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Ferrocement

Ferrocement

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...

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Graphene Coatings for Biomedical Implants

Graphene Coatings for Biomedical Implants

Published on: March 1, 2013

Graphene oxide/ferrofluid/cement composites for electromagnetic interference shielding application.

Avanish Pratap Singh¹, Monika Mishra, Amita Chandra

¹Polymeric and Soft Materials Section, CSIR-National Physical Laboratory, Dr K S Krishnan Road, New Delhi-110 012, India.

|October 26, 2011

Summary

Graphene oxide-ferrofluid-cement nanocomposites achieve high electromagnetic interference (EMI) shielding effectiveness (46 dB) due to enhanced polarization and magnetic losses. This novel material offers superior EMI shielding for various applications.

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Area of Science:

Materials Science
Nanotechnology
Electromagnetics

Background:

Electromagnetic interference (EMI) poses challenges in electronic devices.
Effective EMI shielding materials are crucial for reliable electronic performance.
Cement-based materials are widely used but have limited inherent EMI shielding capabilities.

Purpose of the Study:

To prepare and evaluate graphene oxide-ferrofluid-cement nanocomposites for EMI shielding.
To investigate the impact of graphene oxide and ferrofluid on shielding effectiveness.
To analyze the electromagnetic shielding properties in the 8.2-12.4 GHz frequency range.

Main Methods:

Preparation of nanocomposites with varying concentrations of graphene oxide and ferrofluid in a cement matrix.
Measurement of electromagnetic interference shielding effectiveness (SE) using a vector network analyzer.
Characterization of material properties including Shore hardness, dc conductivity, and microstructural analysis using Scanning Electron Microscopy (SEM).

Main Results:

Graphene oxide-ferrofluid-cement nanocomposites achieved a shielding effectiveness of 46 dB (>99% attenuation) at 30 wt% graphene oxide.
The enhanced SE is attributed to strong polarizations and magnetic losses induced by graphene oxide and ferrofluid.
The nanocomposites exhibited a Shore hardness of 54 and dc conductivity of 10.40 S cm⁻¹.
SEM confirmed homogeneous dispersion of graphene oxide and ferrofluid within the cement matrix.

Conclusions:

Graphene oxide-ferrofluid-cement nanocomposites demonstrate excellent EMI shielding performance.
The synergistic effect of graphene oxide and ferrofluid significantly enhances the shielding effectiveness of cement.
These nanocomposites represent a promising material for effective EMI shielding applications.