nanofluids

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Here’s a headline you’ve probably seen before: “IBM creates brain-like computer chip.” Here’s a more exciting one: “New IBM circuit works in three dimensions, flips switches with atoms.” Heck, both are exciting. The latter’s just, for lack of a more appropriate cliché, a bit more mind-boggling. IBM scientists described a new kind of circuit in a paper published in Science on Thursday. There is no chip involve, per se. It’s being described accurately as a “post-silicon transistor” and potentially paves the way for the most powerful and efficient computers the world has ever seen. This is possible largely because it mimics the behavior of another hyper-efficient computational marvel: the human brain. The new so-called nanofluidic circuit works a little bit like a network of streams. A charged fluid moves over the surface of the circuit changing its properties (e.g. flipping a switch “on” or “off”) with the positively and negatively charged atoms in the fluid. Like the synapses of the brain, the ions operate in three dimensions, a game changer in terms of efficiency and uncharted territory in terms of computing. “We could form or disrupt connections just in the same way a synaptic connection in the brain could be remade, or the strength of that connection could be adjusted,” Stuart Parkin, a physicist and IBM Fellow, told The New York Times. It’s a little bit easier to visualize. Below, the green represents the ionic fluid and the orange is the surface. (via IBM’s Newest Invention Mimics the Human Brain on an Atomic Level - Adam Clark Estes - The Atlantic Wire)

Bolsa de trabajo de personal técnico de apoyo a la investigación

Bolsa de trabajo de personal técnico de apoyo a la investigación

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 //pagead2.googlesyndication.com/pagead/js/adsbygoogle.js // Se convoca una oferta pública para la constitución de una bolsa de trabajo de personal técnico de apoyo a la investigación de este organismo, con contrato laboral temporal por obra o servicio (Proyecto: Optimization, advanced characterization and testing of a nanofluid based on a eutectic misture of biphenyl and diphenyl oxide as heat…

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Nanowire discovery may lead to better, cheaper solar cells

However, a team from the École polytechnique fédérale de Lausanne (EPFL) in France have found a standardized way to “grow” the wires that’s relatively easy and cheap. “We need nanowires that [resemble] each other like identical twins,” according to grad student Endre Horváth, adding that they need billions identical copies to make effective solar cells. To do it, they used so called nanofluidics, in which fluids are manipulated by microcircuits on a nanometer scale. Using a new technique, they first created “nano-grooves” on a silicon base to guide the tiny streams. That resulted in the parallel formation of tens of thousands of perovskite crystal “wires” (see the two videos, below)

EPFL called the technique “a great leap forward in nanowire technology.” If it can be scaled up, it could lead to perovskite nanowire wafers that are ideal for efficient solar cells. The material would also improve optoelectronic devices like lasers and LEDs.

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Nanowire discovery may lead to better, cheaper solar cells was originally published on Cyber Parse

arxiv.org
[1601.06054] Trapping of Single Nano-Objects in Dynamic Temperature Fields

[ Authors ]
Marco Braun, Alois Würger, Frank Cichos
[ Abstract ]
In this article we explore the dynamics of a Brownian particle in a feedback-free dynamic thermophoretic trap. The trap contains a focused laser beam heating a circular gold structure locally and creating a repulsive thermal potential for a Brownian particle. In order to confine a particle the heating beam is steered along the circumference of the gold structure leading to a non-trivial motion of the particle. We theoretically find a stability condition by switching to a rotating frame, where the laser beam is at rest. Particle trajectories and stable points are calculated as a function of the laser rotations frequency and are experimentally confirmed. Additionally, the effect of Brownian motion is considered. The present study complements the dynamic thermophoretic trapping with a theoretical basis and will enhance the applicability in micro- and nanofluidic devices.