If you are a frequent flyer, you've probably been at the airport waiting to jet somewhere on a winter trip when the voice of an airline employee announces over the intercom that there will be a slight delay while the plane gets deiced. But how does this process actually work, and why is it needed' As a mechanical engineer who studies frost growth and water droplets on surfaces, I have come to appreciate the importance of deicing planes. Indeed, deicing is an important safety step performed by the airlines on wintry days because of how snow and ice can affect the physics of flying. In short, deicing is necessary because snow and ice on airplane wings can decrease lift by as much as 30%. Lift is the vertical upward force that keeps a plane in the sky. It is generated when air flows over the wings of a plane. Ice and snow can alter how air flows over the wings, which can affect a pilot's ability to maneuver and control the aircraft. It can also increase the stall speed, which is not good either. Stall speed is the minimum speed needed by an aircraft to generate enough lift to keep it aloft....

Back in the old days ' the really old days ' the task of designing materials was laborious. Investigators, over the course of 1,000-plus years, tried to make gold by combining things like lead, mercury, and sulfur, mixed in what they hoped would be just the right proportions. Even famous scientists like Tycho Brahe, Robert Boyle, and Isaac Newton tried their hands at the fruitless endeavor we call alchemy. Materials science has, of course, come a long way. For the past 150 years, researchers have had the benefit of the periodic table of elements to draw upon, which tells them that different elements have different properties, and one can't magically transform into another. Moreover, in the past decade or so, machine learning tools have considerably boosted our capacity to determine the structure and physical properties of various molecules and substances. New research by a group led by Ju Li ' the Tokyo Electric Power Company Professor of Nuclear Engineering at MIT and professor of materials science and engineering ' offers the promise of a major leap in capabilities that can facilitate materials design. The results of their investigation are reported in a December 2024 issue of Nature Computational Science....

As the world looks for ways to stop climate change, much discussion focuses on using hydrogen instead of fossil fuels, which emit climate-warming greenhouse gases (GHGs) when they're burned. The idea is appealing. Burning hydrogen doesn't emit GHGs to the atmosphere, and hydrogen is well-suited for a variety of uses, notably as a replacement for natural gas in industrial processes, power generation, and home heating. But while burning hydrogen won't emit GHGs, any hydrogen that's leaked from pipelines or storage or fueling facilities can indirectly cause climate change by affecting other compounds that are GHGs, including tropospheric ozone and methane, with methane impacts being the dominant effect. A much-cited 2022 modeling study analyzing hydrogen's effects on chemical compounds in the atmosphere concluded that these climate impacts could be considerable. With funding from the MIT Energy Initiative's Future Energy Systems Center, a team of MIT researchers took a more detailed look at the specific chemistry that poses the risks of using hydrogen as a fuel if it leaks....

Troy Van Voorhis, the Robert T. Haslam and Bradley Dewey Professor of Chemistry, will step down as department head of the Department of Chemistry at the end of this academic year. Van Voorhis has served as department head since 2019, previously serving the department as associate department head since 2015. 'Troy has been an invaluable partner and sounding board who could always be counted on for a wonderful mix of wisdom and pragmatism,' says Nergis Mavalvala, the Kathleen and Curtis Marble professor of astrophysics and dean of the MIT School of Science. 'While department head, Troy provided calm guidance during the Covid pandemic, encouraging and financially supporting additional programs to improve his community's quality of life.' 'I have had the pleasure of serving as head of our department for the past five-plus years. It has been a period of significant upheaval in our world,' says Van Voorhis. 'Throughout it all, one of my consistent joys has been the privilege of working within the chemistry department and across the wider MIT community on research, education, and community building.'...