Electrochemical characterization of cement/graphite and cement/aluminium materials

Peinado, F.; Roig, A.; Vicente, F.; Vilaplana, Josep Lluís; López‐Martínez, Juan

doi:10.1007/bf00592624

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Composite materials consisting of an isolator phase filled with a conductive powder are of special interest and have a wide range of particular uses [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. When the filler content increases, the particles form inner structural clusters in the polymeric matrix.…”

Section: Introductionmentioning

confidence: 99%

A Macroscopic Interpretation of the Correlation between Electrical Percolation and Mechanical Properties of Poly-(Ethylene Vinyl Acetate)/Zn Composites

Agrisuelas,

Balart,

García-Jareño

et al. 2024

Materials

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Elastic composites were prepared using a procedure involving hot plates and zinc powder that was directly dispersed into an EVA matrix. The correlation between the zinc content and the conductive properties of the material was studied via impedance spectroscopy, the thermal properties of the material were studied via differential calorimetry and the mechanical properties of the composites were studied via tensile strength curves, representing an important advancement in the characterization of this type of composite material. The composites’ tensile strength and elongation at break decrease with the addition of filler since zinc particles act as stress-concentrating centres, while the composites’ hardness and Young’s modulus increase because of an increase in the stiffness of the material. The AC perturbation across the EVA/Zn composites was characterized using an RC parallel equivalent circuit that allowed us to easily measure their resistivity (ρp) and permittivity (εp). The dependence of these electrical magnitudes on the zinc content is correlated with their mechanical properties across the characteristic time constant τp = ρp·εp of this equivalent circuit. The dependence of the mechanical and electrical magnitudes on the zinc content is consistent with the formation of percolation clusters. The addition of graphite particles increases their potential performance. Three possible mechanisms for the electrical transport of the ac-perturbation across the EVA/Zn composites have been identified. Chemical corrosion in acid media causes the loss of zinc surface particles, but their bulk physical properties practically remain constant.

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Section: Introductionmentioning

confidence: 99%

A Macroscopic Interpretation of the Correlation between Electrical Percolation and Mechanical Properties of Poly-(Ethylene Vinyl Acetate)/Zn Composites

Agrisuelas,

Balart,

García-Jareño

et al. 2024

Materials

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“…Graphite powder has a layered planar structure, rendering it relatively soft due to its anisotropy and weak inter-planar forces, ability to conduct electricity and heat well, resistance to chemical attack, and stability under standard conditions [ 8 , 14 ]. Graphite has been used as a conductive filler in some studies, and it was found that it could improve the electrical conductivity performance [ 15 , 16 , 17 , 18 ]. However, graphite size can vary, and very often, this property is not reported, while at the same time, the percolation threshold could depend on the size of the conductive additive.…”

Section: Introductionmentioning

confidence: 99%

“…However, graphite size can vary, and very often, this property is not reported, while at the same time, the percolation threshold could depend on the size of the conductive additive. In one study, it was found that when graphite was added in cement, the composite became a conductor; however, the mechanical and electrical properties depended on the water content and the setting process [ 15 ]. When dry-mixing graphite and cement powder, a minimum threshold of 2 wt % graphite was needed, below which the insulating cement prohibited the formation of conductive graphite pathways and the conductivity leveled off at around 10 wt % graphite [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Natural Graphite Fineness on the Performance and Electrical Conductivity of Cement Paste Mixes for Self-Sensing Structures

et al. 2020

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Cementitious composites are the most widely used construction materials; however, their poor durability necessitates frequent monitoring and repairs. The emergence of self-sensing composites could reduce the need for costly and time-consuming structural inspections. Natural graphite, due to its low cost and wide availability, is a promising additive to generate an electrically conductive network which could ultimately lead to a self-sensing mechanism. Despite several studies using natural graphite as a conductive additive, the effect of its fineness on the cementitious composite’s performance has not been explored. This study experimentally investigated the effect of three graphite products of varying fineness on the early age, mechanical, and electrical conductivity performance of cement pastes. The fluidity of the graphite-cement paste reduced significantly with increasing graphite fineness, and graphite did not affect the cement hydration. The finer the graphite, the lower the effect on the mechanical performance, as confirmed by compressive strength testing and micro-indentation. Electrical conductivity testing showed that the percolation threshold depended on the graphite fineness and was found at ~20 wt % for the fine and medium graphite, while it increased to 30–40 wt % for the coarse graphite. This is the first study that has investigated holistically the effect of graphite fineness on the performance of cement pastes and will pave the way for using this material as an additive for self-sensing structures.

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“…dispersed in an insulating polymeric matrix. With an appropriate percentage of conductive powders, they have shown a good electrical conductivity and a highly developed electro-active surface [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Also, a high ionic conductivity is required to allow the electrolyte to penetrate inside the porous network [41,42].…”

Section: Introductionmentioning

confidence: 99%

Voltammetric Characterization of Nickel Hydroxide Grown on Nickel/Epoxy Moldable Electrodes

et al. 2017

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Nickel/epoxy composites have been fabricated by dispersing nickel powder in a polymeric matrix of epoxy resin. Nickel hydroxide, Ni(OH) 2 , was deposited on such nickel/epoxy surfaces by means of successive voltammetric cycles and galvanostatic reduction. Likewise, the same hydroxide was grown on polycrystalline nickel surfaces. The responses of such electrochemical systems was studied in KOH (aq) at several concentrations as well as in saturated Ca(OH) 2(aq) . Ni(OH) 2 grown on nickel/epoxy surfaces exhibited different potentiodynamic i-E profile and cathodic charges, which are largely affected by nickel/epoxy ratio, potential sweep rate and solution pH. The oxygen evolution on these types of electrodes is consistent with α-Ni(OH) 2 structure obtained by means of the voltammetric method.

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Electrochemical characterization of cement/graphite and cement/aluminium materials

Cited by 8 publications

References 13 publications

A Macroscopic Interpretation of the Correlation between Electrical Percolation and Mechanical Properties of Poly-(Ethylene Vinyl Acetate)/Zn Composites

A Macroscopic Interpretation of the Correlation between Electrical Percolation and Mechanical Properties of Poly-(Ethylene Vinyl Acetate)/Zn Composites

Effect of Natural Graphite Fineness on the Performance and Electrical Conductivity of Cement Paste Mixes for Self-Sensing Structures

Voltammetric Characterization of Nickel Hydroxide Grown on Nickel/Epoxy Moldable Electrodes

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