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相关概念视频

Ions as Acids and Bases02:54

Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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The Sense of Self: Reflected Self-Appraisal and Social Comparison02:57

The Sense of Self: Reflected Self-Appraisal and Social Comparison

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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

549
Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Quantification and Size-profiling of Extracellular Vesicles Using Tunable Resistive Pulse Sensing
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可调节的离子传感器使用基于库洛米特的协议与允许选择性的纳米膜.

Nuria Martínez-Lorca1, Yujie Liu2, Gregorio Laucirica1

  • 1UCAM-SENS, Universidad Católica San Antonio de Murcia, UCAM HiTech, Avda. Andrés Hernández Ros, 1, Murcia 30107, Spain.

Analytical chemistry
|February 2, 2026
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概括

这项研究介绍了一种全固态离子选择性电极 (ISE),用于离子 (K+) 检测. 度传感器为临床和环境监测中的真实世界样品提供可调和,可逆的响应.

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科学领域:

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

背景情况:

  • 离子选择性电极 (ISE) 对于离子检测至关重要.
  • 全固态ISE在便携性和稳定性方面提供了优势.
  • 度检测提供了对离子转移的定量测量.

研究的目的:

  • 开发和验证一个完全固态的ISE,使用选择性纳米膜进行库洛米检测.
  • 用两个不同的电化学协议 (阳极和阴极) 证明检测离子 (K+).
  • 评估传感器在现实世界样本中的性能及其微流体集成潜力.

主要方法:

  • 使用ITO玻璃基板,聚3-氧乙 (POT) 层和选择性纳米膜制造ISE.
  • 采用线性扫描电压测量和时电压测量来实现正极和阳极电化学协议.
  • 信号集成以量化K + 电荷并确定度的比例性.

主要成果:

  • 在集成电荷和K+度之间证明了直接的比例.
  • 确定了不同的响应范围:3-20μM (阴极) 和200-1000nm (阳极).
  • 通过阴极协议实现了出色的重复性和可逆性;在人类尿液,马血清,运河水和KCl溶液中得到验证.

结论:

  • 开发的coulometric ISE适用于量化K+在各种实体样本中,在纳米度到微分子度之间.
  • 传感器的设计可适应检测其他离子,并集成到微流体装置,以减少样本体积.
  • 该技术在临床诊断和环境监测应用中显示出显著的前景.