Large sheets of graphene film produced for transparent electrodes w Video

first_img More information: Roll-to-roll production of 30-inch graphene films for transparent electrodes, Sukang Bae et al, Nature Nanotechnology advance online publication. Published online: 20 June 2010. doi:10.1038/nnano.2010.132 High-resolution TEM images showing the folded edges of as-grown graphene films with different number of layers. Image credit: Nature Nanotechnology (doi:10.1038/nnano.2010.132) © 2010 PhysOrg.com Producing graphene layers using crystallization This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. The researchers built up a graphene layer on copper foil and then used rollers to transfer the graphene to a polymer support and then onto a final substrate. Image credit: Nature Nanotechnology. (doi:10.1038/nnano.2010.132) (PhysOrg.com) — Graphene is a relatively new material with outstanding electrical, chemical and mechanical properties that make it an attractive material for use as flexible conductors of the sort used in gadgets such as touch screens and flat panel TVs. In the past attempts to make large films of graphene have been unsuccessful, but now a team of scientists from South Korea and Japan have succeeded in roll-to-roll production of graphene films, growing them by chemical vapor deposition onto flexible copper substrates. Citation: Large sheets of graphene film produced for transparent electrodes (w/ Video) (2010, June 21) retrieved 18 August 2019 from https://phys.org/news/2010-06-large-sheets-graphene-transparent-electrodes.html Graphene is composed of a single layer of carbon atoms in a honeycomb-shaped lattice. It was first isolated in 2004. The material is highly conductive, extremely strong, and is almost transparent, which makes it ideal for high-speed electronic devices.The researchers grew their graphene sheets by chemical vapor deposition onto large sheets of copper foil. They coated the graphene with a thin layer of adhesive polymer and then dissolved away the copper backing. Using rollers, the graphene was then pressed against another substrate, such as PET, and the polymer layer was removed by heating, leaving a film of graphene. They repeated the process to produce a sheet of four layers of graphene on top of each other. This four-layer sheet was then treated with nitric acid to improve its electrical conductivity. Explore further Play Operation movie for graphene-based touch screen panels. Credit: Sukang Bae et al., Nature, doi:10.1038/nnano.2010.132 Electronics companies have been looking for alternatives to ITO for some time because the indium is extremely expensive. Other options looked at have been films of carbon nanotubes, but these have not succeeded because they tend to have small defects that create visible areas of “dead” pixels in displays. Now that graphene has been manufactured in large sheets and demonstrated in real devices, it may only be a couple of years before graphene finds its way into consumer products.Graphene is produced from a small amount of carbon, and unlike ITO production, uses no rare materials. The copper substrate is recyclable, which makes the process more sustainable.The paper is published in the journal Nature Nanotechnology. PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen The rectangular sheets, which measured 76 cm on the diagonal, were of extremely high quality, with the four-layer stack of films exhibiting superior electrical resistance to commercially available transparent electrodes such as indium tin oxides (ITO). The films were almost transparent, allowing 90% of light to pass through.The team, led by researchers Byung Hee Hong and Jong-Hyun Ahn of Sungkyunkwan University (SKKU) in Seoul, also incorporated their graphene electrodes into a fully functional touch-screen panel, where they outperformed standard indium tin oxide electrodes, withstanding double the strain that can be handled by the more fragile ITO. According to Ahn, a graphene-based touchscreen should essentially last forever.last_img read more

Laser shoots down drones at sea w Video

first_imgThe Phalanx Close-in Weapon System. (Credit: Raytheon) Editor of Jane’s Defense Weekly, Peter Felstead, said the laser marks the beginning of a new era in missile defense technology, since lasers are becoming smaller and more effective and can be used to destroy a wide range of threats from the air, from mortars to missiles.Raytheon said the laser system tests are continuing, but the system is unlikely to be ready for deployment until 2016. © 2010 PhysOrg.com This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. The US Navy and coastguard’s standard defense system, the Phalanx Close-In Weapon System, currently overcomes the problem by using a high caliber, radar-guided Gatling gun that is able to counteract the ship’s movements to track and shoot down incoming objects. The Gatling has been used for over 30 years and is capable of firing up to 4,500 rounds of 20-mm ammunition per minute.The Navy’s new system for defeating close-in air and surface missiles or drones is known as LaWS (Laser Weapon System) and is paired with Raytheon’s Phalanx. The system comprises six lasers that focus on the target simultaneously, delivering energy high enough to cause it to catch fire. Range data is provided to the laser system by Phalanx radio-frequency sensors, and Phalanx electro-optical sensors acquire the targets and track them. Explore furthercenter_img The video of the demonstration, taken at an off-shore US Navy test range 120 km west of Los Angeles, was released on July 19th at the biennial International Air Show at Farnborough in the UK. The 32-kilowatt solid-state laser was mounted on a warship gun turret and was shown blasting a remotely piloted unmanned aerial vehicle (UAV) until it caught fire, lost control, and plummeted into the sea. In all, four UAVs were shot down in the seagoing tests.Raytheon’s vice president Mike Booen said the demonstration was a world first with ship-borne lasers shooting down threats from the air at “military significant distances.” Firing a laser at sea is much more difficult than firing from land because it is mounted on a ship, which is moving and rolling with the waves, and it is also in a humid environment heavily laden with salt air. (PhysOrg.com) — An infrared laser developed by Arizona company Raytheon Missile Systems has been demonstrated shooting down incoming drones over the ocean off the coast of California. Citation: Laser shoots down drones at sea (w/ Video) (2010, July 21) retrieved 18 August 2019 from https://phys.org/news/2010-07-laser-drones-sea-video.html USAF Awards Raytheon $752M Contract For Taiwan Early Warning Radarlast_img read more

Museum officials warrant elastic mind in changed era

first_imgWhat the functionaries of museums need today ‘is an elastic mind’ that would boost the ‘educational value’ of such grand institutions, the octogenarian scholar noted in a talk she gave at National Museum in the capital.’Museums should make the invisible visible. Equally, they should make the visible more visible,’ she said in the Eighth NM lecture titled The Museum Experience. Substantiating, Thapar emphasised that curators of museums should be more alert to new developments in the world of history. For instance, labels describing an artifact on display should get their literature updated if latest discoveries have lent them a fresh dimension and relevance, she pointed out. Also Read – ‘Playing Jojo was emotionally exhausting’In this context, the speaker attributed near-absence of such fine-tuning to lack of vision on the part of top officials of heritage institutions. ‘Administrators (wrongly) assume they are specialists in museums and their management,’ remarked Thapar.Delving deeper into the ‘big challenge’ of updating of labels, she said it was high time museums made better use of state-of-the-art technologies that could explain objects on public display. ‘It is not that every gallery should put up lengthy texts. Electronic devices can be employed so that the interested visitor gets access to the finer points that narrate more about items,’ she said, adding that providing copious background material to the discerning was more vital than taking out guided tours. Also Read – Leslie doing new comedy special with NetflixLaxity in taking steps in the country has been leading to the failure in the museums’ prime mission of projecting Indian civilisation, she regretted.Noting that heritage gave a nation its ancestry, Thapar said museum artifacts in a modern era no more catered to pleasing the whims of colonial masters. As 2014 marks two centuries of museum history in India, the country should make best use of passing on its proud legacy to the public at large, pointed out the 82-year-old expert, who has been a visiting professor at Cornell University, the University of Pennsylvania and the College de France in Paris.Thapar spoke at the packed auditorium on how museums in India were initially a colonial imposition and seldom showed signs of growing beyond individual collections. The lecture also delineated on the fine line between art and craft, and noted that museums today have galleries on increasingly new areas of heritage such as textiles and decorative objects.last_img read more

Siliguri Municipal Corporation seizes 400 kg plastic bags

first_imgKolkata: Siliguri Municipal Corporation (SMC) on Sunday seized 400 kg plastic bags from a godown. The godown has been sealed and a massive hunt is on nab to the owners.Acting on a tip off, senior officials of the SMC raided the godown situated in the area under the jurisdiction of ward 8. Senior officials said some unscrupulous traders used to push the bags in the market. Plastic bags have been banned in the areas under SMC.Any person found to be carrying plastic bag is fined. The opposition leaders put pressure on the SMC authorities to unearth the source from where the bags were being supplied to the market. For the past few months, the civic officials waited but could not spot the godown. The bags were kept in huge racks. It was learnt that the bags were meant for the rural areas where they are in great demand. Senior civic officials said the plastic bags are a potential threat to the underground pipeline not only in Siliguri but also throughout the country. Plastic bags clog the underground sewer lines causing massive waterlogging during the monsoons. The civic authorities have over and again requested the customers not to take plastic bags. But they have no other choice because most of the shopkeepers still use plastic bags to wrap various items like fish, meat , vegetables and fruits. The SMC has decided a move to use paper bags in the markets.last_img read more

Body of 26yearold found at rented flat

first_imgKolkata: Mystery shrouds the death of a 26-year-old youth whose body was found inside a residential apartment at Madhyamgram in North 24-Parganas on late Saturday night.The victim, identified as Omprakash Gupta, who was originally from Bihar had rented a flat in Michael Nagar area of Madhyamgram. He used to work at a shopping mall in the same area. Some locals told police that some youths entered his flat situated on the ground floor of the building on Saturday evening. Also Read – Rain batters Kolkata, cripples normal lifeThey also told the investigating officers that people often used to visit his house. After being informed police reached the spot and recovered the victim’s body from inside the toilet. There were several injury marks on various parts of his body. According to the preliminary investigation, police suspect that the victim might have been murdered. They are looking into all possible angles which could have led to his death. They collected samples from the bathroom where the body was found in a pool of blood. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedAccording to police, some portion of the bathroom was found damaged which suggests that a scuffle might have broken out there. A portion of the commode was also found broken. Police are interrogating locals to know the name of the flat owner. They have however started a case of unnatural death. The body has been sent for an autopsy which might throw some light on the nature of his death. The investigating officers sealed the flat after the incident. They are also interrogating some of his colleagues in this connection. The family members of the victim have also been informed.last_img read more

Lightweight outfits bold earrings Be a practical bride

first_imgIndian brides today want to let loose and enjoy their big day. Instead of heavy gold jewellery, it’s best to invest in pieces of single statement earrings and practical lightwieght outfits, suggest experts. Here are few tips for you:Tennis bracelets, statement earrings and distinct cocktail rings are hot this season. Soft fabrics and trendy outfits are high on fashion. For functions like cocktails, sangeet and reception, brides can wear western cut gowns or draped gowns. Also Read – Add new books to your shelfSimple, modern and clean designs are being sought after as they are much lighter than the traditional heavy jewellery. Hues of peach, pink, blue and green is the colour palate to explore in terms of jewellery. Bold statement earrings, featuring some of the new colour stones coupled with rose cuts and set in rose gold is the latest trend. As for bridal outfits, shades of red, aubergine and maroon in fabrics like velvet, silk and satin will be seen making a comeback.Elaborate cuffs on the wrist and a pair of gorgeous earrings can alone do the trick, if matched well, with either a gown or a sari.Experiment with your outfits’ cuts and silhouettes and add some elements of hand work to give an edge in the outfit. Fusion wear is also a hit in bridal fashion now. Try different pairing like heavy dupattas with pants and unconventional blouses.last_img read more

Decorate your home in a minimalistic way

first_imgSimplicity is the special ingredient of decorating a home and size of the house should never matter for converting it into your dream house. With modern décor and eye catching furniture, anyone can make the living space attractive with minimum number of furniture and showcases.Experts share some tips to decorate home in minimalistic way: Keep it simple: White and clean walls, simple textures and blending decor makes minimalist designs spaces- large and inviting. It is more of ‘straight line concept’ rather than ‘classical and ornate’. To balance out the minimalistic approach use crisp and rich natural tones of colours. It will add up the comfort and warmth to your room. Also Read – Add new books to your shelfClear all surfaces of clutter: Cluttered home signifies cluttered mind’, thus leading to increasing stress levels. Keeping home clean is a chore that requires daily diligence. Thus the easiest way is to become minimalistic, where ‘less is more’. Concept of “do I need it’ has taken over from ‘I like it’ and “I must have it’. Even Feng shui advocates minimalistic clutter free décor and living.Choose quality over quantity: Less number of designer décor items can make your home looks attractive and cluster free. You really have to consider each piece carefully for your home. Choose well made pieces that are build to last, will withstand daily use and look better as a result. Try to use old material after showing creativity in it.Balance is the key minimalist design: Balance is very essential to pay attention in the minimalistic design. Arrange pillows, artworks or lamps in flanking pairs or use asymmetrical pattern to look good. This will give you a big difference in how you perceive the space if the placement of items builds off each group through balance or juxtaposition.last_img read more

Twopronged approach to boost power infra in South 24Parganas

first_imgKolkata: West Bengal State Electricity Distribution Company Limited (WBSEDCL) has taken up two-pronged approach to enhance infrastructure creation and also to reduce the loss caused due to tapping in various parts of South 24-Parganas.The WBSEDCL also aims to increase of service connection in the district. A holistic approach has also been adopted for the transformation of the whole region. South 24-Parganas is the biggest district of West Bengal with 9960 sq km area. WBSEDCL is the only licensee, except a small part of Garia, to provide power to 1.63 million customers. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataThe district is having five sub divisions, 32 blocks, five municipalities, 40 police stations, 312 gram panchayat and 1,971 villages. WBSEDCL has 48 33/11 KV sub-stations, 136 power transformers with 936 MVA capacity, 133 33 KV line, 261 11 KV line, 15,072 distribution transformers with total capacity of 962 MVA to cater power to all households of this district. Considering such vast area, providing service connection to all, maintaining uninterrupted quality power service at every corners of the district with safety and Also Read – Lightning kills 8, injures 16 in stateconsumer satisfaction is really a challenge, a senior WBSEDCL from South 24-Parganas said. The WBSEDCL has stressed upon enhancing distribution utility and to ensure connection to all consumers, proper meter reading and billing. If these things are followed properly, the losses will come down automatically. Timely generation of notice and disconnection of default consumers will also add value to it, the official said. Substantial ATC loss reduction has been noticed in South 24-Parganas Region in past 8 months. ATC loss has been reduced from 49.14 percent to 46.24 percent i.e. 2.9 percent. Although in LT part (without bulk), loss has been reduced by 3.72 percent. The official said they had introduced around 1,30,000 connections throughout the district in 8 months. He also pointed out meetings were held to hear the problems directly from station managers and act accordingly. There are some issues, including shortage of contractor manpower. “But, as a whole, it is not at all a problem. I just redistribute manpower and materials, including metres, and other materials from one part to another. Of course, computerised material management helps me a lot to find out where the actual materials are. Help of higher authorities in generation of work order to ensuring availability of meters and materials has also made this huge work a great success,” the official said.last_img read more

Flavoured ecigarettes trigger heart disease risk

first_imgThe flavours used in electronic cigarettes (e-cigarette), especially cinnamon and menthol, can increase the risk of cardiovascular diseases (CVD) when inhaled, says a study. The research team investigated the effect of the e-liquids on endothelial cells that line the interior of blood vessels. The study, published in the Journal of the American College of Cardiology, found that endothelial cells exposed to the e-liquids or to blood collected from e-cigarette users shortly after vaping, exhibit significantly increased levels of molecules implicated in DNA damage and cell death. Also Read – Add new books to your shelfThe severity of the damage, aspects of which occur even in the absence of nicotine, varies among popular flavours, said the researchers, adding that cinnamon and menthol were found to be particularly harmful. “This study clearly shows that e-cigarettes are not a safe alternative to traditional cigarettes,” said Joseph Wu, Professor at Stanford University. For the study, the researchers investigated the effect of six different popular e-liquid flavours – fruit, tobacco, sweet tobacco with caramel and vanilla, sweet butterscotch, cinnamon and menthol – with varied nicotine levels on endothelial cells derived from human induced pluripotent stem cells or iPS cells. Also Read – Over 2 hours screen time daily will make your kids impulsive”When we exposed the cells to six different flavours of e-liquid with varying levels of nicotine, we saw significant damage. The cells were less viable in culture, and they began to exhibit multiple symptoms of dysfunction,” Wu said. The researchers found that while several of the liquids were moderately toxic to the endothelial cells, the cinnamon- and menthol-flavoured e-liquids significantly decreased the viability of the cells in culture even in the absence of nicotine. “It’s important for e-cigarette users to realise that these chemicals are circulating within their bodies and affecting their vascular health,” Wu said.last_img read more

Mamata calls on Governor Dhankar

first_imgKolkata: West Bengal Chief Minister Mamata Banerjee called on Governor Jagdeep Dhankar at his official residence on Friday, Raj Bhavan sources said. The meeting lasted for little over an hour, they said. “It was a courtesy call,” Banerjee told reporters after the meeting, the first between the chief minister and the governor. Dhankar’s wife also joined the two for some time. A former Lok Sabha MP from Jhunjhunu in Rajasthan and a noted Supreme Court advocate, Dhankar took oath as the 28th governor of West Bengal on July 30.last_img read more

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