Subject: SEMINAR NOTICE - S. Leach, Mon. 4/30/12
From: "Stacey, Lisa A" <[email-masked]>
To: "[email-masked]'" <[email-masked]>
Date: Wed, 25 Apr 2012 16:06:29 -0400

Subject: FW: SEMINAR NOTICE-S. Leach, Mon. 4/30/12, 10:00 AM, Rm. 1028
From: "Stacey, Lisa A" <[email-masked]>
To: "[email-masked]'" <[email-masked]>
Date: Wed, 25 Apr 2012 16:00:50 -0400

Lisa Stacey
Secretary/Development Assistant
Purdue University
School of Materials Engineering
765/494-4100

From: Stacey, Lisa A [mailto:[email-masked]]
Sent: Wednesday, April 25, 2012 4:00 PM
To: [email-masked]'; [email-masked]'; [email-masked]'
Subject: SEMINAR NOTICE-S. Leach, Mon. 4/30/12, 10:00 AM, Rm. 1028

MATERIALS SCIENCE AND ENGINEERING
SEMINAR

Mechanics of Materials of Eletrochemical Actuators

by

Sarah Leach
Purdue Ph.D. Prelim 1 Exam
Advisor:  Prof. E. Garcia

ABSTRACT

Electrochemical actuators are electronic-current controlled devices which undergo large volumetric changes that can potentially deliver mechanical energy densities greater than those provided by piezoelectric, shape memory alloy, magnetostrictive, or pneumatic technologies.  Currently, a number of materials have been demonstrated as feasible technologies, but require immersion in an electrolyte solution, which severely limits the possible applications.  Carbon nanofibers and polyaniline fibers have also been combined with solid polymer electrolytes to provide mechanical integrity, but the response times are slower than those delivered in liquid electrolyte systems, they require larger activation voltages, and the polymer electrolyte layers limit mechanical strength.  This presentation explores materials and device architectures to improve mechanical strength and reliability.  The main challenge and opportunity for solid state actuators is the optimization of the strain and cycle time through selection of geometry, elastic modulus, and lithium diffusivity of the materials.  The volumetric change and rate of change lead to mechanical stresses which are a function of material com- position and thickness, and of the number and placement of the layers.  The material science-related advantages and disadvantages of this technology are reviewed and an experimental framework is proposed based on a simple analytical model.

Date:   Monday, April 30, 2012

Time:        10:00 A.M.
Place:   ARMS 1028

PURDUE MSE

Lisa Stacey
Secretary/Development Assistant
Purdue University
School of Materials Engineering
765/494-4100