[institut] Reminder - Seminar - Prof. Dr. Michael Pravica, 20 July at 11:00
Marko Nikolic
nikolic at ipb.ac.rs
Fri Jul 20 10:04:32 CEST 2018
Dear colleagues,
You are cordially invited to the seminar, which will be held on Friday,
20 July 2018 at 11:00 in the library reading room “Dr. Dragan Popović"
of the Institute of Physics Belgrade. The talk entitled
X-ray induced synthesis of a novel material: Doped
Polymeric Carbon Monoxide.
will be given by Michael Pravica, Ph.D. Professor of Physics University
of Nevada Las Vegas, USA
Abstract of the talk:
Polymeric carbon monoxide (poly-CO) can be produced by pressurizing CO
at pressures above 5 GPa. The reddish-yellow waxy material is very
unstable and decomposes into graphite and CO2 in a matter of days and is
of interest as a potentially powerful energetic material (e.g. rocket
fuel). It is also highly photosensitive. We have succeeded in
producing a variant of poly-CO which we call “doped poly-CO” by
irradiating a relatively stable material (strontium oxalate powder) with
synchrotron-produced hard x-rays (>7 keV) at ambient and high pressures.
We suspect that the sequence of x-ray induced reactions:
SrC2O4 + hυ →
SrCO3 + CO
n(CO) →
poly-CO
Here, we consider SrCO3 as the dopant. This novel material appears to
be very stable and does not decompose over periods of at least one year.
It also traps CO2 inside it for extremely long periods of time (> 1
year). We have produced doped poly-CO using different cations (Mg, Ca,
etc) and using varying pressures. The synthesized products are somewhat
varied (see figure below). It is our hope that this stable material may
have some industrial importance as a possible wide band gap
semiconductor or as a nonlinear optical material. Beyond this, certain
critical questions are addressed in this research pertaining to x-ray
induced polymerization, the surface composition of Mars, and the
possible interstellar origins of life which will be discussed.
Best regards,
Marko Nikolic
--
Marko G. Nikolic PhD
Research Associate
Photonics center
Institute of Physics Belgrade
Pregrevica 118, 11080 Belgrade, Serbia
http://www.ipb.ac.rs/
Phone: +381641446152
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