Optimizing nano-dynamic mechanical analysis for high-resolution, elastic modulus mapping in organic-rich shales

Wilkinson, Taylor M.; Zargari, Saeed; Prasad, Manika; Packard, Corinne E.

doi:10.1007/s10853-014-8682-5

Cited by 59 publications

(34 citation statements)

References 17 publications

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“…Viscoelastic materials, as dentin deform according to a combination of these properties and, as such, exhibit timedependent strain (Hayot et al, 2012). The complex modulus, as a measure of the resistance of a material to dynamic deformation (Ryou et al, 2013), can be decomposed into storage (elastic) and loss (damping) modulus components (Wilkinson et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Ions-modified nanoparticles affect functional remineralization and energy dissipation through the resin-dentin interface

Toledano

Osorio

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

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The aim of this study was to evaluate changes in the mechanical and chemical behavior, and bonding ability at dentin interfaces infiltrated with polymeric nanoparticles (NPs) prior to resin application. Dentin surfaces were treated with 37% phosphoric acid followed by application of an ethanol suspension of NPs, Zn-NPs or Ca-NPs followed by the application of an adhesive, Single Bond (SB). Bonded interfaces were stored for 24 h, submitted to microtensile bond strength test, and evaluated by scanning electron microscopy. After 24 h and 21 d of storage, the whole resin-dentin interface adhesive was evaluated using a Nano-DMA. Complex modulus, storage modulus and tan delta (δ) were assessed. AFM imaging and Raman analysis were performed. Bond strength was not affected by NPs infiltration. After 21 d of storage, tan δ generally decreased at Zn-NPs/resin-dentin interface, and augmented when Ca-NPs or non-doped NPs were used. When both Zn-NPs and Ca-NPs were employed, the storage modulus and complex modulus decreased, though both moduli increased at the adhesive and at peritubular dentin after Zn-NPs infiltration. The phosphate and the carbonate peaks, and carbonate substitution, augmented more at interfaces promoted with Ca-NPs than with Zn-NPs after 21 d of storage, but crystallinity did not differ at created interfaces with both ions-doped NPs. Crosslinking of collagen and the secondary structure of collagen improved with Zn-NPs resin-dentin infiltration. Ca-NPs-resin dentin infiltration produced a favorable dissipation of energy with minimal stress concentration trough the crystalline remineralized resin-dentin interface, causing minor damage at this structure.

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Section: Introductionmentioning

confidence: 99%

Ions-modified nanoparticles affect functional remineralization and energy dissipation through the resin-dentin interface

Toledano

Osorio

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

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“…Despite previous studies on the texture of organic-rich rocks in relation to their elastic properties, anisotropy (Vernik and Nur, 1992), and mechanical characteristics of the grains (Prasad, 2001;Zeszotarski et al, 2004;Ahmadov et al, 2009;Mba and Prasad, 2010;Prasad et al, 2011;Wilkinson et al, 2014;Eliyahu et al, 2015), there is limited available data on the characteristics of some essential components, such as clays and organic matter. Moreover, changes in the properties of kerogen and clay minerals during the course of thermal maturation are poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal maturity on elastic properties of kerogen

et al. 2016

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We have performed spatially continuous nanodynamic mechanical analysis on four organic-rich shale samples with different thermal maturities to extract the elastic modulus of the kerogen particles. Aliquots were rigorously prepared, and three scans were acquired from each aliquot. Subcritical nitrogen adsorption pore characterization was performed to determine the abundance of kerogen-hosted porosity. To fully characterize the pore system of samples from the oil window, toluene and then chloroform extraction were performed to remove the pore-filling hydrocarbons prior to nitrogen adsorption. The statistical distribution of the measured modulus values was analyzed to extract the properties of the shale particles. In mature samples from the peak oil generation or gas window, the kerogen porosity was the dominant pore morphology. We found that significant lowering of the kerogen particle modulus resulted from intraparticle kerogen porosity. The kerogen particle modulus in mature samples was measured as being lower (7-12 GPa) than the immature sample (15-20 GPa) due to gas-or bitumen-filled pores.

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“…From these experiments we obtained the nanohardness (Hi) and the nanoindentation modulus (E i ) of the samples. At this point, we would like to mention that the nanoindentation modulus obtained by this method is usually referred to as Young's modulus in the literature, which however should not be confounded with the Young's modulus obtained at the macroscopic level 21 In nanoindentation experiments the indenter was progressively (at a constant rate) pressed over the sample up to a peak load of 4000 µN (loading part of the experiment) and, afterwards, the load was progressively released to zero value (unloading part of the experiment). From these experiments the load, F, was obtained as a function of the penetration depth, h, of the indenter in the sample.…”

Section: Nano-indentation Testmentioning

confidence: 99%

“…Elastic materials strain instantaneously when load is removed [21] . The elastic response between the peritubular and intertubular dentin regions has long been compared and it has been established that peritubular dentin is a highly mineralized material harder and more elastic than the more compliant intertubular dentin [22] .…”

Section: Introductionmentioning

confidence: 99%

Ex vivo detection and characterization of remineralized carious dentin, by nanoindentation and single point Raman spectroscopy, after amalgam restoration

Osorio

Aguilera

Cabello

et al. 2016

J Raman Spectroscopy

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The aim of this study was to assess the mechanical and chemical performance of sound and caries-affected dentin (CAD), after Zn-free vs containing amalgam restorations placement and thermocycling. Dentin surfaces were studied by Atomic Force Microscopy (AFM) analysis for surface morphological characterization (including fibril diameter assessment), nano-indentation (to measure nano-hardness-Hi and modulus of Young-Ei), and single point Raman spectroscopy for chemical analysis. Measurements were performed before amalgam placement, after amalgam removal, and after 3 months of thermocycling (100,000cy/5 ºC and 55 ºC). Restorations increased both Hi and Ei at intertubular dentin of CAD. The highest values of Hi were achieved at intertubular dentin after restoring with Zn-containing amalgams. Remineralization of dentin was attributed to the increase of both amorphous and crystalline new mineral, as lower degrees of crystal imperfections in junction with crystal disorders, and improvement in structural stability of collagen were found. Higher presence of minerals were also confirmed after the decrease of fluoridated apatite and the increase of the total water content. Proteoglycans, lipids, and proteins, augmented in both sound and CAD, providing support for the mineral growing. The increase of bands assigned to vibration of carbonate calcium phosphate contributed to a decrease of crystallinity.

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Optimizing nano-dynamic mechanical analysis for high-resolution, elastic modulus mapping in organic-rich shales

Cited by 59 publications

References 17 publications

Ions-modified nanoparticles affect functional remineralization and energy dissipation through the resin-dentin interface

Ions-modified nanoparticles affect functional remineralization and energy dissipation through the resin-dentin interface

Effect of thermal maturity on elastic properties of kerogen

Ex vivo detection and characterization of remineralized carious dentin, by nanoindentation and single point Raman spectroscopy, after amalgam restoration

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