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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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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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Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Strain-controlled shell morphology on quantum rods.

Botao Ji1,2, Yossef E Panfil1,2, Nir Waiskopf1,2

  • 1Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.

Nature Communications
|January 4, 2019
PubMed
Summary
This summary is machine-generated.

Controlling the shell growth rate of semiconductor nanocrystals tunes their morphology. This allows for unique helical structures with enhanced properties for various applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Semiconductor heterostructure nanocrystals, particularly core/shell structures, are vital for diverse technological applications.
  • Controlling the morphology of these nanocrystals is key to optimizing their performance.

Purpose of the Study:

  • To investigate the effect of shell growth rate on the morphology of Zinc Sulfide (ZnS) shells on Zinc Selenide (ZnSe) quantum rods.
  • To explore the formation of novel nanoscale structures and their impact on material properties.

Main Methods:

  • Synthesizing ZnSe quantum rods and coating them with ZnS shells under varying controlled growth rates.
  • Utilizing electron microscopy and spectroscopy to analyze the resulting nanocrystal morphology and optical properties.

Main Results:

  • Decreasing the ZnS shell growth rate tuned morphology from flat to islands-like, reducing interfacial strain.
  • Approaching the thermodynamic limit of growth speed resulted in coherent shell growth and a unique helical-shell morphology.
  • The helical morphology demonstrated minimized strain and surface energy, maintaining band gap emission without trap states.

Conclusions:

  • Template-free induction of nanoscale chirality is achievable through controlled colloidal growth.
  • Achieving thermodynamic-controlled growth in semiconductor nanocrystals enables the formation of unique morphologies with significant potential for advanced applications.