Like a tuning fork struck with a mallet, tiny gold nanodisks can be made to vibrate at resonant frequencies when struck by light. In new research, Rice University researchers showed they can selectively alter those vibrational frequencies by gathering different-sized nanodisks into groups.
‚ÄúIn the tuning fork analogy, it would be as if we could alter the sounds of several forks by bringing them close together,‚ÄĚ said Rice nanoscientist¬†Stephan Link, the lead researcher on¬†a study¬†in this week‚Äôs Proceedings of the National Academy of Sciences. ‚ÄúBut at the nanoscale, we do not hear a tonal shift; we instead see a tiny change in color. We‚Äôve shown that by grouping nanodisks, we can shift their acoustic resonance in an orderly and predictable way, which could be useful in optomechanics.‚ÄĚ
Like a tuning fork struck with a mallet, gold nanodisks on a glass surface can be made to vibrate at resonant frequencies with a pulse of laser light. Rice University researchers found that acoustic vibrations from larger particles modified the resonant frequencies of smaller particles nearby. (Image courtesy of C. Yi/Rice University)
To make continuous, strong and conductive carbon nanotube fibers, it‚Äôs best to start with long nanotubes, according to scientists at Rice University.
The Rice lab of chemist and chemical engineer Matteo Pasquali, which demonstrated its¬†pioneering method to spin carbon nanotube into fibers¬†in 2013, has advanced the art of making nanotube-based materials with two new papers in the American Chemical Society‚Äôs¬†ACS Applied Materials and Interfaces.
Iron impurities are easy to see in a bundle of carbon nanotubes viewed through a transmission electron microscope. Researchers at Rice University and the National University of Singapore are leading the charge to purify nanotubes for use in continuous, strong and conductive carbon nanotube fibers. Courtesy of the Pasquali Group
NEST360¬į, a visionary 10-year effort to save the lives of 500,000 African babies per year, is a finalist for the MacArthur Foundation‚Äôs first $100 million¬†100&Change¬†grant.
NEST360¬į¬†is one of¬†four 100&Change finalists¬†named today by the foundation. One finalist will be awarded $100 million in December. The¬†100&Change¬†competition, which¬†began¬†more than a year ago, aims to solve one of the world‚Äôs critical problems. The competition drew more than 1,900 applications, and eight semifinalists were selected in February.
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Rice University‚Äôs latest nanophotonics research could expand the color palette for companies in the fast-growing market for glass windows that change color at the flick of an electric switch. In a new paper in the American Chemical Society journal ACS Nano, researchers from the laboratory of Rice plasmonics pioneer Naomi Halas report using a readily available, inexpensive hydrocarbon molecule called perylene to create glass that can turn two different colors at low voltages.¬†
Grant Stec (undergraduate) and Adam Lauchner (graduate student, Applied Physics) of Rice University‚Äôs Laboratory for Nanophotonics have used an inexpensive hydrocarbon molecule called perylene to create a low-voltage, multicolor, electrochromic glass. (Photo by Jeff Fitlow/Rice University)