Programming temporal shapeshifting

Hu, Xiaobo; Zhou, Jing; Vatankhah-Varnosfaderani, Mohammad; Daniel, William F. M.; Li, Qiaoxi; Zhushma, Aleksandr P.; Dobrynin, Andrey V.; Sheiko, Sergei S.

doi:10.1038/ncomms12919

Cited by 84 publications

(78 citation statements)

References 37 publications

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“…For the shape memory hydrogels, the special circumstance is that the plenty of water inside promotes the motion of polymer chains and weakens the fixation for the temporary shape. The temporary shape is recovered to the original (permanent) shape induced by some external stimuli, which promises the shape memory hydrogels potential applications in soft actuators, such as smart valves for flow control, sequential “blooming” of artificial flowers, and cell encapsulating and detaching. [3d,e] However, all of these actuations are one‐off and the original shape cannot convert to the temporary shape spontaneously and reversibly .…”

Section: Introductionmentioning

confidence: 99%

Polyampholyte Hydrogels with pH Modulated Shape Memory and Spontaneous Actuation

Zhang

Liao

Wang

et al. 2018

Adv Funct Materials

165

133

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Polyampholyte hydrogels are synthesized by one-step copolymerization of cationic monomer 3-(methacryloylamino)propyltrimethylammonium chloride, anionic monomers sodium p-styrenesulfonate (NaSS), and methacrylic acid (MAA) without chemical crosslinker and adding salts. The hydrogels exhibit pH responsive shape memory behavior; the temporary shape of the hydrogel is formed manually after immersing in NaOH solution and fixed in HCl solution, while the shape recovery occurs by immersing in NaOH again. Most interestingly, the hydrogel shows a spontaneous shape change after the first shape memory cycle. When the recovered hydrogel with a little residual deformation is immersed in HCl again, it twists spontaneously and rapidly to the previous temporary shape. The spontaneous twisting and recovering can be repeated for ten times. Furthermore, the hydrogel swells quickly and is strengthened in HCl, while shrinks and weakens in NaOH during the shape change procedure. This unique synergistic effect of fast swelling, residual helical deformation, and increased strength plays a significant role in the spontaneous shape alternation. This new finding will initiate a new prosperous design for new soft actuators requiring successive actions.

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Section: Introductionmentioning

confidence: 99%

Polyampholyte Hydrogels with pH Modulated Shape Memory and Spontaneous Actuation

Zhang

Liao

Wang

et al. 2018

Adv Funct Materials

165

133

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“…Temporal control of shape changes has, to this point, been primarily achieved through the use of external stimuli. Autonomous activation of SMMs, with predetermined rates of activation, has the potential for use in drug delivery systems, actuators, and dynamic surfaces for driving cell fates, and merging this concept with BSMPs could lead to simplifying current treatment modalities which could decrease medical costs and improve patient outcomes.…”

Section: Future and Outlookmentioning

confidence: 99%

Biodegradable Shape Memory Polymers in Medicine

Peterson

Dobrynin

Becker

2017

Adv Healthcare Materials

Self Cite

157

155

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Shape memory materials have emerged as an important class of materials in medicine due to their ability to change shape in response to a specific stimulus, enabling the simplification of medical procedures, use of minimally invasive techniques, and access to new treatment modalities. Shape memory polymers, in particular, are well suited for such applications given their excellent shape memory performance, tunable materials properties, minimal toxicity, and potential for biodegradation and resorption. This review provides an overview of biodegradable shape memory polymers that have been used in medical applications. The majority of biodegradable shape memory polymers are based on thermally responsive polyesters or polymers that contain hydrolyzable ester linkages. These materials have been targeted for use in applications pertaining to embolization, drug delivery, stents, tissue engineering, and wound closure. The development of biodegradable shape memory polymers with unique properties or responsiveness to novel stimuli has the potential to facilitate the optimization and development of new medical applications.

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“…Stimuli‐responsive materials capable of color, texture, pattern, and shape modulation have important implications for consumer products such as wearable sensors or flexible displays which enable communication, signaling, or the ability to camouflage. Perhaps one of the most sophisticated natural systems capable of simultaneously changing all of these parameters in response to perceived environmental cues are cephalopods (squid, octopus, cuttlefish) .…”

Section: The Cie 1976 Color Space For the Pigment Granule Films Inclmentioning

confidence: 99%

Natural Light‐Scattering Nanoparticles Enable Visible through Short‐Wave Infrared Color Modulation

Kumar

Osgood

Dinneen

et al. 2018

Advanced Optical Materials

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Color is ubiquitous in nature; however, the ability to rapidly change color in response to environmental cues is unique to few biological systems. Cephalopods are one such system; they employ a sophisticated ensemble of optical organs that assist in adaptive coloration in different environments. While these animals have been a subject of research for decades, the photophysics underlying their color modulation is still not well understood. This is especially true in the context of their pigmentary chromatophore organs, which are considered one of the active elements of coloration. This paper describes diffuse and specular scattering originating in materials made from the nanoparticles that populate the chromatophore organs and shows for the first time how a film as few as two particle layers thick (≈1 µm) contributes to over 20% forward scattering in the visible, near‐infrared, and short‐wave infrared (SWIR) regions. The intensity of scattered light across this broad spectrum increases when films or fibers containing these nanoparticles are placed above a back‐reflecting material, suggesting a tunable feature that can be controlled under different conditions. This nano‐enhanced visible through SWIR scattering may lead to better spectral purity of reflected and back‐scattered light, illustrating an important role in color and future color‐changing materials.

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Programming temporal shapeshifting

Cited by 84 publications

References 37 publications

Polyampholyte Hydrogels with pH Modulated Shape Memory and Spontaneous Actuation

Polyampholyte Hydrogels with pH Modulated Shape Memory and Spontaneous Actuation

Biodegradable Shape Memory Polymers in Medicine

Natural Light‐Scattering Nanoparticles Enable Visible through Short‐Wave Infrared Color Modulation

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