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Related Concept Videos

Plastic Deformation in Circular Shafts01:20

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
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Experimental Procedure for Warm Spinning of Cast Aluminum Components
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A Shape-Persistent Polyphenylene Spoked Wheel.

Yi Liu1, Akimitsu Narita1, Joan Teyssandier2

  • 1Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.

Journal of the American Chemical Society
|December 10, 2016
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel "spoked wheel" polyphenylene molecule, a key component of a new 2D material called graphenylene. This discovery opens avenues for advanced materials with unique porous structures.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Polyphenylene synthesis presents challenges in achieving precise molecular architectures.
  • Two-dimensional (2D) materials offer unique electronic and mechanical properties.
  • Controlled synthesis of complex organic molecules is crucial for developing advanced materials.

Purpose of the Study:

  • To synthesize a shape-persistent polyphenylene with a unique "spoked wheel" structure.
  • To develop a subunit for a novel two-dimensional polyphenylene material named graphenylene.
  • To demonstrate a method for creating complex, templated polyphenylene architectures.

Main Methods:

  • Sixfold intramolecular Yamamoto coupling of a dodecabromo-substituted dendritic polyphenylene precursor.
  • Utilizing a central hexaphenylbenzene unit as a template for molecular assembly.
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy and matrix-assisted laser ionization time-of-flight mass spectrometry (MALDI-TOF MS).

Main Results:

  • Successful synthesis of a shape-persistent polyphenylene with a distinct "spoked wheel" structure.
  • Unambiguous structural confirmation of the molecule (molar mass: 3815.4 g/mol) via spectroscopic and mass spectrometry techniques.
  • Scanning tunneling microscopy (STM) visualization clearly depicted the spoked wheel structure with six internal pores.

Conclusions:

  • The study presents the first synthesis of a graphenylene subunit, a novel 2D polyphenylene.
  • The "spoked wheel" polyphenylene demonstrates precise structural control and shape persistence.
  • The findings pave the way for the development of new porous organic materials with potential applications in various fields.