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Related Concept Videos

Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

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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.
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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.
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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

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Photoelectric Effect02:26

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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...
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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...
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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.
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Triplet Fusion Upconversion Nanocapsule Synthesis
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Photon Upconversion in Aqueous Nanodroplets.

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
Summary
This summary is machine-generated.

This study presents a novel micellar fabrication method for efficient triplet fusion upconversion in aqueous solutions. This breakthrough enhances applications in biological imaging, optogenetics, and photochemistry.

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Area of Science:

  • Photochemistry
  • Materials Science
  • Biotechnology

Background:

  • Triplet fusion upconversion converts low-energy photons to higher-energy ones, with potential in imaging and photovoltaics.
  • Current methods are limited by nonpolar solvents, high dye concentrations, and poor efficiency in aqueous solutions.
  • Existing aqueous approaches using micelles often suffer from low efficiency or nanoparticle scattering.

Purpose of the Study:

  • To develop a facile and scalable method for efficient triplet fusion upconversion in aqueous environments.
  • To overcome limitations of existing methods, enabling broader applications.

Main Methods:

  • A novel micellar fabrication method was developed.
  • A high boiling point solvent was incorporated into the core of block copolymer micelles.
  • This approach effectively reduced molecular aggregation and improved upconversion efficiency.

Main Results:

  • The method demonstrated efficient photon upconversion across five different colors.
  • The system is scalable and user-friendly.
  • Reduced molecular aggregation was observed, enhancing performance.

Conclusions:

  • The developed micellar system offers a high-performance, user-friendly solution for photon upconversion in aqueous media.
  • This advancement is expected to significantly benefit optogenetics, photodynamic therapy, and photochemistry.
  • The facile preparation and improved efficiency pave the way for wider adoption of upconversion technologies.