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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Vortex-induced aggregation in superfluid helium droplets.

Daniel Spence1, Elspeth Latimer, Cheng Feng

  • 1Department of Chemistry, University of Leicester, Leicester LE1 7RH, UK. sfy1@le.ac.uk andrew.ellis@le.ac.uk.

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Summary
This summary is machine-generated.

Silver nanoparticle chains form within helium droplets, guided by quantized vortices. Silicon addition confirms these segmented structures are intrinsic, not from substrate impact.

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Area of Science:

  • * Atomic and Nanoscale Physics
  • * Materials Science
  • * Quantum Fluids

Background:

  • * Helium droplets serve as unique environments for nanoparticle synthesis.
  • * Nanoparticle assembly and ordering are crucial for advanced material properties.
  • * Quantized vortices in superfluids offer novel guiding mechanisms.

Purpose of the Study:

  • * Investigate the formation of silver (Ag) nanoparticles within helium droplets.
  • * Understand the self-assembly mechanisms of Ag nanoparticles.
  • * Explore the role of quantized vortices in nanoparticle arrangement.

Main Methods:

  • * Synthesis of Ag nanoparticles via atom aggregation in helium droplets.
  • * Transmission electron microscopy (TEM) for nanoparticle imaging.
  • * Deposition of nanoparticles on a thin solid surface.
  • * In-situ addition of Silicon (Si) to study nanowire formation.

Main Results:

  • * Observed chains of Ag nanorods in large helium droplets.
  • * Achieved chains of spherical Ag nanoparticles with uniform spacing by adjusting conditions.
  • * Demonstrated that quantized vortices guide the assembly of spherical nanoparticles.
  • * Confirmed segmented Ag chains are intrinsic, not due to substrate impact, via Si insertion.

Conclusions:

  • * Quantized vortices in helium droplets dictate the arrangement of Ag nanoparticles.
  • * Spherical Ag nanoparticle chains form due to vortex interaction, not intrinsic anisotropy.
  • * Segmented Ag nanostructures are an intrinsic feature of aggregation in helium droplets with vortices.