An ultra-large deformation bidirectional actuator based on a carbon nanotube/PDMS composite and a chitosan film

2019 ◽  
Vol 7 (47) ◽  
pp. 7558-7565 ◽  
Author(s):  
Hang Xu ◽  
Xiuzhu Xu ◽  
Jiawei Xu ◽  
Shengping Dai ◽  
Xu Dong ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Large Deformation ◽  
Mechanical Energy ◽  
Chitosan Film ◽  
Multiple Forms ◽  
External Stimuli

Actuating materials can convert external stimuli (humidity, light, electricity, etc.) into mechanical energy, and realize multiple forms of movements.

scholarly journals Carbon Nanotube Films for Energy Applications

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1890
Author(s):  
Monika Rdest ◽  
Dawid Janas
Keyword(s):  
Carbon Nanotube ◽  
Mechanical Energy ◽  
Research Community ◽  
Thermal Interface Materials ◽  
Thermal Interface ◽  
Conductive Coatings ◽  
Storage Devices ◽  
Energy Applications ◽  
Wide Range ◽  
Interface Materials

This perspective article describes the application opportunities of carbon nanotube (CNT) films for the energy sector. Up to date progress in this regard is illustrated with representative examples of a wide range of energy management and transformation studies employing CNT ensembles. Firstly, this paper features an overview of how such macroscopic networks from nanocarbon can be produced. Then, the capabilities for their application in specific energy-related scenarios are described. Among the highlighted cases are conductive coatings, charge storage devices, thermal interface materials, and actuators. The selected examples demonstrate how electrical, thermal, radiant, and mechanical energy can be converted from one form to another using such formulations based on CNTs. The article is concluded with a future outlook, which anticipates the next steps which the research community will take to bring these concepts closer to implementation.

Nanocomposites of Carbon Nanotube/Polyaniline with Pending Calix[8]Arene and their External Stimuli Response Properties

2017 ◽  
Vol 898 ◽  
pp. 2286-2293 ◽  
Author(s):  
Ming Jun Gao ◽  
Li Ping Li ◽  
Jian Xun Qiu ◽  
Xin Tao Zhang ◽  
Xiao Chun He ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Visible Light ◽  
Carbon Nanomaterials ◽  
Ultra Violet ◽  
Film Forming ◽  
Potential Applications ◽  
Stimuli Response ◽  
The Fourier Transform ◽  
Film Substrate ◽  
External Stimuli

To functionalize the smart nanocomposites, the nanocomposites of CNTs/polyaniline with pending calix [8] arene were prepared. A series of characterizations were performed by SEM (scanning electron microscopy), the Fourier-Transform Infrared (FTIR) spectra, The UV-Vis (Ultra-violet visible spectroscopy), et al. The photoconductivity response to visible light and 808 nm laser with low-power were studied based on interdigital electrodes of Au on flexible PET (polyethylene terephthalate) film substrate with casting method. The results showed that the nanocomposites of CNTs/polyaniline with pending calix [8] arene exhibited good photoresponse to visible light and weak 808 nm laser, but its recoverability was very slow, it needed several hours, and the film-forming property of nanocomposite was not very good. This may be attributed to the results of increased hydrophobicity of nanocomposite because of introducing the calix [8] arene ring. In order to increase the film-forming technology of nanocomposites, the grapheme oxide were obtained with unzipping method of carbon nanotube (CNTs) for enhancing the hydrophilcity of carbon nanomaterials. The nanocomposites of grapheme oxide/polyaniline with pending calix [8] arene were obtained with similar methods, which showed improved film-forming property. The photoresponses to weak visible light and 808 nm laser also showed the similar results. It may develop the nanocomposite with external stimuli response, and have good potential applications in sensors, organic photocatalyst, et al.

scholarly journals Photosalient Effect: Dramatic conversion of light into mechanical motion

2014 ◽  
Vol 70 (a1) ◽  
pp. C1224-C1224
Author(s):  
Subash Sahoo ◽  
Pance Naumov
Keyword(s):  
Single Crystals ◽  
Flexible Electronics ◽  
Mechanical Response ◽  
Mechanical Energy ◽  
Small Scale ◽  
Molecular Rotor ◽  
Mechanical Motion ◽  
Molecular Actuators ◽  
Liquid Crystal Elastomers ◽  
External Stimuli

Materials showing mechanical response in presence of external stimuli are of relevance for the design of nanoscale actuating devices for a variety of small-scale applications including actuators, flexible electronics, artificial muscles, and others. In recent years, molecular actuators[1] (molecular rotor, elevator, etc.) and several macroscopic systems based on liquid-crystal elastomers, gels, and other polymers[2] have been developed. The most recent efforts are aimed at achieving rapid, reversible, maximum and fatigueless response with single crystals which display optimum coupling between light and the mechanical energy. When exposed to light, certain single crystals can jump up to thousands times their own size. The term "photosalient" was introduced recently to describe this phenomenon.[3] The photosalient effect in the motile crystals represents a direct and visually impressive demonstration of the conversion of light into mechanical motion through a photochemical reaction on a macroscopic scale, which sets the platform for the design of fast biomimetic and technomimetic actuating materials that can mimic animal motions, dynamics of macromolecules, or dynamic technical elements, in the future. In this presentation, we will describe the mechanical response from photosalient single crystals that undergo photoinduced linkage isomerization. To understand the mechanistic details, the mechanism of the process was studied by X-ray photodiffraction, kinematic analysis, IR spectroscopy and mechanical characterization. In contrast to many other solid-state transformations that involve nucleation and propagation of the reaction interface, in this system the reaction proceeds homogeneously whereupon solid solutions form without apparent phase separation.

Largely Improved Tensile Properties of Chitosan Film via Unique Synergistic Reinforcing Effect of Carbon Nanotube and Clay

2008 ◽  
Vol 112 (13) ◽  
pp. 3876-3881 ◽  
Author(s):  
Changyu Tang ◽  
Lixue Xiang ◽  
Juanxia Su ◽  
Ke Wang ◽  
Changyue Yang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Tensile Properties ◽  
Chitosan Film ◽  
Reinforcing Effect

scholarly journals Effect of the Processing on the Resistance–Strain Response of Multiwalled Carbon Nanotube/Natural Rubber Composites for Use in Large Deformation Sensors

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1845
Author(s):  
Xingyao Liu ◽  
Rongxin Guo ◽  
Rui Li ◽  
Hui Liu ◽  
Zhengming Fan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Natural Rubber ◽  
Large Deformation ◽  
Large Strain ◽  
Deformation Monitoring ◽  
Resistance Strain ◽  
Multiwalled Carbon Nanotube ◽  
Strain Response ◽  
Multiwalled Carbon

The dispersion, electrical conductivities, mechanical properties and resistance–strain response behaviors of multiwalled carbon nanotube (MWCNT)/natural rubber (NR) composites synthesized by the different processing conditions are systematically investigated at both macro- and micro-perspectives. Compared with the solution and flocculation methods, the two roll method produced the best MWCNTs distribution since the materials are mixed by strong shear stress between the two rolls. An excellent segregated conductive network is formed and that a low percolation threshold is obtained (~1 wt.%) by the two roll method. Different from the higher increases in conductivity for the composites obtained by the solution and flocculation methods when the MWCNT content is higher than 3 wt.%, the composite prepared by the two roll method displays obvious improvements in its mechanical properties. In addition, the two roll method promotes good stability, repeatability, and durability along with an ultrahigh sensitivity (GFmax = 974.2) and a large strain range (ε = 109%). The ‘shoulder peak’ phenomenon has not been observed in the composite prepared by the two roll method, confirming its potential for application as a large deformation monitoring sensor. Moreover, a mathematical model is proposed to explain the resistance–strain sensing mechanism.

Selective recognition of atropine in biological fluids and leaves of Datura stramonium employing a carbon nanotube–chitosan film based biosensor

2018 ◽  
Vol 42 (13) ◽  
pp. 10852-10860 ◽  
Author(s):  
Suyash Mane ◽  
Rushda Narmawala ◽  
Sanghamitra Chatterjee
Keyword(s):  
Carbon Nanotube ◽  
Biological Fluids ◽  
Chitosan Film ◽  
Datura Stramonium ◽  
Selective Recognition ◽  
Ultrasensitive Detection ◽  
Complex Matrices ◽  
Electrochemical Approach

This paper demonstrates a selective, expeditious and facile electrochemical approach for the ultrasensitive detection of atropine in complex matrices.

Carbon Nanotube Interfaces for Magneto Thermoelectric Actuation

2010 ◽  
Author(s):  
Patrick T. McCarthy ◽  
Stephen L. Hodson ◽  
Timothy D. Sands ◽  
Timothy S. Fisher
Keyword(s):  
Carbon Nanotube ◽  
Thermoelectric Generator ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Ferromagnetic Phase ◽  
Thermal Interface ◽  
Photovoltaic Panel ◽  
Planar Array ◽  
Thermal Interfaces ◽  
Static Conditions

Magneto thermoelectric generator cell technology uses the ferromagnetic phase transition of gadolinium to drive the movement of a diaphragm ‘shuttle’ whose mechanical energy can be converted to electrical form and which enhances heat transfer through both conduction and convection. This paper describes the thermal behavior of gadolinium foils used in magneto thermoelectric generator cells that, in conjunction with a planar array of similar devices, would form a thermal backplane to a solar photovoltaic panel. In this scenario, the backplane operates as a self-powered cooling device that can simultaneously convert thermal energy to electrical energy as well as improve photovoltaic efficiency through active cooling. This form of energy harvesting and enhancement shows the potential of increasing the energy density of silicon photovoltaic panels. The synthesis and characterization of thermal interfaces applied to the gadolinium shuttles and hot/cold substrates are described. Carbon nanotube arrays are implemented as the thermal interfaces, and their performance under static conditions is assessed. Optimization of the carbon nanotube interfaces on the gadolinium shuttles is achieved using photoacoustic experiments for measuring the thermal interface resistances above and below the gadolinium foil. Carbon nanotube growth studies on gadolinium demonstrated a reduction in thermal interface resistances from 28.8 ± 2.1 mm2K/W to as low as 17.9 ± 0.8 mm2K/W. Initial design, fabrication, and experimental techniques and results are presented in this paper.

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