Synthetic adhesive attachment discs inspired by spider's pyriform silk architecture

Jain, Dharamdeep; Sahni, Vasav; Dhinojwala, Ali

doi:10.1002/polb.23453

Cited by 16 publications

(18 citation statements)

References 23 publications

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“…Usually, fiber reinforcement is used to increase the mechanical stability of adhesive systems [ 98 , 99 ]. The fibers are embedded into the glue and provide a framework which is stronger than glue itself.…”

Section: Discussionmentioning

confidence: 99%

Multifunctional Adhesives on the Eggs of the Leaf Insect Phyllium philippinicum (Phasmatodea: Phylliidae): Solvent Influence and Biomimetic Implications

et al. 2020

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Leaf insects (Phylliidae) are well-camouflaged terrestrial herbivores. They imitate leaves of plants almost perfectly and even their eggs resemble seeds—visually and regarding to dispersal mechanisms. The eggs of the leaf insect Phyllium philippinicum utilize an adhesive system with a combination of glue, which can be reversibly activated through water contact and a water-responding framework of reinforcing fibers that facilitates their adjustment to substrate asperities and real contact area enhancement. So far, the chemical composition of this glue remains unknown. To evaluate functional aspects of the glue–solvent interaction, we tested the effects of a broad array of chemical solvents on the glue activation and measured corresponding adhesive forces. Based on these experiments, our results let us assume a proteinaceous nature of the glue with different functional chemical subunits, which enable bonding of the glue to both the surface of the egg and the unpredictable substrate. Some chemicals inhibited adhesion, but the deactivation was always reversible by water-contact and in some cases yielded even higher adhesive forces. The combination of glue and fibers also enables retaining the adhesive on the egg, even if detached from the egg’s surface. The gained insights into this versatile bioadhesive system could hereafter inspire further biomimetic adhesives.

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Section: Discussionmentioning

confidence: 99%

Multifunctional Adhesives on the Eggs of the Leaf Insect Phyllium philippinicum (Phasmatodea: Phylliidae): Solvent Influence and Biomimetic Implications

et al. 2020

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“…This also suggests new avenues for bio-inspired material design, that go beyond simple manipulation of the composition and strength of the chemical bonds at the interface to include mechanically complex adhesive structures to control and direct strain energy throughout the material. 31 …”

Section: Resultsmentioning

confidence: 99%

“…Similar phenomena were recently observed in cobweb-weaving spiders, which exploit changes in the architecture of their attachment disks, rather than in the chemistry of the silk that forms the thread to achieve different functions, such as locomotion or prey capture. 30,31 Thus, geometric and mechanical control may be a general feature of biological adhesives. This also suggests new avenues for bio-inspired material design, that go beyond simple manipulation of the composition and strength of the chemical bonds at the interface to include mechanically complex adhesive structures to control and direct strain energy throughout the material.…”

Section: Resultsmentioning

confidence: 99%

Dynamics of mussel plaque detachment

et al. 2015

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Mussels are well known for their ability to generate and maintain strong, long-lasting adhesive bonds under hostile conditions. Many prior studies attribute their adhesive strength to the strong chemical interactions between the holdfast and substrate. While chemical interactions are certainly important, adhesive performance is also determined by contact geometry, and understanding the coupling between chemical interactions and the plaque shape and mechanical properties is essential in deploying bioinspired strategies when engineering improved adhesives. To investigate how the shape and mechanical properties of the mussel's plaque contribute to its adhesive performance, we use a custom built load frame capable of fully characterizing the dynamics of the detachment. With this, we can pull on samples along any orientation, while at the same time measuring the resulting force and imaging the bulk deformations of the plaque as well as the holdfast-substrate interface where debonding occurs. We find that the force-induced yielding of the mussel plaque improves the bond strength by two orders of magnitude and that the holdfast shape improves bond strength by an additional order of magnitude as compared to other simple geometries. These results demonstrate that optimizing the contact geometry can play as important a role on adhesive performance as optimizing the chemical interactions as observed in other organisms and model systems.

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“…All these aspects, together with the structural hierarchical analysis that has been done on the piriform attachment discs (Wolff et al, 2015;Wirth et al, 2019), could be used for the development and the design of bioinspired adhesives with superior mechanical performances (Jain et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Strong and Tough Silk for Resilient Attachment Discs: The Mechanical Properties of Piriform Silk in the Spider Cupiennius salei (Keyserling, 1877)

2020

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Spiders are able to produce different types of silk with different mechanical and biological properties. Piriform silk is produced to secure spiders and their webs to surfaces by using a nano-fibril network embedded in a cement-like matrix. Despite their fundamental role, the mechanical properties and function of these anchorages are still poorly understood due to the practical difficulties in nano-fibril sample preparation, the complexity of the system, and the high variation of attachment disc structures. Here we estimated the mechanical properties of this nano-fibril silk and those of the whole silk membrane in the large wandering spider Cupiennius salei through a combination of nanoindentation and nanotensile techniques and with the support of a simple analytical model. The results highlight the mechanical properties of the piriform silk, facilitating the modeling of silk composite mechanics. This could inspire the design of more efficient bio-inspired adhesives and fabrics.

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Synthetic adhesive attachment discs inspired by spider's pyriform silk architecture

Cited by 16 publications

References 23 publications

Multifunctional Adhesives on the Eggs of the Leaf Insect Phyllium philippinicum (Phasmatodea: Phylliidae): Solvent Influence and Biomimetic Implications

Multifunctional Adhesives on the Eggs of the Leaf Insect Phyllium philippinicum (Phasmatodea: Phylliidae): Solvent Influence and Biomimetic Implications

Dynamics of mussel plaque detachment

Strong and Tough Silk for Resilient Attachment Discs: The Mechanical Properties of Piriform Silk in the Spider Cupiennius salei (Keyserling, 1877)

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