The researchers needed the right material platform to leverage that rapid kinetic moment, so they turned to McEuen and Cohen, who had worked with Muller to develop ultrathin platinum sheets capped with titanium. You can operate your chemical actuator around those rapid steps, and just ignore the rest of it." "If you understand the elementary reaction steps in a catalytic pathway, you can go in and sort of surgically extract out the rapid steps. It actually goes through an excursion into a bent state, a curvature, which is more extreme than either of the two end states," Abbott said. "If you look at the response of the chemical actuator, it's not that it goes from one state directly to the other state.
However, Abbott's group found a loophole of sorts while reviewing data from a catalysis experiment: a small section of the chemical reaction pathway contained both slow and fast steps. Prior efforts depended on chemical reactions that could only occur in extreme conditions, such as at high temperatures of several 100 degrees Celsius, and the reactions were often tediously slow-sometimes as long as 10 minutes-making the approach impractical for everyday technological applications. Credit: Proceedings of the National Academy of Sciences (2023). Reversible actuation of a SCA during cycles of exposure to a O 2-H 2 mixture (10:1) and H 2 at room temperature (real time). "But if you look for direct chemical to mechanical transductions, actually there are very few options." "There are quite good technologies for electrical to mechanical energy transduction, such as the electric motor, and the McEuen and Cohen groups have shown a strategy for doing that on the microscale, with their robots," Abbott said. Eckert Professor of Engineering in Cornell Engineering. Newman Professor of Physical Science, both in the College of Arts and Sciences and David Muller, the Samuel B. Smith School of Chemical and Biomolecular Engineering in Cornell Engineering, along with Itai Cohen, professor of physics, and Paul McEuen, the John A. The project was led by senior author Nicholas Abbott, a Tisch University Professor in the Robert F. '22, and former postdoctoral researcher Qingkun Liu, Ph.D. The paper's co-lead authors are Nanqi Bao, Ph.D.
The group's paper, "Gas-Phase Microactuation Using Kinetically Controlled Surface States of Ultrathin Catalytic Sheets," published May 1 in Proceedings of the National Academy of Sciences. The approach could one day lead to the creation of a new fleet of tiny autonomous devices that can rapidly respond to their chemical environment.
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