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相关概念视频

Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

62.3K
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.
62.3K
Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
150.8K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

590
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
590
Physical Properties Affecting Solubility02:19

Physical Properties Affecting Solubility

22.3K
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...
22.3K
Colloidal precipitates01:09

Colloidal precipitates

481
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...
481
Factors Affecting Solubility04:01

Factors Affecting Solubility

33.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.0K

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相关实验视频

Updated: May 26, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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通过溶剂效应调节的胆固醇共晶铁电.

Wenbo Sun1, Han-Yue Zhang2, Xiaomeng Liu2

  • 1Department of Thoracic Surgery, The First Affiliated Hospital with Nanjing Medical University, Nanjing, 210029, P. R. China.

Advanced materials (Deerfield Beach, Fla.)
|February 25, 2025
PubMed
概括
此摘要是机器生成的。

研究人员使用胆固醇 (CHOL) 和酒精溶剂创造了新的铁电共晶. 这一突破在CHOL中诱导了铁电,为可生物降解的电子设备铺平了道路.

关键词:
1D电活性通道 1D电活性通道可生物降解的铁电制品胆固醇 铁电联合晶体 铁电联合晶体低弹性模块的低弹性模块溶剂效应是一种溶剂效应.

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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科学领域:

  • 生物材料科学 生物材料科学
  • 材料化学 材料化学
  • 固态物理 固态物理

背景情况:

  • 胆固醇 (CHOL) 是一种可生物降解,性分子,对细胞膜至关重要.
  • 虽然CHOL具有奇拉极性结构,但其铁电性以前没有被观察到.
  • 性与材料的铁电性密切相关.

研究的目的:

  • 为了研究胆固醇中铁电的诱导.
  • 探索基于胆固醇的材料在生物医学应用中的潜力.
  • 开发新的生物降解铁电材料.

主要方法:

  • 使用胆固醇与甲醇 (CHOL-MeOH) 和乙醇 (CHOL-EtOH) 通过溶剂作用构建铁电共晶.
  • 分析结构变化,包括接受者-捐赠者债券长度.
  • 密度函数理论 (DFT) 计算以确定极化逆转的能量障碍.
  • 在体外和体外对生物相容性和生物降解性的评估.

主要成果:

  • 成功合成了CHOL-MeOH和CHOL-EtOH的铁电共晶体.
  • 引入含基溶剂减少了接受器-捐赠器的长度,形成1D电活性通道.
  • 对CHOL-EtOH的DFT计算显示,极化逆转能量屏障的显著下降 (≈50%).
  • 合成的共晶体显示出良好的生物相容性和生物降解性.

结论:

  • 溶剂效应,特别是基,可以在基于胆固醇的材料中诱导铁电.
  • 胆固醇共晶体对极化逆转的能量障碍显著降低,从而促进重定向.
  • 这些生物相容和生物可降解的铁电CHOL共晶体对智能植入式电子设备具有前景.
  • 这项研究为生物材料应用设计可生物降解铁电材料提供了洞察力.