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相关概念视频

Solubility03:00

Solubility

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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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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Colloids03:22

Colloids

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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...
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Colloidal precipitates01:09

Colloidal precipitates

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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...
524
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

4.6K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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Esters to Carboxylic Acids: Saponification01:25

Esters to Carboxylic Acids: Saponification

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Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
The reaction requires a base in stoichiometric amounts, which participates in the reaction and is not regenerated later. So, the base acts as a...
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相关实验视频

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Preparation of Polypentafluorophenyl acrylate Functionalized SiO2 Beads for Protein Purification
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聚氧乙烯基组依赖的表面特性和聚合行为在基硫酸盐系统中.

Ping Li1, Zhengwei Zhang1, Jie Chai1

  • 1Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, China.

Molecules (Basel, Switzerland)
|June 13, 2025
PubMed
概括

合成和研究了具有不同多氧乙烯 (EO) 链长度的基硫酸盐表面活性剂. 较长的EO链影响了吸附动力学和泡稳定性,具有形成囊泡和乳液的特定结构,显示出极好的稳定性.

关键词:
动态表面张力 动态表面张力泡的稳定性 泡的稳定性液晶乳液是一种液晶乳液.基于烯的硫酸酸盐.一个小泡.湿透能力 湿透能力

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科学领域:

  • 表面活性剂化学 表面活性剂化学
  • 合体和表面科学科学
  • 材料科学 材料科学 材料科学

背景情况:

  • 硫酸盐是具有可调节性质的多功能表面活性剂.
  • 聚氧乙烯 (EO) 链长度显著影响表面活性剂的行为.
  • 了解结构-属性关系对于开发高级配方至关重要.

研究的目的:

  • 为了合成和表征不同EO链长度的基硫酸盐 (MS-OE3,MS-OE5,MS-OE7).
  • 研究这些表面活性剂的吸附,聚合和性能特性.
  • 为了将表面活性剂的结构与观察到的特性和表现在乳液中相关联.

主要方法:

  • 基于油脂的硫酸盐的合成.
  • 使用FT-IR和1HNMR光谱学进行结构确认.
  • 测量表面张力 (平衡和动态),以确定吸附性能.
  • 聚合研究观察小和囊泡的形成.
  • 性能评估,包括泡的稳定性和湿透性.
  • 液晶乳液的配方和稳定性测试.

主要成果:

  • 表面活性剂MS-OE3,MS-OE5和MS-OE7已成功合成和表征.
  • 确定了临界微粒度 (cmc) 和cmc (γcmc) 的表面张力.
  • 吸附动力学随着EO链长度的增加而下降.
  • MS-OE3形成了囊泡,而MS-OE5和MS-OE7在同等度下没有.
  • 随着EO链的长度,泡的稳定性下降;MS-OE3显示出较高的湿度.
  • 含有MS-OE7的液晶乳液表现出特殊的长期稳定性.

结论:

  • 聚氧乙烯链长度是控制基硫酸盐的吸附,聚合和性能的一个关键因素.
  • 通过调整EO链的长度,可以形成像囊泡这样的特定结构.
  • MS-OE7显示出稳定乳液配方的巨大潜力.
  • 这些发现为设计特定应用的表面活性剂提供了宝贵的见解.