Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


Dissertation_VijayVenkatesh.pdf (48.83 MB)

ETD Abstract Container

Abstract Header

Mechanoelectrochemistry of electroactive polymers using shear-force based near-field microscopy

Venkatesh, Vijay
http://orcid.org/0000-0002-4578-2435
http://rave.ohiolink.edu/etdc/view?acc_num=osu158635396991601

Abstract Details

2020, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
Mechanoelectrochemistry is the study of volumetric strains produced due to electrochemical processes in faradaic materials and electrodes. A comprehensive understanding of mechanoelectrochemistry is essential for development of chemical actuators, sensors, and robust energy storage devices but has been elusive due to lack of experimental methodologies. This dissertation focuses on using a scanning electrochemical microscope (SECM) hardware equipped with shear-force (SF) for characterizing ion transport in polypyrrole doped with dodecylbenzenesulfonate (PPy(DBS)). SECM-SF is based on positioning a vibrating 'ultra-microelectrode’ (UME) proximal to a PPy(DBS) film to monitor mechanoelectrochemistry. The goal of this dissertation is to develop validated mechanoelectrochemistry models for PPy(DBS) based on structural properties of the UME. Towards this goal, a finite element model is formulated to understand influence of geometric parameters on SF response in Chapter 2. Dissimilarities in UME geometries arising from fabrication significantly affect SF measurements and hence motivates a rigorous assessment of SF dynamics of the UME. Reproducibility in SF response of the UME forms a basis for understanding SF-sensitive frequencies for imaging ion transport and topography across a (i) porous substrate (Chapter 3), and (ii) pore-spanning PPy(DBS) substrate in an arrangement referred to as an 'ionic redox transistor' (Chapter 4). The experimental methodologies developed in Chapters 3 and 4 are used to model static mechanoelectrochemistry using a mass-transport based mechanics model in Chapter 5 for understanding structure-property-function relationships in PPy(DBS). This dissertation finally concludes by demonstrating SF microscopy as an alternative to acoustic microscopy for imaging sub-surface defects in crystalline samples in Chapter 6.
Vishnu Baba Sundaresan (Committee Chair)
Noriko Katsube (Committee Co-Chair)
Jung-Hyun Kim (Committee Member)
202 p.
Engineering; Mechanical Engineering
scanning electrochemical microscopy; scanning ion conductance microscopy; shear-force

Recommended Citations

Citations

  • Venkatesh, V. (2020). Mechanoelectrochemistry of electroactive polymers using shear-force based near-field microscopy [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu158635396991601

    APA Style (7th edition)

  • Venkatesh, Vijay. Mechanoelectrochemistry of electroactive polymers using shear-force based near-field microscopy. 2020. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu158635396991601.

    MLA Style (8th edition)

  • Venkatesh, Vijay. "Mechanoelectrochemistry of electroactive polymers using shear-force based near-field microscopy." Doctoral dissertation, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu158635396991601

    Chicago Manual of Style (17th edition)

osu158635396991601
103
© 2020, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.