Topic
Smart material
About: Smart material is a research topic. Over the lifetime, 3704 publications have been published within this topic receiving 74280 citations. The topic is also known as: intelligent material & responsive material.
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TL;DR: In this paper, the shape memory alloys (SMAs) are employed in a variety of emerging applications, and may potentially be used to avoid traditionally voluminous and heavy prosthetic actuators.
Abstract: Shape memory alloys (SMAs) are a class of smart material having the unique ability to return to a predefined shape when heated. These materials are employed in a variety of emerging applications, and may potentially be used to avoid traditionally voluminous and heavy prosthetic actuators. The primary focus of this article is to convey the design and evaluation of a compact, lightweight, and high-strain SMA ribbon-based artificial muscle for use in such biomimetic applications. A key factor in the design of such an actuator is a thorough understanding of the thermomechanical response of the shape memory material. As such, a review of the relevant constitutive models is included. A selected hysteresis model is evaluated for potential application to ribbon type elements. The proposed actuator achieves strains of 31.6%; a marked improvement over previously documented SMA-based actuators.
19 citations
Proceedings Article•
11 Apr 2011TL;DR: New smart material technologies, namely electro-active polymers and shape memory alloy actuators, are presented as potential candidates to implement mechanically reconfigurable antennas, including the advantages and disadvantages for the antenna applications.
Abstract: Mechanically reconfigurable antennas have the potential to provide a large range of antenna reconfiguration and to have a lower cost than other reconfigurable technologies. Solid state devices in the RF signal path can cause distortion and power limiting, but such issues can be averted by keeping them out of the direct RF signal path. In this paper, new smart material technologies, namely electro-active polymers and shape memory alloy actuators, are presented as potential candidates to implement mechanically reconfigurable antennas. A review of some proof-of-concept reconfigurable antenna prototypes using these technologies is presented, including the advantages and disadvantages for the antenna applications.
19 citations
TL;DR: In this article, a photonic hydrogel is proposed to detect SCN− ions quantitatively and selectively in water through the ion-specific deswelling behavior of hydrogels and corresponding changes in the wavelength of the diffraction peak.
Abstract: Embedded photonic crystal hydrogels and responsive photonic crystal microspheres that can change structural color as a result of external stimuli have shown great potential for various applications, but their practical applications have been greatly limited due to the poor mechanical properties of hydrogel materials and their sometimes unideal optical properties. Although some progress has been achieved, it is still a challenge to develop photonic crystal hydrogel materials with the desired mechanical properties and structural color. Inspired by the excellent mechanical properties of polyurethane, this article presents a novel smart composite material, which combines nonionic UV-curable polyurethane and cross-linked polystyrene-co-poly(N-isopropylacrylamide) (PS-co-PNIPAM) microspheres for the first time. This photonic hydrogel demonstrates the desired optical properties and a narrow reflection peak half-width, while the tensile strength of the cured elastomers changes between 0.1 MPa and 0.43 MPa when the swelling ratio is changed; this multifunctional material can recover from deformation to its original size quickly. As proof-of-concept, SCN− was selected as a target analyte. A hydrogel sensor enables the detection of SCN− ions quantitatively and selectively in water through the ion-specific deswelling behavior of hydrogels (the Hofmeister series principle) and corresponding changes in the wavelength of the diffraction peak; the limit of detection is 5 μM. Our strategy is a straightforward way to design simple smart materials whose response and mechanical properties can be tuned through the judicious choice of the hydrophilic group type and content, extending the potential application of photonic hydrogels.
19 citations
TL;DR: In this article, an Anthracene-terminated photo/thermo dual-response polyurethane was prepared as a dynamic substrate whose wrinkled structure could appear and disappear reversibly through dimerization and depolymerisation of the anthracene groups.
19 citations
Posted Content•
TL;DR: In this article, the authors examined the impact of embedding on the temperature-dependent response of fiber Bragg gratings and found that the impact on the structural integrity of the material was minimal.
Abstract: In recent years there has been considerable interest in utilizing embedded fiber optic based sensors for fabricating smart materials. One of the primary motivations is to provide real-time information on the structural integrity of the material so as to enable proactive actions that prevent catastrophic failure. In this preliminary study we have examined the impact of embedding on the temperature-dependent response of fiber Bragg gratings.
19 citations