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Arlington, VA, United States

Daniele M.A.,Center for Bio Molecular Science and Engineering | Knight A.J.,Naval Research Enterprise Internship Program | Roberts S.A.,Naval Research Enterprise Internship Program | Radom K.,Naval Research Enterprise Internship Program | Erickson J.S.,Center for Bio Molecular Science and Engineering
Advanced Materials

(Figure Presented).A conformal electronic decal based on a polysaccharide circuit board (PCB) is fabricated and characterized. The PCBs are laminates composed of bioderived sugars - nanocellulose and pullulan. The PCB and decal transfer are a bioactive material system for supporting electronic devices capable of conforming to biological surfaces. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA. Source

Daniele M.A.,Center for Bio Molecular Science and Engineering | Radom K.,Naval Research Enterprise Internship Program | Ligler F.S.,University of North Carolina at Chapel Hill | Adams A.A.,Center for Bio Molecular Science and Engineering
RSC Advances

A microfluidic fiber fabrication device was developed to prepare multiaxial microvessels with defined architecture and material constituency. Hydrodynamic focusing using passive wall structures directed biologically relevant macromer solutions into coaxial flow patterns, which were subsequently solidified via photopolymerization. Solid, coaxial, and triaxial microfibers as well as microtubes were generated from the multiaxial flows composed of both synthetic macromers and biomacromolecules. © 2014 the Partner Organisations. Source

Spinner N.S.,U.S. Navy | Spinner N.S.,National Research Council Italy | Mazurick R.,U.S. Navy | Mazurick R.,Naval Research Enterprise Internship Program | And 3 more authors.
Journal of the Electrochemical Society

Thermophysical properties of a commercial 18650 LiCoO2 lithium-ion battery were determined using several different techniques, including analytical, numerical and experimental methods. A reasonable level of consistency was observed in values for heat capacity, which were found to be 972 ± 92 J/kg-K from the analytical method, 814 ± 19 J/kg-K from the numerical technique, and 896 ± 31 J/kg-K from calorimetry. The value for radial thermal conductivity with the best correlation to reported literature values obtained in this study (0.219 ± 0.020 W/m-K) was found via the numerical technique, and the axial thermal conductivity was found to be 22.3 ± 1.3 W/m-K. Values for heat capacity and thermal conductivity were also determined for aluminum and Teflon as controls, and all thermophysical properties in this work were found to be within, or very close to, reported literature values. These properties will aid in the development of ongoing and future lithium-ion battery simulation models and battery management systems. © 2015 The Electrochemical Society. Source

Spinner N.S.,U.S. Navy | Spinner N.S.,National Research Council Italy | Hinnant K.M.,U.S. Navy | Hinnant K.M.,Nova Research Inc. | And 6 more authors.
Journal of Power Sources

Cylindrical 18650-type surrogate cells were designed and fabricated to mimic the thermophysical properties and behavior of active lithium-ion batteries. An internal jelly roll geometry consisting of alternating stainless steel and mica layers was created, and numerous techniques were used to estimate thermophysical properties. Surrogate cell density was measured to be 1593 ± 30 kg/m3, and heat capacity was found to be 727 ± 18 J/kg-K. Axial thermal conductivity was determined to be 5.1 ± 0.6 W/m-K, which was over an order of magnitude higher than radial thermal conductivity due to jelly roll anisotropy. Radial heating experiments were combined with numerical and analytical solutions to the time-dependent, radial heat conduction equation, and from the numerical method an additional estimate for heat capacity of 805 ± 23 J/kg-K was found. Using both heat capacities and analysis techniques, values for radial thermal conductivity were between 0.120 and 0.197 W/m-K. Under normal operating conditions, relatively low radial temperature distributions were observed; however, during extreme battery failure with a hexagonal cell package, instantaneous radial temperature distributions as high as 43-71°C were seen. For a vertical cell package, even during adjacent cell failure, similar homogeneity in internal temperatures were observed, demonstrating thermal anisotropy. © Published by Elsevier B.V. Source

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