Spiropyran-functionalized photochromic nylon webbings for long-term ultraviolet light sensing
Abstract
Webbing structures are extensively employed in engineering systems as load-bearing components. In a field setting, webbings are frequently subject to extended ultraviolet (UV) light irradiation, which can affect their integrity and reduce their mechanical strength. Despite technological advancements in structural health monitoring, long-term UV sensing techniques for webbings remain under-developed. To fill this gap, we propose a photochromic nylon webbing that demonstrates color variation in response to extended UV exposure. The webbing offers a rich, yet controlled, color variation over multiple time scales that is conducive to UV sensing. A mathematical model grounded in photochemistry is developed to interpret experimental observations, unveiling the photochromic phenomenon as a multi-step, multi-timescale photochemical process involving several chemical species. The model captures the evolution of the coexisting species through a system of nonlinear, coupled ordinary differential equations, offering the basis for the inference of the webbing’s color. The proposed photochromic webbing and the photochemistry-based mathematical model could inform future designs of UV-sensitive structures that maintain sensitivity under weeks of continuous sunlight UV exposure.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 08, 2022
- Source ID
- 10.1063/5.0093641
Entities
People
- Maurizio Porfiri
- Osgar John Ohanian Iii
- Peng Zhang
Organizations
- Luna Innovations Incorporated
- New York University
- United States Navy