Homepage of David
Physics, East Tennessee State University
That's me in the ESR lab, B-24, Brown Hall.
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recent, and All
- Over the years I have worked on a number of projects
for various companies. One project was to characterize various titanium
dioxide catalysts for the Tennessee Eastman Co. in Kingsport, TN. This
work involved heat treating and evacuating the catalysts, and then
exposing them to gases or organic solvents. The nature of the chemical
reactions that occurred on these surfaces was characterized by ESR. A picture
of the chemical preparation process is shown here.
- I have also done some consulting for the Osteonics Corp. In Allendale, NJ. Osteonics
makes titanium hip joint replacements. To overcome the rejection problem,
these devices are plasma sprayed with bone material (hydroxyapatite). The
coating is then irradiated for sterilization. The high radiation dose
caused the coating to yellow slightly. I used ESR
to characterize the nature of the radiation induced defects in the
- I am currently consulting for the Institute for Energy and Environmental Research
in Washington, DC. The Institute seeks to provide the public and policy-
makers with sound scientific and technical studies on a wide range of
issues. I have helped conduct a number of workshops on assessing the risks
of radiation to groups of atomic workers.
That's me, Ellen Kennedy (Staff member of IEER) and Arjun Makhijana (President of IEER).
- Jürgen Hüttermann (then at Regensburg)
challenged the EPR community to find and
characterize the guanine cation. He promosed a case of his local Kneitinger
beer to anyone producing ESR evidence
characterizing the guanine cation. This was
around 1982. Bill Nelson (Georgia State) and I had begun attempts to grow
guanine crystals in strong acid. We succeeded in growing several good size
crystals of guanine hydrochloride monohydrate and of guanine hydrochloride
dihydrate (actually from the same preparation).
We began the ESR/ENDOR
liquid helium and liquid nitrogens that summer.
Our original experiments were rather dissappointing.
- At that time I had also begun a collaboration
with Einar Sagstuen (Univ. Of Oslo). We talked about trying to repeat our EPR experiments, and succeeded in producing the
following angular plot of the ESR data.
This is the X-band ESR angular plot of guanine
hydrochloride monohydrate, x-irradiated and observed at 77 K, showing evidence
of the guanine cation (the weak outer lines of the
- When Jürgen saw this spectrum he knew that we had
the guanine cation. He delivered the case of Kneitinger to me at the Faraday Discussion Meeting in
Leicester in 1984.
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