Wood fiber ferrite micro- and nano-composite materials for EMI-shielding

2013 ◽  
pp. 117-125
Author(s):  
K Dimitrov ◽  
T Döhler ◽  
M Herzog ◽  
S Schrader ◽  
S Nenkova
Keyword(s):  
Composite Materials ◽  
Wood Fiber ◽  
Emi Shielding ◽  
Nano Composite

Space Environment Effect on Polymeric Nano-Composite Materials

2021 ◽  
Author(s):  
A. Delfini ◽  
A. Anwar ◽  
R. Pastore ◽  
L. Bassiouny ◽  
M. Marchetti ◽  
...  
Keyword(s):  
Composite Materials ◽  
Space Environment ◽  
Environment Effect ◽  
Nano Composite

Effect of Polymer Matrix in Polymer/trGO Nano-Composite for EMI Shielding Application in Microwave and Infrared Region

2021 ◽  
Vol 875 ◽  
pp. 153-159
Author(s):  
Khadija Zubair ◽  
Muhammad Fayzan Shakir
Keyword(s):  
Composite Films ◽  
Acrylonitrile Butadiene Styrene ◽  
Infrared Region ◽  
Network Analyzer ◽  
Shielding Effectiveness ◽  
Interconnected Network ◽  
Emi Shielding ◽  
Nano Composite ◽  
Reduced Graphene ◽  
Butadiene Styrene

Thermally reduced graphene oxide (trGO) was successfully prepared and confirmed by XRD then dispersed in polystyrene (PS) and Acrylonitrile-Butadiene-Styrene (ABS) polymers and evaluated for EMI shielding in microwave and infrared (IR) region. Thickness of prepared polymer/trGO composite films were 200-250 micron. It was observed that trGO has more compatibility with PS then ABS and dispersed more easily and uniformly in PS than ABS. This effect was also observed in IR shielding as ABS+15trGO have 3% transmission and PS+1% trGO have 1.5% transmission. Maximum 29 dB and 25 dB shielding effectiveness was measured by vector network analyzer (VNA) in microwave region (9-18 GHz) of PS+2% trGO and ABS+2% trGo composite respectively. These results clearly indicating that trGO is more compatible with PS than ABS and form more stable and mature interconnected network structure in PS at lower concentrations.

scholarly journals Comparison of Fracture Resistance of Teeth Presenting non-carious Cervical Lesions, Restored with Different Composite Materials

2020 ◽  
Vol 57 (1) ◽  
pp. 299-305
Author(s):  
Ruxandra Margarit ◽  
Livia Alice Tanasescu ◽  
Dana Bodnar ◽  
Camelia Gabriela Ion ◽  
Mihai Burlibasa ◽  
...  
Keyword(s):  
Composite Materials ◽  
Fracture Resistance ◽  
Mean Value ◽  
P Value ◽  
Cervical Lesions ◽  
Nano Composite ◽  
Commercial Grade ◽  
Different Types ◽  
Group A ◽  
Group B

The aim of our study was to compare the fracture resistance of teeth presenting non-carious cervical lesions restored with different types of esthetic composite materials. 20 extracted unspoiled maxillary first molars were mechanically cleaned and immersed in saline solution containing 0.1% thymol at 4�C for a period of 48 hours. Cervical cavities with a cervical-occlusal diameter of 2 mm and a mesial-distal diameter of 3mm were filled with ormocer, flow nano-composite, nano-composite and compomer. Fracture resistance was tested with a universal loading machine (Lloyd Instruments), with a maximum force of 5 kN and a crosshead speed of 1.0 mm/min; the authors used NEXYGEN Data Analysis Software and ANOVA method. For the group A (commercial grade ormocer), the smallest load that determined the sample failure was 650 N and the highest load was 1050 N, the mean value being 858 N � 150.89 N. For the group B (commercial grade flow nano-composite), the smallest load is 530 N, the highest load is 800 N, mean value being 654 N � 112.6 N. For the group C (commercial grade nano-composite), the smallest load is 680 N, the highest load is 1200 N, mean value being 926 N � 209.35 N. For the group D (commercial grade compomer), the smallest load is 1100 N, highest load is 1250N, mean value being 1180 N � 62.04 N. A p value of 0.000311 (p[0.05) shows that there are significant differences between the four groups. Conclusions. The best fracture resistance of teeth presenting non-carious cervical lesions, restored with different types of esthetic composite materials is assured by the compomer, followed by the nano-composite, which proved to be superior to ormocer. The flow nano-composite gives the lowest fracture resistance.

Impact behavior on temperature effect of nano composite materials

2015 ◽  
Vol 51 (4) ◽  
pp. 561-566
Author(s):  
Hyung–Jin KIM ◽  
◽  
Jung–Kyu LEE ◽  
Sung Wi KOH
Keyword(s):  
Composite Materials ◽  
Temperature Effect ◽  
Impact Behavior ◽  
Nano Composite

scholarly journals Preparation of Polymer Nano-composite Materials to Sensing and Absorption Harmful Waves

2020 ◽  
Vol 928 ◽  
pp. 072106
Author(s):  
Ammar Yahya Al-Mamoori ◽  
Najlaa Mohamed Hadi ◽  
Sameer Hassan Al-Nesrawy ◽  
Jassim Mohammed Al-Issue ◽  
Mohammed Hamza Al-Maamori
Keyword(s):  
Composite Materials ◽  
Nano Composite

Fabrication and mechanical evaluation of hydroxyapatite/oxide nano-composite materials

2013 ◽  
Vol 33 (7) ◽  
pp. 4126-4132 ◽  
Author(s):  
Khaled R. Mohamed ◽  
Hanan H. Beherei ◽  
Gehan T. El Bassyouni ◽  
Nahed El Mahallawy
Keyword(s):  
Composite Materials ◽  
Nano Composite

Integration of Carbon Nanotubes Into a Fiberglass Reinforced Polymer Composite and its Effects on Electromagnetic Shielding and Mechanical Properties

2013 ◽  
Author(s):  
Mehran Tehrani ◽  
Ayoub Y. Boroujeni ◽  
Majid Manteghi ◽  
Zhixian Zhou ◽  
Marwan Al-Haik
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Composite Materials ◽  
Electromagnetic Interference ◽  
Hybrid Composites ◽  
Fiber Surface ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electrically Conductive ◽  
Coated Fabric

Electromagnetic (EM) waves, such as electronic noise and radio frequency interference can be regarded as an invisible electronic pollution which justifies a very active quest for effective electromagnetic interference (EMI) shielding materials. Highly conductive materials of adequate thickness are the primary solutions to shield against EMI. Equipment cases and basic structure of space aircraft and launch vehicles have traditionally been made of aluminum, steel and other electrically conductive metals. However, in recent years composite materials have been used for electronic equipment manufacturing because of their lightweight, high strength, and ease of fabrication. Despite these benefits, composite materials are not as electrically conductive as traditional metals, especially in terms of electrical grounding purposes and shielding. Therefore, extra effort must be taken to resolve these shortcomings. The present work demonstrates a study on developing hybrid composites based on fiberglass with surface grown carbon nanotubes (CNTs) for EMI applications. The choice of fiberglass is primarily because it naturally possesses poor electrical conductivity, hence growing CNTs over glass fiber surface can significantly improve the conductivity. The fabrics were sputter-coated with a thin layer of SiO2 thermal barrier prior to growing of CNTs. The CNTs were grown on the surface of woven fiberglass fabrics utilizing a relatively low temperature technique. Raw fiberglass fabric, SiO2 coated fabric, and SiO2 coated fabric which was subjected to the identical heat treatment as the samples with CNTs were also prepared. Two-layers composite specimens based on different surface treated fiberglass fabrics were fabricated and their EMI shielding effectiveness (SE) was measured. The EMI SE of the hybrid CNT-fiberglass composites was shown to be 5–10 times of the reference samples. However, the tensile mechanical properties of the composites based on the different above mentioned fibers revealed significant degradation due to the elevated CNT growth temperature and the addition of coating layer and CNTs. To further probe the structure of the hybrid composites and the inter-connectivity of the CNTs from one interface to another, sets of 20-layers composites based on different surface treated fabrics were also fabricated and characterized.

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