Azobenzene polymers show promising photostrictive behavior for a broad range of applications in flow control, robotics, and energy harvesting applications. The conversion of solar energy directly into mechanical work provides unique capabilities in adaptive structures; however, the energy conversion of visible light into mechanical work presents several material chemistry challenges. Azobenzene strongly absorbs ultraviolet (UV) light and blue/green light which limits the efficiency of the photomechanical response under solar irradiation. Photon upconversion — combining two or more low energy photons (longer wavelength) to generate a higher energy excited state (shorter wavelength), provides an intriguing strategy to drive these high energy photochemical reactions with low energy light. We present an experimental study showing the feasibility to drive azobenzene photoisomerization using visible light via select up-conversion molecules in the fluidic state. Multi-physics modeling is then used to predict advances in photomechanical energy conversion when up-conversion molecules are introduced within an azobenzene polymer.
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ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 21–23, 2015
Colorado Springs, Colorado, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5729-8
PROCEEDINGS PAPER
Experimental Characterization and Modeling of Photon Upconversion in Azobenzene Photomechanical Polymers
Sadiyah Sabah Chowdhury,
Sadiyah Sabah Chowdhury
Florida A&M/Florida State University, Tallahassee, FL
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Catherine Kent,
Catherine Kent
Florida A&M/Florida State University, Tallahassee, FL
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Sean P. Hill,
Sean P. Hill
Florida State University, Tallahassee, FL
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Enric Baduell,
Enric Baduell
Florida State University, Tallahassee, FL
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Kenneth Hanson,
Kenneth Hanson
Florida State University, Tallahassee, FL
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William S. Oates
William S. Oates
Florida A&M/Florida State University, Tallahassee, FL
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Sadiyah Sabah Chowdhury
Florida A&M/Florida State University, Tallahassee, FL
Catherine Kent
Florida A&M/Florida State University, Tallahassee, FL
Sean P. Hill
Florida State University, Tallahassee, FL
Enric Baduell
Florida State University, Tallahassee, FL
Kenneth Hanson
Florida State University, Tallahassee, FL
William S. Oates
Florida A&M/Florida State University, Tallahassee, FL
Paper No:
SMASIS2015-8920, V001T01A009; 9 pages
Published Online:
January 11, 2016
Citation
Chowdhury, SS, Kent, C, Hill, SP, Baduell, E, Hanson, K, & Oates, WS. "Experimental Characterization and Modeling of Photon Upconversion in Azobenzene Photomechanical Polymers." Proceedings of the ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 1: Development and Characterization of Multifunctional Materials; Mechanics and Behavior of Active Materials; Modeling, Simulation and Control of Adaptive Systems. Colorado Springs, Colorado, USA. September 21–23, 2015. V001T01A009. ASME. https://doi.org/10.1115/SMASIS2015-8920
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