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The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
  • 2014-06-02 03:00:00
  • Article ID: 618671

NUS Scientists Demonstrate Rare Chemical Phenomenon That Could Be Harnessed to Harvest Solar Energy

Landmark study opens doors to further studies into chemical modification of materials for alternative energy conversion

  • Credit: National University of Singapore

    PhD candidate Mr Raghavender Medishetty (left) and Professor Jagadese J Vittal (right), Department of Chemistry at the NUS Faculty of Science

  • Credit: National University of Singapore

    A schematic diagram showing the popping nature of the crystals under UV light, a property that is very similar to the popping of corns on a hot plate.

A team of international scientists led by Professor Jagadese J Vittal of the Department of Chemistry at the National University of Singapore’s (NUS) Faculty of Science has successfully unraveled the chemical reaction responsible for propelling microscopic crystals to leap distances up to hundreds of times their own size when they are exposed to ultraviolet (UV) light.

This popping effect, akin to the bursting of popcorn kernels at high temperatures, demonstrates the conversion of light into mechanical motion. It is the first instance of a “photosalient effect” driven by a photochemical reaction in solids to be reported. The rare phenomenon provides a new way to transfer light energy into mechanical motion, and potentially offers a fresh approach to harness solar energy to power light-driven actuators and mechanical devices.

These novel findings were published as the cover story in the English version of German scientific journal Angewandte Chemie International Edition on 2 June 2014.

Popcorn-like explosion of tiny crystals demonstrated

The NUS team has been actively looking for ways to control the reactivity of solids. While studying the metal complex polymerisation in the solid state, Mr Raghavender Medishetty, a PhD candidate, and Ms Bai Zhaozhi, a third-year undergraduate student, of the Department of Chemistry at the NUS Faculty of Science, found that very tiny crystals leap violently when exposed to UV light. Interestingly, even when the crystals are irradiated with weak UV light, the single crystals burst violently to travel up to hundreds of times their sizes. Such a distance is equivalent to that of a human jumping few hundred metres.

To understand the reactions behind the self-actuation of the crystals, the NUS team worked with a research team from the New York University Abu Dhabi led by Associate Professor Panče Naumov to capture the rapid motion of the crystals with an optical microscope coupled to a high-speed camera. They also collaborated with a research team from the Max Plank Institute for Solid State Research in Germany, led by Professor Robert E. Dinnebier to model the kinetics by time-resolved powder X-ray diffraction methods.

Through the use of a variety of analytical methods, the researchers discovered that the cause for the popping and disintegration of these single crystals was due to the strain generated during the photochemical reaction in the crystal, leading to the formation of metal coordination polymers. Sudden expansion of volume during this reaction results in the release of the stress in the form of ballistic events. Such a chemical reaction is very similar to the popping of corn kernels on a hot plate as a result of rapid expansion of the inner kernel compared to the outer shell.

Elaborating on the findings, Prof Vittal said, “Photoactuated movements are induced by the application of light to certain type of crystals, but they are observed to be less efficient than the biomechanical motions of plant and animal tissues. In our work, we observed that the conversion of energy in the crystals may be able to mimic the motility of biological systems and provide a new way to transfer light energy into mechanical motion.”

He added, “Our work validates that the so called “bad” UV light from sources such as the sun can be utilised to convert chemical reactions to drive mechanical motions with practical uses. Knowledge and application of such behaviour is very important towards addressing the global energy crisis.”

This study opens doors for further studies into materials for alternative energy conversion.

Further research

The NUS research team is examining a series of new compounds to better understand the mechanism and enhance the efficiency of the photosalient effect. They are also conducting systematic studies to look into the effects of chemical modification on the photosalient effect.

The team hopes to eventually develop new materials that could convert solar energy effectively into mechanical energy. In addition, the team also hopes to leverage on the principle of the photosalient effect to create a new source of reversible chemical energy by controlling the shape and size of crystals used for energy conversion.

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Jefferson Lab Scientist Selected to Receive Francis Slack Award

Dr. Hari Areti, has been selected to receive the Francis G. Slack Award, established by the Southeastern Section of the American Physical Society, to honor excellence in service to Physics in the Southeastern U.S.

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SLAC's Helen Quinn Honored with 2018 Benjamin Franklin Medal in Physics

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PPPL Honors Grierson and Greenough for Distinguished Research and Engineering Achievements

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The Challenge of Estimating Alaska's Soil Carbon Stocks

A geospatial analysis determined the optimal distribution of sites needed to reliably estimate Alaska's vast soil carbon.

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Molecular-level understanding of cellulose structure reveals why it resists degradation and could lead to cost-effective biofuels.

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