A bioinspired reversible snapping hydrogel assembly

Zhao, Qian; Yang, Xuxu; Ma, Chunxin; Chen, Di; Bai, Hao; Li, Tiefeng; Yang, Wei; Xie, Tao

doi:10.1039/c6mh00167j

Cited by 108 publications

(84 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ingenious use of trichomes as mechanosensors transducing an external mechanical stimulus into a specific mechanical movement of the structure has not yet been replicated in engineering. Researchers have so far managed to use environmental changes such as pH and temperature to snap between shapes [ 34 ] or light to trigger the snapping motion of a micro-gripper made of a liquid crystal elastomer [ 35 ].…”

Section: Flexibilitymentioning

confidence: 99%

Design principles of hair-like structures as biological machines

Seale

Cummins

Viola

et al. 2018

J. R. Soc. Interface.

View full text Add to dashboard Cite

Hair-like structures are prevalent throughout biology and frequently act to sense or alter interactions with an organism's environment. The overall shape of a hair is simple: a long, filamentous object that protrudes from the surface of an organism. This basic design, however, can confer a wide range of functions, owing largely to the flexibility and large surface area that it usually possesses. From this simple structural basis, small changes in geometry, such as diameter, curvature and inter-hair spacing, can have considerable effects on mechanical properties, allowing functions such as mechanosensing, attachment, movement and protection. Here, we explore how passive features of hair-like structures, both individually and within arrays, enable diverse functions across biology. Understanding the relationships between form and function can provide biologists with an appreciation for the constraints and possibilities on hair-like structures. Additionally, such structures have already been used in biomimetic engineering with applications in sensing, water capture and adhesion. By examining hairs as a functional mechanical unit, geometry and arrangement can be rationally designed to generate new engineering devices and ideas.

show abstract

Section: Flexibilitymentioning

confidence: 99%

Design principles of hair-like structures as biological machines

Seale

Cummins

Viola

et al. 2018

J. R. Soc. Interface.

View full text Add to dashboard Cite

show abstract

“…Likewise, the biomimetic 3D printing can also be used to fabricate shape‐shifting structure. Besides the simple and continuous shape shifting by previous 4D printing, more complicated and noncontinuous shape shifting (snapping) can also be expected by 4D printing . It should be noted that the above‐mentioned complex shape changing usually relies on both the development of the biomimetic structure replication and the usage of functional smart materials.…”

Section: Perspective and Outlookmentioning

confidence: 98%

Advances in 4D Printing: Materials and Applications

Xiao

Roach

et al. 2018

Adv Funct Materials

741

436

View full text Add to dashboard Cite

4D printing has attracted tremendous interest since its first conceptualization in 2013. 4D printing derived from the fast growth and interdisciplinary research of smart materials, 3D printer, and design. Compared with the static objects created by 3D printing, 4D printing allows a 3D printed structure to change its configuration or function with time in response to external stimuli such as temperature, light, water, etc., which makes 3D printing alive. Herein, the material systems used in 4D printing are reviewed, with emphasis on mechanisms and potential applications. After a brief overview of the definition, history, and basic elements of 4D printing, the state‐of‐the‐art advances in 4D printing for shape‐shifting materials are reviewed in detail. Both single material and multiple materials using different mechanisms for shape changing are summarized. In addition, 4D printing of multifunctional materials, such as 4D bioprinting, is briefly introduced. Finally, the trend of 4D printing and the perspectives for this exciting new field are highlighted.

show abstract

“…Shape morphing is ubiquitous in nature, where bean pods, pine cones, wheat awns, and flytrap, to name a few, exhibit programmed deformations under external stimuli . Inspired by these natural systems, there have been extensive efforts to realize controllable deformations using synthetic soft materials due to their promising applications in biomedical devices, soft actuators, etc . Representative deformations including bending, folding, and twisting have been realized by controlling the gradient structures within materials .…”

Section: Introductionmentioning

confidence: 99%

Programmed Deformations of 3D‐Printed Tough Physical Hydrogels with High Response Speed and Large Output Force

Zheng

Shen

Zhu

et al. 2018

Adv Funct Materials

196

175

View full text Add to dashboard Cite

Shape-morphing hydrogels have emerging applications in biomedical devices, soft robotics, and so on. However, successful applications require a combination of excellent mechanical properties and fast responding speed, which are usually a trade-off in hydrogel-based devices. Here, a facile approach to fabricate 3D gel constructs by extrusion-based printing of tough physical hydrogels, which show programmable deformations with high response speed and large output force, is described. Highly viscoelastic poly(acrylic acid-coacrylamide) (P(AAc-co-AAm)) and poly(acrylic acid-co-N-isopropyl acrylamide) (P(AAc-co-NIPAm)) solutions or their mixtures are printed into 3D constructs by using multiple nozzles, which are then transferred into FeCl 3 solution to gel the structures by forming robust carboxyl-Fe 3+ coordination complexes. The printed gel fibers containing poly(N-isopropyl acrylamide) segment exhibit considerable volume contraction in concentrated saline solution, whereas the P(AAc-co-AAm) ones do not contract. The mismatch in responsiveness of the gel fibers affords the integrated 3D gel constructs the shapemorphing ability. Because of the small diameter of gel fibers, the printed gel structures deform and recover with a fast speed. A four-armed gripper is designed to clamp plastic balls with considerable holding force, as large as 115 times the weight of the gripper. This strategy should be applicable to other tough hydrogels and broaden their applications.

show abstract

A bioinspired reversible snapping hydrogel assembly

Cited by 108 publications

References 26 publications

Design principles of hair-like structures as biological machines

Design principles of hair-like structures as biological machines

Advances in 4D Printing: Materials and Applications

Programmed Deformations of 3D‐Printed Tough Physical Hydrogels with High Response Speed and Large Output Force

Contact Info

Product

Resources

About