Blog Posts

sexta-feira, 7 de janeiro de 2011

Windsurfer, e outras coisas

Para encomendarem as vossas Antenas Wi-fi, directamente à Ponoko:

É claro que é grátis!

Vão aqui:

Coisas do Arco da Velha, um novo Corante que tanto pode amplificar a produção solar, como produzir Hidrogénio como nunca antes visto!

New dyes to benefit solar electricity and hydrogen fuel production

By Grant Banks

Researchers have made a two-fold breakthrough in advancing renewable energies with the development of a light sensitive dye which transfers electrons more efficiently than conventional technologies. The new dyes stand to be used in solar electricity generation and in creating hydrogen fuel, which in the past has proven expensive and energy hungry.
The chalcogenorhodamine dyes have been pioneered by chemists at the University of Buffalo (UB) along with their partners at the University of Rochester (UR). As sunlight strikes the dyes electrons are released allowing these available electrons to be used in one of two ways. In the solar cell application, where the dye can be used as part of a conventional dye-sensitive solar cells (DSSC), the newly freed electrons are able to travel through the solar cell, forming an electrical current. This is much like existing technology but offers greater efficiency.

Mais uma Bateria que aparentemente, dura para sempre:

A battery operates continuously in Romanian museum since 1950

by Terrence Aym

For more than three centuries inventors—usually crackpots—have sought the elusive fantasy of a perpetual motion machine.

Now investigators of an amazing object stuck in the dusty corners of an obscure Romanian museum may have found the next best thing: a perpetual battery.

Whether a battery that has operated continuously since 1950 without a recharge can be termed perpetual may be open to debate, yet the fact remains that the remarkable device has never ceased working and doesn't look like it's about to give up the ghost anytime soon.

E usar Carbono para criar Plástico!

CO2 could be used in 'green' plastic production

By Ben Coxworth

Excess carbon dioxide in the atmosphere has certainly become an environmental concern in recent years, but researchers from Germany’s Fraunhofer Institute for Environmental, Safety and Energy Technology are now experimenting with a process that uses CO2 to process plastic products in an environmentally-friendly fashion. They have discovered that by compressing the gas, it can be used to impregnate plastic objects with dyes, antibacterial compounds, or other substances. Traditionally, toxic solvents have been used for coloring plastic items.
The Fraunhofer team pump CO2 into a high-pressure container already containing the plastic parts and powdered pigment, then heat it to 30.1C (86.18F) and compress it to 73.8 bar. At this point, it goes into a supercritical state and takes on solvent-like properties. The team then continue to increase the pressure, until at 170 bar the pigment dissolves into the CO2, and then proceeds to diffuse into the plastic. The whole process only takes a few minutes, and while the gas itself escapes from the plastic afterward, the pigment stays in and cannot be wiped off.

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