Deposition of silver nanoparticles on multiwalled carbon nanotubes by chemical reduction process and their antimicrobial effects

2016 ◽  
Author(s):  
Adawiya J. Haider ◽  
Amin D. Thamir ◽  
Duha S. Ahmed ◽  
M. R. Mohammad
Keyword(s):  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Multiwalled Carbon Nanotubes ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Multiwalled Carbon ◽  
Antimicrobial Effects

Optical Studies on Multiwalled Carbon Nanotubes via Modified Wolff-Kishner Reduction Process

2011 ◽  
Vol 194-196 ◽  
pp. 618-624 ◽  
Author(s):  
Kim Han Tan ◽  
Bey Fen Leo ◽  
Meng Nee Ng ◽  
Roslina Ahmad ◽  
Mohd Rafie Johan
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Empirical Relationship ◽  
Reduction Process ◽  
Refraction Index ◽  
Optical Studies ◽  
Multiwalled Carbon ◽  
Simple Method ◽  
Transmission Electron ◽  
First Time

Multiwalled carbon nanotubes (MWCNTs) have been successfully synthesized by using a relatively simple method, known as modified Wolff-Kishner reduction process. Transmission electron microscopy (TEM) has shown the as-prepared MWCNTs possess straight morphologies with average inner and outer diameters, between 2 to 7 nm and 5 to 15 nm, respectively. Ultraviolet-visible (UV-Vis) absorption measurement has been conducted for the first time. The correlation between energy of the π plasmon absorbance (Eπ) and nanotube diameter (dCNT) for the as-prepared MWCNTs shows contradiction to the empirical relationship as Eπ = 4.8 + 0.7 / (dCNT)2. Other optical characteristics like transmittance, reflectance and refraction index also have been studied. This work explores the optical property of the as-prepared MWCNTs and thus provides better understanding about the feasibility of this synthesis technique.

Corrosion characteristics of an automotive coolant formulation dispersed with nanomaterials

2019 ◽  
Vol 37 (3) ◽  
pp. 245-257
Author(s):  
Sriganesh Gandham ◽  
V. Choudhary Nettem ◽  
V.C. Rao Peddy ◽  
Rajiv Kumar T. A. ◽  
Srinivas Vadapalli
Keyword(s):  
Carbon Nanotubes ◽  
Weight Loss ◽  
Silver Nanoparticles ◽  
Corrosion Resistance ◽  
Ethylene Glycol ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Automotive Systems ◽  
Alumina Particles ◽  
Surface Modified

AbstractThis paper summarizes the anti-corrosive and anti-erosive properties of water-ethylene glycol based commercial coolant dispersed with nanomaterials. Multiwalled carbon nanotubes (MWCNTs), silver nanoparticles (Ag) and nanosized alumina particles (Al2O3) are dispersed in 0.5% weight in automotive coolants and tested for anti-corrosive properties as per ASTM standards. Prior to dispersion, the nanomaterials are surface modified to get good stability in coolant solutions. The corrosion resistance is measured in terms of weight loss of materials that is commonly used in automotive systems. It is found that oxidized MWCNTs are suitable to automotive systems while silver and Al2O3 nanoparticles are found to be deleterious in nature.

Comparative evaluation of half-maximum inhibitory concentration and cytotoxicity of silver nanoparticles and multiwalled carbon nanotubes using buffalo bull spermatozoa as a cell model

2018 ◽  
Vol 34 (9) ◽  
pp. 640-652 ◽  
Author(s):  
Sandhya Sanand ◽  
Sandeep Kumar ◽  
Nisha Bara ◽  
Gautam Kaul
Keyword(s):  
Oxidative Stress ◽  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Multiwalled Carbon Nanotubes ◽  
Inhibitory Concentration ◽  
Membrane Integrity ◽  
Time Interval ◽  
Half Maximum ◽  
Ag Nps ◽  
Multiwalled Carbon

There is a dearth of information regarding the safety of silver nanoparticles (Ag NPs) and multiwalled carbon nanotubes (MWCNTs) with respect to their impact on human/animal health and the environment. This study aimed to determine the half-maximum inhibitory concentration (IC50) of Ag NPs and MWCNTs by employing different doses and time interval combinations in buffalo bull spermatozoa. Semen samples containing 100 million spermatozoa each were incubated with 1, 10, 25, 50, 75 and 100 µg/mL of Ag NPs and MWCNTs at 37°C for 30, 60 and 120 min. Sperm viability was monitored by the MTT assay and eosin–nigrosin staining followed by estimation of IC50 values using correlation–regression analysis. Spermatozoa treated with IC50 doses of Ag NPs and MWCNTs were also assessed for different sperm functionality parameters including oxidative stress and membrane integrity. These parameters were observed to be significantly affected in treated spermatozoa compared with the controls. We concluded that both nanomaterials showed cytotoxicity, mediated principally via oxidative stress. This work has provided valuable toxicological information that will serve as a benchmark for future studies aimed at safe use of nanomaterials.

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