Visiting Professor Talks Materials Nanotechnology

By ARL Public Affairs

A visiting professor discussed material nanotechnology and how defects can rule the properties of a crystal in a July 29 seminar for U.S. Army Research Laboratory scientists.

Dr. YuHuang Wang, associate professor of chemistry at the University of Maryland, told Army scientists and researchers at the Rodman Materials Research Laboratory how on the nanoscale, electrons, excitons, phonons and spin may strongly couple at defect sites.

A visiting professor discusses material nanotechnology and how defects can rule the properties of a crystal in a July 29 seminar for U.S. Army Research Laboratory scientists. (Photo Credit: David McNally)

A visiting professor discusses material nanotechnology and how defects can rule the properties of a crystal in a July 29 seminar for U.S. Army Research Laboratory scientists. (Photo Credit: David McNally)

“It is possible to block oxidation of carbon nanomaterials by protecting only those defect sites,” Wang said. “The ongoing collaboration with ARL allows us to demonstrate high-power thin-film thermoacoustics.”

Wang’s group at UMD and an ARL group led by Dr. Bryan Glaz in the Vehicles Technology Directorate have been engaged in developing a carbon-nanotube based thermoacoustic approach to directly interact with small scale features in turbulent flows.

Dr. YuHuang Wang, associate professor of chemistry at the University of Maryland, tells Army scientists and researchers at the Rodman Materials Research Laboratory how on the nanoscale, electrons, excitons, phonons and spin may strongly couple at defect sites. (Photo Credit: Courtesy illustration)

Dr. YuHuang Wang, associate professor of chemistry at the University of Maryland, tells Army scientists and researchers at the Rodman Materials Research Laboratory how on the nanoscale, electrons, excitons, phonons and spin may strongly couple at defect sites. (Photo Credit: Courtesy illustration)

“Our research addresses active control and interaction of turbulence through nonlinear dynamics,” Glaz said. “In a recent publication in the journal Advanced Materials, we demonstrated that carbon nanotube thermoacoustics can withstand a much higher power input when defects at the CNT walls are protected by atomically thin layer of aluminum oxide, without adding a weight penalty. This advancement was critical to enabling high amplitude excitation of small scale turbulence frequencies corresponding to high ultrasound.

Their work was highlighted on the cover of an Advanced Materials issue.

As part of the ARL Open Campus initiative, the university and the laboratory collaborate in many areas leading to knowledge-building and research breakthroughs.

ARL fellow and senior research scientist Dr. Shashi Karna introduced Wang as a friend and respected colleague.

Associate Professor of chemistry YuHuang Wang, University of Maryland, tells Army scientists and researchers at the Rodman Materials Research Laboratory how on the nanoscale, electrons, excitons, phonons and spin may strongly couple at defect sites. (Photo Credit: David McNally)

Associate Professor of chemistry YuHuang Wang, University of Maryland, tells Army scientists and researchers at the Rodman Materials Research Laboratory how on the nanoscale, electrons, excitons, phonons and spin may strongly couple at defect sites. (Photo Credit: David McNally)

“I’ve been privileged to know YuHuang since two years before he finished his graduate degree,” Karna said. “He was a frequent visitor and became a friend.”

Karna said one of the reasons for inviting Wang to speak is because of the many opportunities for collaboration.

“The University of Maryland at College Park is next door,” he said. “We have an Open Campus relationship and there are opportunities to work with this group.”

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