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60. Development of an Anisotropic Thermal Transport Material

Author

CONNECTICUT UNIV STORRS, Adamson, Douglas H, Oyer, Andrew J, CONNECTICUT UNIV STORRS, Adamson, Douglas H, and Oyer, Andrew J

Abstract

The resources provided by this award allowed for the development of two thermally conductive nanofillers whose production at large scale was not previously possible. These fillers, pristine graphene and functionalized boron nitride, have high thermal conductivity coupled with an extreme aspect ratio, making them strong candidates for thermally conductive composites. In the past, the insolubility of pristine graphene required the use of either graphene oxide (GO) or reduced graphene oxide (rGO). While providing solubility, the oxidation also severely reduced the thermal conductivity of the material. The methods developed in the work supported by this grant allow for the use of un-oxidized and un-damaged graphene for thermal composites and include the use of a self-assembling solvent mixture and an interfacial trapping method. Boron nitride was exfoliated for the first time in large quantities. Boron nitride, unlike graphite, is electrically insulating and thus is a complimentary material to graphene. A thermal functionalization and exfoliation procedure was developed and a manuscript describing the work is currently being reviewed. Together, these new materials provide the foundation for a new class of thermally conductive composite materials. Details of the work preformed are available in the archival publications and PhD thesis supported by the award., The original document contains color images.

Published
2014

61. Thermal and Electrical Properties of Nanocomposites Based on Self-Assembled Pristine Graphene.

Author

Bento, Jennifer L., Brown, Elizabeth, Woltornist, Steven J., and Adamson, Douglas H.

Subjects
NANOCOMPOSITE materials, THERMODYNAMICS, POLYMERIZATION, THERMAL conductivity, ELECTRIC conductivity
Abstract

Thermodynamically-driven exfoliation and self-assembly of pristine graphene sheets is shown to provide thermally and electrically functional polymer composites. The spreading of graphene sheets at a high energy liquid/liquid interface is driven by lowering the overall energy of the system, and provides for the formation of water-in-oil emulsions stabilized by overlapping graphene sheets. Polymerization of the oil phase, followed by removal of the dispersed water phase, produces inexpensive and porous composite foams. Contact between the graphene-stabilized water droplets provides a pathway for electrical and thermal transport through the composite. Unlike other graphene foams, the graphite used to synthesize these composites is natural flake material, with no oxidation, reduction, sonication, high temperature thermal treatment, addition of surfactants, or high shear mixing required. The result is an inexpensive, low-density material that exhibits Joule heating and displays increasing electrical conductivity with decreasing thermal conductivity. [ABSTRACT FROM AUTHOR]

Published
2017
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81. Waxy Gels with Asphaltenes 2: Use of Wax Control Polymers

Author

Tinsley, Jack F., primary, Jahnke, Justin P., additional, Adamson, Douglas H., additional, Guo, Xuhong, additional, Amin, Devang, additional, Kriegel, Robert, additional, Saini, Rajesh, additional, Dettman, Heather D., additional, and Prud’home, Robert K., additional

Published
2009
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