Search Results - "Vander Wal, Randy"

Impact of fuel formulation on the nanostructure and reactivity of diesel soot by Yehliu, Kuen, Vander Wal, Randy L., Armas, Octavio, Boehman, André L.

“…The work focuses on the impact of fuel on soot reactivity and nanostructure. A 2.5L, 4-cylinder, turbocharged, common rail, direct injection light-duty diesel…”
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Effect of hydrogen concentration on graphene synthesis using microwave-driven plasma-mediated methane cracking by Singh, Madhu, Sengupta, Arupananda, Zeller, Kurt, Skoptsov, George, Vander Wal, Randy L.

“…Gas phase graphene forms as an aerosol in a microwave plasma among other carbon forms. Consisting of 2–6 sheets per stack with dimensions between 100 and…”
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Thermo-Catalytic Decomposition Comparisons: Carbon Catalyst Structure, Hydrocarbon Feed and Regeneration by Mpila Makiesse Nkiawete, Randy Vander Wal

“…Thermo-catalytic decomposition (TCD) activity and stability depend upon the initial carbon catalyst structure. However, further transitions in the carbon…”
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XPS Analysis of Combustion Aerosols for Chemical Composition, Surface Chemistry, and Carbon Chemical State by Vander Wal, Randy L, Bryg, Vicky M, Hays, Michael D

“…Carbonaceous aerosols can vary in elemental content, surface chemistry, and carbon nano-structure. Each of these properties is related to the details of soot…”
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Effect of carbonization methods on graphitization of soft and hard carbons by Ike, Sandra, Wal, Randy Vander

“…Pressurized carbonization is known to improve carbon content and create textural changes in resultant carbon compared to conventional (atmospheric)…”
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Development of an HRTEM image analysis method to quantify carbon nanostructure by Yehliu, Kuen, Vander Wal, Randy L., Boehman, André L.

“…An analytical method for analyzing high-resolution transmission electron microscopy (HRTEM) images is presented. The method is composed of two major parts:…”
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Impact of Biofuel Blends on Black Carbon Emissions from a Gas Turbine Engine by Kumal, Raju R, Liu, Jiawei, Gharpure, Akshay, Vander Wal, Randy L, Kinsey, John S, Giannelli, Bob, Stevens, Jeffrey, Leggett, Cullen, Howard, Robert, Forde, Mary, Zelenyuk, Alla, Suski, Kaitlyn, Payne, Greg, Manin, Julien, Bachalo, William, Frazee, Richard, Onasch, Timothy B, Freedman, Andrew, Kittelson, David B, Swanson, Jacob J

“…Presented here is an overview of nonvolatile particulate matter (nvPM) emissions, i.e., “soot”, as assessed by TEM analyses of samples collected after the…”
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Predictive Model Development for Aviation Black Carbon Mass Emissions from Alternative and Conventional Fuels at Ground and Cruise by Abrahamson, Joseph P, Zelina, Joseph, Andac, M. Gurhan, Vander Wal, Randy L

“…The first order approximation (FOA3) currently employed to estimate BC mass emissions underpredicts BC emissions due to inaccuracies in measuring low smoke…”
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NdFeB Permanent Magnet Uses, Projected Growth Rates and Nd Plus Dy Demands across End-Use Sectors through 2050: A Review by James W. Heim, Randy L. Vander Wal

“…Rare earth element (REE) permanent magnets (NdFeB) are a critical element in a vast and growing number of industrial applications. In consumer electronics, a…”
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The role of fuel chemistry in dictating nanostructure evolution of soot toward source identification by Singh, Madhu, Vander Wal, Randy L.

“…Laser derivatization is proposed as a diagnostic technique toward identifying the sources contributing to combustion produced soot. Fuel chemistry and the…”
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Improved quantification of curvature in high-resolution transmission electron microscopy lattice fringe micrographs of soots by Wang, Chang’an, Huddle, Thomas, Huang, Chung-Hsuan, Zhu, Wenbo, Vander Wal, Randy L., Lester, Edward H., Mathews, Jonathan P.

“…Soot affects climate change and human health. Its structure is influenced by fuel and combustion conditions. Image analysis of high-resolution transmission…”
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Templating-induced graphitization of novolac using graphene oxide additives by Ike, Sandra N, Wal, Randy Vander

“…Increasing graphite demand for energy storage applications creates the need to make graphite using precursors and processes that are affordable and friendly to…”
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Pulsed laser annealing of carbon black by Abrahamson, Joseph P., Singh, Madhu, Mathews, Jonathan P., Vander Wal, Randy L.

“…Laser heating was used to study the rates and trajectories of carbon black during the earliest stages of annealing. A commercial carbon black, Regal 250 (R250…”
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Initial Investigation of Effects of Fuel Oxygenation on Nanostructure of Soot from a Direct-Injection Diesel Engine by Vander Wal, Randy L, Mueller, Charles J

“…The oxidation rate of a soot sample is related to its nanostructure, that is, to the curvature and relative orientations of its constituent molecular layers…”
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Nanostructure Quantification of Carbon Blacks by Singh, Madhu, Vander Wal, Randy

“…Carbon blacks are an extensively used manufactured product. There exist different grades by which the carbon black is classified, based on its purpose and end…”
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Carbon - carbon composites: Effect of graphene size upon the nano-micro - structure and material properties by Singh, Madhu, Vander Wal, Randy

“…This work aims to address the effect of filler size in the formation of Carbon-carbon (C-C) composites using two carbon-based matrices that show opposite…”
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Reconciliation of carbon oxidation rates and activation energies based on changing nanostructure by Gaddam, Chethan K., Vander Wal, Randy L., Chen, Xu, Yezerets, Aleksey, Kamasamudram, Krishna

“…HRTEM reveals the nanostructure of the model carbons and changes therein due to oxidation. The variation in oxidation rates during the oxidation process…”
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Impact of engine operating modes and combustion phasing on the reactivity of diesel soot by Yehliu, Kuen, Armas, Octavio, Vander Wal, Randy L., Boehman, André L.

“…The present work focuses on the impacts of engine operating conditions and combustion phasing on diesel soot properties. The study was carried out in a 2.5L…”
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Characterization of the particulate emissions from the BP Deepwater Horizon surface oil burns by Gullett, Brian K., Hays, Michael D., Tabor, Dennis, Wal, Randy Vander

“…Sampling of the smoke plumes from the BP Deepwater Horizon surface oil burns led to the unintentional collection of soot particles on the sail of an…”
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A Laboratory Comparison of Emission Factors, Number Size Distributions, and Morphology of Ultrafine Particles from 11 Different Household Cookstove-Fuel Systems by Shen, Guofeng, Gaddam, Chethan K, Ebersviller, Seth M, Vander Wal, Randy L, Williams, Craig, Faircloth, Jerroll W, Jetter, James J, Hays, Michael D

“…Ultrafine particle (UFP) emissions and particle number size distributions (PNSD) are critical in the evaluation of air pollution impacts; however, data on UFP…”
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