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Mechanical deformation of aperiodic organic systems in response to electrostatic fields: molecular piezoelectricity

Werling, Keith (2019) Mechanical deformation of aperiodic organic systems in response to electrostatic fields: molecular piezoelectricity. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Piezoelectricity as a bulk phenomenon in crystals is well understood from scientific, mathematical and engineering perspectives and has found wide use in many devices that convert electrical to mechanical energy or vice versa. Many strong piezoelectric compounds are inorganic, stiff ceramics that possess large piezoelectric coefficients but may have non-ideal properties for some applications e.g. related to cost, toxicity, biocompatibility, and incidence
of fracture over time. Currently work is being done to create flexible and soft piezoelectric materials from organic compounds to make new, smart materials that could be used in medical, industrial, robotic and other technological applications. To this end the ability to
screen for good organic piezoelectrics is necessary and requires a fundamental understanding of piezoelectricity at the molecular and nanoscale level. At the heart of macroscopic piezoelectric properties are inter- and intramolecular interactions and the different deformation
response properties of these interactions in an applied electric field. This thesis investigates the linear response properties of molecules and small (aperiodic) systems the building blocks for macroscopic and nano-scale piezoelectric materials and develops methods and formalisms
with roots in strain theory to help better understand which types of inter- and intramolecular interactions are best suited to yield piezoelectric systems with specifically tailored responses to applied electric fields. At the same time, the methods and formalism presented here have
potential applications in the control of nanomachines via electric fields.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Werling, KeithKaw112@pitt.edu
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLambrecht, Daniellambrecht@pitt.edu
Committee MemberHutchison, Geoffreygeoffh@pitt.edu
Committee MemberJordan, Kenjordan@pitt.edu
Committee MemberYaron, Davidyaron@cmu.edu
Date: 25 September 2019
Date Type: Publication
Defense Date: 3 June 2019
Approval Date: 25 September 2019
Submission Date: 25 July 2019
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 149
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: piezoelectricity, nanomachines, strain theory, electromechanical response, hydrogen-bond, organic
Date Deposited: 25 Sep 2019 16:16
Last Modified: 25 Sep 2019 16:16
URI: http://d-scholarship.pitt.edu/id/eprint/37207

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