Nanometer‐scale Elasticity Measurements on Organic Monolayers Using Scanning Force Microscopy

Kiridena, Waruna; Jain, V.K.; Kuo, P. K.; Liu, Gang‐yu

doi:10.1002/(sici)1096-9918(199706)25:6<383::aid-sia246>3.3.co;2-j

Cited by 32 publications

(62 citation statements)

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“…The elastic modulus of the PFTS coating was unknown, but it is expected that the modulus value is in the range of 0.1-1 GPa from the estimated value of similar SAMs. 37 The elastic modulus of Si ͑100͒ is 130 GPa. 38 Therefore the elastic modulus of PFTS is negligible compared to that of silicon.…”

Section: ͑3͒mentioning

confidence: 99%

Velocity dependence and rest time effect on nanoscale friction of ultrathin films at high sliding velocities

Tao

Bhushan

2007

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Section: ͑3͒mentioning

confidence: 99%

Velocity dependence and rest time effect on nanoscale friction of ultrathin films at high sliding velocities

Tao

Bhushan

2007

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…Despite the importance of cuticular mechanical response to the environment, to our knowledge only a single study of cuticular rheology has been performed (Petracek and Bukovac, 1995). With the advent of AFM as a probe of surface nanomechanical behavior (Domke and Radmacher, 1998;Gracias and Somorjai, 1998;Kiridena et al, 1997;Laney et al, 1997;Overney et al, 1994;Radmacher et al, 1992), the effect of environmental or solvent changes on the cuticle's surface rheological behavior can be probed at the nanometer scale. Nanomechanical measurements made by AFM in-volve controlling the force with which the AFM probe is pressed against a sample material.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Water on the Nanomechanical Behavior of the Plant Biopolyester Cutin as Studied by AFM and Solid-State NMR

Round

Yan

Dang

et al. 2000

Biophysical Journal

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Atomic force microscopy and solid-state nuclear magnetic resonance have been used to investigate the effect of water absorption on the nanoscale elastic properties of the biopolyester, cutin, isolated from tomato fruit cuticle. Changes in the humidity and temperature at which fruits are grown or stored can affect the plant surface (cuticle) and modify its susceptibility to pathogenic attack by altering the cuticle's rheological properties. In this work, atomic force microscopy measurements of the surface mechanical properties of isolated plant cutin have been made as a first step to probing the impact of water uptake from the environment on surface flexibility. A dramatic decrease in surface elastic modulus (from approximately 32 to approximately 6 MPa) accompanies increases in water content as small as 2 wt %. Complementary solid-state nuclear magnetic resonance measurements reveal enhanced local mobility of the acyl chain segments with increasing water content, even at molecular sites remote from the covalent cross-links that are likely to play a crucial role in cutin's elastic properties.

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“…Kiridena of film and substrate. 92 The result, which contrasts with experience in the macroscopic world, is explained by the fact that modulus measurements via phase shift are sensitive only to the first atom layers. In air, mica is covered with a water film, which is detected by force modulation instead of the mica.…”

Section: Atomic Force Microscopy Tip Adhesion As a Hint To Chemical Mmentioning

confidence: 84%

“…92 A combined instrument with an optical microscope, an LFM instrument and a Vickers nanohardness tester was developed by the Centre Suisse d'Electronique et de Microtechnique (CSEM) in Neuchâtel, Switzerland. 114 The sample is transferred between the three stations with extremely high precision to hit the same area in all three tests.…”

Section: Forces and Mechanical Sample Propertiesmentioning

confidence: 99%

Microscopy of Coatings

Rädlein¹

2000

Encyclopedia of Analytical Chemistry

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Fundamental research on films and the development and optimization of coatings are not possible without high‐resolution imaging. This article describes the advantages and disadvantages of the newly introduced scanning probe microscopy (SPM) in comparison with well‐established microscopy techniques with light and particles [e.g. scanning electron microscopy (SEM) and transmission electron microscopy (TEM)], which are limited by the diffraction limit, i.e. 200 nm for conventional light microscopy and 4 nm for SEM. This limit does not hold for SPM, which uses near‐field interactions for imaging. Thus, even simple atoms or molecules can be resolved on well‐ordered structures by scanning tunneling microscopy (STM) or atomic force microscopy (AFM). Both possess an extremely good height sensitivity of 0.02 nm. 1 In the constant‐height operation mode, AFM can detect vertical forces as low as 10 −15 –10 −4 N. Atomic resolution is not always possible or not always necessary for many practical applications; a lateral resolution of a few nanometers is sufficient. Besides the capability of achieving this value with ease, simple sample preparation, versatile environmental conditions and observation of reactions in situ are advantages of STM and AFM. Especially AFM has proved to be a useful technique for investigating coatings, because it is independent of conductivity and provides topographic data together with information on structure, local variations of mechanical properties and surface alterations in different media. However, some artifacts and restrictions have to be considered which can differ considerably from customary electron micrographs with comparable resolutions, such as onset overswing and tip convolution. Microscopy helps in solving coating problems according to substrate quality, nucleation, wettability, thickness, roughness, microstructure, crystal phases (texture, orientation), lateral and vertical homogeneity, density, porosity, interfaces, adhesion, hardness, stress, scratch and abrasion resistance, tribology, wear and corrosion. Practical examples of microscopy results on these questions are presented together with suitable preparation methods and interpretation of artifacts.

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Nanometer‐scale Elasticity Measurements on Organic Monolayers Using Scanning Force Microscopy

Cited by 32 publications

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Velocity dependence and rest time effect on nanoscale friction of ultrathin films at high sliding velocities

Velocity dependence and rest time effect on nanoscale friction of ultrathin films at high sliding velocities

The Influence of Water on the Nanomechanical Behavior of the Plant Biopolyester Cutin as Studied by AFM and Solid-State NMR

Microscopy of Coatings

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