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Interaction of ions and polymer membranes in IPMC

Interaction of ions and polymer membranes in IPMC. Nichelle’Le Carrington. Graduate mentor: Emma Hong Advisor: Dr. Reza Montazami,. Outline. Introduction to IPMCs Motivation and objectives Approach, methods Current status of work/current results Work in progress, planned work and timeline.

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Interaction of ions and polymer membranes in IPMC

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  1. Interaction of ions and polymer membranes in IPMC Nichelle’Le Carrington Graduate mentor: Emma Hong Advisor: Dr. Reza Montazami,

  2. Outline • Introduction to IPMCs • Motivation and objectives • Approach, methods • Current status of work/current results • Work in progress, planned work and timeline

  3. Polymeric systems Metal Electrode Ionic Polymer Membrane • Symmetric structure • Ionic polymer membrane: Structural backbone of the device, ion permeable • Conductive Network Composite: Host to excess ions, ionic and electric conductive matrix, most influential on mechanical properties • Electrolyte:Provides ions • Outer electrodes: Deliver electric charge Conducting Network Composite Thin-film CNC CNC IPMC Not to scale

  4. Mobility of Ions In presence of an electric field, cations and anions move toward cathode and anode respectively. The motion is due to attraction and repulsion forces from electrodes with similar and opposite charge. The mobility of ions can be reversed by changing the polarity of the electric field. Based on type and thickness of membrane and type and size of ions , ions may or may not pass through the membrane.

  5. Motivation and Objectives • Motivation • Ionic interactions and transport through polymeric networks is the key phenomenon in functionality of fuel cells, metal-ion polymer batteries, ionic sensors and ionic actuators. Understanding the fundamentals of these phenomena would allow us to design ionic devices with higher efficiency and better performance. • Objectives: • Identify motion of ions in polymeric systems. • Measure and characterize the mobility of ions in polymeric systems. • Investigate ionic interactions in polymeric systems.

  6. Methods and Approach • IPMCs were fabricated using Layer-by-Layer Self-Assembly then made into devices by adding copper electrodes .

  7. Methods and Approach Ionic Liquids Aqueous Salt Solutions Lithium Chloride (LiCl- Crystalline Solid) 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate (EMI-Tf) Source: http://www.3dchem.com/inorganicmolecule.asp?id=371#

  8. Methods and Approach Equipment Testing Apperatus Hardware: VersaSTAT 4 Software: VersaStudio

  9. Current Results EMI-Tf ionic liquid in Nafion membrane Identifying the current due to ions Sample 1: Trial 1 (07/02/12)

  10. Current Results EMI-Tf ionic liquid in Nafion membrane LiCl aqueous solution in Nafion membrane Step Properties: Potential(V):4&(-4) Scan properties: Time Per Pts-0.02 Duration-20sec.

  11. Current Status • Fabricated IPMCs using the ionic liquid EMI-Tf. • Fabricated IPMCs using the aqueous salt solution of LiCl. • Identified mobility of ions through IPMC, using the VersaSTAT 4 and the VersaStudio Program. • Written 1st draft of Introduction and materials and methods sections, and literary review of the paper.

  12. Work In Progress and Timeline • Fabricate other IPMCs using the EmI-Tf ionic liquid .(Week 7) • Comparing the charts of the IPMCs fabricated using ionic liquids with those fabricated using aqueous salts. (Week 8) • Write second drafts of paper components.

  13. Discussion Questions / comments

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