Soft grasping mechanisms composed of shape memory polymer based self-bending units

Wang, Wei; Yu, Chak Yuk; Serrano, Pablo Antonio Abrego; Ahn, Sung‐Hoon

doi:10.1016/j.compositesb.2018.10.081

Cited by 58 publications

(33 citation statements)

References 30 publications

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“…After the device is gently removed from the handling wafer, a slight amount of residual water underneath the device layer enables easy, smooth transfer (Figure b). Separately, an ABS film is prepared via ESP of transparent ABS filament (PLASIL, source material: LG Chem, ABS HI121H) through a heated nozzle (diameter: 0.4 mm; 230 °C) onto a glass substrate (120 °C) with a 3D printer (Sprout, Former's Farm) by the fused deposition method (the distance of the nozzle from the glass substrate = 0.1 mm and the ESP speed (υ ESP ) = 30 mm s −1 ) (Figure c); the ABS film prepared via ESP has residual stress due to the alignment of polymer chains . We note that the nozzle temperature was set to be the highest temperature within the feasible range (200–230 °C according to the datasheet from LG Chem) to obtain a film surface that is as smooth as possible.…”

Section: Resultsmentioning

confidence: 99%

“…This is because patterning via ESP on a stress‐free film generally induces residual shear stress and because transformation of the film is possible through an annealing process above the glass transition temperature ( T g ). The shape can be controlled by adjusting various parameters, such as the nozzle temperature, printing speed, printing pattern, porosity, and geometric dimensions (e.g., length, width, and thickness) . To the best of our knowledge, transformation examples at the electronics level via the indirect method have not been studied.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, transformation examples at the electronics level via the indirect method have not been studied. As a framework material, we used the same ABS for the base film and for extrusion printing rather than using different materials, which guaranteed strong interfacial adhesion . To examine the reliable transformation of an electronic device layer, we created printable forms of Au electrodes and printable IGZO transistor arrays, transferred the layers onto an ABS film, and compared the corresponding electrical performance before and after transformation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Automatic Transformation of Membrane‐Type Electronic Devices into Complex 3D Structures via Extrusion Shear Printing and Thermal Relaxation of Acrylonitrile–Butadiene–Styrene Frameworks

Jang

Yoo

Kang

et al. 2019

Adv Funct Materials

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This work demonstrates a means of automatic transformation from planar electronic devices to desirable 3D forms. The method uses a spatially designed thermoplastic framework created via extrusion shear printing of acrylonitrile-butadiene-styrene (ABS) on a stress-free ABS film, which can be laminated to a membrane-type electronic device layer. Thermal annealing above the glass transition temperature allows stress relaxation in the printed polymer chains, resulting in an overall shape transformation of the framework. In addition, the significant reduction in the Young's modulus and the ability of the polymer chains to reflow in the rubbery state release the stress concentration in the electronic device layer, which can be positioned outside the neutral mechanical plane. Electrical analyses and mechanical simulations of a membrane-type Au electrode and indium gallium zinc oxide transistor arrays before and after transformation confirm the versatility of this method for developing 3D electronic devices based on planar forms.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Automatic Transformation of Membrane‐Type Electronic Devices into Complex 3D Structures via Extrusion Shear Printing and Thermal Relaxation of Acrylonitrile–Butadiene–Styrene Frameworks

Jang

Yoo

Kang

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…7f). Based on a similar idea, Wang et al [230] 3D printed Polyester (PE) fibers on a paper substrate to develop a bilayer soft self-bending mechanism. The stored strain in the printed PE layer was released upon heating above transition temperature which led to a shrinkage in PE fibers in the form of an inward bending.…”

Section: Thermo-responsive Shape Memory Polymers and Compositesmentioning

confidence: 99%

“…f) Direct 4D printing of structures and programing into several different configurations [229]. g) Self-bending gripers formed by printing PE on a paper substrate [230]. [196] Commercial epoxy polymers inkjet Self-adopting structures.…”

Section: Thermo-responsive Shape Memory Polymers and Compositesmentioning

confidence: 99%

Smart polymers and nanocomposites for 3D and 4D printing

et al. 2020

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Functional Fibers and Fabrics for Soft Robotics, Wearables, and Human–Robot Interface

2020

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Fiber that has been known for thousands of years for textile engineering, is a kind of thin 1D material with large length-diameter ratio and softness. Fiber can be further processed into 1D or 3D yarns and 2D or 3D fabrics and can be subjected to wellestablished textile manufacturing techniques, such as dyeing, twisting, sewing, knitting, weaving, braiding, etc. [1] As commercially available material, fabric has been widely used for clothing, bedding, or furniture. Such wide-adoption demonstrates fabrics/textiles to be important and adaptable as daily useable material due to their merits of protection, breathability, comfort, and durability. [2] In recent years, novel smart responsive functions are desirable to be implemented on fibers and fabrics for seamless integrations of actuators, sensors, power sources, etc., to realize the robotic fibers/fabric-based manipulators and human-robot interfaces. These emerging responsive fibers/ fabrics are desirable to offer programmable functions, actuations, perception and capable of building an intuitive and dynamic collaborative scenarios with human, promising in enabling applications such as remote operation, human motion assistance, human perception, health monitoring and biomedical detection and therapy. [3][4][5] It is an attractive concept that the future human-robot interfaces could be embodied in familiar forms for humans such as textiles or clothes. Compared with the polymeric and elastomeric soft robotics, [6][7][8][9] fibers and fabrics are advantageous in applications of soft robotics and wearables for human. The devices could be programmable to have accurate designs in configuration and high performance by traditional manufacturing processes of textile, applying twist to transform fibers into coils, yarns with hierarchical structures, which could be further fabricated into fabrics or textiles by sewing, weaving, knitting, etc., techniques (Figure 1), guaranteeing good wearability, skin affinity, washability, and durability, which are intriguing and necessary for friendly robotics interactions with human.Soft robotics include three main components of actuators, sensors, and control modules with power sources. [10,11] Of which, actuators, sensors and power sources all could be designed in the form of fibers or fabrics, rendering facile assembly, and integration by interlocking. [12] Common actuations can be Soft robotics inspired by the movement of living organisms, with excellent adaptability and accuracy for accomplishing tasks, are highly desirable for efficient operations and safe interactions with human. With the emerging wearable electronics, higher tactility and skin affinity are pursued for safe and user-friendly human-robot interactions. Fabrics interlocked by fibers perform traditional static functions such as warming, protection, and fashion. Recently, dynamic fibers and fabrics are favorable to deliver active stimulus responses such as sensing and actuating abilities for soft-robots and wearables. First, the responsive mechanisms of fiber/fabric actu...

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Soft grasping mechanisms composed of shape memory polymer based self-bending units

Cited by 58 publications

References 30 publications

Automatic Transformation of Membrane‐Type Electronic Devices into Complex 3D Structures via Extrusion Shear Printing and Thermal Relaxation of Acrylonitrile–Butadiene–Styrene Frameworks

Automatic Transformation of Membrane‐Type Electronic Devices into Complex 3D Structures via Extrusion Shear Printing and Thermal Relaxation of Acrylonitrile–Butadiene–Styrene Frameworks

Smart polymers and nanocomposites for 3D and 4D printing

Functional Fibers and Fabrics for Soft Robotics, Wearables, and Human–Robot Interface

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