油と水のインターフェイスで,弱い水素結合を通じた芳香質の自己蓄積
Makoto Kunieda1, Kennichi Nakaoka, Yunfeng Liang
1Department of Urban Management, Kyoto University, Kyoto 615-8540, Japan.
Journal of the American Chemical Society
|December 15, 2010
まとめ
芳香質は,他の炭化水素とは異なり,より低い界面張力により,油と水の界面に蓄積します. この濃度は,芳香環と水分子の間の弱い水素結合によって引き起こされる.
科学分野:
- 物理化学 物理化学
- 化学工学は化学工学というものです.
- マテリアルサイエンス 材料科学
背景:
- アンフィフィリック溶液は,表面活動と接点での蓄積で知られています.
- インターフェースにおける溶質の振る舞いを理解することは,様々な化学的プロセスにおいて極めて重要です.
研究 の 目的:
- 軽油水界面におけるアロマティックおよびその他の炭化水素の界面的振る舞いを調査する.
- 油と水の界面における芳香物質の蓄積の原動力を決定する.
主な方法:
- 石油と水のインターフェースをモデル化するために分子動力シミュレーションを使用しました.
- シミュレーションシステム内の異なる炭化水素タイプの分布を分析した.
主要な成果:
- アロマティック物質は,インターフェイス領域に集中することが観察されました.
- その他の炭化水素は,オイルフェーズ全体で均一な分布を示した.
- アロマティック蓄積は,他の炭化水素と水のインターフェイスと比較して,アロマティックと水のインターフェイスのインターフェイスの緊張が低いことと関連していました.
結論:
- 油と水の界面でのアロマティック物質の自己蓄積は,界面張力差によって引き起こされる.
- アロマティックリングと水プロトンの間の弱い水素結合は,接面の緊張を軽減し,蓄積を促進するメカニズムです.
関連する概念動画
02:05Entropy and Solvation
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ ≥ 15); an...
03:22Colloids
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...
01:25Aromatic Compounds: Overview
In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated benzene...
In 1825, Faraday isolated benzene...
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
02:45Acid-Catalyzed Hydration of Alkenes
Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
03:00Solubility
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...