Nanotube fibers for electromechanical and shape memory actuators

Viry, Lucie; Mercader, Célia; Miaudet, Pierre; Zakri, Cécile; Derré, Alain; Kuhn, Alexander; Maugey, Maryse; Poulin, Philippe

doi:10.1039/b924430a

Cited by 66 publications

(66 citation statements)

References 51 publications

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“…Motivated by these studies, here we investigate the critical Casimir interaction between a cylindrical colloidal particle and a chemically striped substrate. Highly elliptical and (sphero-) cylindrical colloids are widely used in present research and may have applications in new materials [45,46]. A diverse set of elongated particles such as cylindrical micelles [47], block copolymers [48], the mosaic tobacco virus [49], and carbon nanotubes [50,51] is experimentally available.…”

Section: Dashed Lines) the Center Of The Colloid Is Located At (A Anmentioning

confidence: 99%

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

et al. 2014

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Recent experiments have demonstrated a fluctuation-induced lateral trapping of spherical colloidal particles immersed in a binary liquid mixture near its critical demixing point and exposed to chemically patterned substrates. Inspired by these experiments, we study this kind of effective interaction, known as the critical Casimir effect, for elongated colloids of cylindrical shape. This adds orientational degrees of freedom. When the colloidal particles are close to a chemically structured substrate, a critical Casimir torque acting on the colloids emerges. We calculate this torque on the basis of the Derjaguin approximation. The range of validity of the latter is assessed via mean-field theory. This assessment shows that the Derjaguin approximation is reliable in experimentally relevant regimes, so that we extend it to Janus particles endowed with opposing adsorption preferences. Our analysis indicates that critical Casimir interactions are capable of achieving well-defined, reversible alignments both of chemically homogeneous and of Janus cylinders.

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Section: Dashed Lines) the Center Of The Colloid Is Located At (A Anmentioning

confidence: 99%

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

et al. 2014

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“…These features encourage scientists to explore their applications in energy storage devices such as supercapacitors. Previous studies on capacitive performance of CNT fibers mainly focused on composite fibers or fibers spun from CNT dispersions [9,19,21]. Only a few papers reported the capacitive properties of pure CNT fibers or fiber-equivalent "CNT solid" [4,20], which are directly originated from vertically aligned CNT arrays without any chemical treatments and have high potentials to preserve CNT's capacitive properties without compromising CNT's electrical and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Super strong, tough, and stiff CNT fibers with low mass density and good electrical conductivity have been successfully fabricated [9][10][11][12][13][14][15][16][17][18]. Electrochemical properties of CNT fibers have also been studied, and the electrochemical actuation has been achieved [19,20]. In addition, CNT fibers are very flexible and thus could allow us to fabricate them into any shape, such as unidirectional films, woven mats, or muscle-like bundles, to meet the specific application requirements.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical capacitive properties of CNT fibers spun from vertically aligned CNT arrays

Sun

Zhou

et al. 2011

J Solid State Electrochem

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Due to their lightweight, large surface area; excellent electrical conductivity; and mechanical strength, carbon nanotube (CNT) fibers show great potentials in serving as both electrode materials and current collectors in supercapacitors. In this paper, the capacitive properties of both asspun CNT fibers and electrochemically activated CNT fibers have been investigated using cyclic voltammetry and electrochemical impedance spectroscopy. It is found that the as-spun CNT fibers exhibit a very low specific capacitance of 2.6 Fg −1 , but electrochemically activated CNT fibers show considerably improved specific capacitance. The electrochemical activation has been realized by cyclic scanning in a wide potential window. Different electrolytes have also been examined to validate the applicability of our carbon materials and the activation mechanism. It is believed that such an activation process can significantly improve the surface wetting of the CNT fibers by electrolyte (aqueous Na 2 SO 4 solution). The cycling stability and rate-dependence of the capacitance have been studied, and the results suggest practical applications of CNT fibers in electrochemical supercapacitors.

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“…Besides torsional actuators, linear actuators made of aligned CNTFs have also been demonstrated. They exhibit better properties than bucky papers because of the good alignment of CNTs [100,101]. However, not limited to actuators, for any applications in which deformation is involved, creep and stress relaxations are often a critical weakness of carbon nanomaterial-based microfibers, which originates from the fact that CNT and graphene are generally assembled without being bound [102,103].…”

Section: Actuatorsmentioning

confidence: 99%

Microfiber devices based on carbon materials

2015

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Microfiber devices are able to extend the micro/nano functionalities of materials or devices to the macroscopic scale with excellent flexibility and weavability, promising a variety of unique applications and, sometimes, also improved performance as compared with bulk counterparts. The fiber electrodes in these devices are often made of carbon materials (e.g. carbon nanotubes and graphene) because of their exceptional electrical, mechanical, and structural properties. Covering the latest developments and aiming to stimulate more exciting applications, we comprehensively review the preparation and applications of carbon-microfiber devices on energy conversion and storage, electronics, sensors and actuators.

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Nanotube fibers for electromechanical and shape memory actuators

Cited by 66 publications

References 51 publications

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

Electrochemical capacitive properties of CNT fibers spun from vertically aligned CNT arrays

Microfiber devices based on carbon materials

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