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26 Current news of University of Pennsylvania
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How Is Haze Formed?
Soot as a surprising source of haze-building hydroxyl radicals: new perspectives for air purification and the energy industry
05-Apr-2022
Haze is formed when a cocktail of various gaseous pollutants is oxidized and forms particulate matter diffusing sunlight. This process is mainly mediated by hydroxyl radicals (OH), and researchers have now discovered a new route to their formation. This newly discovered radical-building mechanism ...
Ultrathin and ultralight 'nanocardboard'
08-Nov-2018
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure Now, a team of Penn Engineers has ...
Engineers give optical switches the 'contrast' of electronic transistors
02-Feb-2018
Current computer systems represent bits of information, the 1's and 0's of binary code, with electricity. Circuit elements, such as transistors, operate on these electric signals, producing outputs that are dependent on their inputs. As fast and powerful as computers have become, Ritesh Agarwal, ...
How to control liquid crystal patterns
03-Nov-2017
When Lisa Tran set out to investigate patterns in liquid crystals, she didn't know what to expect. When she first looked through the microscope, she saw dancing iridescent spheres with fingerprint-like patterns etched into them that spiraled and flattened as the solution they were floated in ...
Smart materials used in ultrasound behave similar to water, Penn chemists report
19-Jun-2017
A team of researchers at the University of Pennsylvania is gaining new insight into the smart materials used in ultrasound technology. While forming the most thorough model to date of how these materials work, they have found striking similarities with the behavior of water. The research was led ...
Penn researchers push the limits of organic synthesis
09-Mar-2017
A dendritic molecule is one that grows by branching in several directions from its center core. At each branching point, the molecule branches again into a new generation. These molecules can be used for a broad range of biomedical applications, including gene and drug delivery. In 1983, Nobel ...
Overcoming a hurdle in growing a revolutionary optical metamaterial
23-Feb-2017
When John Crocker, a professor of chemical and biomolecular engineering in the University of Pennsylvania's School of Engineering and Applied Science was a graduate student, his advisor gathered together everyone in his lab to "throw down the gauntlet" on a new challenge in the field. Someone had ...
Chemists establish fundamentals of ferroelectric materials
07-Jul-2016
Ferromagnetic materials, like compass needles, are useful because their magnetic polarization makes them rotate to align with magnetic fields. Ferroelectric materials behave in a similar way but with electric, rather than magnetic, fields. That external electric fields can reorient the electric ...
Researchers move one step closer to sustainable hydrogen production
05-Apr-2016
Splitting water into its hydrogen and oxygen parts may sound like science fiction, but it's the end goal of chemists and chemical engineers like Christopher Murray of the University of Pennsylvania and Matteo Cargnello of Stanford University. They work in a field called photocatalysis, which, at ...
Penn engineers show how 'perfect' materials begin to fail
10-Jun-2015
Crystalline materials have atoms that are neatly lined up in a repeating pattern. When they break, that failure tends to start at a defect, or a place where the pattern is disrupted. But how do defect-free materials break?Until recently, the question was purely theoretical; making a defect-free ...
