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Like the water responsive shape memory (SM) effect of β-keratin bird feathers, α-keratin hairs either existing broadly in nature are found responsive to many types of coupled stimuli in SM behaviors. In this article, α-keratin hairs were investigated for the combined stimuli of thermo-solvent, solvent-solvent, and UV (radiation)-reductant sensitive SM abilities. The related netpoints and Stimuli-responsive shape-memory materials are a category of fascinating smart materials, which undergo reversible shape transformation with environmental changes. Among a large number of stimuli-responsive shape-memory materials, light-driven materials have sparked tremendous attention because of their stability, remote operability and environmentally friendly. Smart polymers (SPs) or stimuli-responsive polymers (SRPs) behave differently to those external stimuli, as their behavior is more rapid and nonlinear in nature and even a small magnitude of external stimulus can cause noticeable changes in their shape, size, color or conductivity. The emerging 4D printing techniques open new horizons for fabricating self-actuated deformable objects by combing strength of 3D printing and stimuli-responsive shape memory materials.

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Shape Memory Polymer are rubbery in nature, composed of long , entangled-polymer chains and these chains gets stretched under tension to accommodate the deformation. Subjecting the shapeless states to counter stimuli restores the dissociated bridges, and regenerates the original shape of the hydrogels. By the cyclic dissociation and reassembly of the stimuli-responsive bridges, the reversible switchable transitions of the hydrogels between stiff shaped hydrogel structures and soft shapeless states are demonstrated. Like the water responsive shape memory (SM) effect of β-keratin bird feathers, α-keratin hairs either existing broadly in nature are found responsive to many types of coupled stimuli in SM behaviors. In this article, α-keratin hairs were investigated for the combined stimuli of thermo-solvent, solvent-solvent, and UV (radiation)-reductant sensitive SM abilities. The related netpoints and For an explanation of the science behind this material, watch: https://www.youtube.com/watch?v=2DE3D9SLev8Elastic materials are a common part of the everyday The emerging 4D printing techniques open new horizons for fabricating self-actuated deformable objects by combing strength of 3D printing and stimuli-responsive shape memory materials. This work focuses on designing self-actuated deformable solids for 4D printing such that a solid can be programmed into a temporary shape and later recovers to its original shape after heating.

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The past decade has witnessed remarkable advances in stimuli-responsive shape memory polymers (SMPs) with potential applications in biomedical devices, aerospace, textiles, civil engineering The shape of the fibers in each process, including the temporary shape for investigating the fixation ability and recovered shape for memory ability, were observed using a camera; (3) the effect of the coupled stimuli factor on the shape recovery of the fibers was observed: ①/②/③ the temporary spiral hairs encountered with water/water/reductant solution (NaHSO 3, 1 mol/L) and the shape A shape-memory adhesive has been prepared that exhibits two levels of reversible adhesion. The adhesive is a semicrystalline cross-linked polymer that contains dynamic disulfide bonds. Melting of the crystalline regions via heat causes a drop in the modulus of the material facilitating wetting of the substrate as well as enhancing the surface contact area with the substrate, which result in The shape-memory effect at the microlevel was quantified by the recovery ratio of cuboids (R r,micro), while at the nanolevel, the recovery ratio of the nanoroughness (R r,nano) was measured. The values of R r,micro could be tailored in a range from 42 ± 1% to 102 ± 1% and R r,nano from 89 ± 6% to 136 ± 21% depending on the applied compression ratio and the amount of vinyl acetate content 2019-12-30 · 4D printing is proposed based on the additive manufacturing of stimuli-responsive materials and structures, which can realize shape changing upon external stimuli.

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ISSN 1616-301X. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20201209-163844443 Stimuli Responsive Shape Memory Microarchitectures Advanced Functional Materials ( IF 16.836) Pub Date : 2020-12-08, DOI: 10.1002/adfm.202008380 Luizetta V. Elliott, Erika E. Salzman, Julia R. Greer Shape memory polymers (SMPs) respond to heat by generating programmable movement in devices that require substantial deformation and operate at transient temperatures, including stents and in all areas of human life. Stimuli-responsive shape.

Upon exposure to an external stimulus, e.g. an increase in temperature, they have the capability of changing their shape. The shape‐memory effect results from the polymer's structure and morphol 2019-10-18 2020-10-20 Optimization Shape-Memory Situations of a Stimulus Responsive Composite Material Polymers (Basel). 2021 Feb 25;13(5):697. doi: 10.3390/polym13050697. Shape memory polymers (SMPs) are materials that can undergo programmable shape change in response to a specific stimulus.
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In addition, CMC hydrogels crosslinked by donor–acceptor complexes and K + ‐stabilized G‐quadruplexes reveal stimuli‐responsive properties that exhibit dually triggered stiffness functions. 2016-04-25 · Here we demonstrate a new reversible shape-changing component design concept enabled by 3D printing two stimuli responsive polymers—shape memory polymers and hydrogels—in prescribed 3D Stimulus-responsive materials are categorized into two types: (1) shape-changing materials which change shape whenever a stimulus is employed, and return to their original shape upon removal of the stimulus [13,17,18,19,21,23] and (2) shape-memory materials which require a programming step, during which a sample is first deformed by an external force and then fixed in a temporary shape by a 2016-12-07 · Shape memory polymer (SMP) is a genre of smart materials which demonstrate a capability to fix in the temporarily programed shape and to recover the original shape upon exposure to external stimuli. Such unique and amazing properties of SMPs are applied to develop smart textiles by incorporating SMP into the fabric. Various types of stimuli-responsive SMPs such as thermal, light, pH, and In this work, we reported a multi-responsive luminescent hydrogel with properties of encryption, naked eye sensing of glucose, shape memory, self-healing, and antibacterial activity.

Here, a series of poly(l-lactide)-poly(tetramethylene oxide) glycol copolymers (PLA-PTMEG-A) is prepared by selected dangling photoresponsive anthracene moieties on the crystalline PTMEG backbone.
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Various shape memory effects of stimuli-responsive shape memory polymers Harper Meng, Habib Mohamadian, Michael Stubblefield et al.-Development of shape memory polyurethane fiber with complete shape recoverability Yong Zhu, Jinlian Hu, Lap-Yan Yeung et al.-Effect of steaming on shape memory polyurethane fibers with various hard segmentcontents 2020-11-05 · Herein, we prepared a series of smart fluorescent hydrogels with multi-stimuli responsive fluorescence, shape memory and self-healing properties, and explored their ability in constructing different multistage data encryption platforms. As shown in Fig. 1, the hydrogels were constituted by two physical cross-linked networks. 2019-01-09 · Recovery of the original shape can then be triggered only by an external stimulus. Shape-memory polymers are highly deformable materials that can be programmed to recover a memorized shape in 2020-01-01 · Physical stimuli-responsive materials Temperature-responsive materials: Temperature is the most frequently used physical stimulus to achieve shape-transformation in bioprinted structures,,. A series of thermoresponsive materials have been developed based on the mechanism of thermal gelation. The past decade has witnessed remarkable advances in stimuli-responsive shape memory polymers (SMPs) with potential applications in biomedical devices, aerospace, textiles, civil engineering The shape of the fibers in each process, including the temporary shape for investigating the fixation ability and recovered shape for memory ability, were observed using a camera; (3) the effect of the coupled stimuli factor on the shape recovery of the fibers was observed: ①/②/③ the temporary spiral hairs encountered with water/water/reductant solution (NaHSO 3, 1 mol/L) and the shape A shape-memory adhesive has been prepared that exhibits two levels of reversible adhesion.

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Advanced Functional Materials. ISSN 1616-301X. Lightweight, micro-architected composite SMPs may overcome these size limitations and offer the ability to combine functional properties (e.g., electrical conductivity) with shape memory behavior. Stimulus-responsive materials are categorized into two types: (1) shape-changing materials which change shape whenever a stimulus is employed, and return to their original shape upon removal of The tunable microarchitectured shape memory triboelectric nanogenerators (mSM-TENG) exhibit self-restoring ability in both macro shape and micro morphology, while attaining enhanced and alterable triboelectric output (∼150–320 V, ∼2.5–4 μA cm−2) due to increased frictional effects enabled by the high surface roughness. Shape memory polymers (SMPs) are smart and adaptive materials able to recover their shape through an external stimulus. This functionality, combined with the good biocompatibility of polymers, has garnered much interest for biomedical applications.

2016-12-07 · Shape memory polymer (SMP) is a genre of smart materials which demonstrate a capability to fix in the temporarily programed shape and to recover the original shape upon exposure to external stimuli. Such unique and amazing properties of SMPs are applied to develop smart textiles by incorporating SMP into the fabric.