Stimulus-responsive shape memory materials: A review

Sun, Li; Huang, Wei; Ding, Zheng; Zhao, Yong; Wang, Chang Chun; Purnawali, Hendra; Tang, Cheng

doi:10.1016/j.matdes.2011.04.065

Cited by 955 publications

(628 citation statements)

References 449 publications

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“…9(d) and (g)). The large strain originates from de-twinning or rotation of unfavored monoclinic variants into a strainaccommodating favored one, similarly to the shape memory behaviors observed in alloys [33,34].…”

Section: High Temperature Shape Memory Effectmentioning

confidence: 73%

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Zeng

Tamura

et al. 2017

Acta Materialia

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Shape memory effect (SME) High temperature deformation High temperature shape memory ceramics a b s t r a c t Recently, the shape memory effect with significant recoverable shape deformation has been discovered in small volume single-crystal zirconia. The application potential for such shape memory ceramics has spurred in-depth exploration of the martensitic transformation crystallography and high temperature shape memory effect. In this work, the martensitic transformation of micron-sized zirconia has been studied in both a pristine as-produced condition and after micromechanical compression, using synchrotron scanning micro X-ray diffraction (mXRD). The pristine zirconia was found to transform into the monoclinic phase via a different crystallographic path than the compressed zirconia, resulting in distinct monoclinic variant preferences. The characteristic martensitic transformation temperatures were also found to be higher after uniaxial compression than in the pristine condition. Such observations provide insight on the differences between stress-induced and thermally-induced martensitic transformation. Moreover, we have observed a full cycle of the shape memory effect with large recoverable strain (7%) in micron-sized zirconia at a temperature of 400 C. Our findings provide an important guideline to tailor the high-temperature shape memory properties of zirconia for further scientific research and engineering applications.

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Section: High Temperature Shape Memory Effectmentioning

confidence: 73%

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Zeng

Tamura

et al. 2017

Acta Materialia

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“…When an environmental stimulus is applied, the SMP could either provide recovery stresses or return to their permanent shapes, depending on whether or not the external loads still exist, namely the constrained or free recovery condition [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] . Since SMPs can sense the environmental changes and then take reactions in a predetermined sequence with deformation, they are considered as a promising alternative for the future's spontaneous shape changing and tunable components in various applications such as microelectromechanical systems, surface patterning, biomedical devices, aerospace deployable structures and morphing structures [31][32][33][34][35][36][37][38][39] .…”

mentioning

confidence: 99%

Reduced time as a unified parameter determining fixity and free recovery of shape memory polymers

2014

Nat Commun

235

179

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Shape memory polymers are at the forefront of recent materials research. Although the basic concept has been known for decades, recent advances in the research of shape memory polymers demand a unified approach to predict the shape memory performance under different thermo-temporal conditions. Here we report such an approach to predict the shape fixity and free recovery of thermo-rheologically simple shape memory polymers. The results show that the influence of programming conditions to free recovery can be unified by a reduced programming time that uniquely determines shape fixity, which consequently uniquely determines the shape recovery with a reduced recovery time. Furthermore, using the time-temperature superposition principle, shape recoveries under different thermo-temporal conditions can be extracted from the shape recovery under the reduced recovery time. Finally, a shape memory performance map is constructed based on a few simple standard polymer rheology tests to characterize the shape memory performance of the polymer.

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“…SMHs are made of conventional materials which do not feature any memory effect individually, where one domain is always elastic while the other one (transition domain) is able to change its stiffness upon stimulation. Recently, Sun and coworkers [203] published a detailed review of stimulus-responsive SMMs and their applications as sensors and actuators. However, most of the applications reported so far can be assigned to the biomedical field for minimally invasive surgery, to the development of micro vehicles, deployable structures and morphing wings, and to systems for energy harvesting.…”

Section: Shape-memory Polymersmentioning

confidence: 99%

“…Though all of these concepts were realized with SMAs that are-at least in part-already commercially available, they can in principle also be fabricated by employing SMPs. Using SMPs rather than SMAs in microfluidics has several advantages [203]: For example, the raw material and processing costs are lower, the recoverable strain is typically an order of magnitude greater, the thermomechanical properties can be customized easily, they can be designed to be transparent, electrically conductive or magnetic, many of them are biocompatible and chemically stable, possible stimuli include heat, moisture, solvent or pH changes and light, and they can be actuated by more than one type of stimulus. Only recently has 3D printing of shape-memory polymers been demonstrated [208].…”

Section: Shape-memory Polymersmentioning

confidence: 99%

Stimulus-active polymer actuators for next-generation microfluidic devices

Hilber

2016

Appl. Phys. A

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Microfluidic devices have not yet evolved into commercial off-the-shelf products. Although highly integrated microfluidic structures, also known as lab-on-a-chip (LOC) and micrototal-analysis-system (lTAS) devices, have consistently been predicted to revolutionize biomedical assays and chemical synthesis, they have not entered the market as expected. Studies have identified a lack of standardization and integration as the main obstacles to commercial breakthrough. Soft microfluidics, the utilization of a broad spectrum of soft materials (i.e., polymers) for realization of microfluidic components, will make a significant contribution to the proclaimed growth of the LOC market. Recent advances in polymer science developing novel stimulus-active soft-matter materials may further increase the popularity and spreading of soft microfluidics. Stimulus-active polymers and composite materials change shape or exert mechanical force on surrounding fluids in response to electric, magnetic, light, thermal, or water/solvent stimuli. Specifically devised actuators based on these materials may have the potential to facilitate integration significantly and hence increase the operational advantage for the end-user while retaining costeffectiveness and ease of fabrication. This review gives an overview of available actuation concepts that are based on functional polymers and points out promising concepts and trends that may have the potential to promote the commercial success of microfluidics.

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Stimulus-responsive shape memory materials: A review

Cited by 955 publications

References 449 publications

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Reduced time as a unified parameter determining fixity and free recovery of shape memory polymers

Stimulus-active polymer actuators for next-generation microfluidic devices

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