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Tallahassee, FL, United States

Van H.H.,High Performance Materials Institute | Zhang M.,High Performance Materials Institute
Materials Research Society Symposium Proceedings | Year: 2013

Novel field emission (FE) devices are introduced employing lateral architecture. Ultrathin multiwalled carbon nanotube (MWCNT) sheet were utilized to fabricate the emitter. Effects of basic configuration of sheets, including the orientation of CNTs and sheet thickness were examined. The novel device achieved the threshold field (the electric field at which current density reach 1 mA/cm2) of 0.67 V/μm and enhancement factor larger than 20,000. © 2013 Materials Research Society.

Chatterjee J.,High Performance Materials Institute | Liu T.,High Performance Materials Institute | Wang B.,High Performance Materials Institute | Zheng J.P.,Florida State University
Solid State Ionics | Year: 2010

A polymer gel electrolyte has been prepared based on polyvinyl alcohol, lithium salt and organic solvent N-methyl-2-pyrrolidone (NMP). This gel has the potential for use in secondary batteries and electrochemical capacitors. The conductivity of this gel electrolyte can be as high as 2 × 10- 3-5.8 × 10- 4 S/cm at room temperature. Functioning as separator and electrolyte, this gel system was used to evaluate the specific capacitance of an electrochemical capacitor with carbon nanotube films as the active electrodes.

Hammel E.C.,High Performance Materials Institute | Ighodaro O.L.-R.,High Performance Materials Institute | Okoli O.I.,High Performance Materials Institute
Ceramics International | Year: 2014

Ceramics with engineered porosity are promising materials for a number of functional and structural applications including thermal insulation, filters, bio-scaffolds for tissue engineering, and preforms for composite fabrication. In this application based review of advanced porous ceramics, the microstructure of porous components is discussed in terms of the necessary features required to achieve the ideal properties for the intended application. The processing methods that are capable of producing the required microstructure are addressed. Those methods which allow the pore structure to be tailored or controlled are considered the most favorable processing techniques. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Yan J.,High Performance Materials Institute | Uddin M.J.,High Performance Materials Institute | Dickens T.J.,High Performance Materials Institute | Dickens T.J.,NPGroup Inc. | Okoli O.I.,High Performance Materials Institute
Solar Energy | Year: 2013

Over the past two decades, dye-sensitized solar cell (DSSC) research continues to gain momentum since its low-cost and environmental sustainability provides a good foundation for practical applications. Recently, CNTs have been introduced into DSSCs to take advantage of their lower electrical resistance, flexibility, excellent electrocatalytic activity and mechanical integrity. This paper introduces the principle of carbon-based solar energy conversion and reviews different types of solar cells using incorporated CNTs as electrode materials. This article also reports on CNTs' outstanding electrocatalytic functions in enhancing wire-shaped solar cells' photo-energy conversion. © 2013 Elsevier Ltd.

Olawale D.O.,High Performance Materials Institute | Dickens T.,High Performance Materials Institute | Sullivan W.G.,High Performance Materials Institute | Okoli O.I.,High Performance Materials Institute | Wang B.,High Performance Materials Institute
Journal of Luminescence | Year: 2011

Extensive research work has been done in recent times to apply the triboluminescence (TL) phenomenon for damage detection in engineering structures. Of particular note are the various attempts to apply it in the detection of impact damages in composites and aerospace structures. This is because TL-based sensor systems have a great potential for wireless, in-situ and distributed (WID) structural health monitoring when fully developed. This review article highlights development and the current state-of-the-art in the application of TL-based sensor systems. The underlying mechanisms believed to be responsible for triboluminescence, particularly in zinc sulfide manganese, a highly triboluminescent material, are discussed. The challenges militating against the full exploitation and field application of TL sensor systems are also identified. Finally, viable solutions and approaches to address these challenges are enumerated. © 2011 Elsevier B.V. All rights reserved.

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