周波数,功率,水溶性添加物の関数として音響泡の凝結に関する研究
Devi Sunartio1, Muthupandian Ashokkumar, Franz Grieser
1Particulate Fluids Processing Centre, School of Chemistry, University of Melbourne, Melbourne, Victoria 3010, Australia.
Journal of the American Chemical Society
|April 19, 2007
まとめ
硫酸ナトリウムドデシル酸塩 (SDS) のような表面活性溶液は,超音波処理中に泡の凝結を減少させます. 泡の寿命は有限で,超音波の頻度が増加するにつれて減少し,SDSは均衡アドソープションに達しません.
科学分野:
- 物理化学 物理化学
- コロイドと表面科学 コロイドと表面科学
- アコースティクス アコースティクス
背景:
- 表面活性溶液は,液体の泡の振る舞いに影響を与えます.
- 超音波は,バブルダイナミクスに影響を与える音響エネルギーを導入します.
研究 の 目的:
- 超音波による泡の凝結に表面活性溶液の影響を調査する.
- 泡の凝結と寿命に対する音響力と周波数の影響を判定する.
主な方法:
- 泡の凝結を定量化するために,超音波による溶液量変化を測定する.
- 異なる音響条件下でアリファティックアルコールとドデシル硫酸ナトリウム (SDS) を研究する.
主要な成果:
- 表面活性溶液の吸収は一般的に泡の凝結を遅らせます.
- バブル凝結は,音響力に依存しないことを示した.
- 周波数依存は,短距離の反発が優位であったときに観察され,より高い周波数が凝結阻害を軽減しました.
- SDSは,バブル/溶液インターフェイスで平衡アドソープションに達しなかった.
結論:
- 非均衡面の過剰値を推定する方法を提案した.
- マルチバブルフィールドのバブルの寿命は有限であり,音響周波数の増加とともに減少します.
- 推定されるバブル寿命は0.35 ms (213 kHz) から0.10 ms (1062 kHz) の範囲です.
関連する概念動画
Factors Affecting Dissolution: Particle Size and Effective Surface Area
Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...
Coagulation
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Deriving the Speed of Sound in a Liquid
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave propagating...
The speed of sound in fluids can be derived by considering a mechanical wave propagating...
Colloids
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
Sound Waves: Interference
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Physical Properties Affecting Solubility
Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...


