A potentially game-changing breakthrough in artificial photosynthesis has been achieved with the development of a system that can
The post Major Advance in Artificial Photosynthesis Poses Win/Win for the Environment has been published on Technology Org.
The universe is incredibly big. But how do astronomers know that? Billion-mile-long tape measures can't be found at the hardware store. Instead, astronomers use the expansion of the universe itself to establish milepost markers. The light from remote objects is attenuated and weakened as space stretches like a rubber band. The consequences are that starlight will look redder relative to a nearby star of the same temperature. When starlight is spread into its component color via spectroscopy, features in the light will be shifted to the red end of the spectrum. This "redshift" can be used to reliably calibrate distances. The challenge is the farthest objects in the universe are typically too faint for spectroscopy to work. So instead, astronomers deduce a galaxy's distance by precisely measuring its colors in visible and infrared light. This technique has found candidates for the farthest object in the universe.
Some sculptors work in marble, others in wood… but Harvard University biomineralization researcher Wim Noorduin creates his masterpieces inside a beaker. You'd be hard-pressed to put his flowery sculptures on a regular museum pedestal, though. They're actually microscopic crystal structures many times smaller than the width of a human hair.
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Minerals can naturally assemble into impressive shapes, even at very tiny scales, and Noorduin's scientific research is part of an effort to understand how chemistry can drive this process. His sculptures start with a solution of the salt barium chloride and the compound sodium silicate, also known as waterglass. When these ingredients are added, carbon dioxide from the air that's dissolved in the beaker's water kicks off a reaction that forms barium carbonate crystals — and also lowers the pH of the solution near the newly formed crystals. This pH change then sparks a reaction with the sodium silicate, which deposits silica on the growing crystals.
"We know how fast these structures grow and what is going to happen if we change, say, the temperature or acidity," Noorduin said in a phone interview. And knowing those principles "allows you to collaborate with the self-assembly process that's going on, and you can really manipulate the sculptures in a rational way."
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Left to its own devices, the solution will form an intriguing forest of shapes. But human intervention can sculpt them into even more ethereal forms. There are lots of ways that Noorduin can manipulate the microenvironment inside the solution: The temperature can be altered with an ice bath, for example, or he can control the addition of carbon dioxide in the solution by capping the beaker. "If we take off the cap for just a few minutes and put it back on, in that time more CO2 will come into the solution from the air," Noorduin says. "As a result, the chemical reaction completely changes — it allows me to split structures open or make well-controlled ripples.
Noorduin can manipulate the sculptures even further, joining separate pieces into more complex shapes. He can grow a "vase" shape in one solution, then start the growth of a new "stem" shape from that and manipulate the whole into a flower. Noorduin thinks the mechanics underlying his microscopic bouquets could one day help researchers create tiny tools and devices, or manipulate everyday materials to make them stronger.
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"I'm amazed by how very simple processes can give rise to complex shapes and structures," Noorduin says. While the driving force behind his work is scientific inquiry, he isn't immune to the eerily beautiful aesthetics of his work. "I am interested in trying to make the most beautiful landscapes. I got addicted to wandering around in this world."
The scene in their meeting room was mostly pretty standard—tables, chairs, coffee, and snacks—but not many field stations have a shiny new nine-panel computer display on the wall. And no field stations have what that display will soon be showing.
Nestled along the eastern edge of New York’s stout and beautiful Adirondack Mountains, south of sprawling Lake Champlain, Lake George is a long, glacially sculpted basin filled by clear waters. The lake is 51 kilometers long, doesn’t get much more than three kilometers wide, and has long been a natural attraction. Thomas Jefferson once called it “the most beautiful water I ever saw." But today, a partnership between IBM, the Rensselaer Polytechnic Institute, and the local FUND for Lake George has a different descriptor in mind—“smartest” lake in the world. It's an effort dubbed the “Jefferson Project.”
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On Monday, teams working on the Large Hadron Collider resolved a problem that had been delaying the restart
The post LHC restart back on track has been published on Technology Org.
