A PLZT Novel Sensor with Pt Implanted for Biomedical Application: Cardiac Micropulses Detection on Human Skin

González-Morán, C. O.; Miranda-Hernández, José G.; Flores-Cuautle, J. J. A.; Suaste-Gómez, Ernesto; Herrera-Hernández, H.

doi:10.1155/2017/2054940

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…The low K IC values indicate that the synthesized materials are very brittle and sensitive to mechanical flaws. Similarly, low fracture toughness values, determined by the Vickers indentation technique, have been reported in hydroxyapatite ceramics and PLZT sensor materials [39,40]. The sample sintered at 1500°C has slightly lower fracture toughness values than the sample sintered at 1450°C, which indicates that the denser material is even more brittle than the porous one.…”

Section: Density and Mechanical Propertiessupporting

confidence: 52%

REFRACTORY CERAMICS SYNTHESIS BY SOLID-STATE REACTION BETWEEN CaCO₃ (MOLLUSK SHELL) AND Al₂O₃ POWDERS

Hernández¹,

Ortega-Avilès²,

Herrera-Hernández³

et al. 2018

Ceramics - Silikaty

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Calcium aluminate-based refractory ceramic was developed as an innovative refractory material, using garden snail (Helix aspersa) shells as a natural source of CaCO 3. A 1:1 molar ratio mixture of CaCO 3 from snail shells and commercial Al 2 O 3 powder was prepared by means of high-energy mechanical milling. The mixed powder was compacted in cylindrical samples (disks) and consolidated by sintering at 1450°C and 1500°C for 1h. The density and porosity were evaluated using the Archimedes principle, while the mechanical properties (hardness, fracture toughness, and shear modulus) were determined by indentation and ultrasonic methods, respectively. The thermal shock resistance was tested by heating samples to temperatures between 900 and 1400°C and subsequent quenching in water at room temperature. X-ray diffraction patterns of sintered samples indicate the formation of different calcium aluminate phases, such as CaAl 12 O 19 (krotite/monoclinic), CaAl 4 O 7 (grossite/monoclinic) and CaAl 2 O 4 (hibonite-5H/hexagonal). The fracture toughness and shear modulus values of materials sintered at 1450°C were higher (0.48 MPa•m 1/2 and 59 GPa, respectively) than those of materials sintered at 1500°C (0.43 MPa•m 1/2 and 55 GPa, respectively). Also changes in the bulk density, hardness and thermal shock resistance values were observed in materials sintered at 1450°C and 1500°C.

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Section: Density and Mechanical Propertiessupporting

confidence: 52%

REFRACTORY CERAMICS SYNTHESIS BY SOLID-STATE REACTION BETWEEN CaCO₃ (MOLLUSK SHELL) AND Al₂O₃ POWDERS

Hernández¹,

Ortega-Avilès²,

Herrera-Hernández³

et al. 2018

Ceramics - Silikaty

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“…The practical cases discussed here are part of the research experienced by Dr. Héctor Herrera Hernández known in the scientific community as DR.3H. Recently, DR.3H and his students & research group are dedicated to their experience in electrochemical impedance knowledge in medical applications as bone replacement or PVDF-based membranes as an appropriate scaffold for skin cell growth [35].…”

Section: àmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy (EIS): A Review Study of Basic Aspects of the Corrosion Mechanism Applied to Steels

Hernández¹,

Reynoso²,

Gonzalez³

et al. 2020

Electrochemical Impedance Spectroscopy

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AC impedance measurements have been applied for over twenty years in electrochemistry and physics to investigate the electrical properties of conductive materials and their interfaces using an external electrical impulse (VOLTAGE, V or CURRENT, I) as driving force. Furthermore, its application has recently appeared to be destined in the Biotechnology field as an effective tool for rapid microbiologic diagnosis of living organism in situ. However, there is no doubt that the electrochemical impedance spectroscopy (EIS) is still one of the most useful techniques around the world for metal corrosion control and its monitoring. Corrosion has long been recognized as one of the most expensive stumbling blocks that concern many industries and government agencies, because it is a steel destructive phenomenon that occurs due to the chemical interaction with aqueous environments and takes place at the interface between metal and electrolyte producing an electrical charge transfer or ion diffusion process. Consequently, it is experimentally possible to determine through the EIS technique the mechanism and control that kinectics of corrosion reactions encounter. First, EIS data is collected through a potentiostat/galvanostat apparatus. After, it is fitted to a mathematical model (i.e. an equivalent electrical circuit, EEC) for its interpretation and analysis, fundamentally seeking a meaningful physical interpretation. Finally, this review reports some basic aspects of the corrosion mechanism applied to steels through the experimental EIS response using Nyquist or Bode plots. Examples are given for different applied electrochemical impedance cases in which steel is under study intentionally exposed to a corrosive aqueous solution by applying a sinusoidal potential at various test conditions.

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“…Considering the temperature effect during the synthesis process (Miranda Hernández et al, 2018), it was found that the calcium aluminate material synthesized by an in-situ solid state reaction between Al 2 O 3 and CaCO 3 obtained from snail shells is feasible, but the results show that this material is brittle. However, there are several investigations showing that the incorporation of metallic or ceramic particles into the matrix of the ceramic materials modified their physical properties and mechanical properties, such as hardness, fracture toughness, elastic modulus, and fatigue strength (Naga et al, 2019;Tahaa et al, 2017;Granados et al, 2017;José et al, 2016;Sergejev and Antonov, 2006;Moradkhani et al, 2013;Pramanick, 2015;González-Morán et al, 2017;Shukla et al, 2010;Dapievea et al, 2018). In other works, the effect of silver particles with calcium aluminate was studied and it was found that with silver particles, calcium aluminate has favorable conditions as an endodontic sealer, that presents improved antibiofilm properties with a positive effect on antimicrobial behavior (Almeida et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Physical, mechanical properties and antimicrobial analysis of a novel CaO·Al2O3 compound reinforced with Al or Ag particles

Saravia

Rastelli

Ortega-Avilés

et al. 2019

Journal of the Mechanical Behavior of Biomedical Materials

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Ceramic-metal (CaO•Al 2 O 3-Al and CaO•Al 2 O 3-Ag) compounds were prepared by mechanical milling and consolidated through an in-situ sintering process. The aim of this work is to study the effects of the Al and Ag particles to ceramic-base compound, primarily in the microstructure, and its mechanical and antimicrobial properties. Chemical systems with a 1:1 M ratio between CaCO 3 and Al 2 O 3 powder were formed, with the addition of 10 wt% Al or 10 wt% Ag, respectively. The compound material that consolidated were microstructurally characterized through X-ray diffraction, scanning electron microscopy, optic microscopy, and X-ray computed tomography. In addition, the hardness, the fracture toughness, the transversal elastic modulus, and the antimicrobial property were evaluated. The results of X-ray diffraction identified the formation of the calcium aluminate phases, such as CaO•6Al 2 O 3 (hibonite:CA6), CaO•2Al 2 O 3 (grossite:CA2), and CaO•Al 2 O 3 (krotite:CA); as well as Al and Ag were identified in its respective system. In addition, the mechanical properties show changes compared to the reference material that was synthesized under the same conditions and, finally, these materials also have an antimicrobial effect, against the Staphylococcus bacterium that is common in the oral cavity, when studied in synthetic saliva.

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A PLZT Novel Sensor with Pt Implanted for Biomedical Application: Cardiac Micropulses Detection on Human Skin

Cited by 3 publications

References 17 publications

REFRACTORY CERAMICS SYNTHESIS BY SOLID-STATE REACTION BETWEEN CaCO₃ (MOLLUSK SHELL) AND Al₂O₃ POWDERS

REFRACTORY CERAMICS SYNTHESIS BY SOLID-STATE REACTION BETWEEN CaCO₃ (MOLLUSK SHELL) AND Al₂O₃ POWDERS

Electrochemical Impedance Spectroscopy (EIS): A Review Study of Basic Aspects of the Corrosion Mechanism Applied to Steels

Physical, mechanical properties and antimicrobial analysis of a novel CaO·Al2O3 compound reinforced with Al or Ag particles

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