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関連する概念動画

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Flame Photometry: Lab01:16

Flame Photometry: Lab

In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...

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水性ルミノール溶液における単一泡のソノケミユミネセンスは,

Shin-Ichi Hatanaka1, Hideto Mitome, Kyuichi Yasui

  • 1Department of Applied Physics and Chemistry, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan. hatanaka@pc.uec.ac.jp

Journal of the American Chemical Society
|August 29, 2002
PubMed
まとめ

Sonochemiluminescence (SCL) は不安定なバブル崩壊を必要とし,安定したSoluminescence (SL) は必要ではない. 小さな泡の成長と放出によって特徴づけられるダンシング・バブルは,有意なSLがない場合でも,SCLを観察する上で鍵となるものです.

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関連する実験動画

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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
14:22

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科学分野:

  • 物理化学 物理化学
  • アコースティクス アコースティクス
  • 発光する光度 (luminescence)

背景:

  • ソノルミネッセンス (SL) は,超音波で液体内の泡の崩壊から発する光の放射です.
  • Sonochemiluminescence (SCL) は,音響カビテーションによって引き起こされる化学反応からの光放出を含みます.
  • SCLの条件を理解することは,音響化学や材料科学の応用において極めて重要です.

研究 の 目的:

  • バブルダイナミクスとルミノール・ソノケミユミネセンスの発生 (SCL) の間の関係を調査する.
  • 単一の,音響的に駆動されたバブルからSCL排出に影響を与える重要な要因を決定する.
  • SCLを好む条件と,高強度SLを好む条件を区別する.

主な方法:

  • 音響カビテーション下にある単一のバブルからの光放射のスペクトル測定.
  • バブルの安定性とダイナミクスの制御された操作, "踊る"バブルの行動を誘発することなど.
  • 溶けたガスの含有量を変化させ,泡の行動と発光に与える影響を観察する.

主要な成果:

  • 高強度音色発光 (SL) を発する安定した単一バブルはSCLを発生させませんでした.
  • 不安定な"踊る"バブルが成長し,より小さなバブルを放出すると,ソノケミユミネスセント (SCL) が観察されました.
  • SCLは,SLが存在しない場合でも,溶けたガス含有量に応じて,踊る泡から検出されました.

結論:

  • バブル崩壊の不安定性は,ソノケミユミネッセンス (SCL) を観察するための主要な決定要因です.
  • 不安定性を示す"踊る"バブル現象は,SCLの発生に不可欠です.
  • 溶けたガスの含有量は,バブルダイナミクスとSCL排出の可能性に大きな影響を与えます.