A new type of Maxwell stress in soft materials due to quantum mechanical-elasticity coupling

Xiaobao Li, Liping Liu, Pradeep Sharma

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

All dielectrics deform when subjected to an electric field. This behavior is attributed to the so-called Maxwell stress and the origins of this phenomenon can be traced to geometric deformation nonlinearities. In particular, the deformation is large when the dielectric is elastically soft (e.g. elastomer) and negligible for most "hard" materials. In this work, we develop a theoretical framework which shows that a striking analog of the electrostatic Maxwell stress also exists in the context of quantum mechanical-elasticity coupling. The newly derived quantum-elastic Maxwell stress is found to be significant for soft nanoscale structures (such as the DNA) and underscores a fresh perspective on the mechanics and physics of polarons. We discuss potential applications of the concept for soft nano-actuators and sensors and the relevance for the interpretation of opto-electronic properties.

Original languageEnglish (US)
Pages (from-to)115-129
Number of pages15
JournalJournal of the Mechanics and Physics of Solids
Volume87
DOIs
StatePublished - Feb 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Nanoactuator
  • Quantum mechanical-elasticity coupling
  • Soft material

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