化学驱动浴的力学特征
Mechanical Signature of a Chemically Driven Bath
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中文总结 AI 辅助
本研究通过光镊实验发现，CuAAC点击反应使被困胶体位置涨落增加至少20%，噪声呈高斯型且与反应速率解耦，表明化学驱动浴的机械作用非独立分子事件之和。
中文摘要 AI 辅助
利用光镊，我们证明了CuAAC点击反应使被困的2微米胶体粒子的位置涨落增加至少20%，而不改变陷阱的角频率。这种多余的方差随着试剂的耗尽而弛豫到热基线。额外的噪声是高斯型的，其平坦的功率谱延伸超过角频率直至7 kHz。值得注意的是，噪声幅度与宏观反应速率解耦，且独立的分子力偶极子比产生观察到的方差所需的小数个数量级。尽管局部释放的化学自由能超过珠子吸收的能量五个数量级，但这种能量耦合效率低下。反应浴的机械作用不能表示为独立分子事件的总和。
英文摘要
Using optical tweezers, we demonstrate that the CuAAC click reaction increases the positional fluctuations of a trapped 2 micrometer colloid by at least 20% without altering the trap's corner frequency. This excess variance relaxes to the thermal baseline as reagents are depleted. The additional noise is Gaussian, with a flat power spectrum extending past the corner frequency up to 7 kHz. Notably, the noise amplitude decouples from the macroscale reaction rate, and independent molecular force dipoles are orders of magnitude too small to generate the observed variance. Although the chemical free energy released locally exceeds the energy absorbed by the bead by five orders of magnitude, this energy couples inefficiently. The mechanical action of the reacting bath cannot be represented as a sum of independent molecular events.
发表机构
- University of Massachusetts Amherst（马萨诸塞大学阿默斯特分校）
- Institute for Basic Science, Ulsan National Institute of Science and Technology（蔚山科学技术院基础科学研究院）
机构由 AI 辅助整理，请以论文原文为准。
