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Minimizing tip–sample forces in jumping mode atomic force microscopy in liquid

Authors
Journal
Ultramicroscopy
0304-3991
Publisher
Elsevier
Volume
114
Identifiers
DOI: 10.1016/j.ultramic.2012.01.007
Keywords
  • Atomic Force Microscopy
  • Scanning In Liquids
  • Virus
Disciplines
  • Biology

Abstract

Abstract Control and minimization of tip–sample interaction forces are imperative tasks to maximize the performance of atomic force microscopy. In particular, when imaging soft biological matter in liquids, the cantilever dragging force prevents identification of the tip–sample mechanical contact, resulting in deleterious interaction with the specimen. In this work we present an improved jumping mode procedure that allows detecting the tip–sample contact with high accuracy, thus minimizing the scanning forces (∼100pN) during the approach cycles. To illustrate this method we report images of human adenovirus and T7 bacteriophage particles which are prone to uncontrolled modifications when using conventional jumping mode.

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