Accession Number : AD1035360

Title :   Belousov Zhabotinsky Autonomic Hydrogel Composites: Regulating Waves via Asymmetry (Postprint)

Descriptive Note : Journal Article

Corporate Author : AFRL Materials and Manufacturing Directorate Wright Patterson Air Force Base United States

Personal Author(s) : Buskohl,Philip R ; Vaia,Richard A

Full Text :

Report Date : 23 Sep 2016

Pagination or Media Count : 10

Abstract : Belousov-Zhabotinsky (BZ) autonomic hydrogel composites contain active nodes of immobilized catalyst (Ru) encased within a nonactive matrix. Designing functional hierarchies of chemical and mechanical communication between these nodes enables applications ranging from encryption, sensors, and mechanochemical actuators to artificial skin. However, robust design rules and verification of computational models are challenged by insufficient understanding of the relative importance of local (molecular) heterogeneities, active node shape, and embedment geometry on transient and steady-state behavior. We demonstrate the predominance of asymmetric embedment and node shape in low-strain, BZ-gelatin composites and correlate behavior with gradients in BZ reactants. Asymmetric embedment of square and rectangular nodes results in directional steady-state waves that initiate at the embedded edge and propagate toward the free edge. In contrast, symmetric embedment does not produce preferential wave propagation because of a lack of diffusion gradient across the catalyzed region.

Descriptors :   composite materials , hydrogels , wave propagation , steady state , materials processing , logic gates , films , bromine compounds , capillary tubes , diffusion , fabrication , CATALYSTS , chemical reactions , oscillators , computer simulations , asymmetry

Subject Categories : Laminates and Composite Materials
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE