Brian E. Fuchs

Inkjet-printed graphene for flexible micro-supercapacitors

Here we report our multi-institutional effort in exploring inkjet printing, as a scalable manufacturing pathway of fabricating graphene electrodes for flexible micro-supercapacitors. This effort is founded on our recent discovery that graphene oxide nanosheets can be easily inkjet-printed and thermally reduced to produce and pattern graphene electrodes on flexible substrates with a lateral spatial resolution of ∼50 µm. The highest specific energy and specific power were measured to be 6.74 Wh/kg and 2.19 kW/kg, respectively. The electrochemical performance of the graphene electrodes compared favorably to that of other graphene-based electrodes fabricated by traditional powder consolidation methods. This paper also outlines our current activities aimed at increasing the capacitance of the printed graphene electrodes and integrating and packaging with other supercapacitor materials.

Formation and structure of axisymmetric steady-state detonation mach stems in condensed explosives

Abstract High explosive detonation mach stem phenomena is a relatively new research area which has been studied only since the early 1960s. Although non-steady mach stems in gases have been studied extensively, steady state mach stems have been largely ignored, particularly in high explosives. None the less, steady state detonation mach stems are of great interest due to the observability of continuous highly overdriven detonations. In order to gain a better understanding of axisymmetric steady mach stem formation and structure in high explosives, two dimensional dynamic Lagrangian numerical simulation was done. The results are presented, along with experimental evidence that confirms the validity of the calculations.

Measuring Detonation Front Configuration Via Flash Radiography And Ultra High Speed Streak Photography

Although modern numerical computational techniques are able to predict the geometry of a complex detonation front in condensed explosives, in most instances, experimental measurements are still required to verify computational results. We have measured non-planar detonation fronts by means of flash radiography as well as multi-slit ultra-high speed streak photography. In this paper, we shall discuss the two techniques and show measurement results from the two techniques.