Nonreciprocality of a micromachine driven by a catalytic chemical reaction
Nonreciprocality of a micromachine driven by a catalytic chemical reaction
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催化化学反应驱动的微机械的非互易性
DOI：
10.1103/physreve.103.062113
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发表时间：
2021
影响因子：
2.4
通讯作者：
Komura Shigeyuki
中科院分区：
文献类型：
--
作者：
Yasuda Kento;Komura Shigeyuki
我们提出了一个模型来描述由催化化学反应驱动的微机器的循环状态转变。我们考虑了代表化学反应程度和微机器内部状态的变量的机械化学耦合。总自由能由一个倾斜的周期势和一个机械化学偶合能组成。我们假设反应变量服从确定性的逐步动力学，具有两个典型的时间尺度，即平均首次通过时间和平均首次跃迁路径时间。为了估计微机械的功能，我们将重点放在称为“非互向性”的量上，并进一步讨论其对催化反应性质的依赖。例如，我们证明了非互向性与平均第一跃迁路径时间的平方成正比。解耦近似模型中两个时间尺度的显式计算表明，非互向性与催化反应能量势垒的平方成反比。
We propose a model that describes cyclic state transitions of a micromachine driven by a catalytic chemical reaction. We consider a mechanochemical coupling of variables representing the degree of a chemical reaction and the internal state of a micromachine. The total free energy consists of a tilted periodic potential and a mechanochemical coupling energy. We assume that the reaction variable obeys a deterministic stepwise dynamics characterized by two typical timescales, i.e., the mean first passage time and the mean first transition path time. To estimate the functionality of a micromachine, we focus on the quantity called “nonreciprocality” and further discuss its dependence on the properties of catalytic reaction. For example, we show that the nonreciprocality is proportional to the square of the mean first transition path time. The explicit calculation of the two timescales within the decoupling approximation model reveals that the nonreciprocality is inversely proportional to the square of the energy barrier of catalytic reaction.