Magnetically directed soft actuators driven by moisture

2017 ◽  
Vol 5 (17) ◽  
pp. 4129-4133 ◽  
Author(s):  
Fengxian Gao ◽  
Ning Zhang ◽  
Xiaodong Fang ◽  
Mingming Ma
Keyword(s):  
Superparamagnetic Nanoparticles ◽  
Directional Motion ◽  
Polypyrrole Film ◽  
Soft Actuators

Herein we report the fabrication of a moisture-driven actuator capable of performing directional motion, by incorporating superparamagnetic nanoparticles into a water-responsive polypyrrole film.

Estimation of ion dimension doped in conducting polymers electrochemically

MRS Advances ◽  
2018 ◽  
Vol 3 (27) ◽  
pp. 1543-1549 ◽  
Author(s):  
Keiichi Kaneto ◽  
Fumito Hata ◽  
Sadahito Uto
Keyword(s):  
Conducting Polymers ◽  
Electrochemical Oxidation ◽  
Artificial Muscles ◽  
Counter Ions ◽  
Laser Displacement Meter ◽  
Polypyrrole Film ◽  
Soft Actuators ◽  
Ion Size ◽  
Isotropic Expansion ◽  
The Relationship

ABSTRACTElectroactive conducting polymers are suitable for soft actuators (artificial muscles). The actuation is induced by electrochemical oxidation of conducting polymer (film) in an electrolyte solution, due to insertion of bulky counter ions (dopant ions). The magnitude of deformation (strain) depends on the size of dopant ions and the degree of oxidation. It is worthwhile to know the relationship between the magnitudes of deformation and ion size. An electrodeposited Polypyrrole film was electrochemically cycled in aqueous electrolytes of NaCl, NaBr, NaNO3, NaBF4 and NaClO4. The strain of film during electrochemical oxidation and reduction was precisely measured using a laser displacement meter and a handmade apparatus. From the strain and electrical charges inserted in the film during oxidation, the volumes and radii of dopant ions were estimated, assuming the isotropic expansion of the film. The estimated anion radii of Cl-, Br-, NO3-, BF4- and ClO4- were 235, 246, 250, 270 and 290, respectively. The results were discussed taking the crystallographic and hydrated ion radii in literatures into consideration.

Directional motion categorization by pigeons

2003 ◽  
Author(s):  
Angie Koban ◽  
Robert Cook ◽  
Joel Fagot
Keyword(s):  
Directional Motion

Multifunctional Superparamagnetic Nanoparticles: From Synthesis to siRNA Delivery

2017 ◽  
Vol 23 (16) ◽  
Author(s):  
Sanam Arami ◽  
Majid Mahdavi ◽  
Mohammad Reza Rashidi ◽  
Marziyeh Fathi ◽  
Mohammad Saeid Hejazi ◽  
...  
Keyword(s):  
Sirna Delivery ◽  
Superparamagnetic Nanoparticles

Tribological characterization of all-polymer prosthesis based on multi-directional motion

2021 ◽  
pp. 089270572110286
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu ◽  
Cunao Feng
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Quantitative Relationship ◽  
Motion Path ◽  
Aspect Ratios ◽  
Directional Motion ◽  
Motion Paths ◽  
Prosthesis Material

The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios Rs-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios Rs-l of “∞”-shape, but less affected by loads.

Bistable dielectric elastomer actuator with directional motion

2021 ◽  
pp. 112889
Author(s):  
Junxing Meng ◽  
Yu Qiu ◽  
Chengyi Hou ◽  
Qinghong Zhang ◽  
Yaogang Li ◽  
...  
Keyword(s):  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuator ◽  
Directional Motion
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