Dr. Choonghee Jo Profile

Dr. Choonghee Jo

at Univ of Toronto

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Proceedings Article | 31 March 2010 Paper

Fabrication and characterization of ionic polymer gel actuators

Choonghee Jo, Eunji In, Hani Naguib

Proceedings Volume 7644, 764419 (2010) https://doi.org/10.1117/12.851787

KEYWORDS: Polymers, Polymerization, Ions, Molecules, Actuators, Amplifiers, Polymeric actuators, Sodium, Electrodes, Chemical reactions

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Poly-AMPS (PAMPS) gel was fabricated and its electroactive behavior was studied. A weakly cross-linked anionic PAMPS gel was produced by radical polymerization using 2-acrylamido-2-methylpropane sulfonic acid (AMPS) monomers, where N,N'-methlenebisacrylamide (MBAA) and α -ketoglutaric acid were used as a cross-linking agent and a radical initiator, respectively. The polymerization was carried out at 55°C for at least 24 hours. Density and the degree of swelling of gel samples were investigated as physical properties. Also, swelling experiments were conducted in a surfactant solution using 1-dodecylpyridinium chloride hydrate. The chemo-mechanical properties of PAMPS gel were studied in a dilute surfactant solution under the electric field. The effect of material parameters on the bending deformation was investigated. As design parameters, sample thickness, current density, ion concentration of the surfactant solution, and cross-linking degree of gel were chosen, and the effect of these parameters on the actuation was studied.

Proceedings Article | 6 April 2009 Paper

Modeling and optimization of ionic polymer gel actuators

Choonghee Jo, Hani Naguib, Roy Kwon

Proceedings Volume 7287, 72870Z (2009) https://doi.org/10.1117/12.815866

KEYWORDS: Ions, Polymers, Optimization (mathematics), Molecules, Data modeling, Polymeric actuators, Actuators, Electrodes, Adsorption, Cesium

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The electro-active behavior of ionic polymer gel was modeled and the optimum condition of decision parameters that maximize the deflection of gel was investigated. An actuation model characterizing the bending deformation of polymer gel under electric field was proposed considering the chemo-electro-mechanical parameters. In the modeling, swelling or shrinking phenomenon due to the difference of concentration at the boundary between the gel and solution was considered first before the electric field is applied. Then, bending deformation under the concentration difference of ions was calculated. Differential osmotic pressure at the boundary of gel and solution determine the degree of swelling or shrinking of gel. From this actuation behavior, strain or deformation of gel is calculated. To find the optimum conditions for the deformation of gel, a non-linear constrained optimization model was proposed, where the equation for bending deflection of gel is used as the objective function and the relationship among the decision variables and the range of the variables are used as constraints. In the optimization model, electric voltage, thickness of gel, concentration of polyion in the gel, ion concentration in the solution and degree of cross-linking in gel were considered as decision variables. The predictions by the proposed model were compared with experimental data.

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