Investigating a few key issues of ionomeric polymer conductive network composite electromechanical transducers

2009 ◽  
Author(s):  
Sheng Liu ◽  
Minren Lin ◽  
Yang Liu ◽  
Qiming Zhang ◽  
Reza Montazami ◽  
...  
Keyword(s):  
Conductive Network ◽  
Key Issues ◽  
Electromechanical Transducers ◽  
Conductive Network Composite

scholarly journals Conductive filler morphology effect on performance of ionic polymer conductive network composite actuators

2010 ◽  
Author(s):  
Sheng Liu ◽  
Yang Liu ◽  
Hulya Cebeci ◽  
Roberto Guzman de Villoria ◽  
Jun-Hong Lin ◽  
...  
Keyword(s):  
Conductive Filler ◽  
Conductive Network ◽  
Ionic Polymer ◽  
Morphology Effect ◽  
Conductive Network Composite

The Effect of Ionic Liquid Uptake and Self-assembled Conductive Network Composite Layers on NafionTM based Ionic Polymer Metal Composite Electromechanical Bending Actuators

2013 ◽  
Vol 1575 ◽  
Author(s):  
Dong Wang ◽  
Reza Montazami ◽  
James R. Heflin
Keyword(s):  
Ionic Liquid ◽  
Porous Electrode ◽  
Metal Composite ◽  
Ionic Polymer Metal Composite ◽  
Conductive Network ◽  
Bending Performance ◽  
Ionic Polymer ◽  
Polymer Metal ◽  
Self Assembled ◽  
Conductive Network Composite

ABSTRACTIonic liquid (IL) is used as the working electrolyte in ionic polymer metal composite (IPMC) electromechanical bending actuators because of its high stability and conductivity, which are crucial for the consistency and speed of the actuation. Because the bending actuation is caused by the migration and accumulation of the cations and anions of the IL, it is clear that both the overall number of ions and the effectiveness of ion transport and accumulation play important roles in the actuation behavior. In this paper, the effect of enhancing the ion accumulation by the self-assembled conductive network composite (CNC) layers is investigated by comparing the bending behavior of actuators with and without CNC layers. In addition, IPMC actuators with various IL uptakes are also tested in order to study the dependence of the bending performance on the amount of the ions available. It is found that, with the CNC layers, the maximum bending curvature of the actuator increases with increased IL, which shows the crucial role played by the IL. However, under the same conditions, the performance improvement of actuators without CNC layers saturates when the IL uptake reaches around 10% wt. This demonstrates the role of the CNC layers to provide a porous electrode with increased capacitance that thus accommodates accumulation of more ions near the electrodes, which in turn boosts the overall bending curvature of the actuator.

Probing vacancies and structural distortions at individual defects in ceramics using EELS

1996 ◽  
Vol 54 ◽  
pp. 678-679
Author(s):  
D. J. Wallis ◽  
N. D. Browning
Keyword(s):  
Structural Information ◽  
Core Loss ◽  
Nearest Neighbors ◽  
Ceramic Materials ◽  
Scanning Transmission Electron Microscope ◽  
Real Space ◽  
Atomic Scale ◽  
Structure Property ◽  
Scanning Transmission ◽  
Key Issues

In electron energy loss spectroscopy (EELS), the near-edge region of a core-loss edge contains information on high-order atomic correlations. These correlations give details of the 3-D atomic structure which can be elucidated using multiple-scattering (MS) theory. MS calculations use real space clusters making them ideal for use in low-symmetry systems such as defects and interfaces. When coupled with the atomic spatial resolution capabilities of the scanning transmission electron microscope (STEM), there therefore exists the ability to obtain 3-D structural information from individual atomic scale structures. For ceramic materials where the structure-property relationships are dominated by defects and interfaces, this methodology can provide unique information on key issues such as like-ion repulsion and the presence of vacancies, impurities and structural distortion.An example of the use of MS-theory is shown in fig 1, where an experimental oxygen K-edge from SrTiO3 is compared to full MS-calculations for successive shells (a shell consists of neighboring atoms, so that 1 shell includes only nearest neighbors, 2 shells includes first and second-nearest neighbors, and so on).

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