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Current-induced breakdown is investigated for carbon nanofibers ͑CNF͒ for potential interconnect applications. The measured maximum current density in the suspended CNF is inversely proportional to the nanofiber length and is independent of diameter. This relationship can be described with a heat transport model that takes into account Joule heating and(More)
—To elucidate the observed current capacity behavior , a model is developed that takes into account heat transport through the entire carbon nanofiber interconnect test structure and breakdown location. The model also includes variations in contact location with the support material. The resulting predicted heat dissipation and current capacity are(More)
ii iii Acknowledgements I cannot heap enough praise on my two advisors, Tim Colonius and Richard Mur-ray, who have contributed immeasurably both to this thesis and to my overall happiness at Caltech these past years. I also thank Jerry Marsden, who has served almost as a third advisor to me, and Tony Leonard, for serving on my thesis committee and for(More)
Experiments using active control to reduce oscillations in the flow past a rectangular cavity have uncovered surprising phenomena: in the controlled system , often new frequencies of oscillation appear, and often the main frequency of oscillation is split into two sideband frequencies. The goal of this paper is to explain these effects using physics-based(More)
We study the performance and reliability of carbon nanofiber ͑CNF͒ interconnects under high-current stress by examining CNF breakdown for four test configurations, suspended/supported with/without tungsten deposition. The use of W is to improve the CNF-electrode contact. The supported cases show a larger current density just before breakdown than the(More)
An experimental investigation of acoustic mode noise suppression was conducted in a cavity using a digital controller with a linear control algorithm. The control algorithm was based on flow field physics similar to the Rossiter model for acoustic resonance. Details of the controller and results from its implementation are presented in the companion paper(More)
Current-induced breakdown phenomena of carbon nanofibers (CNFs) for future on-chip interconnect applications are presented. The effect of heat dissipation via the underlying substrate is studied using different experimental configurations. Scanning electron microscopy (SEM) techniques are utilized to study the structural damage by current stress. While the(More)
The flow field around a sphere falling at its terminal velocity in a column of viscoelastic non-shear-thinning fluid is experimentally measured with digital particle image velocimetry. The working fluid is an extensively characterized, monodisperse, polystyrene based Boger fluid. The sphere radius relative to the radius of the column of fluid is small (a/r(More)
In a carbon nanofiber ͑CNF͒-metal system such as a bridge between two gold electrodes, passing high current ͑current stressing͒ reduces the total resistance of the system ͑CNF resistance R CNF plus contact resistance R c ͒ by orders of magnitude. The role of current stressing is modeled as a reduction in the interfacial tunneling gap with transport(More)
A joint experimental and computational methodology is developed and applied to investigate a vortex ring impinging normally on a wall. The method uses digital particle image velocimetry to make planar flow measurements, which are then used to initialize a second-order finite difference calculation. The experiment and the simulation are compared at later(More)