Comparative analysis on the nanoindentation of polymers using atomic force microscopy

Jee, Ah-Young; Lee, Minyung

doi:10.1016/j.polymertesting.2009.09.009

Cited by 194 publications

(135 citation statements)

References 30 publications

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“…Two well-characterised materials, that is, Poly(methyl methacrylate) -(PMMA); and Polystyrene -(PP) were measured and analysed with the exact same experimental procedure used for the bone samples. The analysis of the results for both materials returned the values of 4.5 ± 0.14 and 1.36 ± 0.02 GPa for the PMMA and PP respectively, which are similar to the values reported in the literature for these materials (Jee and Lee, 2010;Pukánszky et al, 1997), when measured using conventional nanoindentation (5.2 ± 0.5 and 2.0 ± 0.4 GPa for PMMA and PP respectively; data not shown).…”

Section: Discussionsupporting

confidence: 86%

Load-bearing in cortical bone microstructure: Selective stiffening and heterogeneous strain distribution at the lamellar level

Katsamenis

Chong

Andriotis

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

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An improved understanding of bone mechanics is vital in the development of evaluation strategies for patients at risk of bone fracture. The current evaluation approach based on bone mineral density (BMD) measurements lacks sensitivity, and it has become clear that as well as bone mass, bone quality should also be evaluated.The latter includes, among other parameters, the bone matrix material properties, which in turn depend on the hierarchical structural features that make up bone as well as their composition. Optimal load transfer, energy dissipation and toughening mechanisms have, to some extent, been uncovered in bone. Yet, the origin of these properties and their dependence upon the hierarchical structure and composition of bone are largely unknown. Here we investigate load transfer in the osteonal and subosteonal levels and the mechanical behaviour of osteonal lamellae and interlamellar areas during loading. Using cantilever-based nanoindentation, in situ microtensile testing during atomic force microscopy (AFM) and digital image correlation (DIC), we report evidence for a previously unknown mechanism. This mechanism transfers load and movement in a manner analogous to the engineered "elastomeric bearing pads" used in large engineering structures. ȝ-RAMAN microscopy investigations 2 showed compositional differences between lamellae and interlamellar areas. The latter have lower collagen content but an increased concentration of noncollagenous proteins (NCPs). Hence, NCPs enriched areas on the microscale might be similarly important for bone failure as on the nanoscale. Finally, we managed to capture stable crack propagation within the interlamellar areas in a time-lapsed fashion, proving their significant contribution towards fracture toughness.

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Section: Discussionsupporting

confidence: 86%

Load-bearing in cortical bone microstructure: Selective stiffening and heterogeneous strain distribution at the lamellar level

Katsamenis

Chong

Andriotis

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

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“…(1) at the maximum depth of penetration in the initial elastic response of the unloading curve (Fischer-Cripps, 2000;Jee & Lee, 2010), as it is shown in the inset of Fig. 5a.…”

Section: Nanoindentation Studiesmentioning

confidence: 84%

Surface stiffening and enhanced photoluminescence of ion implanted cellulose – polyvinyl alcohol – silica composite

Shanthini

Sakthivel

Menon

et al. 2016

Carbohydrate Polymers

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Novel Cellulose (Cel) reinforced polyvinyl alcohol (PVA)-Silica (Si) composite which has good stability and in vitro degradation was prepared by lyophilization technique and implanted using N 3+ ions of energy 24 keV in the fluences of 1 × 10 15 , 5 × 10 15 and 1 × 10 16 ions/cm 2 . SEM analysis revealed the formation of microstructures, and improved the surface roughness on ion implantation. In addition to these structural changes, the implantation significantly modified the luminescent, thermal and mechanical properties of the samples. The elastic modulus of the implanted samples has increased by about 50 times compared to the pristine which confirms that the stiffness of the sample surface has increased remarkably on ion implantation. The photoluminescence of the native cellulose has improved greatly due to defect site, dangling bonds and hydrogen passivation. Electric conductivity of the ion implanted samples was improved by about 25%. Hence, low energy ion implantation tunes the mechanical property, surface roughness and further induces the formation of nano structures. MG63 cells seeded onto the scaffolds reveals that with the increase in implantation fluence, the cell attachment, viability and proliferation have improved greatly compared to pristine. The enhancement of cell growth of about 59% was observed in the implanted samples compared to pristine. These properties will enable the scaffolds to be ideal for bone tissue engineering and imaging applications.

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“…Indeed, the indentation depth should be deep enough to minimize the surface effect. Meanwhile, the indentation depth should also be less than 10% of the film thickness when the sample is mounted on a hard substance; otherwise the obtained value is usually larger than the amount it should be, due to the effect of the support [41]. Therefore, the maximum indentation depth in our experiments was limited to 250 nm.…”

Section: Methodsmentioning

confidence: 93%

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

Karimzadeh¹,

Ayatollahi²,

Shirazi³

2014

IJMMM

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Abstract-The aim of this study was to evaluate the influence of thermocycling on the mechanical properties of a commercial dental nanocomposite by using the nano-indentation experiment. The resin-based nanocomposite contained silica and zirconia nanofillers. Some disk specimens, each with the diameter of 10 mm and the thickness of 4 mm were prepared and the specimens were stored at various environmental conditions. Some of the samples were kept in the ambient condition, other samples were stored in distilled water at room temperature and other ones were thermocycled in distilled water for 1000 cycles between 5°C and 55°C. After preparation of samples, the nano-indentation test was applied on the prepared specimens by Triboscope setup. Then the modulus of elasticity and hardness of the test samples were calculated from the Oliver-Pharr's method using the data obtained from nano-indentation test. The present research showed that the samples stored in distilled water without thermocycling exhibited the highest elasticity modulus when compared to the other samples. In addition, the maximum hardness was observed for thermocycled specimens in distilled water.

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Comparative analysis on the nanoindentation of polymers using atomic force microscopy

Cited by 194 publications

References 30 publications

Load-bearing in cortical bone microstructure: Selective stiffening and heterogeneous strain distribution at the lamellar level

Load-bearing in cortical bone microstructure: Selective stiffening and heterogeneous strain distribution at the lamellar level

Surface stiffening and enhanced photoluminescence of ion implanted cellulose – polyvinyl alcohol – silica composite

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

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