Studies show that mosaic loads are a direct result of environmental and sustainable development planning.
Electrified contact (CE) was the first and only source of human electricity until about the 18th century, but its true nature remains a mystery. Today it is considered a critical component of technologies such as laser printers, LCD manufacturing processes, electrostatic coatings, separation of plastics for recycling and more, as well as representing a significant industrial risk (electronic system failure, explosions in coal mines, fires in factories). chemical) for the electrostatic discharge (ESD) that accompanies the CE. A 2008 study published in temperament I found that in vacuum, the ESD of plain duct tape is so strong that it produces enough X-rays to take X-ray images of a finger.
For a long time it was believed that two contact / shear materials were loaded in opposite and uniform directions. However, after CE, it was found that the two separate surfaces carry (+) and (-) charges. The formation of the so-called charge mosaic has been attributed to the experience of the intrinsic heterogeneity of the materials in contact or to the general “random nature” of CE.
Professor Bartosz A. Grzybowski. Kredit: UNIST
A research group, led by Professor Bartosz A. Grzybowski (Department of Chemistry) of the Center for Soft and Living Materials, within the Institute for Basic Sciences (IBS) of Ulsan National Institute of Science and Technology (UNIST) For more than a decade he has been investigating the possible source of the mosaic shipments. The study is expected to help control the potentially dangerous static electricity discharge and was recently published in the journal
Figure 1. Load mosaics onto contact loaded dielectrics. (a) In a conventional view, two electrically neutral materials (gray) are brought into contact and then separated by charge evenly (bottom left), one positive (red) and one negative (blue). In an alternate scenario (bottom right), each surface develops a highly non-uniform “charge mosaic” with neighboring domains of opposite charge polarity. (b) Collage of charge mosaics reported in literature (years and scale bars are indicated). Credit: UNIST
In the document recently published in Physics of nature, Professor Grzybowski’s group shows that charge mosaics are a direct consequence of ESD. Experiments show that sequences of “sparks” are created between the delamination materials, responsible for the formation of symmetrical (+/-) charge distributions on both materials.
“One might think that a discharge could only lead to zero charges, but it can actually reverse them locally. 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 article.” Even when the charges are reduced to zero, the spark continues to function powered by the field of adjacent regions untouched by this spark. “
The proposed theory explains why charge mosaics have been seen on many different materials, including sheets of paper, rubbing balloons, steel balls rolling on Teflon surfaces, or polymers detached from it or other polymers. It also suggests the origin of the crackle when peeling off an adhesive tape – it could be a manifestation of the
“data-gt-translate-attributes =”[{“attribute=””>plasma[{“attribute=””>plasma[{“attribute=””>plasma[{“attribute=””>plasma download by plucking the tape like a guitar string. The research presented should help control potentially harmful electrostatic discharges and bring us closer to a true understanding of the nature of contact electrification, the research team noted.
References: “Charge mosaics on contact electrified dielectrics result from polarity reversal discharges” by Yaroslav I. Sobolev, Witold Adamkiewicz, Marta Siek and Bartosz A. Grzybowski, 8 September 2022, Physics of nature.
DOI: 10.1038 / s41567-022-01714-9
“Correlation between nanosecond X-ray flashes and stick-slip friction in adhesive 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 HT Baytekin, AZ Patashinski, M. Branicki, B. Baytekin, S. Soh and BA Grzybowski, June 23, 2011, Science.
DOI: 10.1126 / science.1201512
