scholarly journals Ethanol Phase Change Actuator Based on Thermally Conductive Material for Fast Cycle Actuation

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4095
Author(s):  
Zirui Liu ◽  
Bo Sun ◽  
Jianjun Hu ◽  
Yunpeng Zhang ◽  
Zhaohua Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Phase Change ◽  
Thermal Imaging ◽  
Au Nanoparticles ◽  
Artificial Muscle ◽  
Fast Response ◽  
Artificial Muscles ◽  
Thermally Conductive ◽  
Mechanical Actuation

Artificial muscle actuator has been devoted to replicate the function of biological muscles, playing an important part of an emerging field at inter-section of bionic, mechanical, and material disciplines. Most of these artificial muscles possess their own unique functionality and irreplaceability, but also have some disadvantages and shortcomings. Among those, phase change type artificial muscles gain particular attentions, owing to the merits of easy processing, convenient controlling, non-toxic and fast-response. Herein, we prepared a silicon/ethanol/(graphene oxide/gold nanoparticles) composite elastic actuator for soft actuation. The functional properties are discussed in terms of microstructure, mechanical properties, thermal imaging and mechanical actuation characteristics, respectively. The added graphene oxide and Au nanoparticles can effectively accelerate the heating rate of material and improve its mechanical properties, thus increasing the vaporization rate of ethanol, which helps to accelerate the deformation rate and enhance the actuation capability. As part of the study, we also tested the performance of composite elastomers containing different concentrations of graphene oxide to identify GO-15 (15 mg of graphene oxide per 7.2 mL of material) flexible actuators as the best composition with a driving force up to 1.68 N.

scholarly journals Dielectric Elastomer Grippers

2021 ◽  
Vol 10 (5) ◽  
pp. 33-36
Author(s):  
Mills Patel ◽  
Rudrax Khamar ◽  
Akshat Shah ◽  
Tej shah ◽  
Bhavik Soneji
Keyword(s):  
Mechanical Properties ◽  
Power Generation ◽  
State Of The Art ◽  
Artificial Muscle ◽  
Dielectric Elastomer ◽  
Soft Robotics ◽  
Artificial Muscles ◽  
Dielectric Elastomer Actuators ◽  
Working Principle ◽  
Soft Actuators

This paper appraisals state-of-the-art dielectric elastomer actuators (DEAs) and their forthcoming standpoints as soft actuators which have freshly been considered as a crucial power generation module for soft robots. DEs behave as yielding capacitors, expanding in area and attenuation in thickness when a voltage is applied. The paper initiates with the explanation of working principle of dielectric elastomer grippers. Here the operation of DEAs include both physics and mechanical properties with its characteristics, we have describe methods for modelling and its introductory application. In inclusion, the artificial muscle based on DEA concept is also formally presented. This paper also elaborates DEAs popular application such as- Soft Robotics, Robotics grippers and artificial muscles.

Cellulose-Based Hydrogels with Controllable Electrical and Mechanical Properties

2018 ◽  
Vol 232 (9-11) ◽  
pp. 1707-1716 ◽  
Author(s):  
Enwei Zhang ◽  
Jing Yang ◽  
Wei Liu
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Artificial Muscle ◽  
Compressive Modulus ◽  
Electrically Conductive ◽  
Pure Cellulose ◽  
Reduced Graphene ◽  
Cellulose Hydrogel ◽  
Environmentally Friendly Method

Abstract Electrically conductive cellulose-based hydrogels are prepared by a facile and environmentally friendly method, of which the electrical and mechanical properties can be easily controlled by varying the graphene loading. With an ultralow initial addition of graphene oxide (GO, 0.2 wt% versus the mass of cellulose), the resulting cellulose/reduced graphene oxide (CG0.2) hydrogel shows a significantly enhanced compressive modulus of 332.01 kPa, 54.8% higher than that of pure cellulose hydrogel. Further increasing the addition of GO to 2 wt% (versus the mass of cellulose), the electrical conductivity of the resultant CG2.0 hydrogel is as high as 7.3×10−3 S/m, 10,000-fold higher than that of pure cellulose hydrogel, and of which the mechanical properties are also enhanced. These cellulose-based hydrogels with controllable electrical and mechanical properties have a great potential for application in drug delivery and artificial muscle.

Graphene oxide/polyurethane-based solid–solid phase change materials with enhanced mechanical properties

2017 ◽  
Vol 658 ◽  
pp. 38-46 ◽  
Author(s):  
Yan Zhou ◽  
Xiangdong Liu ◽  
Dekun Sheng ◽  
Changhong Lin ◽  
Fance Ji ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Phase Change ◽  
Phase Change Materials ◽  
Solid Phase

Mechanical Properties Analysis on Elongation Type of Pneumatic Artificial Muscles

2011 ◽  
Vol 110-116 ◽  
pp. 1313-1320
Author(s):  
De Xu Geng ◽  
Ji Zhao ◽  
Lei Zhang ◽  
Yun Wei Zhao
Keyword(s):  
Mechanical Properties ◽  
Artificial Muscle ◽  
Bending Stiffness ◽  
Air Pressure ◽  
Artificial Muscles ◽  
Rubber Tube ◽  
Accuracy Control ◽  
Axial Deformation ◽  
Bending Angle ◽  
Flexible Joint

This paper developed a novel elongation type of Pneumatic Artificial Muscle (PAM), which is mainly composed of the expandable internal rubber tube surrounded by the external cylindrical helical spring and the two ends are closed. The PAM is not only the actuator of the flexible joint but also the core components to make up of the flexible joint. Therefore, the mechanical properties of the PAM directly influence the performance of the flexible joint. A mathematical model on the axial deformation and bending stiffness of elongation type of PAM was built applying theoretical analysis and experimental research methods. The results show that the axial deformation of PAM and the air pressure supplying to the PAM are nonlinearly related due to the generic nonlinear of deformation of the rubber tube; the bending angle of the PAM is proportional to moment; Similarly, the bending angle of the PAM is also proportional to its length. Furthermore, it indicates that the air pressure indirectly affects the bending stiffness of PAM as the air pressure directly influences the elongation of PAM. Finally, this paper provides a powerful framework for the dynamic analysis and motion accuracy control of the flexible joint or the robot which is composed by the artificial muscles.

scholarly journals Bioinspired Polypyrrole based Fibrillary Artificial Muscle with Actuation and Intrinsic Sensing Capabilities

2021 ◽  
Author(s):  
Mihaela Beregoi ◽  
Samuel Beaumont ◽  
Alexandru Evanghelidis ◽  
Toribio F. Otero ◽  
Ionut Enculescu
Keyword(s):  
Electric Current ◽  
Electrochemical Polymerization ◽  
Muscle Fibers ◽  
Artificial Muscle ◽  
Artificial Muscles ◽  
Complex Activity ◽  
Sputtering Deposition ◽  
Mechanical Sensor ◽  
Mechanical Actuation ◽  
Current Potential

Abstract Artificial muscles comprise a bunch of materials, composites and devices performing a similar behavior to biological muscles, since a mechanical actuation is produced while consuming a certain amount of energy. However, in order to mimic the multiple simultaneous functionalities of the natural muscles, i.e. the proprioception, new devices should be designed. A non-conventional, bioinspired device based on polypyrrole coated electrospun fibrous microstructures, which works simultaneously as artificial muscle and mechanical sensor is reported. A simple fabrication algorithm based on electrospinning, sputtering deposition and electrochemical polymerization produced electroactive aligned ribbon meshes with analogous characteristics as natural muscle fibers. These can simultaneously produce a movement (by applying an electric current/potential) and sense the effort of holding weights (by measuring the potential/current while holding objects up to 24 mg). The amplitude of the movement decreases by increasing the load, a behavior similar with natural muscles. Moreover, when different weights were hanged on the device, it senses the load modification, demonstrating a sensitivity of about 6 mV/mg for oxidation and 3 mV/mg for reduction. These results are important since simultaneous actuation and sensitivity are essential for complex activity. Such devices with multiple functionalities can open new possibilities of applications as smart prosthesis or lifelike robots.

High-quality graphene aerogels for thermally conductive phase change composites with excellent shape stability

2018 ◽  
Vol 6 (14) ◽  
pp. 5880-5886 ◽  
Author(s):  
Jing Yang ◽  
Xiaofeng Li ◽  
Shuang Han ◽  
Runzhou Yang ◽  
Peng Min ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phase Change ◽  
Excellent Performance ◽  
Shape Stability ◽  
High Quality ◽  
Conductive Phase ◽  
Graphene Aerogels ◽  
Thermally Conductive ◽  
Phase Change Composites

High-quality graphene aerogels are prepared from highly processable graphene oxide pastes, showing excellent performance in thermally conductive phase change composites.

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