Effect of Nano-Silica on Flexural Properties of Epoxy Resin

2011 ◽  
Vol 383-390 ◽  
pp. 3845-3848 ◽  
Author(s):  
Fang Liu ◽  
Zhen Qing Wang ◽  
Wen Yan Liang ◽  
Yong Wei Qu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Epoxy Resin ◽  
Flexural Modulus ◽  
Silica Particles ◽  
Flexural Properties ◽  
Nano Silica ◽  
Pure Epoxy ◽  
Epoxy Matrices ◽  
Scanning Electron

Based on Zwick/Roell,this paper had carried on flexural experiments of epoxy resin filled with nano-silica particles, obtaining related mechanical properties.Microstructures of nanocomposites were analyzed by scanning electron microscopy (SEM) in the meanwhile. The flexural experiments revealed that nano- silica particles strengthened epoxy resin very well, and flexural modulus of modified matrices rised due to rigid silica particles, compared with pure epoxy matrices. Flexural strengths of epoxies modified by silica nanoparticles improved significantly.

The effect of nitrile-functionalized nano-aluminum oxide on the thermomechanical properties and toughness of phthalonitrile resin

2016 ◽  
Vol 29 (1) ◽  
pp. 113-123 ◽  
Author(s):  
Shuyan Shan ◽  
Xinggang Chen ◽  
Zhenjie Xi ◽  
Xiaoyan Yu ◽  
Xiongwei Qu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fracture Surface ◽  
Aluminum Oxide ◽  
Flexural Modulus ◽  
Thermomechanical Properties ◽  
Flexural Properties ◽  
Enhancement Effect ◽  
Fracture Surface Analysis ◽  
Scanning Electron

Resorcinol-based phthalonitrile (R-CN)/nano-aluminum oxide (Al2O3) nanocomposites were prepared via a two-step approach. Firstly, Al2O3 was functionalized with nitrile groups on the surface of Al2O3 nanoparticles, which was confirmed by Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy (SEM). The effect of nano-Al2O3 particles on thermomechanical and flexural properties has been evaluated for different weight ratios ranging between 0% and 5%. Compared with pure nano-Al2O3, nitrile-functionalized Al2O3 (CN-Al2O3) particles showed a more significant enhancement effect on the properties of R-CN resin. The storage modulus of nanocomposite with 5 wt% CN-Al2O3 reaches 2679 MPa at 25°C, which is much higher than that of the pure R-CN resin. For 3 wt% CN-Al2O3-reinforced R-CN composites, it showed an increase of 54.84% in flexural strength and 21.48% in flexural modulus. SEM was employed to explore the fracture surface of composites. Micrographs of fracture surface analysis confirmed that the toughness of R-CN resin can be improved significantly by incorporating CN-Al2O3 nanoparticles.

Detection of Silica Particles in Lung Tissue by Environmental Scanning Electron Microscopy

2009 ◽  
Vol 21 (2) ◽  
pp. 133-140 ◽  
Author(s):  
Ambrogio Fassina ◽  
Matteo Corradin ◽  
Bruno Murer ◽  
Claudio Furlan ◽  
Annamaria Guolo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lung Tissue ◽  
Environmental Scanning Electron Microscopy ◽  
Silica Particles ◽  
Environmental Scanning ◽  
Scanning Electron

scholarly journals Fabrication of New Multifunctional Cotton/Lycra Composites Protective Textiles through Deposition of Nano Silica Coating

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2888
Author(s):  
Tarek Abou Elmaaty ◽  
Hanan G. Elsisi ◽  
Ghada M. Elsayad ◽  
Hagar H. Elhadad ◽  
Khaled Sayed-Ahmed ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ethylenediaminetetraacetic Acid ◽  
Crosslinking Agent ◽  
Cotton Fabrics ◽  
Human Pathogens ◽  
Nano Silica ◽  
Protection Factor ◽  
Laser Scattering ◽  
Scanning Electron

This study aims to develop multifunctional pile cotton fabrics by implementing different compositions of lycra yarns with different densities of the cotton fabric under study. Highly dispersed silica nanoparticles (SiO2 NPs) with small sizes—in the range of 10–40 nm—were successfully prepared and were analyzed using scanning electron microscopy (SEM). The particle size distribution of nano silica was determined via dynamic laser scattering (DLS) and measurements of its zeta potential. Cotton/lycra fabrics were treated using prepared SiO2 NPs in presence of ethylenediaminetetraacetic acid (EDTA) as a crosslinking agent. Energy dispersive X-ray (EDX) analysis and scanning electron microscopy (SEM) were used to characterize the nano-treated fabrics and assure homogeneous dispersion of SiO2 NPs on the cotton/lycra composites. Additionally, the nanoparticles were screened for their in vitro antibacterial activity against human pathogens such as Gram-positive Staphylococcus aureus and Bacillus cereus and Gram-negative Escherichia coli and Pseudomonas aeruginosa strains. The functional properties of the new composite pile cotton fabrics include excellent antibacterial, highly self-cleaning, and excellent UV protection factor (UPF) properties.

Effect of Nano-Silica on the Properties of Concrete and Its Interaction with Slag

2020 ◽  
pp. 036119812094319
Author(s):  
Aly M. Said ◽  
Mohammad Sajjadul Islam ◽  
Mohamed S. Zeidan ◽  
Mohamed Mahgoub
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Control Group ◽  
Portland Cement Concrete ◽  
Nano Silica ◽  
Microscopy Imaging ◽  
Mercury Intrusion ◽  
Concrete Mixtures ◽  
Imaging Results ◽  
Scanning Electron

The current study investigates the performance of concrete incorporating ground granulated blast-furnace (GGBF) slag in the presence of colloidal nano-silica. A control group of concrete mixtures is compared with a group of mixtures with 50% slag replacement, with each group examined at two different ratios of colloidal nano-silica (3% and 6% of the total cementitious material). Subsequently, the relative performance of the two groups is compared with ordinary Portland cement concrete in relation to strength and durability properties. Evaluation included experimental examination of compressive and tensile strength, rapid chloride penetration, and porosimetry using mercury intrusion tests. Furthermore, the microstructure of the cementitious matrix was evaluated using scanning electron microscopy imaging. Results of the tested concrete mixtures indicated that nano-silica particles can improve the properties of concrete containing GGBF slag. Improvement in high early strength as well as reduction in permeability are observed. Furthermore, nano-silica caused a refinement of the pore structure and an improvement to the interfacial transition zone (ITZ) as seen through mercury intrusion porosimetry (MIP) results and scanning electron microscopy imaging, respectively.

Cuticular Folds in three Species of Lycopersicon as Observed by Scanning and Transmission Electron Microscopy

1970 ◽  
Vol 28 ◽  
pp. 132-133
Author(s):  
Arthur R. Spurr
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Lycopersicon Esculentum ◽  
Epoxy Resin ◽  
Wild Species ◽  
Transmission Electron ◽  
Scanning Electron

Differences in the architecture of the cuticle of Lycopersicon esculentum, L. peruvianum, and L. pennellii (the cultivated and two wild species of tomato, respectively) were examined by scanning electron microscopy. The cuticle of L. esculentum was also studied by transmission electron microscopy to assist in the interpretation of cuticular folds.For SEM, fresh styles were removed from flowers just prior to anthesis and attached to specimen stubs and promptly observed. For TEM, the material was fixed in glutaraldehyde-Os04, dehydrated in ethanol, embedded in epoxy resin, and section-stained with uranyl and lead acetates. Observations were confined to the upper portion of the style.

Effects of Polyaniline Doped by Different Acids on Thermal Stability of Epoxy Resin

2010 ◽  
Vol 160-162 ◽  
pp. 1405-1408 ◽  
Author(s):  
Qing Ming Jia ◽  
Shao Yun Shan ◽  
Li Hong Jiang ◽  
Ya Ming Wang
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Scanning Electron Microscopy ◽  
Sulfuric Acid ◽  
Epoxy Resin ◽  
Inert Atmosphere ◽  
Pani Nanofibers ◽  
Thermal Stability Of ◽  
Scanning Electron

Polyaniline(PANI) nanofibers were firstly prepared by rapid mixture method, EP/PANI nanocomposite was obtained by in-situ adding the PANI nanofibers to epoxy resin(EP). Scanning electron microscopy(SEM) proves that the type of doped acids has a little effect on the morphologies of PANI, and the PANI doped by different acids present nanofiber structures with the diameter of about 50 nm. The thermal behaviour of EP/PANI nanocomposites were investigated in detail by using a dynamic rate mode of thermogravimetric analyser (TGA) in inert atmosphere, and the results show that the PANI nanofibers obviously improve thermal stability of pure EP. Compared with EP/PANI doped by nitric acid or sulfuric acid, EP/PANI doped by phosphoric acid has best thermal stability.

scholarly journals A Comparison of Iron Oxide Particles and Silica Particles for Tracking Organ Recellularization

2018 ◽  
Vol 17 ◽  
pp. 153601211878732 ◽  
Author(s):  
Joseph E. Kobes ◽  
George I. Georgiev ◽  
Anthony V. Louis ◽  
Isen A. Calderon ◽  
Eriko S. Yoshimaru ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Iron Oxide ◽  
Detection Limit ◽  
Confocal Microscopy ◽  
Ultrasound Imaging ◽  
Silica Particles ◽  
Iron Oxide Particles ◽  
Oxide Particles ◽  
Scanning Electron

Reseeding of decellularized organ scaffolds with a patient’s own cells has promise for eliminating graft versus host disease. This study investigated whether ultrasound imaging or magnetic resonance imaging (MRI) can track the reseeding of murine liver scaffolds with silica-labeled or iron-labeled liver hepatocytes. Mesoporous silica particles were created using the Stöber method, loaded with Alexa Flour 647 fluorophore, and conjugated with protamine sulfate, glutamine, and glycine. Fluorescent iron oxide particles were obtained from a commercial source. Liver cells from donor mice were loaded with the silica particles or iron oxide particles. Donor livers were decellularized and reperfused with silica-labeled or iron-labeled cells. The reseeded livers were longitudinally analyzed with ultrasound imaging and MRI. Liver biopsies were imaged with confocal microscopy and scanning electron microscopy. Ultrasound imaging had a detection limit of 0.28 mg/mL, while MRI had a lower detection limit of 0.08 mg/mL based on particle weight. The silica-loaded cells proliferated at a slower rate compared to iron-loaded cells. Ultrasound imaging, MRI, and confocal microscopy underestimated cell numbers relative to scanning electron microscopy. Ultrasound imaging had the greatest underestimation due to coarse resolution compared to the other imaging modalities. Despite this underestimation, both ultrasound imaging and MRI successfully tracked the longitudinal recellularization of liver scaffolds.

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