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593 results on '"Wardle, Brian L."'

252. A high performance hybrid asymmetric supercapacitor via nano-scale morphology control of graphene, conducting polymer, and carbon nanotube electrodes

Author

Zhou, Yue, primary, Lachman, Noa, additional, Ghaffari, Mehdi, additional, Xu, Haiping, additional, Bhattacharya, Dhiman, additional, Fattahi, Pouria, additional, Abidian, Mohammad Reza, additional, Wu, Shan, additional, Gleason, Karen K., additional, Wardle, Brian L., additional, and Zhang, Q. M., additional

Published
2014
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294. Nanoengineered thrusters for the next giant leap in space exploration.

Author

Lozano, Paulo C., Wardle, Brian L., Moloney, Padraig, and Rawal, Suraj

Subjects
NANOSTRUCTURED materials, SPACE exploration, FLUID dynamic measurements
Abstract

The physics underlying operation of cold (room-temperature) ionic-liquid emitter sources for use in propulsion shows that such thrusters are advantaged relative to all other “rockets” because of the direct scaling of power with emitter array density. Nanomaterials and their integration through nano- and microfabrication can propel these charged-particle sources to the forefront and open up new applications including mass-efficient in-orbit satellite propulsion and high-thrust-density deep-space exploration. Analyses of electrostatic, fluid-dynamic, and electrochemical limits all suggest that arrays of such ionic-liquid thrusters can reach thrust densities beyond most in-space propulsion concepts, with a limit on nanoporous thruster packing density of ∼1 μm due to ionic-liquid viscous flow and electrochemistry. Nanoengineered materials and manufacturing schemes are suggested for the implementation of microfabricated and nanostructured thruster arrays. [ABSTRACT FROM PUBLISHER]

Published
2015
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300. Strength and Performance Enhancement of Bonded Joints by Spatial Tailoring of Adhesive Compliance via 3D Printing

Author

Kumar, S., Wardle, Brian L., and Arif, Muhamad F.

Abstract

Adhesive bonding continues to emerge as a preferred route for joining materials with broad applications including advanced structures, microelectronics, biomedical systems, and consumer goods. Here, we study the mechanics of deformation and failure of tensile-loaded single-lap joints with a compliance-tailored adhesive. Tailoring of the adhesive compliance redistributes stresses and strains to reduce both shear and peel concentrations at the ends of the adhesive that determine failure of the joint. Utilizing 3D printing, the modulus of the adhesive is spatially varied along the bondlength. Experimental strength testing, including optical strain mapping, reveals that the strain redistribution results in a greater than 100% increase in strength and toughness concomitant with a 50% increase in strain-to-break while maintaining joint stiffness. The tailoring demonstrated here is immediately realizable in a broad array of 3D printing applications, and the level of performance enhancement suggests that compliance tailoring of the adhesive is a generalizable route for achieving superior performance of joints in other applications, such as advanced structural composites.

Published
2017
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