David B Go

David B Go
University of Notre Dame | ND · Department of Aerospace and Mechanical Engineering (AME)

Ph.D. Purdue University

About

133
Publications
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3,626
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Publications

Publications (133)
Article
Full-text available
The Extracellular RNA communication consortium (ERCC) is an NIH-funded program aiming to promote the development of new technologies, resources, and knowledge about exRNAs and their carriers. After Phase I (2013-2018), Phase 2 of the program (ERCC2, 2019-2023) aims to fill critical gaps in knowledge and technology to enable rigorous and reproducibl...
Article
Atmospheric pressure, ambient temperature plasma jets have become a promising candidate for material processing in parallel with developments in additive manufacturing. Recent work has shown that plasma jets can be used to sinter printed nanoparticles at temperatures much lower than typically required for conventional thermal sintering. Here, we co...
Article
The solvated electron is one of the strongest known reducing species. Solution-based glow discharges, in which a gaseous discharge is ignited between a metal electrode and a liquid surface, are an emerging spectrochemical source in analytical atomic emission and mass spectrometry. In other disciplines, the similar setup is called plasma electrolysi...
Article
For most metal forming processes, friction is generated at contacting asperities and usually attributed to adhesion for the common case of smooth tooling. In certain superplastic forming operations, creep is a major deformation mechanism, and realistic simulations require surface contact models that incorporate creep. In the present work, a single...
Article
Full-text available
The reactions at a plasma-liquid interface often involve species such as the solvated electron or the hydroxyl radical, which initiate the reduction or oxidation of solution-phase reactants (so-called scavengers) or are consumed by their own second-order recombination. Here, the mathematical scaling of the reaction-diffusion equations at the interf...
Article
Full-text available
Graphene is an excellent heat conductor, with the potential to be used as a heat spreader for applications where there are fast, transient heat pulses. In this study we analyze and describe energy transport in graphene subject to an initial pulse of energy. We analyze the effects of using harmonic, anharmonic, and a non-linear (Tersoff) potentials...
Article
We explore the consequences of non-thermal plasma activation on product yields in catalytic ammonia synthesis, a reaction that is equilibrium-limited at elevated temperatures. We employ a minimal microkinetic model that incorporates the influence of plasma activation on N2 dissociation rates to predict NH3 yields into and across the equilibrium-lim...
Article
Understanding plasma-surface interactions is important in a variety of emerging research areas, including sustainable energy, environmental remediation, medicine, and high-value manufacturing. Plasma-based technologies in these applications utilize surface chemistry driven by species created in the plasma or at a plasma-surface interface. Here, we...
Article
Full-text available
Silver nanofilament formation dynamics are reported for an ionic liquid (IL)‐filled solid polymer electrolyte prepared by a direct‐write process using a conductive atomic force microscope (C‐AFM). Filaments are electrochemically formed at hundreds of xy locations on a ≈40 nm thick polymer electrolyte, polyethylene glycol diacrylate (PEGDA)/[BMIM]PF...
Preprint
We explore the consequences of non-thermal plasma activation on product yields in catalytic ammonia synthesis, a reaction that is equilibrium-limited at elevated temperatures. We employ a minimal microkinetic model that incorporates the influence of plasma activation on N<sub>2</sub> dissociation rates to predict NH<sub>3</sub> yields into and acro...
Article
When a nonthermal plasma and a liquid form part of the same circuit, the liquid may function as a cathode, in which case electrons are emitted from the liquid into the gas to sustain the plasma. As opposed to solid electrodes, the mechanism of this emission has not been established for a liquid, even though various theories have attempted to explai...
Article
Full-text available
Extracellular vesicles (EV) containing microRNAs (miRNAs) have tremendous potential as biomarkers for the early detection of disease. Here, we present a simple and rapid PCR-free integrated microfluidics platform capable of absolute quantification (<10% uncertainty) of both free-floating miRNAs and EV-miRNAs in plasma with 1 pM detection sensitivit...
Article
Plasma-assisted catalysis is the process of electrically activating gases in the plasma phase at low temperatures and ambient pressure to drive reactions on catalyst surfaces. Plasma-assisted catalytic processes combine conventional heterogeneous surface reactions, homogeneous plasma-phase reactions, and coupling between plasma-generated species an...
Article
Full-text available
Non-thermal plasma-driven catalysis is an emerging subfield of heterogeneous catalysis that is particularly promising for the chemical transformation of hard-to-activate molecules (e.g. N2, CO2, CH4). In this review, we illustrate this promise of plasma- enhanced catalysis, focusing on the ammonia synthesis and methane dry reforming reactions, two...
Article
Full-text available
In situ fabrication of nanostructures within a solid-polymer electrolyte confined to subwavelength-diameter nanoapertures is a promising approach for producing nanomaterials for nanophotonic and chemical sensing applications. The solid-polymer electrolyte can be patterned by lithographic photopolymerization of poly(ethylene glycol) diacrylate (PEGD...
Article
When non-equilibrium, low-temperature plasmas and catalysts interact, they can exhibit synergistic behavior that enhances the chemical activity above what is possible with either process alone. Unlike thermal catalysis, in plasma-assisted catalysis the non-equilibrium state of the plasma produces reactive intermediates, such as excited species, tha...
Article
In this work, we present an analytic model for the interfacial behavior of hydroxyl radicals (OHaq) and solvated electrons () delivered into an aqueous solution by an atmospheric pressure low-temperature plasma. The model yields simple scaling laws for the interfacial concentration and average penetration depth into the solution in terms of a few k...
Article
Full-text available
Materials with reconfigurable optical properties are candidates for applications such as optical cloaking and wearable sensors. One approach to fabricate these materials is to use external fields to form and dissolve nanoscale conductive channels in well‐defined locations within a polymer. In this study, conductive atomic force microscopy is used t...
Article
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Correlations between the energies of elementary steps limit the rates of thermally catalysed reactions at surfaces. Here, we show how these limitations can be circumvented in ammonia synthesis by coupling catalysts to a non-thermal plasma. We postulate that plasma-induced vibrational excitations in N2 decrease dissociation barriers without influenc...
Article
Exosomes carry microRNA biomarkers, occur in higher abundance in cancerous patients than in healthy ones, and because they are present in most biofluids, including blood and urine, can be obtained non-invasively. Standard laboratory techniques to isolate exosomes are expensive, time-consuming, provide poor purity, and recover on the order of 25% of...
Article
Full-text available
When gas discharge and plasma devices shrink to the microscale, the electrode distance in the device approaches the mean free path of electrons and they experience few collisions. As microscale gas discharge and plasma devices become more prevalent, the behavior of discharges at these collisionless and near-collisionless conditions need to be under...
Article
Full-text available
The total internal reflection absorption spectroscopy (TIRAS) method presented in this article uses an inexpensive diode laser to detect solvated electrons produced by a low-temperature plasma in contact with an aqueous solution. Solvated electrons are powerful reducing agents, and it has been postulated that they play an important role in the inte...
Article
Full-text available
Thermionic energy conversion (TEC) is the direct conversion of heat into electricity by the mechanism of thermionic emission, the spontaneous ejection of hot electrons from a surface. Although the physical mechanism has been known for over a century, it has yet to be consistently realized in a manner practical for large-scale deployment. This persp...
Article
An ionic or electric wind is a bulk air movement induced by electrohydrodynamic (EHD) phenomena in a gas discharge. Because they are silent, low power, respond rapidly, and require no moving parts, ionic wind devices have been proposed for a wide range of applications, ranging from convection cooling and food drying to combustion management. The pa...
Article
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Plasmas and gas discharges in contact with liquids have played an important role in the history of chemical processing and scientific inquiry, leading to the discoveries of elements such as argon and compounds such as ozone. Recently-developed atmospheric-pressure plasma sources have renewed the study of plasma–liquid systems with applications in c...
Article
Surface acoustic waves (SAWs), are electro-mechanical waves that form on the surface of piezoelectric crystals. Because they are easy to construct and operate, SAW devices have proven to be versatile and powerful platforms for either direct chemical sensing or for upstream microfluidic processing and sample preparation. This review summarizes recen...
Article
A ring-shaped dielectric barrier discharge (DBD) was explored as a small form factor ionic wind device. Using a concentric ring electrode geometry, the DBD produced a converging ionic wind that leads to a vertical flow away from the DBD electrodes. The vertical flow was channeled through an outlet nozzle to produce a thin air jet, and a grounded au...
Article
We construct an analytic model for the electrostatic Debye layer formed at a plasma-liquid interface by combining the Gouy-Chapman theory for the liquid with a simple parabolic band model for the plasma sheath. The model predicts a nonlinear scaling between the plasma current density and the solution ionic strength, and we confirmed this behavior w...
Article
Full-text available
Nanoscale conductive filaments, usually associated with resistive memory or memristor technology, may also be used for chemical sensing and nanophotonic applications; however, realistic implementation of the technology requires precise knowledge of the conditions that control the formation and dissolution of filaments. Here we describe and characte...
Article
The elucidation of catalyst surface-plasma interactions is a challenging endeavor and therefore requires thorough and rigorous assessment of the reaction dynamics on the catalyst in the plasma environment. The first step in quantifying and defining catalyst-plasma interactions is a detailed kinetic study that can be used to verify appropriate react...
Chapter
MicroRNA detection and quantification are commonly explored techniques for diagnostic and prognostic predictions. Typically, microRNAs are extracted and purified from a biological source, converted into complementary DNA (cDNA), and amplified using real time polymerase chain reaction (RT-PCR). The number of RT-PCR cycles required to reach the thres...
Article
A thermal rectifier transmit heat asymmetrically, transmitting heat conductor in one direction and insulating heat in the opposite direction. For conduction at steady state, thermal rectification can occur naturally in systems where the thermal conductivity of the material(s) vary in space and with temperature. However, in virtually all practical a...
Article
Full-text available
In cold field and thermo-field emission, positive ions or adsorbates very close to the cathode surface can enhance emission current by both resonant and non-resonant processes. In this paper, resonant tunneling behavior is investigated by solving the one-dimensional Schrödinger equation in the presence of an ion, and the enhancement due to resonant...
Article
Capillary electrophoresis coupled with electrospray ionization typically employs two power supplies, one at each end of the capillary. One power supply is located at the proximal (injection) end of the capillary. The power supply located at the distal (detector) end of the capillary drives the electrospray. Electrophoresis is driven by the differen...
Article
Full-text available
As the consumer demand for smaller, more sophisticated computers grows, the need arises for new air cooling methods that will work in geometries that mechanical fans cannot. Ionic winds (also known as electrohydrodynamic flows) are flows that are produced by the generation of a gas discharge. These flows do not require moving parts to operate, maki...
Article
Electrosprays are typically formed by the application of a high (kilovolt) voltage to the flow exiting a small diameter capillary, and they have been used in applications ranging from material synthesis to spray coating because of the finely controlled plume of micron-sized droplets they produce. In this work, we report a similar but distinct spray...
Conference Paper
Selective and efficient control of C-H bond activation on a catalytic surface is paramount to convert hydrocarbons to desired chemicals.1, 2 In this presentation, we will discuss our results from studies investigating the interaction between catalytically active metal surfaces and dielectric barrier discharge plasmas at elevated temperatures. Speci...
Article
We report on the existence of a smooth transition from field emission to a self-sustained plasma in microscale electrode geometries at atmospheric pressure. This behavior, which is not found at macroscopic scales or low pressures, arises from the unique combination of large electric fields that are created in microscale dimensions to produce field-...
Article
Full-text available
Nature Communications 6 Article number:7248 (2015); Published: 19 June 2015; Updated 6 June 2016. We have discovered an error in the original data analysis of our publication, which significantly impacts the model parameters derived from experiment. Specifically, the correction changes our estimations of the average penetration depth l and scavengi...
Article
We report the covalent bonding enabled modulation of the interfacial thermal conductance between graphene and metals Cu, Al, and Pt by controlling the oxidation of graphene. By combining comprehensive X-ray photoelectron spectroscopy (XPS) analysis and time-domain thermoreflectance measurements, we quantify the effect of graphene oxidation on inter...
Article
Recent shale gas discoveries and advances in plasma chemistry provide basis to exploit metal surface-plasma interactions to precisely control C-H bond activation on catalytic surfaces, leading to improved reaction efficiencies. Although the exact determination of plasma/catalyst interactions remains a topic of continuing research, this paper provid...
Article
Full-text available
In recent studies, it has been shown that cold field emission can be an important electron source in microscale discharges. However, if the cathode is heated to a high temperature, thermal emission also becomes significant, which impacts microscale discharge formation. Importantly, in both cold and thermal conditions, the local electric field at th...
Article
In this work, we use an atmospheric-pressure plasma in argon as a cathode to electrochemically reduce carbon dioxide in aqueous solution. Using optical absorption spectroscopy, we directly show that solvated electrons reduce CO2(aq) to form the carboxyl radical anion CO2?(aq), and the reaction obeys 3D bulk reaction kinetics similar to those measur...
Article
Full-text available
To generate a gas discharge (plasma) in atmospheric air requires an electric field that exceeds the breakdown threshold of ∼30 kV/cm. Because of safety, size, or cost constraints, the large applied voltages required to generate such fields are often prohibitive for portable applications. In this work, piezoelectric transformers are used to amplify...
Article
Full-text available
Plasmas in contact with liquids initiate complex chemistry that leads to the generation of a wide range of reactive species. For example, in an electrolytic configuration with a cathodic plasma electrode, electrons from the plasma are injected into the solution, leading to solvation and ensuing reactions. If the gas contains oxygen, electronegative...
Article
Full-text available
Solvated electrons are typically generated by radiolysis or photoionization of solutes. While plasmas containing free electrons have been brought into contact with liquids in studies dating back centuries, there has been little evidence that electrons are solvated by this approach. Here we report direct measurements of solvated electrons generated...