Modeling of Soft Sample Deformation in Atomic Force Microscope Imaging: Live Mammalian Cell Example

Juan Ren, Qingze Zou

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A model of the scanning-caused soft sample deformation during atomic force microscope contact-mode (CM) imaging is developed. CM imaging has been widely used for topography characterization of live biological samples such as live cells. However, due to the intrinsic softness of these samples, the sample surface deformation caused by the probe–sample interaction leads to significant error in the topography images obtained, and damage to the live biological sample. Although the deformation can be reduced by imaging at a rather slow scan rate (e.g., less than 0.2 Hz), such a low-speed imaging not only is time consuming, but also inevitably induces large temporal error. In this work, the scanning-caused surface deformation of soft samples is modeled and quantified, including live biological samples in CM imaging. Effects of both the scanning and the coupling between the vertical and the lateral deformation on the deformation are characterized. The proposed deformation model is validated by implementing it to quantify the topography image difference caused by the scanning-caused surface deformation of live prostate cancer cells imaged at two different (high and low) speeds, respectively.

Original languageEnglish (US)
Article number1800036
JournalAdvanced Theory and Simulations
Volume2
Issue number1
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • General
  • Numerical Analysis
  • Statistics and Probability
  • Modeling and Simulation

Keywords

  • cell imaging
  • sample deformation modeling
  • scanning probe microscopy

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