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Related Concept Videos

Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

509
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
509
Bioplastics01:27

Bioplastics

1
Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Ferrocement01:30

Ferrocement

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Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
911
Carbonation Shrinkage01:24

Carbonation Shrinkage

546
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
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Superplasticizers01:30

Superplasticizers

407
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
407

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Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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Multifunctional Stiff Carbon Foam Derived from Bread.

Ye Yuan1, Yujie Ding1, Chunhui Wang1

  • 1Center for Composite Materials and Structures, Harbin Institute of Technology , Harbin 150080, People's Republic of China.

ACS Applied Materials & Interfaces
|June 14, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a low-cost, stiff carbon foam from flour. This lightweight material offers excellent electromagnetic interference shielding and thermal insulation, making it suitable for industrial applications and energy efficiency improvements.

Keywords:
EMI shieldingcarbon foammechanically stiffthermal insulatingtunable pore structure

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Creating stiff, multifunctional 3D porous carbon architectures affordably remains a significant challenge.
  • Existing materials often lack the desired combination of mechanical strength, low density, and versatile functionality.

Purpose of the Study:

  • To develop a cost-effective method for producing lightweight and stiff three-dimensional porous carbon foam (CF).
  • To investigate the potential of this CF for applications in electromagnetic interference (EMI) shielding and thermal insulation.

Main Methods:

  • Utilized flour as the primary precursor material.
  • Employed a straightforward fermentation and carbonization process to create the carbon foam with adjustable pore structure.

Main Results:

  • Achieved a lightweight carbon foam with a density of 0.29 g/cm³ and a high compressive strength of 3.6 MPa (compressive modulus of 121 MPa).
  • Demonstrated excellent specific electromagnetic interference shielding effectiveness (78.18 dB·cm³/g).
  • Observed low thermal conductivity (as low as 0.06 W/m·K) and high fire resistance.

Conclusions:

  • The developed carbon foam is a promising economical and robust material for industrial applications.
  • Its properties make it suitable for lightweight EMI shielding and effective thermal insulation, contributing to environmental protection and energy efficiency.