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Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Electrodes: Overview01:17

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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
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Potentiometry: Types of Electrodes01:19

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Flexible 3D-Printed EEG Electrodes.

Andrei Velcescu1, Alexander Lindley2, Ciro Cursio3

  • 1School of Electrical and Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK. andrei.velcescu@postgrad.manchester.ac.uk.

Sensors (Basel, Switzerland)
|April 10, 2019
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Summary
This summary is machine-generated.

Researchers developed new flexible 3D-printed electrodes for electroencephalography (EEG) that improve signal quality. These novel electrodes offer better scalp contact and reduced noise for clearer brain activity recordings.

Keywords:
3D printingEEGelectrode

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Traditional electroencephalography (EEG) electrodes face challenges with hair, requiring direct scalp contact.
  • Previous 3D-printed electrodes offered personalization but lacked flexibility.
  • Improvements in electrode materials and design are crucial for enhanced EEG signal acquisition.

Purpose of the Study:

  • To introduce the first flexible 3D-printed EEG electrodes.
  • To evaluate the performance of these novel electrodes with varying mechanical structures and coatings.
  • To demonstrate the feasibility of using these flexible electrodes for on-person EEG recordings.

Main Methods:

  • Utilizing a flexible 3D printing element to create electrodes with three distinct base mechanical structures.
  • Replacing previous silver coatings with silver/silver-chloride coatings to enhance sensing performance.
  • Conducting detailed electro-mechanical testing, including conductivity under compression analysis.
  • Performing on-person tests to record electroencephalography (EEG) signals.

Main Results:

  • The flexible 3D-printed electrodes demonstrated successful EEG signal acquisition.
  • The silver/silver-chloride coating significantly reduced electrode contact impedance and noise.
  • Electro-mechanical testing confirmed stable conductivity under compression, indicating robust performance.
  • The novel design allows for personalized and adaptable electrode configurations.

Conclusions:

  • Flexible 3D-printed electrodes represent a significant advancement in EEG technology.
  • The use of silver/silver-chloride coatings and flexible materials enhances electrode performance and user comfort.
  • These electrodes offer a promising solution for improved, personalized EEG monitoring in various applications.