We are now in a digital age where we avoid using paper most of the work is done electronically be it our bank statement, office memos etc. Today we use paper and a lot of this paper goes to waste, leading to a potential pollution problem. According to ACS researchers at Applied Materials and Interface have developed an easy to make rewritable paper.
The rewritable paper can be used to draw and print over and over again. That’s not all the messages on the paper can last for six months. The currently available options of rewritable papers can last for just a few days or months and later fade away.
We not new to the idea of rewritable papers, there have been a number of people involved in developing it for many decades. It’s has proved to be a complex task involving fabrication, chemistry which depends on the ultraviolet light to erase the writing and a constant need for energy to maintain the printed document.
Luzhuo Chen and colleagues wanted to overcome these challenges and develop a rewritable paper that can be made using simple methods and can be wiped clean simply by changing the temperature.
The researcher has used three materials stacked on top of each other. They have painted one side of the paper with a blue dye which turns colorless when heated. This is similar to the Tshirts back in 1990 which used to change colors when you touch with a warm hand.
The other side of the paper is coated with a black toner layer which helps to produce heat upon excitation with light. The researchers managed to print on the paper using a “pen: that emitted heat.
This image can last up to six months, the researchers have also been able to produce a rewritable cell phone case. The image on the paper can be erased by simply cooling down the temperature to 14F. The paper can be reused for more than 100 times.
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