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Title: Gas-phase microactuation using kinetically controlled surface states of ultrathin catalytic sheets

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4];  [3]; ORCiD logo [3];  [3]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]
  1. Cornell Univ., Ithaca, NY (United States); Cornell University Smith School of Chemical and Biomolecular Engineering
  2. Cornell Univ., Ithaca, NY (United States); Shanghai Jiao Tong Univ. (China)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Univ. of Wisconsin, Madison, WI (United States)

Biological systems convert chemical energy into mechanical work by using protein catalysts that assume kinetically controlled conformational states. Synthetic chemomechanical systems using chemical catalysis have been reported, but they are slow, require high temperatures to operate, or indirectly perform work by harnessing reaction products in liquids (e.g., heat or protons). Here, we introduce a bioinspired chemical strategy for gas-phase chemomechanical transduction that sequences the elementary steps of catalytic reactions on ultrathin (<10 nm) platinum sheets to generate surface stresses that directly drive microactuation (bending radii of 700 nm) at ambient conditions (T = 20 °C; Ptotal = 1 atm). When fueled by hydrogen gas and either oxygen or ozone gas, we show how kinetically controlled surface states of the catalyst can be exploited to achieve fast actuation (600 ms/cycle) at 20 °C. Finally, we also show that the approach can integrate photochemically controlled reactions and can be used to drive the reconfiguration of microhinges and complex origami- and kirigami-based microstructures.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Science Foundation (NSF); US Army Research Office (ARO); US Air Force Office of Scientific Research (AFOSR)
Contributing Organization:
Lawrence Berkeley National Laboratory (LBNL). National Energy Research Scientific Computing Center (NERSC); Cornell NanoScale Facility
Grant/Contract Number:
FG02-05ER15731; AC02-05CH11231
OSTI ID:
2008030
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 19 Vol. 120; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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