Actuating and memorizing bilayer hydrogels for a self-deformed shape memory function

Wang, Li; Jian, Yukun; Le, Xiaoxia; Lü, Wei; Ma, Chunxin; Zhang, Jiawei; Huang, Youju; Huang, Chih‐Feng; Chen, Tao

doi:10.1039/c7cc09456f

Cited by 101 publications

(67 citation statements)

References 35 publications

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“…For example, a bilayer shape memory hydrogel has been fabricated within a thermo-responsive actuating layer and a pH-responsive memorizing layer. 54 In the system, one layer made of PNIPAM hydrogel shrank at higher temperature, leading to the self-deformation of the whole hydrogel. After that, the other layer containing chitosan could form micro-crystals for stabilizing temporary shapes when soaking in base solution.…”

Section: Smhs With Thermoplasticitymentioning

confidence: 99%

Trends in polymeric shape memory hydrogels and hydrogel actuators

et al. 2019

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Section: Smhs With Thermoplasticitymentioning

confidence: 99%

Trends in polymeric shape memory hydrogels and hydrogel actuators

et al. 2019

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“…The hydrogels are typically layered by spin coating, drop‐casting or nozzle printing, which afford control over the thickness of the layers. Researchers combine two or more hydrogel layers with different mechanical and swelling properties in a spatially predefined sequence and orientation . An example is the pairing of an active soft hydrogel layer capable of swelling with a relatively stiff passive layer with relatively nonswelling characteristics .…”

Section: Principlesmentioning

confidence: 99%

Transformer Hydrogels: A Review

Erol

Pantula

Liu

et al. 2019

Adv Materials Technologies

221

211

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Hydrogels, which are hydrophilic soft porous networks, are an important class of materials of broad relevance to bioanalytical chemistry, soft‐robotics, drug delivery, and regenerative medicine. Transformer hydrogels are micro‐ and mesostructured hydrogels that display a dramatic transformation of shape, form, or dimension with associated changes in function, due to engineered local variations such as in swelling or stiffness, in response to external controls or environmental stimuli. This review describes principles that can be utilized to fabricate transformer hydrogels such as by layering, patterning, or generating anisotropy, and gradients. Transformer hydrogels are classified based on their responsivity to different stimuli such as temperature, electromagnetic fields, chemicals, and biomolecules. A survey of the current research progress suggests applications of transformer hydrogels in biomimetics, soft robotics, microfluidics, tissue engineering, drug delivery, surgery, and biomedical engineering.

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“…The recovery and response time of the sample ( h = ≈36 µm) was 24 and 22 s, respectively, which was shorter than that of the sample with h of ≈55 µm (Figure a,b). The actuation time of actuator fabricated in this paper was much faster than that of the previous hydrogels responding to thermal and solvent stimuli (Figure c and Table S1, Supporting Information) . The x ‐axis in Figure c represents the recovery time versus response time, and the y‐axis represents the reciprocal of the sum of response and recovery time for one cycle.…”

Section: Resultsmentioning

confidence: 92%

Direct‐Ink Written Shape‐Morphing Film with Rapid and Programmable Multimotion

Mao

Zhu

Pan

et al. 2020

Adv Materials Technologies

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Shape‐morphing structures are appealing in the material community to inspire a myriad of applications across domains, including soft robots, tissue engineering, and consumer products. However, it is a challenge to create fast response/recovery actuators with complicated and robust deformation due to the slow diffusion speed of water in hydrogel and small modulus of hydrogel. Herein, a facile strategy is proposed to fabricate a versatile patterned film configuration using chitin and poly(dimethylsiloxane) (PDMS). The direct‐ink writing (DIW) technique is leveraged to build simple, flat, patterned films, which can be morphed into complicated multidimensional architectures. Additionally, computational simulations are conducted to predict the deformation behaviors of the actuator. The sequential response structure can be precisely manipulated by the actuation speed of different structures. Moreover, an assembling method is proposed to create multifunction actuators.

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Actuating and memorizing bilayer hydrogels for a self-deformed shape memory function

Cited by 101 publications

References 35 publications

Trends in polymeric shape memory hydrogels and hydrogel actuators

Trends in polymeric shape memory hydrogels and hydrogel actuators

Transformer Hydrogels: A Review

Direct‐Ink Written Shape‐Morphing Film with Rapid and Programmable Multimotion

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