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- W2000521371 abstract "We deal with the issue of quantifying and optimizing the rotation dynamics of synthetic molecular motors. For this purpose, the continuous four-stage rotation behavior of a typical light-activated molecular motor was measured in detail. All reaction constants were determined empirically. Next, we developed a Markov model that describes the full motor dynamics mathematically. We derived expressions for a set of characteristic quantities, i.e., the average rate of quarter rotations or “velocity,” V , the spread in the average number of quarter rotations, D , and the dimensionless Péclet number, Pe = V/D . Furthermore, we determined the rate of full, four-step rotations (Ω eff ), from which we derived another dimensionless quantity, the “rotational excess,” r.e . This quantity, defined as the relative difference between total forward (Ω + ) and backward (Ω − ) full rotations, is a good measure of the unidirectionality of the rotation process. Our model provides a pragmatic tool to optimize motor performance. We demonstrate this by calculating V , D , Pe , Ω eff , and r.e. for different rates of thermal versus photochemical energy input. We find that for a given light intensity, an optimal temperature range exists in which the motor exhibits excellent efficiency and unidirectional behavior, above or below which motor performance decreases." @default.
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- W2000521371 date "2009-10-06" @default.
- W2000521371 modified "2023-10-18" @default.
- W2000521371 title "Optimizing rotary processes in synthetic molecular motors" @default.
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- W2000521371 doi "https://doi.org/10.1073/pnas.0903710106" @default.
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