A new type of paper can be used and reused up to 20 times. What’s more, it doesn’t require any ink. Its designers think that this new technology could cut down on tons of waste — and save people tons of money.
A special dye embedded in the paper makes it printable and rewritable. The dye goes from dark to clear and back when chemical reactions move electrons around. (Electrons are the subatomic particles that orbit in the outer regions of an atom.) The paper’s color-change chemical undergoes what are known as redox reactions. Redox is short for reduction and oxidation.
Oxidation steals one or more electrons from a molecule. Rust is an example of oxidation. “When iron rusts in air, its electrons move to nearby oxygen atoms,” explains Yadong Yin. He’s a chemist at the University of California, Riverside.
Reduction is the opposite of oxidation. It adds one or more electrons. As rust oxidizes iron, the process reduces those nearby oxygen atoms. That means that they gain electrons, which have a negative charge.
When dye in the new paper is oxidized, it appears blue, red or green. (What color depends on which dye is in the paper.) When the dye on some parts is reduced, color on those areas disappears. Controlling these two reactions makes it possible to print on, erase and reuse the new paper.
The starting base of the “paper” used in the study was a clear plastic. That allowed it to show how the paper works. But the technology also could be used with glass or conventional paper — the type made from wood pulp — as long as each contains the redox dyes and the other chemically active components.
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A new type of paper can be used and reused up to 20 times. What’s more, it doesn’t require any ink. Its designers think that this new technology could cut down on tons of waste — and save people tons of money.A special dye embedded in the paper makes it printable and rewritable. The dye goes from dark to clear and back when chemical reactions move electrons around. (Electrons are the subatomic particles that orbit in the outer regions of an atom.) The paper’s color-change chemical undergoes what are known as redox reactions. Redox is short for reduction and oxidation.Oxidation steals one or more electrons from a molecule. Rust is an example of oxidation. “When iron rusts in air, its electrons move to nearby oxygen atoms,” explains Yadong Yin. He’s a chemist at the University of California, Riverside.Reduction is the opposite of oxidation. It adds one or more electrons. As rust oxidizes iron, the process reduces those nearby oxygen atoms. That means that they gain electrons, which have a negative charge.When dye in the new paper is oxidized, it appears blue, red or green. (What color depends on which dye is in the paper.) When the dye on some parts is reduced, color on those areas disappears. Controlling these two reactions makes it possible to print on, erase and reuse the new paper.พลาสติกใสฐานเริ่มต้นของ "กระดาษ" ใช้ในการศึกษาได้ ที่ได้รับอนุญาตให้แสดงวิธีการทำงานของกระดาษ แต่เทคโนโลยียังสามารถใช้กับกระจกหรือกระดาษทั่วไปคือชนิดที่ทำจากเยื่อไม้ — ตราบใดที่แต่ละประกอบด้วยสี redox และส่วนประกอบที่ใช้งานสารเคมีอื่น ๆ.
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