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Mean free path and Mean free time01:22

Mean free path and Mean free time

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Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Preparation of Multifunctional Silk-Based Microcapsules Loaded with DNA Plasmids Encoding RNA Aptamers and Riboswitches
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Robust Metallic Microcapsules: A Direct Path to New Multifunctional Materials.

Dawei Sun1,2, He Zhang3, Xin Zhang4

  • 1Department of Mechanical and Aerospace Engineering , The Hong Kong University of Science and Technology , Kowloon 999077 , Hong Kong SAR.

ACS Applied Materials & Interfaces
|February 8, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed novel metal microcapsules with exceptionally strong shells, significantly enhancing the durability and applications of smart materials like self-healing composites and advanced coatings.

Keywords:
barrier propertyelectroless platingmetallic microcapsulemultifunctional materialrobustness

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Microcapsule shell robustness is critical for smart material performance and application scope.
  • Existing microcapsules often lack the necessary mechanical strength and environmental stability for demanding applications.

Purpose of the Study:

  • To design and synthesize novel metal microcapsules with superior shell properties.
  • To evaluate the thermal and chemical stability of the synthesized metal microcapsules.
  • To investigate the impact of these microcapsules on the mechanical properties of epoxy composites.

Main Methods:

  • Electroless plating directly onto liquid droplet surfaces to form metal shells.
  • Testing thermal stability up to 600 °C.
  • Assessing stability in polar solvents like acetone and N,N-dimethylformamide (DMF).
  • Evaluating mechanical properties of epoxy composites containing the metal microcapsules.

Main Results:

  • Synthesized metal microcapsules with metal shells exhibiting high thermal (600 °C) and chemical stability.
  • Achieved mechanical shell strength ten times higher than previously reported microcapsules.
  • Demonstrated stable mechanical properties in smart epoxy composites across varying microcapsule concentrations, a novel finding.
  • Established a method for synthesizing microcapsules with tunable structures (shell thickness, core fraction).

Conclusions:

  • The novel metal microcapsules offer unprecedented shell strength and stability for advanced smart materials.
  • The electroless plating technique on liquid surfaces opens new avenues for smart material development.
  • These metal microcapsules hold significant potential for applications in smart metallic matrices, conductive materials, and pH-responsive systems.