基于MicroMegascope的动态表面力仪
MicroMegascope based dynamic Surface Force Apparatus
摘要：
表面力仪（SFA）可以精确地解决扩展表面之间的流体的界面特性。SFA的准确性使其成为软物质系统的纳米级力学表征的普遍工具。SFA传统上通过具有亚纳米距离精度的干涉测量法来测量力-距离分布。然而，这些技术往往需要一个专门的和技术要求很高的实验装置，仍然需要通用和简单的力距离测量工具。在这里，我们提出了一种基于MicroMegascope的动态表面力装置能够精确测量的动态力的轮廓之间的毫米球和平面基板的液体限制。在经典的频率调制框架内测量法向和剪切机械阻抗。我们测量流变学和摩擦性能从微米到分子限制。我们还强调了小的界面特征，如离子液体分层的分辨率。该仪器显示出作为一种多功能的力-距离测量设备的异国情调的表面或极端环境的承诺。
英文摘要：
Surface Force Apparatus (SFA) allows to accurately resolve the interfacial properties of fluids confined between extended surfaces. The accuracy of the SFA makes it an ubiquitous tool for the nanoscale mechanical characterization of soft matter systems. The SFA traditionally measures force-distance profiles through interferometry with subnanometric distance precision. However, these techniques often require a dedicated and technically demanding experimental setup, and there remains a need for versatile and simple force-distance measurement tools. Here we present a MicroMegascope based dynamic Surface Force Apparatus capable of accurate measurement of the dynamic force profile of a liquid confined between a millimetric sphere and a planar substrate. Normal and shear mechanical impedance is measured within the classical Frequency Modulation framework. We measure rheological and frictional properties from micrometric to molecular confinement. We also highlight the resolution of small interfacial features such as ionic liquid layering. This apparatus shows promise as a versatile force-distance measurement device for exotic surfaces or extreme environments.
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