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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Actin Polymerization01:42

Actin Polymerization

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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Microencapsulated Comb-Like Polymeric Solid-Solid Phase Change Materials via In-Situ Polymerization.

Wei Li1, Xiaoye Geng2, Rui Huang3

  • 1State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Advanced Fibers and Energy Storage, School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China. hiweilee@gmail.com.

Polymers
|April 11, 2019
PubMed
Summary

This study developed microencapsulated comb-like polymers as solid-solid phase change materials (PCMs). These advanced PCMs demonstrate superior thermal stability and permeability resistance compared to traditional organic PCMs.

Keywords:
comb-like polymermicrocapsulepermeability resistancephase change materialsthermal stability

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Phase change materials (PCMs) are crucial for thermal energy storage.
  • Enhancing thermal stability and preventing leakage are key challenges for PCMs.

Purpose of the Study:

  • To fabricate microencapsulated comb-like polymers as solid-solid PCMs.
  • To investigate the impact of different core materials on micro/nanocapsule properties.
  • To evaluate the thermal stability and permeability resistance of the developed PCMs.

Main Methods:

  • In-situ polymerization for micro/nanocapsule fabrication.
  • Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) for morphology analysis.
  • Differential scanning calorimetry (DSC) for crystallization behavior investigation.

Main Results:

  • Microencapsulation of comb-like polymers significantly improved thermal stability.
  • Permeability resistance was markedly enhanced compared to low molecular organic PCMs.
  • Surface morphology and microstructure were systematically studied for various core materials.

Conclusions:

  • Microencapsulated comb-like polymeric PCMs offer excellent thermal stability and permeability resistance.
  • These materials show potential for applications in organic solution spinning, melt processing, and organic coatings.