Study of the surface properties of the epoxy/quasicrystal composite

Barros, Thayza Pacheco dos Santos; Cavalcante, Danielle Guedes de Lima; Oliveira, Danniel Ferreira de; Caluête, Rafael Evaristo; Lima, Severino Jackson Guedes de

doi:10.1016/j.jmrt.2018.04.015

Cited by 18 publications

(7 citation statements)

References 5 publications

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“…Below 10-12 nm of oxide thickness, it has been shown to vary in inverse proportion to the thickness of the oxide [13], suggesting a coupling between the electronic distribution on the liquid molecules (e.g., the electric dipole of the water molecule) on the one hand and the topology of the quasicrystal's Fermi surface on the other [15]. The same trend was observed with water deposited on Al-based quasicrystalline coatings [16][17][18][19] and films [20], with quasicrystal-reinforced composites [21], and even with liquid metals on Al-Co approximants [22].…”

Section: Introductionmentioning

confidence: 66%

Impact of Tuned Oxidation on the Surface Energy of Sintered Samples Produced from Atomised B-Doped Al-Cu-Fe Quasicrystalline Powders

et al. 2023

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Super-hydrophobic surfaces and coatings have stimulated a great deal of research, with the aim being to achieve better wetting properties. Factors such as surface chemistry and roughness play an important role in changing the surface energy, which in turn leads to changes in the wettability. Here, we have analysed the time dependence of the oxide layer and possible surface adsorbates on the surface topography of an Al59Cu25Fe13B3 quasicrystalline material in relation to changes in the wettability. The quasicrystalline matrix phase was 94% of the sample volume, and it was covered by a very smooth, amorphous oxide layer. The AlB12 and AlFe2B2 boron-rich phases were embedded in the quasicrystalline material as a result of the 3 at.% boron addition, which made atomisation of the material a simpler process. Under ambient conditions, the sample was naturally covered by an oxide layer; therefore, it is referred to as “surfenergy” to distinguish it from the conventional surface energy of a bare quasicrystal surface. The growth of the oxide layer with atmospheric ageing and annealing at 500 °C in air for various times was investigated for both cases. The phase most prone to oxidation was the boron-rich AlFe2B2, which influenced the topography of the surface and accordingly the wetting behaviour of the specimen. We demonstrated that the surfenergy depends on the polar component, which is the most sensitive to the operating conditions. A correlation between the surfenergy components and the surface roughness was found. In addition, theoretical models to determine the wettability were included.

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Section: Introductionmentioning

confidence: 66%

Impact of Tuned Oxidation on the Surface Energy of Sintered Samples Produced from Atomised B-Doped Al-Cu-Fe Quasicrystalline Powders

et al. 2023

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“…An alternative strategy to address this limitation is by using quasicrystals as reinforcing powder within the polymer matrix, where mechanical, tribological, and thermal properties were improved. Examples are epoxy resin [17][18][19], polyphenylene sulphide [20] and nylon polymer [21]. The most prominent QC-polymer composite was obtained by using the additive-manufacturing technique of selective laser sintering [21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Al-Cu-Fe Quasicrystal Particles on the Reinforcement of a Polymer–Matrix Composite: From Surface to Mechanical Properties

Kušter,

Samardžija,

Komelj

et al. 2024

Crystals

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We examined the effect of Al59Cu25Fe13B3 (at.%) quasicrystalline (QC) reinforcement particles on the mechanical and surface properties of a polymer-matrix composite by applying a technical polymer polyphthalamide (PPA). The observed increase in the tensile Young’s modulus ranged from 1810 MPa for the pure polymer to 4114 MPa for the composite with a QC filling of 35 vol.%. The elongation at fracture decreased with the filling fraction, being equal to 16.9% for a pure polymer and dropping to 4.8% for the composite with a QC filling of 35 vol.%. The same trend was noticeable with flexural Young’s modulus, which ranged from 100 MPa for a pure polymer to 125.5 MPa for the composite with 35 vol.% of QC. It was found that the increase in the mechanical strength led to a simultaneous increase of brittleness, which was reflected in a decrease of the impact strength for a pure polymer from 98.5 kJ/m2 to 42.4 kJ/m2 for composites with a QC filling of 35 vol.%. In contrast, when filled with 5 vol.% of QC, the impact strength increased by 8%. The friction coefficient against 100C6 steel dropped from 0.15 for pure PPA down to 0.10 for 5 vol.% of the QC filling, followed by an increase to 0.26 for further QC fillings up to 35 vol.%. Interestingly, a local minimum of friction was achieved at filling factors between 5 to 20 vol.% of QC. Independently, a clear surfenergy minimum was also found for the composite material with 20 vol.% of QC filling associated with a net drop in the polar component of the surfenergy. Surfenergy refers to the surface energy related to the top of the oxide layer under ambient conditions. We hypothesise that this is related to the percolation threshold at about 13 vol.% QC, reflected in the observed behaviour of both the friction coefficient and surfenergy. For the pure QC annealed in air for 1 h at 500 °C significant wear tracks were observed accompanied by a wear debris formation. On the other hand, a pure polymer exhibited slightly visible wear tracks with no apparent debris formation, and for the composites with different QC filling factors, the wear traces were barely visible with negligible debris formation.

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“…Little is known about the interaction and modification of the crystallinity of polymeric materials using recycled quasicrystalline fillers, in order to change their semiconductor properties, however, it is known that there is a lower energy consumption and lower gas emission in the recycling process of the materials used in the alloy, encouraging sustainability and without altering the alloy properties. Furthermore, these quasicrystalline alloys, when used as fillers in polymeric matrices, reduce the hydrophilic percentage of the polymers, a behavior that does not happen with fillers of ceramic materials [14,15].…”

Section: Introductionmentioning

confidence: 99%

Development and surface properties of polyamide 6 and quasicrystal composite coatings recycled via spin coating technique

Sousa

Silva

Fernandes

et al. 2022

Mater. Res. Express

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In search to meet technological demands, material studies as well as techniques to process them have been increasing worldwide, thus seeking to unite lower processing costs, the best properties of the materials involved, reuse of resources and more sustainable means. Thus, the development of new materials, coatings and composites have stood out in the market. For this work, we fetch the development and characterization of polyamide 6 composite coatings with quasicrystalline AlCuFe fillers, recycled through the spin coating technique, since that little is known about the interaction between these two materials, which have excellent isolating properties, and little is observed about the use of this technique to produce coatings with metallic loads. The recycled AlCuFe quasicrystalline alloy was manufactured by conventional induction casting. Polyamide 6 coatings with quasicrystalline particles were developed with additions of 0, 1, 3 and 5 (% vol.) quasicrystal, via SpinCoating technique. Thermogravimetric analyses (TG), differential scanning calorimetry (CSD), average roughness (RA), contact angle, surface energy and scanning electron microscopy (SEM) were performed to characterize this material. Being observed an increase in the thermal stability of the composite, reduction in average roughness (Ra) and surface energy values, with increase in quasicrystal fraction in the polymer matrix. In addition to hydrophobicity and oleophilic character of the samples with the addition of quasicrystalline loads. It can be concluded, in general, that the Spin Coating technique is effective in the production of polyamide composite coatings 6 with recycled quasicrystals, presenting interesting surface properties with potential for further studies in innovative applications, such as semiconductors and surface coatings.

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Study of the surface properties of the epoxy/quasicrystal composite

Cited by 18 publications

References 5 publications

Impact of Tuned Oxidation on the Surface Energy of Sintered Samples Produced from Atomised B-Doped Al-Cu-Fe Quasicrystalline Powders

Impact of Tuned Oxidation on the Surface Energy of Sintered Samples Produced from Atomised B-Doped Al-Cu-Fe Quasicrystalline Powders

Effect of Al-Cu-Fe Quasicrystal Particles on the Reinforcement of a Polymer–Matrix Composite: From Surface to Mechanical Properties

Development and surface properties of polyamide 6 and quasicrystal composite coatings recycled via spin coating technique

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