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Solubility03:00

Solubility

17.1K
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,...
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
690
Solvents01:12

Solvents

63.9K
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
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Solvating Effects02:12

Solvating Effects

7.2K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

62.1K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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植物醇和单烯在水性深溶解剂和前离子离子液体溶液中.

Karen J Edler1, Gregory G Warr2, Alexander M Djerdjev2

  • 1Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK. karen.edler@chem.lu.se.

Faraday discussions
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概括

研究人员在新的溶剂中使用植物醇和单烯来探索液晶相,例如离子液体和深度环氧溶剂. 水的添加影响了结构,有利于逆六角相,而特定的离子液体稳定了立方相.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学
  • 生物物理学的生物物理.

背景情况:

  • 植物醇和单烯的热液晶凝是在水中建立的自组装系统,具有多种应用.
  • 水性系统面临由于溶剂蒸发和某些化合物的可溶性受到限制的限制.

研究的目的:

  • 研究以水为基础的混合物中与离子液体和深溶解剂混合的植物醇和单烯液晶相的形成和结构性行为.
  • 了解溶剂成分如何影响形成的液晶相的稳定性和类型.

主要方法:

  • 采用小角度X射线散射 (SAXS) 来描述凝相结构.
  • 实验是在固定脂质度 (5% w/w) 的温度范围内进行的.
  • 阶段图被绘制在水与前离子离子液体 (乙酸,乙醇酸) 和深度溶解剂 (胆与尿素,果糖或酸) 的混合物中.

主要成果:

  • 将水添加到DES-水混合物和非两性离子液体乙醇酸中,有利于更高的负曲率反向六角结构.
  • 两性离子液体乙酸在立方Pn3m阶段表现出膨胀和稳定作用.
  • 这项研究强调了溶剂结构,极性和分子大小在控制热液晶凝形成和稳定性方面的关键作用.

结论:

  • 新型溶剂系统,包括离子液体和深层环氧溶剂,可作为纯水性介质的替代品,用于制造稳定的液态晶体凝.
  • 量身定制溶剂成分可以控制由此产生的液晶相,这对先进材料和生物医学应用具有影响.
  • 了解溶剂-脂质相互作用对于设计和优化自组装软材料至关重要.