Search results for: David B. Go

Items from 1 to 20 out of 31 results

article

Silver Nanofilament Formation Dynamics in a Polymer‐Ionic Liquid Thin Film by Direct Write

Zhongmou Chao, Kutay B. Sezginel, Ke Xu, Garrison M. Crouch, more

Advanced Functional Materials > 30 > 6 > n/a - n/a

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]PF₆. Although the formation time generally decreases...

article

Direct‐Write Formation and Dissolution of Silver Nanofilaments in Ionic Liquid‐Polymer Electrolyte Composites

Zhongmou Chao, Brian P. Radka, Ke Xu, Garrison M. Crouch, more

Small > 14 > 39 > n/a - n/a

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 to electrochemically form and dissolve nanoscale conductive...

article

Simultaneous isolation and preconcentration of exosomes by ion concentration polarization

Steven Marczak, Katherine Richards, Zeinab Ramshani, Elaine Smith, more

ELECTROPHORESIS > 39 > 15 > 2029 - 2038

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, these can be obtained noninvasively. Standard laboratory techniques to isolate exosomes are expensive, time consuming, provide poor purity, and recover on the order of 25% of the available exosomes. We present a new microfluidic...

article

Fast prediction of thermal distortion in metal powder bed fusion additive manufacturing: Part 1, a thermal circuit network model

Hao Peng, Morteza Ghasri-Khouzani, Shan Gong, Ross Attardo, more

Additive Manufacturing > 2018 > 22 > C > 852-868

The additive manufacturing (AM) process metal powder bed fusion (PBF) can quickly produce complex parts with mechanical properties comparable to wrought materials. However, thermal stress accumulated during PBF induces part distortion, potentially yielding parts out of specification and frequently process failure. This manuscript is the first of two companion manuscripts that introduce a computationally...

article

Fast prediction of thermal distortion in metal powder bed fusion additive manufacturing: Part 2, a quasi-static thermo-mechanical model

Hao Peng, Morteza Ghasri-Khouzani, Shan Gong, Ross Attardo, more

Additive Manufacturing > 2018 > 22 > C > 869-882

The additive manufacturing (AM) process metal powder bed fusion (PBF) can quickly produce complex parts with mechanical properties comparable to that of wrought materials. However, thermal stress accumulated during Metal PBF may induce part distortion and even cause failure of the entire process. This manuscript is the second part of two companion manuscripts that collectively present a part-scale...

chapter

Designing microscale gas discharges to enhance thermionic energy conversion

John R. Haase, David B. Go

2017 30th International Vacuum Nanoelectronics Conference (IVNC) > 170 - 171

2017 30th International Vacuum Nanoelectronics Conference (IVNC)

Thermionic energy converters (TECs) are devices that convert heat directly to electrical work via thermionic emission. In a TEC, a hot cathode emits electrons that are then collected by a cold anode. However, these emitted electrons buildup in the gap between the electrodes, retarding the flow of current. There are many strategies for combatting the build-up of negative space charge, all with benefits...

article

Enhancement of thin air jets produced by ring-shaped dielectric barrier discharges using an auxiliary electrode

Keiichiro Yoshida, Michael J. Johnson, David B. Go

Journal of Electrostatics > 2017 > 87 > C > 293-301

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 auxiliary electrode was placed at the nozzle to enhance...

article

Thermal transport in oxidized polycrystalline graphene

Xin Mu, Zhigong Song, Yanlei Wang, Zhiping Xu, more

Carbon > 2016 > 108 > C > 318-326

Grain boundaries (GBs) and the spontaneous oxidization around GB regions are inherent features of graphene. In this paper, the thermal conductivity (κ) of oxidized polycrystalline graphene (PG) is studied using molecular dynamics simulation. The κ of oxidized PG decreases as oxygen (O) coverage increases, which is due to the phonon-defect scattering. However, the relative κ reduction of oxidized PG...

article

A High Voltage Power Supply That Mitigates Current Reversals in Capillary Zone Electrophoresis-Electrospray Mass Spectrometry

Ryan J. Flaherty, Scott A. Sarver, Liangliang Sun, Greg A. Brownell, more

Journal of The American Society for Mass Spectrometry > 2017 > 28 > 2 > 247-252

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 difference in potential between these power supplies. Separations...

chapter

Resonant tunneling behavior in ion-enhanced field and thermo-field emission

Xi Tan, Nathaniel Griggs, Paul Rumbach, David B. Go, more

2016 29th International Vacuum Nanoelectronics Conference (IVNC) > 1 - 2

2016 29th International Vacuum Nanoelectronics Conference (IVNC)

Under a high electrical field, field emission current may be significantly enhanced by positive ions very close to the cathode surface. In addition to distorting the potential field to both lower and thin the potential barrier, the ion can also induce resonant tunneling, which can be a major factor in the emission current. In this study, resonant tunneling behavior has been investigated using a simple...

chapter

Effect of microscale gas discharges on thermo-field emission current

John R. Haase, David B. Go

2016 29th International Vacuum Nanoelectronics Conference (IVNC) > 1 - 2

2016 29th International Vacuum Nanoelectronics Conference (IVNC)

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 is initiated, which impacts microscale discharge formation. In both cold and thermal conditions, ionization in the discharge can create sufficient space charge to impact the emission current. In this work, we use a two-fluid...

chapter

A smooth transition from field emission to a self-sustained plasma in microscale electrode gaps at atmospheric pressure

Mihai A. Bilici, Calvin R. Boyle, R. Mohan Sankaran, John R. Haase, more

2016 IEEE International Conference on Plasma Science (ICOPS) > 1

2016 IEEE International Conference on Plasma Science (ICOPS)

We report on a smooth and reversible transition through gas breakdown in electrode gaps less than 5 μm at atmospheric pressure. This behavior is in stark contrast to the abrupt breakdown that occurs in larger electrode gaps at atmospheric pressure, and results from field emission, which produces electrons that contribute to ionization processes.

chapter

Theoretical analysis of resonant effect in ion-enhanced field emission on microplasma cathode surface

Xi Tan, Nathaniel Griggs, Paul Rumbach, David B. Go, more

2016 IEEE International Conference on Plasma Science (ICOPS) > 1

2016 IEEE International Conference on Plasma Science (ICOPS)

It has been shown that field emission is an important mechanism in emerging microplasma devices. Ions formed by electron impact ionization that are very close to the cathode may bring significant enhancement to the emission current by both resonant and non-resonant processes. In this work, we numerically solve the one-dimensional Schrödinger's equation in the presence of an ion approaching the surface,...

chapter

Tunable C-H activation via metal-plasma interaction at elevated temperatures

Jongsik Kim, Marshall S. Abbott, David B. Go, Jason C. Hicks

2016 IEEE International Conference on Plasma Science (ICOPS) > 1

2016 IEEE International Conference on Plasma Science (ICOPS)

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. Specifically, we used dry CH4 reforming as a probe reaction...

article

Analysis of geometric scaling of miniature, multi-electrode assisted corona discharges for ionic wind generation

Michael J. Johnson, Rakshit Tirumala, David B. Go

Journal of Electrostatics > 2015 > 74 > Complete > 8-14

The assisted corona discharge is a unique discharge configuration that utilizes multiple collecting electrodes to minimize the voltage required to initiate a corona discharge and to generate an ionic wind. In this work, the geometric parameters that govern the formation of the assisted corona discharge and subsequent ionic wind are evaluated. Flow velocity measurements suggest that the geometry of...

article

Coherent and incoherent phonon thermal transport in isotopically modified graphene superlattices

Xin Mu, Teng Zhang, David B. Go, Tengfei Luo

Carbon > 2015 > 83 > Complete > 208-216

Understanding the nature of phonon transport is of both fundamental and technological importance. In this paper, we demonstrate unambiguous coherent and incoherent phonon transport in ¹² C/ ¹³ C graphene superlattices using large-scale molecular dynamics simulations. Coherent phonon modes preserve their phases as they propagate through multiple interfaces. For these phonons, the superlattice...

chapter

Polar, non-centrosymmetric crystals for the generation of atmospheric pressure gas discharges

Michael J. Johnson, David B. Go

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS) > 1

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Atmospheric plasma configurations are often driven through large potentials applied to one or more electrodes. Depending on the configuration, thousands of volts are required to create breakdown in air and to initiate a discharge. To reduce the amount of potential required, inherent characteristics of certain polar non-centrosymmetric crystals are investigated to determine if they can be beneficial...

article

Comparative study of corona discharge simulation techniques for electrode configurations inducing non-uniform electric fields

Rakshit Tirumala, David B. Go

Journal of Electrostatics > 2014 > 72 > 2 > 99-106

Numerical modeling of corona discharges has followed the same set of procedures for many years. Corona discharges on large scales are modeled only for ion drift, neglecting ionization. Studies of the ionization zone are often conducted in uniform axisymmetric configurations. However, in configurations that induce non-uniform electric fields, a combination of the two procedures is necessary to accurately...

article

Environmentally opportunistic computing: A distributed waste heat reutilization approach to energy-efficient buildings and data centers

J. Zachary Woodruff, Paul Brenner, Aimee P.C. Buccellato, David B. Go

Energy & Buildings > 2014 > 69 > Complete > 41-50

With building energy consumption rising in industrial nations, new approaches for energy efficiency are required. Similarly, the data centers that house information and communications technology continue to consume significant amounts of energy, especially for cooling the equipment, which in turn produces vast amounts of waste heat. A new strategy to overcome these challenges is called environmentally...

article

Visualization of Electrolytic Reactions at a Plasma-Liquid Interface

Paul Rumbach, Nathaniel Griggs, R. Mohan Sankaran, David B. Go

IEEE Transactions on Plasma Science > 2014 > 42 > 10-1 > 2610 - 2611

A dc microplasma jet in flowing argon (Ar) gas is used to electrolyze aqueous sodium chloride (NaCl) solutions. Electrolytic reactions at the plasma-liquid interface make the solution more basic and result in H₂ gas evolution. The pH change is visualized using a pH sensitive dye, which becomes dark green under basic conditions. The basic solution created at the plasma-liquid interface is subsequently...

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INFONA - science communication portal

Search results for: David B. Go

Silver Nanofilament Formation Dynamics in a Polymer‐Ionic Liquid Thin Film by Direct Write

Direct‐Write Formation and Dissolution of Silver Nanofilaments in Ionic Liquid‐Polymer Electrolyte Composites

Simultaneous isolation and preconcentration of exosomes by ion concentration polarization

Fast prediction of thermal distortion in metal powder bed fusion additive manufacturing: Part 1, a thermal circuit network model

Fast prediction of thermal distortion in metal powder bed fusion additive manufacturing: Part 2, a quasi-static thermo-mechanical model

Designing microscale gas discharges to enhance thermionic energy conversion

Enhancement of thin air jets produced by ring-shaped dielectric barrier discharges using an auxiliary electrode

Thermal transport in oxidized polycrystalline graphene

A High Voltage Power Supply That Mitigates Current Reversals in Capillary Zone Electrophoresis-Electrospray Mass Spectrometry

Resonant tunneling behavior in ion-enhanced field and thermo-field emission

Effect of microscale gas discharges on thermo-field emission current

A smooth transition from field emission to a self-sustained plasma in microscale electrode gaps at atmospheric pressure

Theoretical analysis of resonant effect in ion-enhanced field emission on microplasma cathode surface

Tunable C-H activation via metal-plasma interaction at elevated temperatures

Analysis of geometric scaling of miniature, multi-electrode assisted corona discharges for ionic wind generation

Coherent and incoherent phonon thermal transport in isotopically modified graphene superlattices

Polar, non-centrosymmetric crystals for the generation of atmospheric pressure gas discharges

Comparative study of corona discharge simulation techniques for electrode configurations inducing non-uniform electric fields

Environmentally opportunistic computing: A distributed waste heat reutilization approach to energy-efficient buildings and data centers

Visualization of Electrolytic Reactions at a Plasma-Liquid Interface

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