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SOLAR DAILY
Turning streetwear into solar power plants
by Staff Writers
Dubendorf, Switzerland (SPX) Oct 23, 2020

The newly developed solar concentrator when irradiated with blue LED light: The polymer material is so flexible that it can be bent with tweezers.

Our hunger for energy is insatiable, it even continues to rise with the increasing supply of new electronic gadgets. What's more, we are almost always on the move and thus permanently dependent on a power supply to recharge our smartphones, tablets and laptops.

In the future, power sockets (at least for this purpose) could possibly become obsolete. The electricity would then come from our own clothes. By means of a new polymer that is applied on textile fibers, jackets, T-shirts and the like could soon function as solar collectors and thus as a mobile energy supply.

Materials capable of using indirect or ambient light for energy generation are already being used in the solar industry. These materials contain special luminescent materials and are called "Luminescent Solar Concentrators", or LSC for short. The luminescent materials in the LSC capture diffuse ambient light and transmit its energy to the actual solar cell, which then converts light into electrical energy.

However, LSCs are currently only available as rigid components and are unsuitable for use in textiles because they are neither flexible nor permeable to air and water vapor. An interdisciplinary research team led by Luciano Boesel from the Laboratory for Biomimetic Membranes and Textiles has now succeeded in incorporating several of these luminescent materials into a polymer that provides precisely this flexibility and air permeability.

Well-known polymer with sophisticated properties
This new material is based on Amphiphilic Polymer Co-Networks, or APCN for short, a polymer that has long been known in research and is already available on the market in the form of silicone-hydrogel contact lenses. The special properties of the polymer - permeability to air and water vapor as well as flexibility and stability - are also beneficial to the human eye and are based on special chemical properties.

"The reason we chose exactly this polymer is the fact that we are capable of incorporating two immiscible luminescent materials at the nano scale and let them interact with each other. There are, of course, other polymers, in which these materials could be integrated; but this would lead to aggregation, and the production of energy would thus not be possible", explains Boesel.

Bright solar concentrators for clothing
In collaboration with colleagues from two other Empa labs, Thin Films and Photovoltaics and Advanced Fibers, Boesel's team added two different luminescent materials to the gel tissue, turning it into a flexible solar concentrator.

Just as on large-scale (rigid) collectors, the luminescent materials capture a much wider spectrum of light than is possible with conventional photovoltaics. The novel solar concentrators can be applied to textile fibers without the textile becoming brittle and susceptible to cracking or accumulating water vapor in the form of sweat. Solar concentrators worn on the body offer an immense benefit for the ever-increasing demand for energy, especially for portable devices.

Research paper


Related Links
Swiss Federal Laboratories For Materials Science And Technology (EMPA)
All About Solar Energy at SolarDaily.com


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SOLAR DAILY
Studying new solar tracking strategies to maximize electric production
Cordoba, Spain (SPX) Oct 20, 2020
From making a small calculator work to generating energy to produce the entire output of an important brewery, solar energy has been undergoing significant growth in recent years, taking the place of nonrenewable energy resources that negatively affect the environment. In addition to producing clean energy, solar plants can be adapted to different sizes and allow for self-consumption. Over the last few years, their profitability as compared to other kinds of energy has become increasingly greater ... read more

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