Materials Science

The KIMM research team led by Dr. Bongkyun Jang and Dr. Seungmin Hyun at the Department of Nano-Mechanics has developed a battery with high safety and stretchability by mimicking the design of the scales and flexible joints found in the structure of snake scales. Upon zooming in on the battery, one can see that it consists of a hexagonal battery and flexible electrical interconnections. The stretchable structure is realized by the flexible interconnections that can freely fold and unfold.
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Schematic diagram of the powder EL device that emits light at low temperatures through heat dissipation by kirigami and air convection.
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Battery charge graphic
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The slice of carbon fiber in the microelectric circuit is electrically connected to the gold/chromium electrodes with platinum/carbon electrodes.
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The new component is made of silicon nitride and consists of nine separate waveguides (left). Each waveguide is composed of 22 spirals and can amplify light by about ten times with a noise figure of only 1.2 decibels. Each spiral (right) has an area of 1 square millimeter and the shape enables the compact design of the amplifier.
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Artist's concept of a microbial fuel cell with efficiencies boosted by silver nanoparticles
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Bacteria
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Person holding batteries
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Crystals of the material hexagonal boron nitride can be etched so that the pattern you draw at the top transforms into a smaller and razor-sharp version at the bottom. These perforations can be used as a shadow mask to draw components and circuits in graphene. This process enables a precision that is impossible with even the best lithographic techniques today. To the right are images of triangular and square holes taken with an electron microscope.
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Image of circuits
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Measuring 12 cms, the object that is to be made invisible acoustically is placed between two acrylic glass panels at the centre of the experiment. The initial acoustic field is produced by the loudspeakers in the outer ring. The 228 control sensors in the central ring record this field and transmit the data to a computer in the next room. Subsequently, 36 control sources in the centre emit a secondary signal that augments the initial field in real-time.
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Image of two cloth masks
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