Scratching the Surface:  Fundamental Investigations of Tribology with Atomic Force Microscopy

Carpick, Robert W.; Salmerón, Miquel

doi:10.1021/cr960068q

Cited by 1,027 publications

(903 citation statements)

References 266 publications

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“…The TNT films were characterized by atomic force microscopy (AFM) [49][50][51], which revealed that the nanotubes well covered the whole surface of the silicon wafer, the OWLS chip and the glass plate homogeneously (Fig. 1) The arithmetic average roughness (R a ) and root mean squared roughness (RMS) [13,52] of the surface were calculated from the AFM data, and were approximately 3.9 nm and 5.3 nm, respectively.…”

Section: Surface Morphology and Optical Characterization Of The Titanmentioning

confidence: 99%

Enhanced protein adsorption and cellular adhesion using transparent titanate nanotube thin films made by a simple and inexpensive room temperature process: Application to optical biochips

Nádor

Orgován

Fried

et al. 2014

Colloids and Surfaces B: Biointerfaces

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Please cite this article in press as: J. Nador, et al., Enhanced protein adsorption and cellular adhesion using transparent titanate nanotube thin films made by a simple and inexpensive room temperature process: Application to optical biochips, Colloids Surf. a b s t r a c tA new type of titanate nanotube (TNT) coating is investigated for exploitation in biosensor applications. The TNT layers were prepared from stable but additive-free sols without applying any binding compounds. The simple, fast spin-coating process was carried out at room temperature, and resulted in well-formed films around 10 nm thick. The films are highly transparent as expected from their nanostructure and may, therefore, be useful as coatings for surface-sensitive optical biosensors to enhance the specific surface area. In addition, these novel coatings could be applied to medical implant surfaces to control cellular adhesion. Their morphology and structure was characterized by spectroscopic ellipsometry (SE) and atomic force microscopy (AFM), and their chemical state by X-ray photoelectron spectroscopy (XPS). For quantitative surface adhesion studies, the films were prepared on optical waveguides. The coated waveguides were shown to still guide light; thus, their sensing capability remains. Protein adsorption and cell adhesion studies on the titanate nanotube films and on smooth control surfaces revealed that the nanostructured titanate enhanced the adsorption of albumin; furthermore, the coatings considerably enhanced the adhesion of living mammalian cells (human embryonic kidney and preosteoblast).

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Section: Surface Morphology and Optical Characterization Of The Titanmentioning

confidence: 99%

Enhanced protein adsorption and cellular adhesion using transparent titanate nanotube thin films made by a simple and inexpensive room temperature process: Application to optical biochips

Nádor

Orgován

Fried

et al. 2014

Colloids and Surfaces B: Biointerfaces

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“…This approach is widely used for atomic force microscopy (AFM) due to its simplicity. 30 However, for non-contact AFM applications, when the gradient of the Van der Waals force exceeds the stiffness of the cantilever, snap-down instability occurs [19], which is analogous to the pull-in effect occurring in parallel plate actuation.…”

mentioning

confidence: 99%

A force sensor based on three weakly coupled resonators with ultrahigh sensitivity

Zhao

Wood

Xie

et al. 2015

Sensors and Actuators A: Physical

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A force sensor based on three weakly coupled resonators with ultrahigh sensitivity, Sensors & Actuators: A. Physical (2015), http://dx.doi.org/10.1016/j.sna. 2015.05.011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractA proof-of-concept force sensor based on three degree-of-freedom (DoF) weakly coupled resonators was fabricated using a silicon-on-insulator (SOI) process and electrically tested in 20µTorr vacuum. Compared to the conventional single resonator force sensor with frequency shift as output, by measuring the amplitude ratio of two of the three resonators, the measured force sensitivity of the 3DoF sensor was 4.9 × 10 6 /N, which was improved by two orders magnitude. A bias stiffness perturbation was applied to avoid mode aliasing effect and improve the linearity of the sensor. The noise floor of the amplitude ratio output of the sensor was theoretically analyzed for the first time, using the transfer function model of the 3DoF weakly coupled resonator system. It was shown based on measurement results that the output noise was mainly due to the thermalelectrical noise of the interface electronics. The output noise spectral density was measured, and agreed well with theoretical estimations. The noise floor of the force sensor output was estimated to be approximately 1.39nN for an assumed 10Hz bandwidth of the output signal, resulting in a dynamic range of 74.8dB.

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“…Monolayers formed from self-assembly, such as alkanethiols and alkylsilanes, which are covalently bonded to the substrate, may be good candidates for boundary-layer lubricants. As a result, the mechanical and tribological properties of self-assembled monolayer (SAM) materials have been studied a great deal using scanning probe microscopies (Carpick & Salmeron 1997;Liley et al 1998;Harrison et al 2004 The properties of SAMs containing chains with diacetylene moieties have been studied using the AFM (Mowery et al 1999;Cheadle et al 2001). Because the crosslinked backbone (which is the result of exposure to UV radiation) demonstrates a chromatic response to elevated temperature and stress, these structures have the potential to be used as molecular sensors (Enkelmann 1984;Burns et al 2001).…”

Section: (A ) Chemical Reactions Between Diamond Surfacesmentioning

confidence: 99%

“…One of the first experimental techniques to be developed for the fundamental studies of friction was the surface force apparatus (SFA; Ruths & Israelachvili 2007). Other techniques include the quartz crystal microbalance (QCM; Krim & Widom 1988) and scanning probe microscopies (Binnig et al 1986;Carpick & Salmeron 1997;Gnecco et al 2007). While all these techniques have played pivotal roles in the examination of the fundamental origins of friction, the atomic force microscope (AFM) is, perhaps, the most widely used technique.…”

Section: Introductionmentioning

confidence: 99%

Friction between solids

Harrison

Gao

Schall

et al. 2007

Phil. Trans. R. Soc. A.

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The theoretical examination of the friction between solids is discussed with a focus on self-assembled monolayers, carbon-containing materials and antiwear additives. Important findings are illustrated by describing examples where simulations have complemented experimental work by providing a deeper understanding of the molecular origins of friction. Most of the work discussed herein makes use of classical molecular dynamics (MD) simulations. Of course, classical MD is not the only theoretical tool available to study friction. In view of that, a brief review of the early models of friction is also given. It should be noted that some topics related to the friction between solids, i.e. theory of electronic friction, are not discussed here but will be discussed in a subsequent review.

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Scratching the Surface: Fundamental Investigations of Tribology with Atomic Force Microscopy

Cited by 1,027 publications

References 266 publications

Enhanced protein adsorption and cellular adhesion using transparent titanate nanotube thin films made by a simple and inexpensive room temperature process: Application to optical biochips

Enhanced protein adsorption and cellular adhesion using transparent titanate nanotube thin films made by a simple and inexpensive room temperature process: Application to optical biochips

A force sensor based on three weakly coupled resonators with ultrahigh sensitivity

Friction between solids

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