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相关概念视频

pH01:24

pH

121.5K
The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium...
121.5K

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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在空心光学共振器中嵌入的响应pH的水凝.

Médéric Loyez, Maxwell Adolphson, Jie Liao

    Optics express
    |January 29, 2025
    PubMed
    概括

    这项研究展示了一种创新方法,用于在低声画廊模式的微气泡共振器 (MBR) 中创建pH敏感的聚乙烯醇/聚烯酸 (PVA/PAA) 水凝. 这些水凝显示可调节的波长变化,以响应pH值的变化,使灵敏的检测.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 材料科学 材料科学 材料科学
    • 生物医学工程 生物医学工程

    背景情况:

    • 低声画廊模式 (WGM) 微传感器为表面 (生物) 化学传感提供高灵敏度.
    • 现有的WGM应用集中在响应器表面附近的折射率变化上.
    • 监测分子结合事件是生物传感的一个关键应用.

    研究的目的:

    • 为了研究WGM微气泡共振器 (MBR) 中的PVA/PAA水凝的凝化.
    • 为了描述这些水凝的pH依赖性胀行为.
    • 探索使用MBRs调节pH传感的潜力.

    主要方法:

    • 从二氧化毛细血管制造MBR.
    • 在MBR腔内通过受控加热在现场形成PVA/PAA水凝层.
    • 在不同的pH溶液下测试MBR,观察共振条件的变化.
    • 水凝膨胀和WGM波长转移的特征.

    主要成果:

    • 成功地凝结并对MBR内部的PVA/PAA水凝层进行了表征.
    • 在WGM共振中观察到的波长变化与pH值变化成比例.
    • 证明了水凝在不同pH值的反应下具有膨胀能力.

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  • 关于动力学,可逆性和可调节检测能力的初步数据.

    • 结论:

    • 对于传感应用,PVA/PAA水凝可以有效地集成到MBR中.
    • 水凝的pH依赖性胀会导致WGM共振的可测量变化.
    • 该系统对微小的pH值变化进行可调和灵敏的检测非常有希望.