Quantification of droplet deformation by electromagnetic trapping
Quantification of droplet deformation by electromagnetic trapping
复制标题
通过电磁捕获对液滴变形进行量化
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
L. Oddershede
中科院分区：
文献类型：
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作者：
P. F. Møller;L. Oddershede
紧聚焦的激光对物体施加捕捉力，也对物体施加变形力。如果物体相对容易变形，例如低表面张力液滴，则即使在中等激光功率下，所产生的变形也很容易检测到。观察到的变形由一个模型解析解释，该模型定量地预测了任何微米大小的液滴的变形，其中唯一的恢复力是表面张力。还提供了理论工具以包括被困对象的壳和体积的弹性的影响，这对于细胞的变形特别重要。这种电磁辐射的变形效应是捕捉软材料时需要考虑的重要因素，可以用来确定软材料的物理特性。
A tightly focused laser beam exerting a trapping force on an object also exerts deformation forces on the object. If the object is relatively easy to deform, as is, e.g., a low surface tension droplet, the resulting deformation is easily detectable even at moderate laser powers. The observed deformation is analytically explained by a model, which quantitatively predicts the deformation of any micron-sized drop where the only restoring force is the surface tension. Theoretical tools are also provided to include the effect of elasticity of the shell and bulk of the trapped object, this being particularly important for deformations of cells. This deformation effect of electromagnetic radiation is important to consider while trapping soft materials and it can be used to determine physical characteristics of soft materials.