scholarly journals Design of Epoxy Modified Recycled Rubber-Based Composites: Effects of Different Contents of Nano-Silica, Alumina and Graphene Nanoplatelets Modification on the Toughening Behavior

2020 ◽  
Vol 33 (1) ◽  
pp. 188-199
Author(s):  
Alaeddin Burak İREZ ◽  
Emin BAYRAKTAR
Keyword(s):  
Graphene Nanoplatelets ◽  
Nano Silica ◽  
Silica Alumina ◽  
Recycled Rubber

scholarly journals Fracture Toughness Analysis of Epoxy-Recycled Rubber-Based Composite Reinforced with Graphene Nanoplatelets for Structural Applications in Automotive and Aeronautics

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 448 ◽  
Author(s):  
Alaeddin Burak Irez ◽  
Emin Bayraktar ◽  
Ibrahim Miskioglu
Keyword(s):  
Fracture Toughness ◽  
Building Materials ◽  
Bending Strength ◽  
Mechanical Test ◽  
Graphene Nanoplatelets ◽  
Test Results ◽  
Toughening Mechanisms ◽  
Structural Applications ◽  
Recycled Rubber ◽  
Cost Efficient

This study proposes a new design of lightweight and cost-efficient composite materials for the aeronautic industry utilizing recycled fresh scrap rubber, epoxy resin, and graphene nanoplatelets (GnPs). After manufacturing the composites, their bending strength and fracture characteristics were investigated by three-point bending (3PB) tests. Halpin–Tsai homogenization adapted to composites containing GnPs was used to estimate the moduli of the composites, and satisfactory agreement with the 3PB test results was observed. In addition, 3PB tests were simulated by finite element method incorporating the Halpin–Tsai homogenization, and the resulting stress–strain curves were compared with the experimental results. Mechanical test results showed that the reinforcement with GnPs generally increased the modulus of elasticity as well as the fracture toughness of these novel composites. Toughening mechanisms were evaluated by SEM fractography. The typical toughening mechanisms observed were crack deflection and cavity formation. Considering the advantageous effects of GnPs on these novel composites and cost efficiency gained by the use of recycled rubber, these composites have the potential to be used to manufacture various components in the automotive and aeronautic industries as well as smart building materials in civil engineering applications.

Effect of nano-silica/alumina hybrid coating on erosion resistance of glass fibre-reinforced polymer for the application of wind turbine blades

2021 ◽  
pp. 135065012110527
Author(s):  
Sarah. H. Ibrahim ◽  
N. S. M. El-Tayeb
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Erosion Resistance ◽  
Turbine Blades ◽  
Industrial Applications ◽  
Special Focus ◽  
Nano Silica ◽  
Wind Turbine Blades ◽  
Glass Fibre Reinforced Polymer ◽  
Silica Alumina

Polymeric coatings reinforced with nanoparticles have recently occupied special focus by researchers and have been used in several industrial applications such as wind turbine manufacturing, oil and gas, aerospace and automotive industries. Yet, still more investigations are required to improve the tribological and mechanical properties of these coats and increase its service life. The effect of adding nano-silica/alumina to polyurethane coatings have been studied, however, their erosion resistance has not been investigated yet. The main purpose of this research is to investigate the erosion resistance of hybrid nano-silica/alumina polyurethane compositions with different weight fractions. To do this, erosion resistance experiments, scanning electron microscope and Zetasizer experiments to assess the agglomeration percentage were carried out. Results showed that the hybrid composition of nano-silica/alumina polyurethane significantly decreased the erosion rate and that the reduction in agglomeration was mirrored in much enhanced erosion resistance of the nanocomposites.

Determining the Degree of Nanopowders Hydrophilicity by the Ratio Fractal Dimension to the Specific Surface

2015 ◽  
Vol 1085 ◽  
pp. 44-49
Author(s):  
Ludmila S. Vikulina ◽  
Andrey V. Nomoev ◽  
Anna Yu. Godymchuk
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fractal Dimension ◽  
Specific Surface ◽  
Relativistic Electron Beam ◽  
Comparative Assessment ◽  
Nano Silica ◽  
Transmission Electron ◽  
Silica Alumina ◽  
Microscopy Images

The fractal dimension of a large group of nano-silica, alumina, titanium oxide, and Gd2O3 and Y2O3 was calculated by means of original program. Nanopowders of used oxides are created in two main ways, such as evaporation substances by relativistic electron beam and high temperature hydrolysis. The fractal dimension was calculated upon transmission electron microscopy images obtained with different magnification. It was managed to establish that it's possible to make a comparative assessment of the degree of hydrophilicity of the nano-silica's samples by means of attitude fractal dimension to the specific surface.

Preparation, Morphology and Properties of Nano-silica-alumina Co-doped Polyimide Three-layer Composite Films

2011 ◽  
Vol 19 (2-3) ◽  
pp. 189-196 ◽  
Author(s):  
Ling Weng ◽  
Lizhu Liu ◽  
Liqian Yang ◽  
Jiaqi Lin
Keyword(s):  
Composite Films ◽  
Nano Silica ◽  
Layer Composite ◽  
Silica Alumina ◽  
Co Doped

Fluidized Catalytic Cracking Catalyst Microstructure as Determined by A Scanning Ion Microprobe

1990 ◽  
Vol 48 (2) ◽  
pp. 302-303
Author(s):  
J.K. Lampert ◽  
G.S. Koermer ◽  
J.M. Macaoy ◽  
J.M. Chabala ◽  
R. Levi-Setti
Keyword(s):  
Catalytic Cracking ◽  
Secondary Ion Mass Spectrometry ◽  
Fuel Oil ◽  
Ion Microprobe ◽  
Fluidized Catalytic Cracking ◽  
Ion Probe ◽  
Silica Alumina ◽  
Resolution Imaging ◽  
The University ◽  
High Spatial Resolution Imaging

We have used high spatial resolution imaging secondary ion mass spectrometry (SIMS) to differentiate mineralogical phases and to investigate chemical segregations in fluidized catalytic cracking (FCC) catalyst particles. The oil industry relies on heterogeneous catalysis using these catalysts to convert heavy hydrocarbon fractions into high quality gasoline and fuel oil components. Catalyst performance is strongly influenced by catalyst microstructure and composition, with different chemical reactions occurring at specific types of sites within the particle. The zeolitic portions of the particle, where the majority of the oil conversion occurs, can be clearly distinguished from the surrounding silica-alumina matrix in analytical SIMS images.The University of Chicago scanning ion microprobe (SIM) employed in this study has been described previously. For these analyses, the instrument was operated with a 40 keV, 10 pA Ga+ primary ion probe focused to a 30 nm FWHM spot. Elemental SIMS maps were obtained from 10×10 μm2 areas in times not exceeding 524s.

Preliminary study on removal of nitrate nitrogen in aqueous samples by microbial nano-silica ball

2014 ◽  
Author(s):  
Jia Lu ◽  
Xiaohou Shao ◽  
Chao Yin ◽  
Xinyu Mao ◽  
Long Wang ◽  
...  
Keyword(s):  
Nitrate Nitrogen ◽  
Aqueous Samples ◽  
Nano Silica ◽  
Preliminary Study
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