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相关概念视频

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

595
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...
595
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

689
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.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
689
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

177
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
177
Potentiometry: Overview01:06

Potentiometry: Overview

2.1K
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
2.1K
Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

1.4K
Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
1.4K
Electrodes: Overview01:17

Electrodes: Overview

1.7K
 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.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
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Iridium Oxide-reduced Graphene Oxide Nanohybrid Thin Film Modified Screen-printed Electrodes as Disposable Electrochemical Paper Microfluidic pH Sensors
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氧化和氧化基于微流体的电位计pH值传感器

Weiyu Xiao1, Qiuchen Dong2

  • 1School of Science, Department of Chemistry, Xi'an Jiaotong-Liverpool University, Ren'Ai Road No. 111, Dushu Lake Higher Education and Innovation District, Suzhou Industrial Park, Suzhou, 215123, People's Republic of China.

Mikrochimica acta
|November 2, 2023
PubMed
概括

这项研究开发了一种新型传感器,用于精确的微升体积pH值测定,这对于生物医学和工业用途至关重要. 新的传感器提供高灵敏度和稳定性,克服了当前pH测量技术的局限性.

关键词:
的氧化 的氧化氧化物 氧化物诺恩斯特常数是一个常数.电位计传感器的电位计传感器.一个pH值传感器.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 分析化学 分析化学

背景情况:

  • 微升体积pH值的确定对于生物医学和工业应用至关重要.
  • 现有的pH计难以达到微体积测量所需的精度,可重复性和稳定性.
  • 需要先进的传感技术,能够进行准确的微体积pH分析.

研究的目的:

  • 开发和描述一种新的电化学传感器,以准确地确定微升体积中的pH值.
  • 为了解决微体积pH传感当前技术的局限性.
  • 为了证明传感器在现实世界生物样本中的适用性.

主要方法:

  • 使用电子沉积的氧化,氧化和金电极制造一个电化学传感器.
  • 使用SEM,TEM,XRD和拉曼光谱等技术对电沉积薄膜进行表征.
  • 使用Nernst常数测定和人血清样本分析来评估传感器的性能.

主要成果:

  • 传感器在10-12μL的体积下实现了Nernst常数55.9 ± 4.4 mV/pH.
  • 鉴定证实了电沉积膜的形态和组成.
  • 该传感器表现出高精度,与商用pH计相比只有0.80%的变化,检测极限为±0.01pH.

结论:

  • 开发的电化学传感器有效地使微升体积的pH值能够精确确定.
  • 传感器表现出卓越的性能,与商业仪器相美,具有高灵敏度和稳定性.
  • 这项技术对未来在各种领域的in situ微体积pH测量具有重大潜力.