Evaluation of surface properties of epoxy–nanodiamonds composites

Koumoulos, Elias P.; Jagadale, Pravin; Lorenzi, Andrea; Tagliaferro, Alberto; Charitidis, Constantinos A.

doi:10.1016/j.compositesb.2015.05.036

Cited by 52 publications

(25 citation statements)

References 63 publications

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“…The nanomechanical test instrument employed in this study is equipped with a SPM (for imaging, a sharp Berkovich diamond indenter of 50nm radius was used), in which a sharp probe tip moves in a raster scan pattern across a sample surface using a three-axis piezo positioner. Details about the instrument and the experimental setup have been presented elsewhere [16]. Prior to indentation, the area function of the indenter tip was calibrated in a fused silica and in a soft PS-6 sheet (E r = 0.007 GPa (7 MPa)) for shallow depths, standard materials for this purpose; getting modulus and hardness values from small (~4-5 nm) indentation depths requires a very careful calibration of the tip.…”

Section: Characterisation Methodsmentioning

confidence: 99%

“…Prior to indentation, the area function of the indenter tip was calibrated in a fused silica and in a soft PS-6 sheet (E r = 0.007 GPa (7 MPa)) for shallow depths, standard materials for this purpose; getting modulus and hardness values from small (~4-5 nm) indentation depths requires a very careful calibration of the tip. All nanoindentation tests were conducted in a clean area environment with 45% humidity and 23°C ambient temperature, at 200nm of displacement, with displacement feedback control closed loop [16].…”

Section: Characterisation Methodsmentioning

confidence: 99%

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Assessing the integrity of CFRPs through nanomechanical mapping: the effect of CF surface modification

2018

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Abstract. The purpose of this study is to assess the effect of CF surface modification in enhancement of the wetting properties of carbon fibers in order to improve the adhesion force between the fiber and the polymer matrix; for this, the integrity of CFRPs through nanomechanical mapping was evaluated. The surface of commercial carbon fibers was functionalized through cyclic voltammetry in aqueous electrolyte solutions of H2SO4, in the presence of acrylic acid, methacrylic acid, acrylonitrile and Nvinylpyrrolidone monomers. The produced surface modified carbon fibers were embedded in epoxy resin. Elastic modulus nanoindentation mapping was performed in order for elastic modulus to be calculated, as a qualitative assessment of fibre -matrix interaction. For this, a grid protocol was set up for the integrity assessment of CFRPs through nanomechanical mapping.

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Section: Characterisation Methodsmentioning

confidence: 99%

Section: Characterisation Methodsmentioning

confidence: 99%

Assessing the integrity of CFRPs through nanomechanical mapping: the effect of CF surface modification

2018

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“…Resistance to applied load is a synergistic phenomenon of increasing stiffness and lubrication [50] (facilitation of fibres network movement under compression) due to pyrolysis process. In Figure 12, the maximum displacement of the carbon fibres at 400 is highest when compared to CF-600 and CF-800, for identical applied load.…”

Section: Nanoindentationmentioning

confidence: 99%

Towards green carbon fibre manufacturing from waste cotton: a microstructural and physical property investigation

et al. 2017

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Abstract. The work presents the usefulness of cotton fibre waste as a source of carbon fibre (CF) by pyrolysis. Different pyrolysis temperatures were studied to assess the surface and structural changes during carbonisation. The structural and surface modification of fibres during carbonisation was studied by thermogravimetric analysis (TGA), Field Emission Scanning Electron Microscopy (FESEM), and Raman spectroscopy. Lowpressure plasma employed for surface functionalization treatment in presence of oxygen was conducted. The surface modification was analysed and compared by X-ray Photoelectron Spectroscopy (XPS) and contact angle analysis. Carbon fibre structural strength was studied using nanoindentation. The carbon fibres before and after functionalization revealed a significant change in surface hydrophilicity. In nanoindentation, the maximum displacement of carbon fibre produced at 400°C is higher when compared to treatment of 600°C and 800°C, for identical applied load, revealing lower resistance to applied load, while the carbon fibre produced at 600°C has the least displacement, i.e. higher resistance to applied load. Enhancement of material strength (through resistance to applied load) after surface functionalization is evidenced for the case of carbon fibre produced at 400°C and no effect for carbon fibre (both plain and functionalized) produced at 800°C.

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“…An important issue of nanoindentation measurements is that the material around the contact area tends to (plastically) deform upwards (so-called pile-up) or downwards (so-called sink-in) with respect to the indented surface region. The appearance of such piled-up and sinked-in areas is usually interpreted in terms of the strain-hardening behavior of the indented material [27][28][29][30]. Identification and quantification of the deformation zone around a nanoindentation imprint is of major importance as the shape of the out-of-plane displacement zone is the actual contact area between the tip and the sample.…”

Section: Carbon Nanotube/polyvinyl Butyral Composites (Pvbc)mentioning

confidence: 99%

Lubricity Assessment, Wear and Friction of CNT-Based Structures in Nanoscale

Koumoulos

Charitidis

2017

Lubricants

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Abstract:In this work, three case studies are reported, namely carbon nanotube/polyvinyl butyral composites, MWCNTs/polydimethylsiloxane-based coatings and vertically aligned CNT forest array, of which the friction and resistance to wear/deformation were assessed through nanoindentation/nanoscratch. Additional deformation parameters and findings are also addressed and discussed; namely, material deformation upwards (pile-up) or downwards (sink-in) with respect to the indented surface plane, hardness to modulus ratio (index of resistance to wear) and coefficient of friction. The enhancement of the scratch resistance due to the incorporation of CNTs in a polymer matrix is investigated. For the case of the forest structure, sliding between neighboring nanotubes is identified, while, through ploughing of the tip, local deformation and the extent of plasticity are also addressed.

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Evaluation of surface properties of epoxy–nanodiamonds composites

Cited by 52 publications

References 63 publications

Assessing the integrity of CFRPs through nanomechanical mapping: the effect of CF surface modification

Assessing the integrity of CFRPs through nanomechanical mapping: the effect of CF surface modification

Towards green carbon fibre manufacturing from waste cotton: a microstructural and physical property investigation

Lubricity Assessment, Wear and Friction of CNT-Based Structures in Nanoscale

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