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Related Concept Videos

Pore Size Distribution01:23

Pore Size Distribution

117
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
117
Porosity in Cement Paste01:18

Porosity in Cement Paste

125
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
125

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Diamond with Unexpected Multi-Scale Pores.

Shuaiqi Li1, Ruiang Guo2, Qian Li2

  • 1College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 400000, China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 19, 2024
PubMed
Summary

A novel high-temperature and high-pressure method using a soluble skeleton (HPHT-ss) efficiently synthesizes millimeter-level porous diamond. This material offers a high surface area-to-volume ratio for advanced applications.

Keywords:
high‐pressure and high‐temperaturemesoscopic poreporous diamondporous materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Diamond products encompass various forms like nano-polycrystalline diamond (NPD) and micron-polycrystalline diamond (MPD).
  • Porous diamond stands out due to its high surface area-to-volume ratio (SA/V) and surface functionality.
  • Existing synthesis methods like etching or microwave plasma chemical vapor deposition (MPCVD) have limitations.

Purpose of the Study:

  • To develop an efficient, inexpensive method for synthesizing millimeter-level porous diamond.
  • To explore an alternative to etching or MPCVD techniques for porous diamond production.
  • To characterize the multiscale pore structure of the synthesized porous diamond.

Main Methods:

  • Proposal of a high-temperature and high-pressure method based on a soluble skeleton (HPHT-ss).
  • Synthesis of millimeter-level porous diamonds using the developed HPHT-ss technique.
  • Analysis of temperature-pressure conditions and the formation mechanism of porous diamonds.

Main Results:

  • Successful synthesis of millimeter-level porous diamonds via the HPHT-ss method.
  • The synthesized porous diamond exhibits multiscale pores: macropores (average 75 µm) and mesopores (average 19 nm).
  • This multiscale pore distribution is a unique feature compared to porous diamond produced by other methods.

Conclusions:

  • The HPHT-ss method provides an efficient and cost-effective route for porous diamond synthesis.
  • Porous diamond synthesized via HPHT-ss possesses a unique multiscale pore structure.
  • This material holds potential for applications in catalysis, adsorption, and electrochemistry due to its properties.