Dr. Widegren attended The Colorado College as an undergraduate, and graduated with a B.A. in chemistry. During the summers he did undergraduate research with Professor John L. Falconer in the Chemical Engineering Department at the University of Colorado. This undergraduate research focused on photocatalytic oxidations on titanium dioxide. Dr. Widegren's graduate studies were done in the Chemistry Department at Colorado State University with Professor Richard G. Finke. His Ph.D. thesis focused on the synthesis and catalytic properties of metal nanoparticles. After graduate school, he spent a year as a visiting professor at Adams State College, where he taught classes in general and analytical chemistry. Then Dr. Widegren accepted a NRC Postdoctoral Fellowship to study the properties of ionic liquids at NIST with postdoctoral advisor, Dr. Joseph W. Magee. He was subsequently hired as a permanent employee of NIST, and has been working for Dr. Thomas J. Bruno since that time. Dr. Widegren has published about 40 scientific articles on a wide variety of topics. Dr. Widegren is currently the NMR Facility Manager and the Division Safety Representative for the Applied Materials and Chemicals Division, is co-chair of the Boulder Laboratories Postdoctoral Poster Symposium, and president of the Board of Directors of the Commerce Children's Center. Outside of work, Dr. Widegren enjoys spending time with his wife and three daughters. He is an enthusiastic oenophile and gardener.
Vapor Pressure of Low Volatility Compounds:
Dr. Widegren is involved in a variety of research activities. One of the most extensive is the measurement of vapor pressures for low-volatility compounds. This work has included measurements on taggants for explosives (where vapor pressures are important for detection), biodiesel esters (where vapor pressures are needed for bio-refinery design), and organic aerosol formers (where vapor pressures are needed for climate modeling). The technique used to make these vapor pressure measurements is the concatenated gas saturation method.
Thermal Stability of Fuels:
Dr. Widegren also does research on the thermal stability of fuels. For example, kerosene-based rocket propellants serve the dual roles of fuel and coolant in modern rocket engines. Prior to combustion, the rocket propellant circulates through channels in the wall of the thrust chamber. Thus, the fuel carries heat away from the wall and maintains a safe wall temperature. This process, commonly referred to as regenerative cooling, exposes the fuel to high temperatures. For this reason, the thermal stability of the fuel is a key design parameter for specifying its performance. Dr. Widegren has measured the thermal stability of the kerosene-base rocket propellants RP-1 and RP-2, and has studied the effects of stabilizing additives on RP-2.
Other areas of current work include the measurement of enthalpies of adsorption for energetic compounds on construction materials (like concrete), and the permeation of energetic compounds through polymer barriers (like soda bottles). Dr. Widegren is also involved in the operation of the NMR facility in Building 2.
Widegren, J. A., Bruno, T. J. Thermal Decomposition Kinetics of Kerosene-Based Rocket Propellants. 1. Comparison of RP-1 and RP-2, Energy & Fuels 23, 5517-5522, 2009.
Widegren, J. A.; Bruno, T. J. Thermal Decomposition Kinetics of Kerosene-Based Rocket Propellants. 2. RP-2 with Three Additives, Energy & Fuels 2009, 23, 5523-5528, 2009.
Widegren, J. A.; Bruno, T. J., Thermal Decomposition Kinetics of Kerosene-Based Rocket Propellants. 3. RP-2 with varying concentrations of the additive 1,2,3,4-tetrahydroquinoline, Energy & Fuels, 25, 288-292, 2011.
Physico Chemical Characterization