超冷却水滴の接点における塩の濃縮と動態
Victor Kwan1, Shoubhik R Maiti1,2, Ivan Saika-Voivod3
1Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada.
Journal of the American Chemical Society
|June 17, 2022
まとめ
NaClイオンの相互変換反応を表面に誘導する. この表面塩の濃度の上昇は,質量スペクトロメトリーにおける塩の除去の可能性を提供します.
科学分野:
- 物理化学
- 化学物理学
- コンピュータ化学
背景:
- 寒いドロップレットにおけるNaClイオンペアの相互変換 (コンタクトイオンペア,溶媒分離イオンペア,フリーイオン) を調査することは極めて重要です.
- 低温でイオンの振る舞いを理解することは 様々な化学的過程の鍵です
研究 の 目的:
- 寒いドロップレットにおけるNaClイオン相互変換のダイナミクスの直接的な計算的証拠を提供する.
- 温度がイオンペアリングとドロップレット内の分布に与える影響を調査する.
主な方法:
- 冷たいドロップルのイオン相互変換反応をシミュレートするために計算モデルを使用します.
- 反応の動態,イオン対の安定性,拡散係数を分析する.
主要な成果:
- 温度が下がるにつれてイオン相互変換反応はドロップレット表面に近づく.
- 超冷却ドロップルは,地下塩の濃度が高いことを示している.
- 溶媒分離イオンペア (SSIP) は,表面近くのコンタクトイオンペア (CIP) よりも安定する.
- 水の自己拡散は,散布溶液と比較して少なくとも数量で増加します.
結論:
- 低温は表面のイオン濃度を増大させる.
- この現象は,ネイティブ質量スペクトロメトリのイオン化で塩の除去に活用できます.
- この発見は,閉じ込められた冷たい環境におけるイオン溶解とダイナミクスに関する新しい洞察を提供します.
さらに関連する動画
08:16Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
Published on: March 13, 2017
14.0K
06:31Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
Published on: March 18, 2020
6.4K
関連する概念動画
Solution Equilibrium and Saturation
19.3K
Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
19.3K
Colloidal precipitates
739
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
739
Entropy and Solvation
7.2K
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...
7.2K
Solubility Equilibria: Overview
814
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
Solubility is important in biological and environmental processes. A notable...
814
Precipitation Processes
580
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
580
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
429
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
429
