Modification of a Commercial Atomic Force Microscope for Nanorheological Experiments: Adsorbed Polymer Layers

2000 ◽  
Vol 6 (2) ◽  
pp. 121-128
Author(s):  
Shannon M. Notley ◽  
Vincent S. J. Craig ◽  
Simon Biggs
Keyword(s):  
Atomic Force Microscope ◽  
Phase Difference ◽  
Material Properties ◽  
Biological Samples ◽  
Surface Forces ◽  
Polymer Layers ◽  
Silica Surfaces ◽  
Atomic Force ◽  
Adsorbed Polymer

The atomic force microscope (AFM) has previously been applied to the measurement of surface forces (including adhesion and friction) and to the investigation of material properties, such as hardness. Here we describe the modification of a commercial AFM that enables the stiffness of interaction between surfaces to be measured concurrently with the surface forces. The stiffness is described by the rheological phase difference between the response of the AFM tip to a driving oscillation of the substrate. We present the interaction between silica surfaces bearing adsorbed polymer, however, the principles could be applied to a wide variety of materials including biological samples.

scholarly journals Nanoscale Measurement of Surface Roughness and the existing Surface Forces of Aluminum by AFM

2011 ◽  
Vol 2 ◽  
pp. 76-79
Author(s):  
Purna B Pun ◽  
Shobha K Lamichhane
Keyword(s):  
Surface Roughness ◽  
Atomic Force Microscope ◽  
Thermal Oxidation ◽  
Surface Force ◽  
Surface Forces ◽  
Crystal Defects ◽  
Surface Contamination ◽  
Thermal Agitation ◽  
Atomic Force ◽  
Aluminum Sample

The surface contamination affects Atomic Force Microscope (AFM) performance. Thermal agitation during mapping doping, thermal oxidation, annealing impurities and crystal defects promotes the roughness; various kinds of forces on the surface can be detected by the interaction between tip of cantilever and sample. This interaction not only help us to understand the characteristics and morphology of the sample but also useful to measure the surface force of the aluminum sample too.Key words: Atomic Force Microscope (AFM) performance; Thermal oxidation; Annealing impurities; Crystal defectsThe Himalayan Physics Vol.2, No.2, May, 2011Page: 76-79Uploaded Date: 1 August, 2011

Influence of Local Material Properties on the Nonlinear Dynamic Behavior of an Atomic Force Microscope Probe

2011 ◽  
Vol 6 (4) ◽  
Author(s):  
Wei Huang ◽  
Andrew J. Dick
Keyword(s):  
Atomic Force Microscope ◽  
Dynamic Behavior ◽  
Material Properties ◽  
Parametric Study ◽  
Period Doubling ◽  
Force Model ◽  
Atomic Force Microscope Probe ◽  
Atomic Force ◽  
The Relationship ◽  
Microscope Probe

In this paper, a study of the characteristics of period-doubling bifurcations in the dynamic behavior of an atomic force microscope probe for off-resonance excitation is presented. Using a three-mode approximation and excitation at two-and-a-half times the fundamental frequency, the relationship between the characteristics of the period-doubling bifurcation and the material properties is studied by using numerical simulations. Simulations are first used to successfully reproduce nonlinear response data collected experimentally by using a commercial atomic force microscope system and then to conduct a parametric study in order to examine the influence of variations in other system parameters on the relationship. These parameters are the excitation magnitude, the damping level, the cantilever stiffness, and the characteristics of the force model. Based upon the results of the parametric study, a new operation mode for obtaining localized material properties through an efficient scanning process is proposed. A preliminary scan simulation demonstrates the successful implementation of the relationship and its potential for providing localized material property information with nanoscale resolution.

scholarly journals Probing the surface forces of monolayer films with an atomic-force microscope

1990 ◽  
Vol 64 (16) ◽  
pp. 1931-1934 ◽  
Author(s):  
Nancy A. Burnham ◽  
Dawn D. Dominguez ◽  
Robert L. Mowery ◽  
Richard J. Colton
Keyword(s):  
Atomic Force Microscope ◽  
Surface Forces ◽  
Monolayer Films ◽  
Atomic Force

Static and dynamic profiles of tethered polymer layers probed by analyzing the noise of an atomic force microscope

1997 ◽  
Vol 56 (3) ◽  
pp. 3256-3264 ◽  
Author(s):  
Andreas Roters ◽  
Martin Gelbert ◽  
Martin Schimmel ◽  
Jürgen Rühe ◽  
Diethelm Johannsmann
Keyword(s):  
Atomic Force Microscope ◽  
Polymer Layers ◽  
Atomic Force

scholarly journals Photothermal excitation efficiency enhancement of cantilevers by electron beam deposition of amorphous carbon thin films

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Marcos Penedo ◽  
Ayhan Yurtsever ◽  
Keisuke Miyazawa ◽  
Hirotoshi Furusho ◽  
Kiyo-Aki Ishii ◽  
...  
Keyword(s):  
Atomic Force Microscope ◽  
Amorphous Carbon ◽  
Biological Samples ◽  
Oscillation Amplitude ◽  
Carbon Layer ◽  
Stable Operation ◽  
Excitation Efficiency ◽  
Atomic Force ◽  
Excitation Laser

Abstract In recent years, the atomic force microscope has proven to be a powerful tool for studying biological systems, mainly for its capability to measure in liquids with nanoscale resolution. Measuring tissues, cells or proteins in their physiological conditions gives us access to valuable information about their real ‘in vivo’ structure, dynamics and functionality which could then fuel disruptive medical and biological applications. The main problem faced by the atomic force microscope when working in liquid environments is the difficulty to generate clear cantilever resonance spectra, essential for stable operation and for high resolution imaging. Photothermal actuation overcomes this problem, as it generates clear resonance spectra free from spurious peaks. However, relatively high laser powers are required to achieve the desired cantilever oscillation amplitude, which could potentially damage biological samples. In this study, we demonstrate that the photothermal excitation efficiency can be enhanced by coating the cantilever with a thin amorphous carbon layer to increase the heat absorption from the laser, reducing the required excitation laser power and minimizing the damage to biological samples.

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