Thurnauers insights into plants and chlorophyll, the light-absorbing molecule that makes vegetation green, has potential impact on research as diverse as breaking down hazardous waste into harmless compounds and perhaps even repairing faulty DNA.
The key is keeping the energy transfer moving forward, said Thurnauer, who is a biophysical chemist at Argonne National Laboratory in Illinois. Her work focuses on the earliest steps of photosynthesis, the process that converts light into chemical energy to drive the growth, repair and reproduction of plants.
The first reaction to take place is a separation of electrical charge, she said. Light is absorbed, the energy excites the chlorophyll molecules, and a fast electron transfer sets up the charge separation.
Intrigued, Thurnauer and her team then made a laboratory version of the energy pump that keeps the negatively charged electrons away from the positively charged holes they leave behind. Moving electrons in a controlled manner can be a way to chemically neutralize toxic compounds, for example.
Their laboratory system uses nanocrystalline particles of metal oxides. As light pumps energy into a particle, electrons from molecules attached to the surface of the particle can move into the particle. The greater the distance between the excited electrons and the resulting holes, the more likely the energy transfer will keep moving forward that is, the conversion of light to chemical energy.
Thurnauer, whose aunt became a physicist in the days when few women were in science, said family influence led h
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Contact: Sharon Worthy
s_worthy@acs.org
202-872-4371
American Chemical Society
4-Apr-2002