scholarly journals Analysis of Homogeneity and Young's Moduli of Rubber Compounds by Atomic Force Microscopy

2021 ◽  
Author(s):  
Dana Bakošová ◽  
Alžbeta Bakošová
Keyword(s):  
Atomic Force Microscopy ◽  
Force Microscopy ◽  
Young’S Moduli ◽  
Atomic Force ◽  
Rubber Compounds

Young's Moduli of Surface-Bound Liposomes by Atomic Force Microscopy Force Measurements

Langmuir ◽  
2008 ◽  
Vol 24 (5) ◽  
pp. 2009-2014 ◽  
Author(s):  
Heïdi Brochu ◽  
Patrick Vermette
Keyword(s):  
Atomic Force Microscopy ◽  
Force Measurements ◽  
Force Microscopy ◽  
Young’S Moduli ◽  
Atomic Force

Nanoscale Indentation of Polymer and Composite Particles by Atomic Force Microscopy

2006 ◽  
Vol 942 ◽  
Author(s):  
Silvia Armini ◽  
Ivan U. Vakarelski ◽  
Caroline M. Whelan ◽  
Karen Maex ◽  
Ko Higashitani
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Chemical Mechanical Planarization ◽  
Silica Shell ◽  
Force Microscopy ◽  
Young’S Moduli ◽  
Atomic Force ◽  
Water Media ◽  
Potential Applications ◽  
Force Displacement

ABSTRACTAtomic Force Microscopy (AFM) was employed to probe the mechanical properties of surface-charged polymethylmethacrylate (PMMA)-based terpolymer and a composite terpolymer core-silica shell nanosphere in air and water media. Since these materials exhibit enhanced mechanical properties, such as toughness and elasticity, and enhanced chemical stability, they are particularly interesting for potential applications in reducing defectivity during the process of Chemical Mechanical Planarization. The polymer particles were subjected to a thermal treatment aimed at improving their mechanical properties in terms of hardness (H) and elastic modulus (E). By analysis of force-displacement curves and on the basis of Hertz's theory of contact mechanics, Young's moduli were measured for the terpolymer compared with the composite that has expected mechanical property enhancement due to its silica shell. In air, E increases from 4.3 GPa to 6.6 GPa for the treated terpolymer compared with the respective value of 10.3 GPa measured for the composite. In water, E increases from 1.6 GPa to 4.5 GPa for the thermally treated terpolymer that is comparable with the respective value of 3.6 GPa measured for the composite. This observation suggests that as an alternative to the creation of polymer-silica composite nanoparticles for CMP, comparable mechanical properties can be achieved by a simple heat treatment step.

scholarly journals Test-retest reproducibility of atomic force microscopy measurements of human trabecular meshwork stiffness

2020 ◽  
Vol 2 (4) ◽  
pp. 34-43
Author(s):  
Larry Kagemann ◽  
Joe Candiello ◽  
Gadi Wollstein ◽  
Hiroshi Ishikawa ◽  
Richard A. Bilonick ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Trabecular Meshwork ◽  
Human Donor ◽  
Tissue Samples ◽  
Force Microscopy ◽  
Young’S Moduli ◽  
Atomic Force ◽  
Coefficients Of Variation ◽  
Cryostat Sections ◽  
Anterior Posterior

Purpose: The purpose of the present study was to quantify test-retest reproducibility of measurements of stiffness of the human trabecular meshwork (HTM) by atomic force microscopy (AFM). Methods: Eleven 40 μm radial limbal cryostat sections from a fresh human donor rim were mounted on charged slides and rehydrated at room temperature. Stiffness at four TM locations (anterior to posterior along Schlemm’s canal) was measured by AFM. At each location, a 6 x 6 grid was sampled. Indentation points were evenly distributed over a 20 μm x 20 μm area, with a rate of one load/unload cycle per second. Measurements were then repeated for calculation of test-retest variability. Results: The test-retest coefficients of variation for the four measurement locations (anterior to posterior) were 24.39, 25.28, 12.74, and 14.26%, respectively, with a notable drop in the two posterior locations compared to the anterior. The test-retest coefficient for the sections was 19.17%. For the entire eye, the test-retest coefficient of variation for the measurement of the TM stiffness was 17.13%. Young’s moduli consistently decreased from anterior to posterior location. Conclusions: Wide regional variation suggests that single value does little to fully describe the complex array of TM stiffness levels within the eye, and future studies of TM stiffness assessed by AFM should include multiple tissue samples from each eye, with documentation of the anterior-posterior location of each measurement.

Young's moduli of cellulose nanofibers measured by atomic force microscopy

2018 ◽  
Author(s):  
Jaehwan Kim ◽  
Lindong Zhai ◽  
Hyun Chan Kim ◽  
Debora Kim ◽  
Ruth Mwongeli Muthoka
Keyword(s):  
Atomic Force Microscopy ◽  
Cellulose Nanofibers ◽  
Force Microscopy ◽  
Young’S Moduli ◽  
Atomic Force

AFM Study of Rubber Compounds

2005 ◽  
Vol 78 (1) ◽  
pp. 17-27 ◽  
Author(s):  
C. C. Wang ◽  
J. B. Donnet ◽  
T. K. Wang ◽  
M. Pontier-Johnson ◽  
F. Welsh
Keyword(s):  
Atomic Force Microscopy ◽  
Carbon Black ◽  
Surface Morphology ◽  
Force Microscopy ◽  
Carbon Blacks ◽  
Atomic Force ◽  
Rubber Compounds ◽  
Road Testing

Abstract A series of rubber compounds filled with carbon blacks and silica has been studied by atomic force microscopy (AFM). The microdispersion of carbon black aggregates in rubber compounds can be clearly observed. The surface morphology of worn treads after road testing studied by AFM is also reported.

Investigating the Mechanical Properties of Biological Brain Cells With Atomic Force Microscopy

2018 ◽  
Vol 12 (4) ◽  
Author(s):  
Tariq Mohana Bahwini ◽  
Yongmin Zhong ◽  
Chengfan Gu ◽  
Zeyad Nasa ◽  
Denny Oetomo
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Cancer Cells ◽  
Force Microscopy ◽  
Indentation Force ◽  
Young’S Moduli ◽  
Atomic Force ◽  
Fitting Algorithm ◽  
Cell Mechanical Properties

Characterization of cell mechanical properties plays an important role in disease diagnoses and treatments. This paper uses advanced atomic force microscopy (AFM) to measure the geometrical and mechanical properties of two different human brain normal HNC-2 and cancer U87 MG cells. Based on experimental measurement, it measures the cell deformation and indentation force to characterize cell mechanical properties. A fitting algorithm is developed to generate the force-loading curves from experimental data. An inverse Hertzian method is also established to identify Young's moduli for HNC-2 and U87 MG cells. The results demonstrate that Young's modulus of cancer cells is different from that of normal cells, which can help us to differentiate normal and cancer cells from the biomechanical viewpoint.

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