Electronics
Sound-Powered Medical Implants
Posted in Power Supplies, Electronics, Implants & Prosthetics, Medical, Patient Monitoring, News, MDB on Wednesday, 29 October 2014
Engineers at Stanford University are working on a new generation of medical devices that would be planted deep inside the body to monitor illness, deliver therapies and relieve pain. But in order to do so, they need to develop a way to provide electric power to those implants. Using wires or batteries to deliver power generally makes implants too big, too clumsy, or both, they say.
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Ferroelectric Materials Could Revolutionize Data-Driven Devices
Posted in Electronics & Computers, Electronic Components, Board-Level Electronics, Electronics, Power Management, Computers, Materials, Metals, Test & Measurement, Measuring Instruments, News on Friday, 17 October 2014
Electronic devices with unprecedented efficiency and data storage may someday run on ferroelectrics — remarkable materials that use built-in electric polarizations to read and write digital information, outperforming the magnets that are inside most popular data-driven technology. But ferroelectrics must first overcome a few key stumbling blocks, including a curious habit of "forgetting" stored data. Now, however, scientists at the U.S. Department of Energy's Brookhaven National Laboratory have discovered nanoscale asymmetries and charge preferences hidden within ferroelectrics that may explain their operational limits.
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Exploring Batteries for Micromachinery
Posted in Batteries, Electronic Components, Electronics, Medical, News, MDB on Friday, 03 October 2014
A team of researchers from the National Institute of Standards and Technology, Gaithersburg, MD, along with other institutions, has developed a toolset to allow them to explore the interior of microscopic, multi-layered batteries. This allows them insight into the batteries’ performance without destroying them—resulting in both a useful probe for scientists and a potential power source for micromachines.
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Building Optical Chips that Can Be Tuned to Different Frequencies
Posted in Electronics, Medical, News, MDB on Thursday, 25 September 2014
Chips that could use light, instead of electricity, to move data would consume much less power—a growing concern as chips’ transistor counts rise. Of the three chief components of optical circuits—light emitters, modulators, and detectors—emitters are the toughest to build. One promising light source for optical chips is molybdenum disulfide (MoS2), which has excellent optical properties when deposited as a single, atom-thick layer, say researchers at Massachusetts Institute of Technology, Cambridge. Other experimental on-chip light emitters have more-complex three-dimensional geometries and use materials that are much more scarce, which would make them more difficult and costly to manufacture.
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Can New Material Succeed Silicon for Electronic Uses?
Posted in Electronics, Semiconductors & ICs, News, MDB on Tuesday, 23 September 2014
Silicon is generally the material of choice in the electronics industry. Yet transistors, the switchable valves that control the flow of electrons in a circuit, cannot simply keep shrinking to meet the needs of powerful, compact devices. Physical limitations like energy consumption and heat dissipation are too significant. Now, using a quantum material called a correlated oxide, a team of researchers at Harvard University, Cambridge, MA, have achieved a reversible change in electrical resistance of eight orders of magnitude, a result the researchers are calling “colossal.” In short, they have engineered this material to perform comparably with the best silicon switches.
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Researchers Control Surface Tension of Liquid Metals
Posted in Electronics & Computers, Electronics, Power Management, Materials, Metals, RF & Microwave Electronics, Antennas, News on Friday, 19 September 2014
Researchers from North Carolina State University have developed a technique for controlling the surface tension of liquid metals by applying very low voltages, opening the door to a new generation of reconfigurable electronic circuits, antennas and other technologies. The technique hinges on the fact that the oxide “skin” of the metal – which can be deposited or removed – acts as a surfactant, lowering the surface tension between the metal and the surrounding fluid.

The researchers used a liquid metal alloy of gallium and indium. In base, the bare alloy has a remarkably high surface tension of about 500 millinewtons (mN)/meter, which causes the metal to bead up into a spherical blob. “But we discovered that applying a small, positive charge – less than 1 volt – causes an electrochemical reaction that creates an oxide layer on the surface of the metal, dramatically lowering the surface tension from 500 mN/meter to around 2 mN/meter,” says Dr. Michael Dickey, an associate professor of chemical and biomolecular engineering at NC State and senior author of a paper describing the work. “This change allows the liquid metal to spread out like a pancake, due to gravity.”

The researchers also showed that the change in surface tension is reversible. If researchers flip the polarity of the charge from positive to negative, the oxide is eliminated and high surface tension is restored.  The surface tension can be tuned between these two extremes by varying the voltage in small steps.

Source

Also: Learn about Gradient Metal Alloys Fabricated Using Additive Manufacturing.
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Connecting the World with Tiny Radios
Posted in Electronic Components, Board-Level Electronics, Power Supplies, Electronics, Power Management, Medical, Patient Monitoring, Diagnostics, News, MDB on Wednesday, 17 September 2014
A Stanford University engineering team has built a radio the size of an ant that requires no batteries. The device gathers all the power it needs from the same electromagnetic waves that carry signals to its receiving antenna. Designed to compute, execute, and relay commands, the tiny wireless chip costs pennies to manufacture, making it cheap enough, they say, to become the missing link between the Internet and the connected smart gadgets envisioned in the “Internet of Things.”
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