We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Microscopic mechanisms of deformation transfer in high dynamic range branched nanoparticle deformation sensors.
- Authors
Raja, Shilpa N.; Xingchen Ye; Jones, Matthew R.; Liwei Lin; Govindjee, Sanjay; Ritchie, Robert O.
- Abstract
Nanoscale stress sensing is of crucial importance to biomechanics and other fields. An ideal stress sensor would have a large dynamic range to function in a variety of materials spanning orders of magnitude of local stresses. Here we show that tetrapod quantum dots (tQDs) exhibit excellent sensing versatility with stress-correlated signatures in a multitude of polymers. We further show that tQDs exhibit pressure coefficients, which increase with decreasing polymer stiffness, and vary >3 orders of magnitude. This high dynamic range allows tQDs to sense in matrices spanning >4 orders of magnitude in Young's modulus, ranging from compliant biological levels (~100 kPa) to stiffer structural polymers (~5 GPa). We use ligand exchange to tune filler-matrix interfaces, revealing that inverse sensor response scaling is maintained upon significant changes to polymer-tQD interface chemistry. We quantify and explore mechanisms of polymer-tQD strain transfer. An analytical model based on Mori-Tanaka theory presents agreement with observed trends.
- Subjects
YOUNG'S modulus; SURFACE chemistry; DETECTORS; QUANTUM dots; MAGNITUDE (Mathematics); BIOMECHANICS
- Publication
Nature Communications, 2018, Vol 9, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-018-03396-5