The fast growing plant switchgrass has been heralded as the next generation of biofuel stock: Unlike fertilizer-dependent corn, researchers say it’s highly efficient to grow the grass and process it into ethanol. But a new study suggests that there’s an even better use for switchgrass and other plants. Rather than turning them into ethanol to fill the gas tanks of cars, plants should be burned in power plants to generate “bioelectricity,” which can power electric cars.
Using a sophisticated computer analysis, researchers found that a small sport utility vehicle could do 9,000 highway miles (14,484 km) on the energy produced from an acre of switchgrass converted into ethanol. But converting that biomass into electricity allowed a battery-powered SUV to get 14,000 miles (22,531 km) on the highway…. “One of the driving factors that lead to this result is that the electric motor is much more efficient than the internal combustion engine,” said the lead author of the study, Elliott Campbell [Reuters].
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General Motors and Segway have unveiled the prototype of their new collaborative effort: a tiny electric vehicle that the companies say could, maybe, one day, revolutionize urban transportation. The two-seated, two-wheeled pod is called PUMA, which stands for Personal Urban Mobility and Accessibility. G.M. executive Larry Burns says the PUMA is part of the company’s effort to remake itself as a purveyor of fuel-efficient vehicles. If Hummer took GM to the large-vehicle extreme, Burns said, the PUMA takes GM to the other [AP].
The companies will show off the PUMA at the New York International Auto Show this week, but say there’s a lot of work to be done before it will show up on city streets. “This is a prototype, not a product,” said [James] Norrod of Segway. “We have not made a decision to commercialize it” [The New York Times blog]. But if all goes well, the PUMA could eventually be sold for between one-fourth and one-third the price of a traditional car, G.M. executives say.
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The latest advance in battery technology comes from viruses working on the nanoscale. Researchers have constructed a lithium-ion battery, similar to those used in millions of devices, but one which uses genetically engineered viruses to create the negatively charged anode and positively charged cathode [BBC News]. The tiny workers are bacteriophages, viruses that infect bacteria but are harmless to humans.
Three years ago, the same researchers created viruses that collected negatively charged particles of cobalt oxide and gold, which “grew” on a film to create the anode. Now, the researchers have added to that achievement, tackling the trickier task of making cathodes. The work was more difficult because the material had to be highly conductive in order to be effective and most candidate materials for cathodes are highly insulating [BBC News]. The researchers engineered viruses that coat themselves with iron phosphate. Then they then latch onto carbon nanotubes to create a network of highly conductive material [ComputerWorld]. Iron phosphate is generally not a good conductor, but its properties change when it’s organized on the nanoscale.
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The Silicon Valley startup that’s seeking to revolutionize the automobile industry has unveiled the prototype for its all-electric sedan, which the company, Tesla Motors, describes as the first mass market all-electric car. But the cars won’t be rolling off the assembly line any time soon–because the company hasn’t built the assembly lines yet. Tesla couldn’t build a factory for the sedan, called the Model S, until it rounded up more money, which became more difficult over the last year as the economic climate worsened.
Elon Musk, Tesla’s founder, says he hopes the first cars will be delivered to customers in 2011. The company plans to produce 20,000 cars a year. However, Tesla has yet to secure finance for the project. It says it is confident of negotiating a $350 million US government loan from the $25 billion bailout package approved by the Department of Energy last year. The government fund is intended primarily to help struggling carmakers to make more fuel-efficient cars [Times Online].
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Looking like a cross between a Volkswagon Beetle and a small Cessna airplane, the closest thing yet to a flying car took to the skies earlier this month. The startup company Terrafugia just announced that its “roadable aircraft” performed a successful maiden flight. The vehicle is officially considered a light sport aircraft, but on the ground its wings fold up in 30 seconds allowing for a seamless transition from sky to land. Hence the vehicle’s name: Transition.
The maiden flight was short — just 37 seconds — and right over the runway, but as Anna Mracek Dietrich, a Terrafugia co-founder and its chief operating officer, pointed out, flying wasn’t the key goal. “The first flight is great, but first landing is what matters,” she [said]. That apparently went well too, according to Phil Mateer, a retired Air Force test pilot who took the wheel for Transition’s debut flight…. “The flight was remarkably unremarkable,” Mateer said [Discovery News].
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Fixing a scratch on your car could soon be as easy as parking it in a sunny driveway for an hour. Researchers have invented a self-healing coating that mends scratches when exposed to ultraviolet light, and say the material could keep everything from cars to iPods looking shiny and new.
The research team made the new coating by mixing chitosan—a derivative of chitin, the main component of arthropod exoskeletons—into polyurethane. They made tiny nicks in the new material, then exposed it to UV light about as intense as that given off by the sun. The radiation set off a series of reactions, causing damaged molecules to link up with each other again. The cuts healed in about 30 minutes [Wired].
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Researchers may have found a way to drastically increase the performance of the lithium ion batteries that power everything from electric cars to laptops. By reconfiguring the battery to allow lithium ions to rush in and out about 100 times faster than before, researchers say they’ve created a prototype that provides fast bursts of power and also, crucially, recharges in seconds. A prototype of a battery made with the new technique could be charged in less than 20 seconds compared to the six minutes it took to charge cells made in the standard way [Australian Broadcasting Corporation].
Lithium ion batteries are capable of storing a great deal of energy, and have therefore been selected for use in electric cars like the Tesla Roadster (which uses 6,831 individual cells) and the Chevy Volt. But getting the lithium ions in and out is a drawn-out affair. This phenomenon explains why some electric vehicles (the rip-roaring $109,000 Tesla Roadster with its massive battery pack excluded) can reach high speeds, but they suffer from poor acceleration compared with the propulsive force unleashed by the rapid succession of mini explosions in an internal combustion engine. The slow exchange of ions also means lithium ion batteries recharge slowly—just think of how long you have to charge your tiny cell phone [Scientific American].
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The governors of Washington, Oregon, and California are considering plans for a “green freeway” that would see alternative fueling stations implemented along Interstate 5 from Canada to Mexico. As the plan stands, motorists eventually would be able to pull off at I-5 rest stops for more than a cup of coffee and roadside relief: They also would be able to charge, or swap out, their electric-vehicle batteries or fill their tanks with biodiesel, ethanol, hydrogen or compressed natural gas [The Seattle Times].
Opponents to the plan say it would compete with private businesses, but Jeff Doyle from Washington’s Department of Transportation said the state wouldn’t want alternative-fuel stations to disrupt rest-area traffic, so contract companies would have to provide small, low-profile setups. Doyle added that rest-stop fueling sites would be self-service and likely to have little or no on-site staffing [The Seattle Times]. While the plan is facing many rounds of approval before it can become a reality, it does fit into the new administration’s push for green jobs and it would most likely qualify for stimulus money that would get the project going [EcoGeek].
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The joke about hydrogen-powered cars is that they’re about 10 years away–and always will be. The technology has been held up largely by the high cost of hydrogen fuel cells, but now researchers say they’ve found a way to bring down the cost dramatically by making a key component out of carbon nanotubes instead of platinum. More than half the cost of fuel-cell stacks comes from platinum, according to the Department of Energy. “Fuel cells haven’t been commercialized for larger-scale applications because platinum is too expensive,” says Liming Dai [Technology Review], the lead author of the new study.
Researcher found that tightly packed, vertically aligned carbon nanotubes doped with nitrogen were more effective as catalysts than platinum, which is usually used to help oxygen react within the fuel cell. That is a vital stage of the fuel cell cycle. Rather than burning fuel to create heat to power a turbine, fuel cells turn chemical energy directly into a flow of electricity. Hydrogen gas, for example, is pumped past one electrode (the anode), where it is split into its constituent electrons and protons. The electrons then flow out of the anode, providing electrical power, while the protons diffuse through the cell. Electrons and protons both end up at a second electrode (the cathode), where they combine with oxygen to form water [New Scientist].
That second reaction is very slow, so engineers have developed cathodes made out of materials that act as chemical catalysts and speed up the reaction. Until now, platinum was considered the best catalyst, but now carbon nanotubes with a trace of nitrogen (the critical ingredient) have left the precious metal in the dust.
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To kick off the second week of his administration and signal his commitment to environmental and energy issues, President Barack Obama today asked the Environmental Protection Agency to consider allowing states to set their own strict standards for auto emissions. He also ordered the Department of Transportation to develop national standards for fuel efficiency. The moves are aimed at reversing decisions by [the] Bush administration, which he said had stood in the way of bold action by California and other states to limit greenhouse gas emissions from automobiles. “The days of Washington dragging its heels are over,” Obama said [Washington Post].
In 2007, the EPA administrator denied requests from California and 13 other states for waivers allowing them to set stricter standards for vehicles’ carbon dioxide emissions, despite the fact that the agency’s own staff scientists recommended granting the waivers. During a signing ceremony in the East Room at the White House, Obama made it clear that he sees a pressing need to address the United States’ dependence on foreign oil and the planet-wide threat of global warming caused by greenhouse gas emissions. “Year after year, decade after decade, we’ve chosen delay over decisive action. Rigid ideology has overruled sound science. Special interests have overshadowed common sense” [ABC News], he said.
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It may be a platitude that fresh, clean air is good for you, but now researchers have quantified how much cleaning up air pollution has improved the public health: It has boosted the lifespan of the average American city-dweller by five months.
Coauthor Majid Ezzatin explains that when his team examined three decades of health data from 51 U.S. cities, researchers found that people are living about three years longer than they did before. Controlling for changes in income, education, demographics and smoking, about five months of that can be chalked up to air improvements…. “Rather than just saying pollution is bad for health,” he said, “we can say that regulations are good for health” [Wired News].
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The U.S. auto industry may be floundering in part because it failed to embrace fuel-efficient and alternative fuel cars, but U.S. companies can still position themselves to lead the way in the next phase of automobile manufacturing, a group of battery makers is arguing. Fourteen companies have announced that they’re teaming up and will seek $1 billion in federal aid to build a large-scale factory that produces lithium-ion batteries, which would be used in plug-in electric cars. Many experts believe battery technology and manufacturing capacity could become as strategically important as oil is today. Auto makers, including General Motors Corp. and Ford Motor Co., say they plan to roll out plug-in electric cars by 2010 [The Wall Street Journal].
The consortium, which calls itself the National Alliance for Advanced Transportation Battery Cell Manufacture, is modeled after a group formed in 1987 by computer-chip manufacturing companies that were struggling to compete with Japanese chip makers. The situation is similar now, experts say, as Asian companies dominate the battery market. “A small, fragmented (U.S.) battery industry will not long survive in the face of determined Asian competition,” Ralph Brodd, a consultant to battery manufacturers, said…. “(Other) countries understand that he who makes the batteries will one day make the cars,” he said [Reuters].
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Honda’s robotics division has unveiled the prototype of a strange new helper: a “walking assistant.” Honda says the robotic legs could restore mobility to the elderly or infirm, and could help prevent factory workers from straining their muscles–if they don’t mind being joined to the strange looking device. The user would employ the device by stepping into a pair of shoes attached to jointed legs. The legs support a mildly-scary looking U-shaped saddle, which cups the wearer’s groin and buttocks firmly to deliver solid uplift…. Honda say that the machine reduces load on the hip joints, and helps not just with walking but also standing – and especially with maintaining a crouched position [The Register].
The device, which weighs about 14 pounds and is powered by a motor and Lithium ion battery, is the result of Honda’s nine-year-old initiative to develop mobility-assisting technologies. The creation of the device borrowed heavily from the walking research that went into Honda’s advanced humanoid robot, ASIMO [Daily Tech]. Honda hasn’t yet announced plans to begin selling the walking assistants, but tests of the prototype will begin this month.
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Earlier this month, the much-hyped electric car company Tesla Motors admitted that the hard financial times were taking a toll, and scaled back its goals to mass-produce flashy electric sports cars and sedans in the next few years. In that announcement, company founder (and space entrepreneur) Elon Musk revealed that the company would cut staff, close a Detroit office, and postpone production of its next generation vehicle, the Model S. Now the company has acknowledged that it was forced to cut almost 25 percent of its workforce, and analysts are wondering about its future.
The company is reportedly reeling because a number of investors withdrew their support or demanded tougher terms as financial markets collapsed over the past month. The company restructuring means that the Model S, a four-door sedan, won’t be ready until 2011, and the startup could lose its first-mover advantage: By 2010, everyone from General Motors to Toyota Motor, Nissan Motor, and Daimler expects to launch their own electrified vehicles. James N. Hall, who runs the auto consulting firm 2953 Analytics, sees trouble ahead. “If the market wants [electric cars] in the number Tesla is talking about,” he says, “a larger auto company will bury them on cost” [BusinessWeek].
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Engineers have unveiled designs for a rocket- and jet-powered car that they say could bust the land-speed record wide open, potentially traveling faster than 1,000 miles per hour. The vehicle, called the Bloodhound SSC, is being designed by the same team that built the first car to ever break the sound barrier, the Thrust SSC, which clocked in at 763 mph when it zoomed across Nevada’s Black Rock desert in 1997. That vehicle currently holds the land-speed record.
The 42-foot long Bloodhound will be powered by an “exotic combination” of jet, rocket, and piston-engine power…. From what we understand, the rocket’s charged mainly with propelling the car to high speeds. Though it’s good for that, it’s unable to hold selected speeds, hence the addition of a Eurojet EJ200 jet engine kicks in. The piston engine? We hear the 800-hp V-12 engine serves mostly as an auxiliary power source and a fuel pump [Automobile].
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