An organic material that can repeatedly change shape without breaking would have many useful applications, such as artificial muscles, pumps or as a switch. Physicists at Radboud University accidentally discovered a material with that property.
They call it as the “molecular pinball machine”.
And, they demonstrate the shape-changing abilities of the material by having it fling a glass bead at high speed. In that process, the organic crystal material called 4-DBpFO delivers a force corresponding to ten thousand times its own weight.
The crystals have the unique property of significantly changing shape at small temperature variations around 180 degrees Celsius and doing so without breaking, which allows for that change to be repeated hundreds of times.
The scientific world has a large need for minute moving machines made of organic material, which can be used as fluid pumps on “labs on a chip” (LOCs). Well-known uses of LOCs include the device that allows diabetics to measure their blood sugar and nano pills that measure bodily functions. The problem with current organic crystals is that such changes in shape due to temperature quickly break the material.
The material that the researchers found does not break upon repeated change of shape, because the molecules slide across each other.
The researchers were saying that the discovery of these properties in this material was actually a stroke of luck.
Actually they were mainly studying these materials for their interesting optical properties, but when they changed the temperature under the microscope, the crystal suddenly shot away.
To be able to take further steps toward possible applications, the researchers want to study how the effect could be shifted to lower temperatures through changes in the molecular structure. They also want to investigate how they could make the material change shape by using short light pulses, so the material can be heated and cooled in a controlled manner.
News Source: Eurekalert
