Development of atomic force microscope with wide-band magnetic excitation for study of soft matter dynamics
Development of atomic force microscope with wide-band magnetic excitation for study of soft matter dynamics
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DOI：
10.1063/1.3080557
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发表时间：
2009-02-01
影响因子：
1.6
通讯作者：
Sugawara, Yasuhiro
中科院分区：
文献类型：
--
作者：
Kageshima, Masami;Chikamoto, Takuma;Sugawara, Yasuhiro
为了探索聚合物、结构液体等介观软物质系统的动力学性质，研制了一种新的宽带磁悬臂梁激励原子力显微镜装置。采用闭环驱动电路实现了电磁铁的恒流驱动，驱动频率可达1 MHz。在蒸馏水中，在1-1000 kHz的频率范围内测量了附着有磁性颗粒的商业悬臂梁的传递函数。与其他研究小组的理论预测相比，激光光斑的位置，施加在悬臂梁上的力的分布，和不同的检测方案上得到的传递函数的影响进行了讨论。示出了一个单一的葡聚糖链的粘弹性光谱测量的初步结果，并与最近的理论计算进行了比较。
In order to probe dynamical properties of mesoscopic soft matter systems such as polymers, structured liquid, etc., a new atomic force microscopy apparatus with a wide-band magnetic cantilever excitation system was developed. Constant-current driving of an electromagnet up to 1 MHz was implemented with a closed-loop driver circuit. Transfer function of a commercial cantilever attached with a magnetic particle was measured in a frequency range of 1-1000 kHz in distilled water. Effects of the laser spot position, distribution of the force exerted on the cantilever, and difference in the detection scheme on the obtained transfer function are discussed in comparison with theoretical predictions by other research groups. A preliminary result of viscoelasticity spectrum measurement of a single dextran chain is shown and is compared with a recent theoretical calculation.