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相关概念视频

Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

71.4K
Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
71.4K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

17.6K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
17.6K
Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

9.4K
This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
9.4K
Photoelectric Effect02:26

Photoelectric Effect

39.1K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
39.1K
Precipitation Reactions03:10

Precipitation Reactions

64.4K
In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
64.4K
Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

63.6K
An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
63.6K

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Triplet Fusion Upconversion Nanocapsule Synthesis
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在水性纳米滴中升级光子

Samuel N Sanders1, Mahesh K Gangishetty1, Matthew Y Sfeir2,3

  • 1Rowland Institute at Harvard , Cambridge , Massachusetts 02142 , United States.

Journal of the American Chemical Society
|June 12, 2019
PubMed
概括
此摘要是机器生成的。

这项研究提出了一种用于水溶液中高效三重聚变的新型细胞制造方法. 这项突破有助于生物成像,光遗传学和光化学的应用.

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科学领域:

  • 摄影化学
  • 材料科学
  • 生物技术

背景情况:

  • 三重聚变将低能光子转换为高能光子,在成像和光伏中具有潜力.
  • 目前的方法受到非极性溶剂,高染料度和水溶液效率的限制.
  • 现有的使用小粒的水性方法通常具有低效率或纳米粒子散射.

研究的目的:

  • 开发一种简单且可扩展的方法,用于在水环境中高效的三重聚变.
  • 克服现有方法的局限性,从而实现更广泛的应用.

主要方法:

  • 开发了一种新型的微粒制造方法.
  • 一种高沸点溶剂被纳入了块共聚物的核心.
  • 这种方法有效地减少了分子聚合,提高了上转换效率.

主要成果:

  • 这种方法在五种不同的颜色中证明了高效的光子上转换.
  • 该系统可扩展且易于使用.
  • 观察到分子聚合的减少,提高了性能.

结论:

  • 开发的微粒系统为水性介质中的光子上升转换提供了高性能,易于使用的解决方案.
  • 这一进步预计将对光遗传学,光动力学治疗和光化学产生重大益处.
  • 易于准备和提高效率为更广泛采用升级技术铺平了道路.