Highly Stretchable and UV Curable Elastomers for Digital Light Processing Based 3D Printing

Patel, Dinesh K.; Sakhaei, Amir Hosein; Layani, Michael; Zhang, Biao; Ge, Qi; Magdassi, Shlomo

doi:10.1002/adma.201606000

Cited by 558 publications

(441 citation statements)

References 44 publications

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“…However, structural instability of the carbon nanoflakes on the elastic yarn‐like substrates is a common issue in this method leading to undesirable time‐dependent conductivity variations. This can negatively affect the long‐term performance of the sensor, which potentially arise from either direct exposure to liquids or repeated mechanical/thermal loadings . Therefore, there is an ongoing effort to promote the sensors sensing performance at various strain ranges and under harsh environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Montazerian

Rashidi

Dalili

et al. 2019

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This study presents a low‐cost, tunable, and stretchable sensor fabricated based on spandex (SpX) yarns coated with graphene nanoplatelets (GnP) through a dip‐coating process. The SpX/GnP is wrapped into a stretchable silicone rubber (SR) sheath to protect the conductive layer against harsh conditions, which allows for fabricating washable wearable sensors. Dip‐coating parameters are optimized to obtain the maximum GnP coating rate. The covering sheath is tailored to achieve high stretchability beyond the sensing limit of 104% for SpX/GnP/SR sensors. Adjustable sensitivity is attained by manipulating SpX immersion times broadening its application for a wide range of strains: Gauge factors as high as two orders of magnitude are achieved at tensile strains greater than ≈40%. The fabricated sensors are tested for two applications: First, the SpX/GnP sensors are integrated into composite fabrics (with no negative impact on the structural integrity of the part) for screening the yarn displacements, resin flow, solidification during the hot press forming process, and structural health monitoring under mechanical loads with minimal cross‐sensitivity to temperature/humidity. Second, the capability of SpX/GnP/SP sensors in detection of a wide range of bodily motions (from the joint motion to arterial blood pressure) is demonstrated.

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Section: Introductionmentioning

confidence: 99%

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Montazerian

Rashidi

Dalili

et al. 2019

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“…Polyacrylamide (PAAm) is the main host material applied in self‐healing hydrogels, which can be extremely stretchable and compressible after swelling with tunable amounts of water . As it is difficult for pure PAAm hydrogels to achieve high stretchability, several methods have been reported to improve the toughness and stretchability of the network through molecular complexation with finely tuned features ,. For example, Huang et al.…”

Section: Introductionmentioning

confidence: 99%

Highly Stretchable and Compressible Self‐Healing P(AA‐co‐AAm)/CoCl₂ Hydrogel Electrolyte for Flexible Supercapacitors

Dai

Zhang²,

Sun

et al. 2018

ChemElectroChem

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We report a novel tough self‐healing electrolyte on the basis of poly (acrylic acid‐co‐acrylamide) cross‐linked by divalent cobalt ions (Co2+) (P(AA‐co‐AAm)/CoCl2). Intermolecular and intramolecular hydrogen bonding work together with the metal‐coordination between Co2+ and carboxylic ions to form a hydrogel, which can resist various deformations. The hydrogel electrolyte exhibits excellent mechanical performance (elongation at break >1200 %, compressive stress >600 kPa and compressibility >90 %). The established supercapacitor based on P(AA‐co‐AAm)/CoCl2 can hold its capacitance even after bending, twisting, compressing and self‐healing. Moreover, it retains 90 % capacitance after 5000 cycles. Our electrolyte shows great prospects in manufacture of intelligent flexible equipment.

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“…The fatigue life of this concept is limited to 600 cycles at 250 kPa (operating pressure). The recent development of highly stretchable and printable elastomers makes for an interesting future for 3D-printed bending fingers if their durability can be further increased to over a few thousands cycles [15]. Another pneumatic gripper [16] integrates electroadhesion into bending fingers, allowing the gripping of soft and flat objects as well large and regular objects.…”

Section: Monolithic Polymer Constructionmentioning

confidence: 99%

Sleeved Bending Actuators for Soft Grippers: A Durable Solution for High Force-to-Weight Applications

2018

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Soft grippers are known for their ability to interact with objects that are fragile, soft or of an unknown shape, as well as humans in collaborative robotics applications. However, state-of-the-art soft grippers lack either payload capacity or durability, which limits their use in industrial applications. In fact, high force density pneumatic soft grippers require high strain and operating pressure, both of which impair their durability. This work presents a new sleeved bending actuator for soft grippers that is capable of high force density and durability. The proposed actuator is based on design principles previously proven to improve the life of pneumatic artificial muscles, where a sleeve provides a uniform reinforcement that reduces local stresses and strains in the inflated membrane. The sleeved bending actuator features a silicone membrane and an external two-material sleeve that can support high pressures while providing a flexible grip. The proposed sleeved bending actuators are validated through two grippers, sized according to foreseen soft gripper applications: A small gripper for drone perching and lightweight food manipulation, and a larger one for the manipulation of heavy material (>5 kg) of various weights and sizes. Performance assessment shows that these grippers have payloads up to 5.2 kg and 20 kg, respectively. Durability testing of the grippers demonstrates that the grippers have an expected lifetime ranging from 263,000 cycles to more than 700,000 cycles. The grippers are tested in various settings, including the integration of a gripper into a Phantom 2 quadcopter, a perching demonstration, as well as the gripping of light and heavy food items. Experiments show that sleeved bending actuators constitute a promising avenue for durable and strong soft grippers.

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Highly Stretchable and UV Curable Elastomers for Digital Light Processing Based 3D Printing

Cited by 558 publications

References 44 publications

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Highly Stretchable and Compressible Self‐Healing P(AA‐co‐AAm)/CoCl₂ Hydrogel Electrolyte for Flexible Supercapacitors

Sleeved Bending Actuators for Soft Grippers: A Durable Solution for High Force-to-Weight Applications

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Highly Stretchable and UV Curable Elastomers for Digital Light Processing Based 3D Printing

Cited by 558 publications

References 44 publications

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Highly Stretchable and Compressible Self‐Healing P(AA‐co‐AAm)/CoCl2 Hydrogel Electrolyte for Flexible Supercapacitors

Sleeved Bending Actuators for Soft Grippers: A Durable Solution for High Force-to-Weight Applications

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Product

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Highly Stretchable and Compressible Self‐Healing P(AA‐co‐AAm)/CoCl₂ Hydrogel Electrolyte for Flexible Supercapacitors