An unbreakable screen VS generator of electricity! which is best?
Led by Professor John Oh, the Oh Research Group specializes in the self-assembly of nanomaterials. Also, while exploring the chemical properties of polyurethane-based car paints, John Oh and Twinkle Patel came up with the idea of harnessing these properties to design a self-repairing poly encumbered urea * phone screen. By working on the synthesis conditions, Twinkle Patel obtained a network of PHU polymers called vitrimer, that is to say, a material glass in appearance but retains a certain malleability. For example, if it is deformed, the network can reorganize its bonds to find its initial form. This is what makes it self-repairing. When Twinkle Patel rubs its polymer with sandpaper, 50% of scratches are repaired in 30 minutes at room temperature. With additional heat treatment, the repair is complete.
Another great idea from Twinkle Patel is to add a layer of another material to his polymer to produce a triboelectric effect. This effect is the one that generates static electricity when two materials are rubbed together. “If you rub a balloon on your hair, there is static electricity that forms. This is what happens at the nanoscale; there is an electrical charge created on the two materials”, explains Twinkle Patel. The electricity must then be transferred to the phone’s battery. We won’t rub our cell phone on our hair to recharge it, but repeated rapid contact between two materials is enough to produce the triboelectric effect. Repeated contacts like those of our thumbs on the screen!
Yes, but if the screen breaks and is repaired, will it still generate electricity? The advantage of trimers is that they retain their physical properties during their remodeling. Twinkle Patel checked it out. “We measured the voltage. Then we passed the sandpaper to generate scratches on the screen. Because of the scratches, there was less contact between the two materials, and we saw the voltage decrease. We have let the polymer repair itself, and the voltage went back to its original level,” she describes.
Twinkle Patel developed PHU’s trimer and demonstrated its electrical and self-healing properties, but this breakthrough screen has yet to be integrated into a phone. The Oh Research Group does not manufacture telephones but collaborates with Korean academics and industrialists. Twinkle Patel is therefore preparing to leave for Korea to concretize the work of his research.
*That is, a modified urea molecule with several bulky chemical groups replacing much smaller hydrogen atoms. For this research, Twinkle Patel was awarded a Concordia Graduate Student Scholarship.
What is the main generator of electricity?
The three major categories of energy for electricity generation are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable energy sources. Most electricity is generated with steam turbines using fossil fuels, nuclear, biomass, geothermal, and solar thermal energy.
How is electricity generated in a generator?
In a turbine generator, a moving fluid—water, steam, combustion gases, or air—pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy.
Why are generators used?
electric generator, also called dynamo, any machine that converts mechanical energy to electricity for transmission and distribution over power lines to domestic, commercial, and industrial customers. Generators also produce the electrical power required for automobiles, aircraft, ships, and trains.