Energy dissipation effects on imaging of soft materials by dynamic atomic force microscopy : a DNA-chip study

Copyright © 2013 Elsevier B.V. All rights reserved..

Using amplitude-mode AFM (AM-AFM), we have obtained valuable information during these recent years through the study of amplitude and phase shift dependence on tip-sample separation, leading to a comprehensive understanding of the interaction processes. Two imaging regimes, attractive and repulsive, have been identified and a relationship between phase and dissipative energy was established, providing information on observed material properties. Most of the previous studies have concerned model systems: either hard or soft materials. In this paper, we present the analysis of a mixed system of soft structures on a hard substrate. This is a DNA chip for biological applications consisting of oligonucleotides covalently linked by a layer of silane to a silicon substrate. A detailed study of amplitude-phase curves as a function of the tip-sample separation allowed us to define the best experimental conditions to obtain specific information: we got reliable conditions to minimize noise during topographic imaging and an understanding of the processes of energy dissipation involved in the DNA breaking for DNA arrays. By calculating the energy dissipated as a function of the amplitude of oscillation, we have demonstrated a transition from an energy dissipation process governed by localized viscoelastic interactions (due to the soft layer) to a process governed by extended irreversible deformations (due to the hard substrate).

Medienart:

E-Artikel

Erscheinungsjahr:

2013

Erschienen:

2013

Enthalten in:

Zur Gesamtaufnahme - volume:33

Enthalten in:

Materials science & engineering. C, Materials for biological applications - 33(2013), 4 vom: 01. Mai, Seite 2311-6

Sprache:

Englisch

Beteiligte Personen:

Phaner-Goutorbe, M [VerfasserIn]
Iazykov, M [VerfasserIn]
Villey, R [VerfasserIn]
Sicard, D [VerfasserIn]
Robach, Y [VerfasserIn]

Links:

Volltext

Themen:

Biocompatible Materials
Journal Article

Anmerkungen:

Date Completed 03.09.2013

Date Revised 18.03.2013

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.msec.2013.01.055

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM225855917