JoVE Engineering encompasses a broad range of experimental and instrumental techniques utilized in physics research. Investigations in this area strive to address and answer a broad range of scientific questions, such as device mechanisms and efficiencies, using physical tools. This approach often requires a combination of specialties, and research in this area tends to be interdisciplinary with contributions from mechanical, electrical, and chemical engineers.
1Institute of Shock Physics, Imperial College London
Fracture and fragmentation are late stage phenomena in dynamic loading scenarios and are typically studied using explosives. We present a technique for driving expansion using a gas gun which uniquely enables control of both loading rate and sample temperature.
Published June 28, 2015. Keywords: Engineering, Shock Physics, Fracture, Fragmentation, High Strain Rate, Expanding Cylinder, Ti-6Al-4V
1Fraunhofer Institute for Ceramic Technologies and Systems, 2Dresden Center for Nanoanalysis, Technische Universität Dresden, 3Globalfoundries Fab 8, 4Globalfoundries Fab 1
The time-dependent dielectric breakdown (TDDB) in on-chip interconnect stacks is one of the most critical failure mechanisms for microelectronic devices. This paper demonstrates the procedure of an in situ TDDB experiment in the transmission electron microscope, which opens a possibility to study the failure mechanism in microelectronic products.
Published June 26, 2015. Keywords: Engineering, Time-dependent dielectric breakdown, reliability, copper interconnect, degradation kinetics, in situ TEM, ultra-low-k (ULK) material
1Bioengineering Department, University of Louisville
Here, we present a protocol to fabricate freely-suspended, micron/sub-micron scale polymer fibers and “web-like” structures generated via automated direct writing procedure by means of a 3-axis dispensing system.
Published June 12, 2015. Keywords: Engineering, Direct write, precise control, micro/sub-micron scale fibers, 3-axis robot, dispensing system
1School of Electrical Engineering & Telecommunications, University of New South Wales, 2QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University
The fabrication process and experimental characterization techniques relevant to single-electron pumps based on silicon metal-oxide-semiconductor quantum dots are discussed.
Published June 3, 2015. Keywords: Engineering, Physics, Silicon, Quantum Dots, Quantum Metrology, Nanoelectronics, Charge Pumping
1Nanoscale Devices Laboratory, Marquette University
Here, we present three protocols for thermal measurements in microfluidic devices.
Published June 3, 2015. Keywords: Engineering, Thermal Particle Detection, Thermal Wave Analysis, Heat Penetration Time, Thermal Time Constant, Enthalpy Assay, Thermal Conductivity and Specific Heat
1Department of Mechanical Engineering, Massachusetts Institute of Technology, 2Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, 3School of Engineering and Applied Sciences, Harvard University, 4Department of Materials Science and Engineering, Massachusetts Institute of Technology, 5Department of Chemistry & Chemical Biology, Harvard University
Tin sulfide (SnS) is a candidate material for Earth-abundant, non-toxic solar cells. Here, we demonstrate the fabrication procedure of the SnS solar cells employing atomic layer deposition, which yields 4.36% certified power conversion efficiency, and thermal evaporation which yields 3.88%.
Published May 22, 2015. Keywords: Engineering, Solar cells, thin films, thermal evaporation, atomic layer deposition, annealing, tin sulfide
1Power Electronics Branch, Naval Research Laboratory, 2Physics of Electronic Materials Branch, Naval Research Laboratory
This report describes the use of a custom-built system to perform aerosol deposition of thick films of yttrium iron garnet onto sapphire substrates at RT. The deposited films are characterized using scanning electron microscopy, profilometry, and ferromagnetic resonance to give a representative overview of the capabilities of the technique.
Published May 15, 2015. Keywords: Engineering, aerosol deposition, yttrium iron garnet, microwave materials, radio frequency materials, thick film, ferromagnetic resonance, cold spray coating, room temperature, ceramics, multifunctional materials, ferrites, oxides
1Department of Mechanical Engineering, University of British Columbia
Two experimental devices for examining liquid jet impingement on a high-speed moving surface are described: an air cannon device and a spinning disk device. The apparatuses are used to determine optimal approaches to the application of liquid friction modifier (LFM) onto rail tracks for top-of-rail friction control.
Published April 17, 2015. Keywords: Engineering, Liquid jet impingement, high-speed moving surface, spray nozzle, liquid friction modifier (LFM), air cannon, spinning disk, rail track lubrication, fluid mechanics
1Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart
This movie shows how an atmospheric plasma torch can be ignited by microwaves with no additional igniters and provides a stable and continuous plasma operation suitable for plenty of applications.
Published April 16, 2015. Keywords: Engineering, atmospheric pressure plasma, microwave plasma, plasma ignition, resonator structure, coaxial resonator, cylindrical resonator, plasma torch, stable plasma operation, continuous plasma operation, high speed camera
1School of Mechanical Engineering, Korea University
A protocol for conducting thermopower wave experiments is presented. The synthesis of hybrid composites of a chemical fuel and micro/nanostructured material, manufacturing of a thermopower wave generator, and methods for measuring the corresponding physical phenomena are described.
Published April 10, 2015. Keywords: Engineering, thermopower wave, combustion, carbon nanotube, chemical fuel, thermal transport, energy conversion, picric acid