||Wright-Patterson AFB, OH 454337817
|White, Timothy John
We are looking for qualified Associates to join our team at AFRL in the Materials and Manufacturing Directorate. Working at AFRL is a unique opportunity to solve important, long-term challenges that guide research efforts in an environment that strongly encourages collaboration (government/academic/industry), publication, and conference attendance. This position is available for applicants from a broad range of backgrounds.
Specifically, this effort relates to liquid crystals. Liquid crystalline materials are pervasive in modern society as the basis of the display industry. It has been long-known that liquid crystalline materials in polymeric forms also exhibit exceptional characteristics in high performance applications as transparent armor or bulletproof vests as well as in optics and photonics. A specific class of liquid crystalline polymeric materials referred to as liquid crystalline elastomers were predicted by de Gennes to have exceptional promise as artificial muscles, owing to the unique assimilation of anisotropy and elasticity. Subsequent experimental studies have confirmed the salient features of these materials, with respect to other forms of stimuli-responsive soft matter, are actuation cycles of up to 400% as well “soft elasticity” (stretch at minimal stress). Our recent efforts have focused on developing materials chemistry amenable to allowing arbitrary local control of the anisotropy within these materials. Enabled by this chemistry, we have prepared complex actuators and mechanical elements from liquid crystal elastomers. Notably, these materials are subject to mechanical design but homogenous in composition (lacking material/material interfaces).
The effort would fall into AFRL's Responsive Photonic Materials (RPM) group, which currently focuses on two thrusts: (1) development of dynamic optical materials based on liquid crystals or other electro-optic media such as “e-ink” (any variant) and (2) exploration of stimuli-induced responses in liquid crystalline polymer networks and elastomers.
White TJ, Broer DJ: Nature Materials 14: 1087-1098, 2015
Ware TH, et al: Science 347(6225): 982-984, 2015
Ware TH, et al: Nature Communications 7: 10781, 2016
Mechanics; Optics; Polymers; Liquid crystals; Electro-optics; Photopolymerization; Photochemistry;