to different dimensions, from nature to artefacts. The observation of principles that occur at very small scales, such as for nano- and microstructures, can often be seen and transferred to a macroscopic scale. However, this transfer is not always possible; numerous biological structures lose their functionality when applied to different scale dimensions. Hence, the evaluation of the effects and changes in scaling biological working principles to the final design dimension is crucial for the success of any biomimetic transfer process. This review intends to provide biologists and designers with an overview regarding scale-related principles in organismal design and their application to technical projects regarding mechanics, optics, electricity, and acoustics.

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HygroSkin – Meteorosensitive Pavilion

Cited by 14 publications

References 1 publication

Moisture absorption measurement and modelling of a cellulose acetate

Moisture absorption measurement and modelling of a cellulose acetate

Autonomous Self-Drilling Seed Carriers for Aerial Seeding with Superior Success Rates

Organismal Design and Biomimetics: A Problem of Scale

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