谐振器
附加质量
吸附
材料科学
粒子(生态学)
频移
质量浓度(化学)
Q系数
微珠(研究)
有效质量(弹簧-质量系统)
纳米技术
化学
分析化学(期刊)
光电子学
光学
声学
色谱法
物理
振动
经典力学
有机化学
物理化学
地质学
海洋学
生物化学
作者
P. Peiker,E. Oesterschulze
摘要
Weighing individual micro- or nanoscale particles in solution using dynamic micromechanical sensors is quite challenging: viscous losses dramatically degrade the sensor's performance by both broadening the resonance peak and increasing the effective total mass of the resonator by the dragged liquid. While the virtual mass of the resonator was discussed frequently, little attention has been paid to the virtual mass of particles attached to the resonator's surface and its impact on the accuracy of mass sensing. By means of the in situ detection of a polystyrene microbead in water using a bridge-based microresonator, we demonstrate that the virtual mass of the bead significantly affects the observed frequency shift. In fact, 55% of the frequency shift was caused by the virtual mass of the adsorbed bead, predicted by Stoke's theory. Based on the observed shift in the resonator's quality factor during particle adsorption, we confirm this significant effect of the virtual mass. Thus, a quantitative analysis of the mass of a single adsorbed particle is strongly diminished if dynamic micromechanical sensors are operated in a liquid environment.
科研通智能强力驱动
Strongly Powered by AbleSci AI