Biomimetic Shape–Color Double‐Responsive 4D Printing

Wang, Jingchun; Wang, Zhenguo; Song, Zhengyi; Ren, Luquan; Liu, Qingping; Ren, Lei

doi:10.1002/admt.201900293

Cited by 82 publications

(56 citation statements)

References 34 publications

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“…Another multi-function approach was chosen by Wang et al who combined shape memory properties with thermochromics properties. 65 They found an influence of the printing parameters, namely nozzle temperature and layer thickness, as well as of geometry and excitation temperature on the recovery ratios. The most critical parameter to define was the ratio of recovery and color conversion speed, which was enabled by fitting the aforementioned parameters, in this way allowing for preparing blooming, color-changing flowers etc.…”

Section: Pla Compositesmentioning

confidence: 99%

3D printing of shape memory polymers

Ehrmann¹,

Ehrmann

2021

J of Applied Polymer Sci

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Shape memory polymers (SMPs) are polymers which ''remember'' their original shape and can return to it after deformation, if an external stimulus-often an increased temperatureis applied. Some SMPs can be 3D printed, typically by fused deposition modeling (FDM). The most well-known SMP is poly(lactic acid), which belongs to the most often used materials in FDM 3D printing. There are; however, many more SMPs which can be 3D printed to combine the possibilities to prepare new, sophisticated shapes with the opportunity to restore these shapes after undesirable or intentional deformation. This review gives an overview of several 3D printable SMPs, their mechanical characteristics and their possible applications.

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Section: Pla Compositesmentioning

confidence: 99%

3D printing of shape memory polymers

Ehrmann¹,

Ehrmann

2021

J of Applied Polymer Sci

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“…Various color‐tunable or shape‐tunable materials are thus developed based on polymers, hydrogels, and so on. [ 14–18 ]…”

Section: Figurementioning

confidence: 99%

3D‐Printed Biomimetic Systems with Synergetic Color and Shape Responses Based on Oblate Cholesteric Liquid Crystal Droplets

Yang

Ruan

et al. 2021

Advanced Materials

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Living organisms in nature have amazing control over their color, shape, and morphology in response to environmental stimuli for camouflage, communication, or reproduction. Inspired by the camouflage of the octopus via the elongation or contraction of its pigment cells, oblate cholesteric liquid crystal droplets are dispersed in a polymer matrix, serving as the role of pigment cells and showing structural color due to selective Bragg reflection by their periodic helical structure. The color of 3D‐printed biomimetic systems can be tuned by changing the helical pitch via the chiral dopant concentration or temperature. When the oblate liquid crystal droplets are heated up to isotropic, the opaque and colored biomimetic systems become transparent and colorless. Meanwhile, the isotropic liquid crystal droplets tend to become spherical, causing volume contraction along the film plane and volume dilation in the perpendicular direction. The internal strain combined with the gradient distribution of the oblate isotropic liquid crystal droplets result in corresponding shape transformations. The camouflage of a biomimetic octopus and the blossom of a biomimetic flower, both of which show synergetic color and shape responses, are demonstrated to inspire the design of functional materials and intelligent devices.

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“…Resins [65], functionalized PCL [66], functionalized PLA [67], polyurethan, wax [48], DiAPLEX [68], other polymers [69,70] Magnetization Elastomers [71][72][73], resin [74], SMP (DiAPLEX [68], other [74]), low melting point alloy (LMPA) (Cerrolow 117) [75], magnet [75,76], magnetic particles [68,[71][72][73][74] Liquid Crystal (LC) LCE [77][78][79][80][81][82][83][84], LCN [85][86][87] Dielectric Elastomer Actuator (DEA) Elastomers [88], LCE [89], polyethylene [90] Twisted and Coiled Polymer (TCP) Nylon 6,6 [91][92][93], polyethylene [91] Ionic Polymer Metal Composite (IPMC)…”

Section: Shape Memory Polymer (Smp)mentioning

confidence: 99%

Programmable Stimuli-Responsive Actuators for Complex Motions in Soft Robotics: Concept, Design and Challenges

et al. 2020

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During the last years, great progress was made in material science in terms of concept, design and fabrication of new composite materials with conferred properties and desired functionalities. The scientific community paid particular interest to active soft materials, such as soft actuators, for their potential as transducers responding to various stimuli aiming to produce mechanical work. Inspired by this, materials engineers today are developing multidisciplinary approaches to produce new active matters, focusing on the kinematics allowed by the material itself more than on the possibilities offered by its design. Traditionally, more complex motions beyond pure elongation and bending are addressed by the robotics community. The present review targets encompassing and rationalizing a framework which will help a wider scientific audience to understand, sort and design future soft actuators and methods enabling complex motions. Special attention is devoted to recent progress in developing innovative stimulus-responsive materials and approaches for complex motion programming for soft robotics. In this context, a challenging overview of the new materials as well as their classification and comparison (performances and characteristics) are proposed. In addition, the great potential of soft transducers are outlined in terms of kinematic capabilities, illustrated by the related application. Guidelines are provided to design actuators and to integrate asymmetry enabling motions along any of the six basic degrees of freedom (translations and rotations), and strategies towards the programming of more complex motions are discussed. As a final note, a series of manufacturing methods are described and compared, from molding to 3D and 4D printing. The review ends with a Perspectives section, from material science and microrobotic points of view, on the soft materials’ future and close future challenges to be overcome.

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Biomimetic Shape–Color Double‐Responsive 4D Printing

Cited by 82 publications

References 34 publications

3D printing of shape memory polymers

3D printing of shape memory polymers

3D‐Printed Biomimetic Systems with Synergetic Color and Shape Responses Based on Oblate Cholesteric Liquid Crystal Droplets

Programmable Stimuli-Responsive Actuators for Complex Motions in Soft Robotics: Concept, Design and Challenges

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