Pakistan Christian TV

Breaking news and world news from Pakisthan Christian TV on Business, Sports, Culture. Video news. News from the US, Europe, Asia Pacific, Africa, Middle East, America.

العلماء يحلون لغزًا فيزيائيًا عمره 80 عامًا

Scientists solve an 80-year-old physics mystery

The study showed that the mosaic charge is a direct result of environmental and sustainable development planning.

Contact electrification (CE) was the first and only source of electricity for mankind until the eighteenth century, but its true nature remains a mystery. Today, it is an essential component of technologies such as laser printers, LCD manufacturing processes, electroplating, separating plastics for recycling, and more. in chemical plants) due to electrostatic discharges (ESD) associated with CE. A study published in 2008 temper nature In a vacuum, the electrostatic discharge (ESD) units of a simple duct tape are so powerful that they generate enough x-rays to take an x-ray image of a finger.

For a long time, it was believed that two connected/sliding materials charged in opposite and uniform directions. However, after CE, it was found that both discrete surfaces contain both (+) and (-) charges. The formation of the so-called charge mosaic has been attributed to experimental repeatability, the intrinsic coherence of interacting objects, or the general “coherent nature” of CE.

Professor Bartosz A.  Grzybowski

Professor Bartosz A. Grzybowski. Credit: UNIST

Professor Bartos A. From the Center for Living and Soft Matters at the Institute of Basic Sciences (IBS). A research group led by Grzybowski (Department of Chemistry). Ulsan National Institute of Science and Technology (UNIST) For more than a decade, Sarge has investigated the potential sources of mosaics. The study is expected to help control harmful electrostatic discharges and was recently published in the journal Charge Mosaics on Contact Charged Dielectrics

Figure 1. Charge mosaics on contact-charged dielectrics. (a) In a conventional view, two electrically neutral materials (grey) are brought into contact and then separated charge uniformly (lower left), one positive (red) and one negative (blue). In an alternative scenario (lower right), each surface develops a highly non-uniform ‘charge mosaic’ with neighboring domains of opposite charge polarities. (b) Collage of charge mosaics reported in the literature (the years and scale bars are indicated). Credit: UNIST

In the paper published recently in Nature Physics, the group of Professor Grzybowski shows that charge mosaics are a direct consequence of ESD. The experiments demonstrate that between delaminating materials the sequences of “sparks” are created and they are responsible for forming the (+/-) charge distributions that are symmetrical on both materials.

“You might think that a discharge can only bring charges to zero, but it actually can locally invert them. It is connected with the fact that it is much easier to ignite the ‘spark’ than to extinguish it,” says Dr. Yaroslav Sobolev, the lead author of the paper. “Even when the charges are reduced to zero, the spark keeps going powered by the field of adjacent regions untouched by this spark.”

The proposed theory explains why charge mosaics were seen on many different materials, including sheets of paper, rubbing balloons, steel balls rolling on Teflon surfaces, or polymers detached from the same or other polymers. It also hints at the origin of the crackling noise when you peel off a sticky tape – it might be a manifestation of the plasma discharges plucking the tape like a guitar string. Presented research should help control the potentially harmful electrostatic discharges and bring us closer to a true understanding of the nature of contact electrification, noted the research team.

References: “Charge mosaics on contact-electrified dielectrics result from polarity-inverting discharges” by Yaroslav I. Sobolev, Witold Adamkiewicz, Marta Siek and Bartosz A. Grzybowski, 8 September 2022, Nature Physics.
DOI: 10.1038/s41567-022-01714-9

“Correlation between nanosecond X-ray flashes and stick-slip friction in peeling tape” by Carlos G. Camara, Juan V. Escobar, Jonathan R. Hird and Seth J. Putterman, 23 October 2008, Nature
DOI: 10.1038/nature07378

“The mosaic of surface charge in contact electrification” by H. T. Baytekin, A. Z. Patashinski, M. Branicki, B. Baytekin, S. Soh and B. A. Grzybowski, 23 June 2011, Science.
DOI: 10.1126/science.1201512

See also  Pokémon Go now runs more smoothly on iPhone