Blog Posts

terça-feira, 13 de março de 2012

3D basta juntar àgua?

3d instantâneo, basta juntar àgua!

Flat polymer sheets bend themselves into 3D shapes - just add water

By Ben Coxworth

When the petal of a flower is being formed, its shape is achieved by cells in one area expanding more than cells in an adjacent area. This uneven expansion causes the material to buckle, creating the desired curves and creases. Scientists from the University of Massachusetts, Amherst have taken that same principle, and applied it to flat polymer gel sheets that fold themselves into three-dimensional shapes when exposed to water. Some day, such sheets could serve a number of useful purposes.

The researchers use a photolithography process, in which parts of each sheet are masked with a thin painted-on coating, followed by an exposure to ultraviolet light. The polymer that is masked from the UV light will uniformly expand like a sponge when exposed to water. In areas that aren't masked, however, the UV light causes the molecules within the polymer to become cross-linked. This means that the material in those areas will only experience limited expansion when water is added.

Ainda no campo do 3D, notícia que vem pelos nosso amigos da Ponoko, este método também promete, Estéreo-Litografia bem mais detalhada... E bem mais rápida!

...Vejam só este vídeo!

Nanoscale 3D printing

Is this the smallest race car you’ve ever seen?

Researchers at the Vienna University of Technology have a bit of a penchant for speed. And it’s not just the nanoscale 3D printed race car that gives it away… the team there have developed a mirror guided, laser equipped 3D printer that is officially faster than any that has come before.
…printing speed used to be measured in millimetres per second – our device can do five metres in one second.
Not only is it fast, it is also remarkably accurate. The printed structures are highly detailed, yet no bigger than a grain of sand. These results are achieved using a process called two-photon lithography – developed through the combined might of specialised molecular chemists working together with mechanical engineers.

Para descontraír, este Instructable, um Raio de Plasma Stempunk, mas atenção, isto é para ser feito com cuidadinho... Altas Voltagens!

Steampunked plasma-beam generator

Hi everybody

I just returned from my steam-powered-laboratory (Dampfkraftlabor, in german) to present you my latest invention:

The Steampunked plasma-beam generator:

To get an first impression please watch this short movie

E um robot para salvar vidas, nos barcos de guerra, e um dia, nos outros também, como sempre acontece, eventualmente...

SAFFiR robot could be putting out fires on Navy ships

By Ben Coxworth

If there's one thing that you don't want happening on board a ship, it's a fire. People on board burning ships can't simply run out onto the streets, as they hopefully could in the case of a structural fire, plus many people caught belowdecks don't have windows nearby to climb out of. Then, there's also the fact that crew members fighting such fires have to work in narrow, claustrophobic passageways, instead of wide-open roads. Given that fires are particularly possible on military ships, due to attacks by enemy forces, America's Naval Research Laboratory is now developing a special something to help fight fires at sea - it's called SAFFiR, the Shipboard Autonomous Firefighting Robot.

SAFFiR will be an autonomous bipedal humanoid robot, based on the CHARLI-L1 robot created at Virginia Tech - the school is a partner in the project, as is the University of Pennsylvania.

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