Considerations on electrical impedance measurements of electrolyte solutions in a four-electrode cell

Chaparro, Cinthia V.; Herrera, Lyda V.; Meléndez, Ángel M.; Miranda, David A.

doi:10.1088/1742-6596/687/1/012101

Cited by 14 publications

(14 citation statements)

References 4 publications

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“…5.5×10 -5 mS cm -1 ) and PBS (ca. 3 mS cm -1 ) [17], [76]. The ionic conductivity of ILs was found to be in a large range between 1 and 30 mS cm -1 [32], [77].…”

Section: F Summary Of Electrolytesmentioning

confidence: 91%

Electrolyte-Gated Field Effect Transistors in Biological Sensing: A Survey of Electrolytes

Wang

Lian

Chu

2021

IEEE J. Electron Devices Soc.

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Low operating voltages, rapid response, and high-throughput fabrication compatibility are key advantages for the development of electrolyte-gated field effect transistors (EGFETs) for biological sensing. Among the key components in EGFET biosensors, electrolyte materials are relatively less investigated, especially alternatives to water-based liquid electrolytes such as ionic liquids, ion gels, polyelectrolytes, and solid polymer electrolytes. These electrolytes enable portable devices and environmental stability superior to their water-based liquid alternatives. In this review, we offer an up-to-date evaluation of the state of EGFET research and gauge the strengths and limitations of high-performance electrolytes for use in EGFET biosensor applications as well as the potential for computer-aided design of such sensing platforms. The recent progress of EGFET biosensors for some popular analytes are reviewed and the performance of these alternative electrolytes in transistor biosensing is assessed. The challenges and opportunities for electrolytes in EGFETs are discussed for future research directions in this field.

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“…5.5×10 -5 mS cm -1 ) and PBS (ca. 3 mS cm -1 ) [17], [76]. The ionic conductivity of ILs was found to be in a large range between 1 and 30 mS cm -1 [32], [77].…”

Section: F Summary Of Electrolytesmentioning

confidence: 91%

Electrolyte-Gated Field Effect Transistors in Biological Sensing: A Survey of Electrolytes

Wang

Lian

Chu

2021

IEEE J. Electron Devices Soc.

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“…Infinite electrolyte was assigned in this study and the coating layers were assumed to be homogenous. The modeling and the simulation were performed based on the Butler‐Volmer kinetics considering the curcumin conductivity (10 × 10 −3 S/cm), 1 electrolyte PBS conductivity (0.115 S/cm), 36 Fe and Zn exchange current density and standard potential of Fe and Zn as the electrodes at 25°C (−0.44 and − 0.76 V vs. standard hydrogen electrode, respectively) 37 . The overall electrochemical reaction was considered as an activation‐controlled process.…”

Section: Methodsmentioning

confidence: 99%

Degradation‐triggered release from biodegradable metallic surfaces

et al. 2021

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This work is dedicated to the investigation of drug‐release control by a direct effect of degradation from biodegradable metallic surfaces. Degradation behaviors characterized by surface morphology, immersion, and electrochemical techniques demonstrated that curcumin‐coated zinc (c‐Zn) had a higher degradation rate compared to curcumin‐coated Fe (c‐Fe). High anodic dissolution rate due to the higher degradation rate and widely extended groove‐like degradation structure of c‐Zn propelled a higher curcumin release. On the other hand, a slower curcumin release rate shown by c‐Fe scaffolds is ascribed to its lower anodic dissolution and to its pitting degradation regime with relatively smaller pits. These findings illuminate the remarkable advantage of different degradation behaviors of degradable metallic surfaces in directly controlling the drug release without the need for external electrical stimulus.

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“…The first setup is well reported in the literature (Chaparro, et al, 2016). The second setup was proposed for studying the AC effect of induced polarization due to the excitation signal.…”

Section: Ac Electrical Measurementsmentioning

confidence: 99%

“…Thus, HeLa cells suspended in phosphate buffer solution (PBS medium) can be studied with this method. One of the advantages of this type of measurement is the diminution of the polarization effects because the excitation is supplied by two electrodes while the voltage is measured by the other two (Chaparro, et al, 2016). However, the electric field produced by the excitation signal generates a rearrangement of charges at the electrode/electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

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Limpieza de electrodos y reproducibilidad de medidas de impedancia eléctrica en células HeLa en solución acuosa

Pinto

Pinzón

Meléndez

et al. 2020

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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La espectroscopia de impedancia eléctrica (EIS) se emplea en el estudio de las propiedades eléctricas de células en suspensión. Para medir las propiedades eléctricas de materiales se utilizan dos (sistema de electrodo bipolar), tres (tripolares) y cuatro (tetrapolares) electrodos, siendo las medidas tetrapolares la mejor opción para minimizar los efectos de polarización de electrodo. Cuando se repiten las medidas de EIS en una misma muestra, se espera obtener espectros similares, sin embargo, en algunas situaciones se encuentran diferencias significativas asociadas con la baja reproducibilidad y repetibilidad. Aquí se utilizaron células HeLa dispersas en solución acuosa para evaluar también el efecto de la limpieza en el funcionamiento de los electrodos de oro. La limpieza de las superficies de los electrodos de oro se hizo por voltamperometría cíclica. Se encontró que la reproducibilidad y la repetibilidad de las medidas de impedancia aumentaba al limpiar los electrodos. Estos resultados evidenciaron que la limpieza de la superficie de los electrodos minimizó las contribuciones de la polarización de los electrodos en las mediciones. Además, se propone un modelo de circuito para describir el efecto de las superficies sin limpiar en las medidas eléctricas. Dicho modelo confirma que el efecto observado no se debió a una impedancia de polarización convencional. Más bien se trató de una polarización activa (como un potencial), la cual se presenta a bajas frecuencias y es independiente de la frecuencia de la señal de excitación.

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Considerations on electrical impedance measurements of electrolyte solutions in a four-electrode cell

Cited by 14 publications

References 4 publications

Electrolyte-Gated Field Effect Transistors in Biological Sensing: A Survey of Electrolytes

Electrolyte-Gated Field Effect Transistors in Biological Sensing: A Survey of Electrolytes

Degradation‐triggered release from biodegradable metallic surfaces

Limpieza de electrodos y reproducibilidad de medidas de impedancia eléctrica en células HeLa en solución acuosa

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