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Showing posts from December, 2013

Nanogenerators

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Rechargeable batteries Consumer electronic devices such as laptop computers and cell phones, portable systems, health monitoring, infrastructure, environmental monitoring, defense technologies and many other micro and nano systems require small power in the range of micro to milli Watts. For operating these portable electronics devices the current technology mainly relies on rechargeable batteries. But the traditional batteries have their inherent drawbacks and may not meet or be the only choice as power sources and hence the reason for new ultra light weight, high power battery developments. Nanogenerator A new idea is to have self powered nanotechnology, aiming at powering these devices using the energy harvested from the environment in which the systems are supposed to operate. The answer is nanogenerator. Nanogenerator is a technology that converts mechanical or thermal energy produced on small-scale into electricity. Nanogenerator can be broadly three types: piezoelectric, triboel

Nanocoating for thermal barrier

M/s Nanotech, Inc. has developed a water-based nanotechnology coating product called Nansulate that can literally be applied to any surface to reduce heat transfer. In buildings it can be applied on external walls to keep it cool. It acts as thermal insulation and can also prevent corrosion, offer flame resistance, cut down on mold growth and encapsulate lead and other harmful substances often found in buildings, preventing them from leaching into the ground. On metallic surfaces it can be used to reduce heat conduction and so on.  http://www.nansulate.com/ Watch the video

BEST INTERNET SPEED TESTS WEBSITE

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ISP-Independent Speed Tests Speedof.me Speedof.me is an HTML5-based speed test that’s lightweight and designed to replicate real-world browsing and downloading conditions by requesting a series of files in increasing size and recording the speed at which they’re downloaded. speedtest.net Ookla’s bandwidth diagnostic software shows up on a number of the other speed test sites listed here, but the most full-featured iteration of the test is on Speedtest.net, which is owned by Ookla. MySpeed Visualware VisualWare’s Myspeed internet test isn’t the definition of user-friendly, but it is a powerful, fast, and detailed tool for more than just measuring how fast you can download that new video game or stream a movie. Ping Test ISP-Hosted Speed Tests SpeakEasy SpeedTest One of the better sites to use Ookla’s software, SpeakEasy SpeedTest allows you to choose from eight different locations to measure upload and download speeds. 

CNT arrays can make novel transisor

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Electronic circuits use silicon for the components but has a limitation in its further reduction of size. Also silicon supply is expected to reduce in few years. Hence researchers are working on replacing silicon in electronic circuits by carbon nanotubes. Carbon nanotubes Carbon nanotubes are sheets of graphite rolled up to few nanometres in diameter. Because of their high-performance they are three times faster and consume only one-third the power than silicon devices. Single-walled carbon nanotubes can replace silicon in making thin-film transistors and high-performance logic devices due to their exceptional electronic and mechanical properties. Dense aligned arrays of carbon nanotubes can be made through techniques like chemical vapour deposition on crystalline substrates, however, they cannot compete with silicon-based devices for high-performance applications because of old fabrication techniques adopted. A recent report indicates that a team at IBM TJ Watson Research Centre in N

Effect of carbon nanotube wastes on soil

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Carbon nanotubes Various forms of nanotubes are added to a variety of products during their manufacture and biomedical applications to increase the strength of the materials without adding much weight. Nanotube manufacturing waste products and bio-solids that result from such applications as in water purification may find their way into wastewater treatment plants. These bio-solids cannot be released into water bodies and so they are often discarded by spreading on land. Similarly both carbon nanotubes and functionalized carbon nanotubes (with modifications to create chemical or biological changes to the nanotubes) are often used in medicines. Majority of the wastes emanating from these sources may also be disposed into soil. Data on the effects of the release of these nano materials on environment, particularly in high or low organic soils remains sparse. Effect on soil Results indicate that repeated applications of as-produced SWNTs can affect microbial community structures and induc

Graphene in loudspeakers and earphones

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Loudspeakers and earphones are used with portable devices such as smart phones, laptops, notebooks and tablets. Inside a speaker a flexible material such as paper or plastic forming a thin diaphragm vibrates and amplifies these vibrations, pumping sound waves into the surrounding air and towards the ears producing different sounds depending on their frequency. Sound device The quality of a loudspeaker depends on how flat its frequency response is – that is, on the ability of the design to deliver a constant sound pressure level from 20 Hz to 20 kHz in the audible range. Presently they employ conventional type of speakers which have limitations in their operation in respect of size, frequency response and power consumption. Graphene loudspeaker Researchers at the University of California at Berkeley have made a graphene loudspeaker that, while of no specific design, is already as good as, or even better than, certain commercial speakers and earphones. graphene loudspeaker have ultralow

Nano gold cluster is a marvellous catalyst

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Nanosized gold clusters Nanosized gold clusters is known to catalyze various oxidations, esterifications, and epoxidations. But the basis of the precious metal’s reactivity was not very clear to the scientists. However carbon monoxide oxidation catalyst by gold is well known. In the case of CO oxidation a computational study has found that CO can surprisingly provide a cocatalytic assist to gold nanoclusters during oxidation reactions. The presence of neighboring CO molecules on gold nanoclusters enhances dioxygen oxidation of CO to carbon dioxide. Mechanism This self-oxidation mechanism has now been uncovered by researchers of University of Nebraska and  Xiangtan University of in China. The findings reveals that when CO is bound to certain triangular Au3 active sites on gold nanoclusters in the presence of O2, the CO molecule helps facilitate bond scission in an adjacent OCOO intermediate. The analysis shows that an attack on the intermediate by the Au3-bound CO neighbor would signifi