Electroactive Polymer Actuator Based on PVDF and Graphene through Electrospinning

2015 ◽  
Vol 1105 ◽  
pp. 311-314 ◽  
Author(s):  
Fan Wang ◽  
Seong Young Ko ◽  
Jong Oh Park ◽  
Suk Ho Park ◽  
Chang Doo Kee
Keyword(s):  
Ionic Conductivity ◽  
Composite Membrane ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Electroactive Polymer ◽  
High Porosity ◽  
Bending Deformation ◽  
Graphene Membrane ◽  
Polymer Actuator

We report a novel high-performance electroactive polymer actuator based on poly (vinylidene fluoride) (i.e., PVDF) and graphene. The PVDF-graphene composite membranes were fabricated through electrospinning method. The electrospun composite membrane has a three-dimensional network structure, high porosity, and large ionic liquid solution uptake which are a prerequisite for high performance dry-type electroactive soft actuators. The conductive poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) (PEDOT:PSS) layers were deposited on the surfaces of the composite membrane through dipping-drying method. The electroactive PVDF-graphene actuators under both harmonic and step electrical inputs show larger bending deformation and faster response time than the pure PVDF actuator. X-ray diffusion (XRD) and ionic conductivity testing results for the PVDF-graphene membrane were compared with those of pristine PVDF. Most important, the PVDF-graphene actuator shows much larger bending deformation under low input voltage, and this could be due to the synergistic effects of the higher ionic conductivity of PVDF-graphene membrane and the electrochemical doping processes of the PEDOT:PSS electrode layers.

Electroactive Polymer Deformable Micromirrors (EAPDM) for Biomedical Optics

2004 ◽  
Vol 820 ◽  
Author(s):  
Cheng Huang ◽  
Bo Bai ◽  
Baojun Chu ◽  
Jim Ding ◽  
Q.M. Zhang
Keyword(s):  
Electric Fields ◽  
High Performance ◽  
Electromechanical Coupling ◽  
Microelectromechanical Systems ◽  
Vinylidene Fluoride ◽  
Low Cost ◽  
Biomedical Optics ◽  
Electroactive Polymer ◽  
Polymer Actuator ◽  
Potential Applications

AbstractElectroactive polymers (EAPs) are capable of converting energy in the form of electric charge and voltage to mechanical force and movement and vice versa. Several electroactive polymer actuator materials whose responses are controlled by external electric fields, e.g. poly(vinylidene fluoride-trifluoroethylene) based fluoroterpolymers, have generated considerable interest for use in applications such as artificial muscles, sensors, parasitic energy capture, integrated bio-microelectromechanical systems (BioMEMS) and microfluidic devices due to their high electric-field induced strain, high elastic modulus, high electromechanical coupling and high frequency operation, etc. Scaling the EAP down into microsystems is one of the promising trends of EAP actuators and sensors especially for biomedical engineering. The combination of micro-optics and integrated BioMEMS, referred to as bio-micro-opto-electromechanical systems (BioMOEMS), makes a new opportunity for innovation in the EAP field. We present an approach to the fabrication of low-cost, large-stroke deformable micromirrors based on high performance electroactive polymer film microactuator arrays. Integrated Optic-BioMEMS based on electroactive polymer deformable micromirror (EAPDM) technology provide potential applications in biomedical optics such as ophthalmology (retinal imaging and vision care) and cancer detection and treatment.

High Performance Electrospun PVdF-HFP/MMT Nanofibrous Composite Membrane Electrolyte for Li-Ion Capacitors

2017 ◽  
Vol 14 ◽  
pp. 1-15
Author(s):  
Arun Kumar Solarajan ◽  
Vignesh Murugadoss ◽  
Subramania Angaiah
Keyword(s):  
Composite Membrane ◽  
High Performance ◽  
Electrode Materials ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Strength Analysis ◽  
Electrospinning Technique ◽  
Electrolyte Uptake ◽  
Poly Vinylidene Fluoride ◽  
Li Ion

The electrospun poly(vinylidene fluoride-co-hexafluoropropylene)/montmorillonite nanofibrous composite membranes (esCPMs) were prepared by electrospinning technique using a mixture of different amounts of montmorillonite (0, 3, 5, 7 and 10 wt%) into 16 wt% of PVDF-HFP polymer solution in 7:3 wt% of acetone and dimethylacetamide as the solvent. The effect of montmorillonite (MMT) on electrospun PVdF-HFP membrane has been studied by XRD, DSC, TGA and tensile strength analysis. It is found that electrospun PVDF-HFP/MMT nanofibrous composite membrane obtained using 5wt% MMT has a higher porosity, electrolyte uptake, ionic conductivity, electrochemical stability window and showed higher specific capacitance and good compatibility with electrode materials.

Mesoporous titania-embedded polyacrylonitrile composite nanofibrous membrane for particulate matter filtration

2019 ◽  
pp. 089270571985992
Author(s):  
P Reena ◽  
N Gobi ◽  
P Chitralekha ◽  
D Thenmuhil ◽  
V Kamaraj
Keyword(s):  
Particulate Matter ◽  
Composite Membrane ◽  
Weight Ratio ◽  
Composite Membranes ◽  
Areal Density ◽  
Mesoporous Titania ◽  
High Porosity ◽  
Homogenous Distribution

In the present work, mesoporous titania (MT)-embedded polyacrylonitrile (PAN) nanofibrous membranes have been developed and studied for their efficiency in particulate matter (PM) filtration. Using Box–Behnken method, 15 nanofibrous composite membranes were obtained through electrospinning by choosing three different process variables, such as MT (weight ratio), areal density (g m−2), and spinning time (h). The characterization of resulted nanofibrous composite membranes revealed that the homogenous distribution of MT (2.9 nm) within the PAN delivers high porosity as well as air permeability. Further, filtration efficiency (FE) was also analyzed for PM from 0.3 µm to 3 µm. PM filtration studies suggested that the nanofibrous composite membrane developed from 15% MT, spin time of 2 h, and areal density of 80 g m−2 possesses overall efficiency of 96.4%, without pressure drop for the composite. The results suggest that the role of MT was found to be significant in achieving successful filtration of PM. In addition to successful FE, the desirability value of the developed composite was also calculated statistically and the optimized composite membrane was identified.

PEI-SiO2 composite membranes with high thermal stability: Synthesis by self-assembled in situ growth and application in lithium-ion batteries

2020 ◽  
pp. 095400832096455
Author(s):  
Wei Song ◽  
Weiwei Cui ◽  
Xu Wang ◽  
Zeyu Lin ◽  
Wei Deng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Batteries ◽  
Composite Membrane ◽  
Retention Rate ◽  
Lithium Ion ◽  
Composite Membranes ◽  
High Porosity ◽  
Electrolyte Uptake ◽  
Electrochemical Window

To improve the safety of lithium-ion batteries (LIBs), a polyether amide–silica (PEI-SiO2) composite membrane was developed by the in situ hydrolysis of tetraethylorthosilicate (TEOS) and its subsequent self-assembly on the surface of PEI fibers. Because of the presence of the SiO2 shell, the PEI-SiO2 composite membrane exhibited good thermal stability at high temperatures. The composite membrane did not change its color and size after heating at 200°C for 1 h as well as exhibited excellent flame retardancy. Moreover, the membrane maintained its high porosity even after the introduction of shell layers. The electrolyte is completely absorbed in the membrane within 0.5 s. The electrolyte uptake was up to 625%, and the ionic conductivity was up to 1.9 mS/cm at room temperature. Compared to the polyolefin membrane and the pure PEI membrane, the PEI-SiO2 composite membrane showed higher electrochemical stability, with an electrochemical window of up to 5.5 V. The battery assembled with the composite membrane showed excellent cycle stability, and the capacity retention rate was as high as 98.6% after 50 cycles. The LIBs based on the PEI-SiO2 composite membrane exhibited safe operation and high electrochemical performance, thus highlighting the applicability of the composite membrane in high-power batteries.

scholarly journals A New Class of P(VdF-HFP)-CeO2-LiClO4-Based Composite Microporous Membrane Electrolytes for Li-Ion Batteries

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
G. Vijayakumar ◽  
S. N. Karthick ◽  
A. Subramania
Keyword(s):  
Composite Membrane ◽  
Phase Inversion ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Cycling Performance ◽  
Microporous Membrane ◽  
Inversion Method ◽  
Electrolyte Uptake ◽  
A Cell ◽  
Polymer Dissolution

Composite microporous membranes based on Poly (vinylidene fluoride–co-hexafluoro propylene) P(VdF-co-HFP)-CeO2were prepared by phase inversion and preferential polymer dissolution process. It was then immersed in 1M LiClO4-EC/DMC (v/v=1:1) electrolyte solution to obtain their corresponding composite microporous membrane electrolytes. For comparison, composite membrane electrolytes were also prepared by conventional phase inversion method. The surface morphology of composite membranes obtained by both methods was examined by FE-SEM analysis, and their thermal behaviour was investigated by DSC analysis. It was observed that the preferential polymer dissolution composite membrane electrolytes (PDCMEs) had better properties, such as higher porosity, electrolyte uptake (216 wt%), ionic conductivity (3.84 mS⋅cm−1) and good electrochemical stability (4.9 V), than the phase inversion composite membrane electrolytes (PICMEs). As a result, a cell fabricated with PDCME in between mesocarbon microbead (MCMB) anode and LiCoO2cathode had better cycling performance than a cell fabricated with PICME.

High-performance bioelectrocatalysts created by immobilization of an enzyme into carbon-coated composite membranes with nano-tailored structures

2017 ◽  
Vol 5 (38) ◽  
pp. 20244-20251 ◽  
Author(s):  
Tetsuji Itoh ◽  
Yuuta Shibuya ◽  
Akira Yamaguchi ◽  
Yasuto Hoshikawa ◽  
Osamu Tanaike ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Mesoporous Silica ◽  
Composite Membrane ◽  
High Performance ◽  
Direct Electron Transfer ◽  
Composite Membranes ◽  
Silica Nanotubes ◽  
Carbon Coated

We have achieved direct electron transfer between enzymes and electrodes through establishment of a regular enzyme array by encapsulation it in a carbon-coated composite membrane with mesoporous silica nanotubes (C/F127MST).

scholarly journals A PI Controller with a Robust Adaptive Law for a Dielectric Electroactive Polymer Actuator

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1326
Author(s):  
Jakub Bernat ◽  
Jakub Kolota
Keyword(s):  
Adaptive Control ◽  
High Performance ◽  
Pi Controller ◽  
Robust Adaptive Control ◽  
Electroactive Polymer ◽  
Pole Placement ◽  
Placement Problem ◽  
Controller Gain ◽  
Polymer Actuator ◽  
Robust Adaptive

Dielectric electroactive polymer actuators are new important transducers in control system applications. The design of a high performance controller is a challenging task for these devices. In this work, a PI controller was studied for a dielectric electroactive polymer actuator. The pole placement problem for a closed-loop system with the PI controller was analyzed. The limitations of a PI controller in the pole placement problem are discussed. In this work, the analytic PI controller gain rules were obtained, and therefore extension to adaptive control is possible. To minimize the influence of unmodeled dynamics, the robust adaptive control law is applied. Furthermore, analysis of robust adaptive control was performed in a number of simulations and experiments.

scholarly journals Supported MXene/GO Composite Membranes with Suppressed Swelling for Metal Ion Sieving

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 621
Author(s):  
Zongjie Yin ◽  
Zong Lu ◽  
Yanyan Xu ◽  
Yonghong Zhang ◽  
Liliang He ◽  
...  
Keyword(s):  
Composite Membrane ◽  
Water Purification ◽  
Metal Ion ◽  
High Performance ◽  
Composite Membranes ◽  
Transition Metal Carbide ◽  
Cross Linking ◽  
Metal Carbide ◽  
Ion Exclusion ◽  
The Cross

Novel two-dimensional (2D) membranes have been utilized in water purification or seawater desalination due to their highly designable structure. However, they usually suffer from swelling problems when immersed in solution, which limits their further applications. In this study, 2D cross-linked MXene/GO composite membranes supported on porous polyamide substrates are proposed to improve the antiswelling property and enhance the ion-sieving performance. Transition-metal carbide (MXene) nanosheets were intercalated into GO nanosheets, where the carboxyl groups of GO combined the neighboring hydroxyl terminal groups of MXene with the formation of -COO- bonds between GO and MXene nanosheets via the cross-linking reaction (−OH + −COOH = −COO− + H2O) after heat treatment. The permeation rates of the metal ions (Li+, Na+, K+, Al3+) through the cross-linked MXene/GO composite membrane were 7–40 times lower than those through the pristine MXene/GO membrane. In addition, the cross-linked MXene/GO composite membrane showed excellent Na+ rejection performance (99.3%), which was significantly higher than that through pristine MXene/GO composite membranes (80.8%), showing improved ion exclusion performance. Such a strategy represents a new avenue to develop 2D material-derived high-performance membranes for water purification.

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