機械的接合部のないフレキシブルデバイスを3Dプリントするインクを開発(An ink for 3D-printing flexible devices without mechanical joints)

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2024-04-18 スイス連邦工科大学ローザンヌ校(EPFL)

ソフトロボティクスやウェアラブルデバイス用に、重さを抑えつつ機械的特性を自在に変えられる新素材「DNGEs」が開発されました。この素材は3Dプリンターで出力可能で、硬質からゴム状への変形が可能なため、ウェアラブルデバイスや義肢などに応用が期待されています。

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局所的に機械的特性が変化するダブルネットワーク粒状エラストマーの3Dプリント 3D Printing of Double Network Granular Elastomers with Locally Varying Mechanical Properties

Eva Baur, Benjamin Tiberghien, Esther Amstad
Advanced Materials  Published: 26 March 2024
DOI:https://doi.org/10.1002/adma.202313189

機械的接合部のないフレキシブルデバイスを3Dプリントするインクを開発(An ink for 3D-printing flexible devices without mechanical joints)

Abstract

Fast advances in the design of soft actuators and robots demand for new soft materials whose mechanical properties can be changed over short length scales. Elastomers can be formulated as highly stretchable or rather stiff materials and hence, are attractive for these applications. They are most frequently cast such that their composition cannot be changed over short length scales. A method that allows to locally change the composition of elastomers on hundreds of micrometer lengths scales is direct ink writing (DIW). Unfortunately, in the absence of rheomodifiers, most elastomer precursors cannot be printed through DIW. Here, 3D printable double network granular elastomers (DNGEs) whose ultimate tensile strain and stiffness can be varied over an unprecedented range are introduced. The 3D printability of these materials is leveraged to produce an elastomer finger containing rigid bones that are surrounded by a soft skin. Similarly, the rheological properties of the microparticle-based precursors are leveraged to cast elastomer slabs with locally varying stiffnesses that deform and twist in a predefined fashion. These DNGEs are foreseen to open up new avenues in the design of the next generation of smart wearables, strain sensors, prosthesis, soft actuators, and robots.

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