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Magnetic cellulose gel enables acoustic apps in cars

Posted: 26 Nov 2013     Print Version  Bookmark and Share

Keywords:magnetic cellulose membrane  wood pulp 

Researchers from KTH Royal Institute of Technology have developed what they claim as the world's first magnetic cellulose membrane loudspeakers to the list of products that can be produced from wood. According to them, the flat, sonorous and environmentally-friendly speakers are made with a novel material derived from wood pulp. Unlike ordinary speakers, they require no heavy permanent magnets.

Richard Olsson, a KTH researcher in chemical sciences who supervised the doctoral research behind the magnetic cellulose gel, said the material may open the way for innovations in such areas as acoustic applications for automobiles.

Olsson and his colleagues at KTH, Lars Berglund, also a researcher in chemical sciences, and Valter Ström, a scientist in engineering physics of materials, recently demonstrated the speakers for the first time.

Magnetic cellulose gel enables acoustic apps in cars

Figure 1: The ultrathin, magnetic cellulose speakers at work.

"This is, to our knowledge, the first reported magnetic speaker membrane," Olsson noted. He stated that the sound quality is at least as good as in conventional speakers, possibly better because of the even distribution of forces created in the membrane.

The idea is to show the potential of natural and environmentally-sustainable materials in everyday products. "We want to use this first prototype to see how the cellulose can be used in new applications," he indicated.

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