Related Experiment Video
Updated: Jun 15, 2026
15:53
Isolation and Biophysical Study of Fruit Cuticles
Published on: March 30, 2012
16.7K
Carbonized Apples and Quinces Stillage for Electromagnetic Shielding
Mila Milenkovic1, Warda Saeed2, Muhammad Yasir2
1Vinča Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia.
Nanomaterials (Basel, Switzerland)
|December 17, 2024
Summary
Researchers developed eco-friendly electromagnetic wave (EMW) shielding materials from fruit distillation biowaste. These novel carbonized materials effectively block radio frequency signal leakage and electromagnetic interference.
Area of Science:
- Materials Science
- Environmental Science
- Nanotechnology
Background:
- Electromagnetic waves (EMWs) are ubiquitous, leading to environmental pollution via electromagnetic interference (EMI) and radio frequency (RF) signal leakage.
- There is a growing demand for sustainable, cost-effective materials for effective EMW shielding.
- New material development must consider environmental impact, including pollution and energy consumption.
Purpose of the Study:
- To investigate the potential of using biowaste from fruit schnapps distillation as a precursor for EMW shielding materials.
- To develop an eco-friendly and cost-effective method for producing EMW shielding materials.
- To evaluate the EMW shielding performance of the synthesized materials.
Main Methods:
- Biowaste from apple and quince schnapps distillation was collected and treated with KOH.
- The mixture was carbonized at 850 °C under a nitrogen atmosphere.
- Material characterization involved techniques such as FTIR, Raman, EDX, XPS, TGA, and BET analysis.
- Electromagnetic wave shielding efficiency was measured using a vector network analyzer (VNA) with waveguide adapters.
Main Results:
- The synthesized materials exhibited EMW blocking capabilities in the 8 to 12 GHz frequency range.
- At 10 GHz, the carbonized biowaste demonstrated a shielding efficiency of 78.5%, effectively blocking incident electromagnetic waves.
- Structural and surface analyses confirmed the material's properties suitable for shielding applications.
Conclusions:
- Fruit distillation biowaste can be transformed into effective and sustainable EMW shielding materials.
- This research presents a promising approach for valorizing biowaste while addressing environmental concerns related to EMW pollution.
- The developed materials offer a viable eco-friendly alternative for electromagnetic interference shielding applications.
Related Concept Videos
01:18Capacitor With A Dielectric
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
01:31Dielectric Polarization in a Capacitor
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
01:15Capacitors
Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
01:27Schottky Barrier Diode
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
01:25MOS Capacitor
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...