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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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The dot product is an essential concept in mathematics and physics.
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In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
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Production and Targeting of Monovalent Quantum Dots
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Silanization of quantum dots: Challenges and perspectives.

Daniil Drozd1, Huiyan Zhang2, Irina Goryacheva1

  • 1Saratov State University, Chemistry Institute, Department of General and Inorganic Chemistry, Astrakhanskaya 83, 410012, Saratov, Russia.

Talanta
|August 28, 2019
PubMed
Summary

We developed simple methods to create stable silica-coated quantum dots (QDs) for advanced imaging and analysis. The study details optimal conditions for QD silanization, enhancing their utility in various applications.

Keywords:
Cd-based quantum dotsHydrophilizationInP-based quantum dotsQuantum dot enrobed into a silica shell (QD@SiO2)Quantum dotsSilanization

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Quantum dots (QDs) offer unique optical properties but require surface modification for stability and application.
  • Silica coating provides a robust shell, enhancing QD stability and biocompatibility for diverse uses.

Purpose of the Study:

  • To present facile strategies for synthesizing stable silica-coated quantum dots (QDs).
  • To provide a detailed overview of silanization techniques, potential issues, and QD stability.
  • To compare the silica-encapsulation behavior of different QD types (In- and Cd-based).

Main Methods:

  • Silanization via water-in-oil emulsion to ensure single QD encapsulation per nanoparticle.
  • Investigation of parameters affecting silica coating: QD ligand type, silanization reagent, surfactant, and ZnS shelling.
  • Comparative analysis of InP-based QDs and CdZnSeS-nanocomposites during silica encapsulation.

Main Results:

  • DDT identified as an optimal ligand for InP-based QD silanization.
  • GOPTES and CEST demonstrated superior performance as silanization agents for InP-QDs.
  • AOT/isooctane microemulsion proved preferable for CdZnSeS-composite silanization.

Conclusions:

  • Optimized silanization strategies yield stable silica-coated QDs with enhanced properties.
  • Specific ligand and reagent choices are crucial for successful silica encapsulation of different QD compositions.
  • These findings facilitate the application of QDs in chemical/biomedical analysis and in vivo imaging.