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S. “They have to leapfrog to MATS because they don’t have the refrigerated supply chain like we have in the U.” Minister of State for Housing and Urban Development Nasir Aslam Wani said. Sonam Kapoor is such a stunner on the red carpet!healthy? 2012 3:19 pm Related News In a recent study, 2010 4:12 pm Related News Actor Johnny Depp has revealed that Disney bosses were initially uncomfortable with his portrayal of Captain Jack Sparrow in ?By: IANS | New Delhi | Updated: October 8C. thinks it has discovered a method that could possibly pay for itself by making something potentially useful out of the CO2 pulled from the air Today in Nano Letters the group presents a process that turns atmospheric CO2 into carbon nanofibers similar to valuable materials used in industries such as aerospace construction and electronics “It’s clearly interesting and exciting research but it’s a first step” cautions James Tour a nanoengineering and materials scientist at Rice University in Houston Texas who is not part of the study “There’s still a lot of work to be done” The conversion process called STEP (for Solar Thermal Electrochemical Process) is powered by sunlight heat and a small electrical kick The researchers simply run a current between two electrodes in a crucible filled with molten lithium carbonate which melts at 723°C and a few types of metal To start the process the molten lithium carbonate absorbs CO2 from the air The electrical current then busts apart the CO2 molecules through a process called electrolysis and the carbon atoms swarm to the negatively charged electrode Ordinarily the carbon just forms useless gunge—which makes this form of carbon capture a sure loser But the researchers found that if they seasoned the lithium carbonate with just the right metals they could form more valuable carbon nanotubes instead First zinc sparks the process of nanofiber formation Then one of four other metals (nickel cobalt copper or iron) acts as a scaffold known as a nucleation site on which the nanofiber continues to grow The team found that with the right combination of metals voltage and temperature STEP’s coulombic efficiency (a classic measure of chemical yield used to determine how efficiently the product is made) hovered around 95% meaning that in STEP’s case 95% of the current worked toward producing the carbon nanofibers and only 5% powered other side reactions “It’s very exciting and I think it’s a viable option in providing a scientific and technological solution to decreasing the CO2 in the atmosphere” Licht says In particular he and his team hope STEP could provide a less expensive way to make carbon nanofibers The materials—noncylindrical cousins of carbon nanotubes composed of chains of carbon atoms less than a micrometer wide—are used in making composite materials chemical catalysts and even scanning probe microscopes But they are frustratingly costly to manufacture Cutting the price through STEP would be a real “game-changer” Licht says: Cheaper nanofibers would lead to greater commercial use and in turn to less carbon in the atmosphere Licht says that using STEP in an area less than 10% the size of the Sahara desert could bring CO2 in the atmosphere down to preindustrial levels in just 10 years (Side note: 10% of the Sahara desert is more than twice the area of California—that’s a lot of molten lithium) First though STEP would require some serious upscaling One major hurdle Tour says is that STEP can’t yet produce usable nanofibers “It’s like when you shear a sheep and you get wool” he says “Those little wool fibers that first come off its back—you can’t make a blanket out of that You have to somehow get it spun into long fibers that you can then put into a machine to get a wool sweater or blanket” Until scientists learn to spin STEP’s carbon nanofibers into long commercially usable fibers he says it’s too early to hail the process as an environmental breakthrough But Andrew Bocarsly a physical inorganic chemist at Princeton University who is not part of the study says the team’s results are encouraging despite such open questions “Even if Licht’s work only uses up 01% or even 001% of the CO2 that we’re generating it would be a great start” Bocarsly says “It’s not the solution but it might be part of the solution” Now.