Dual applications of silver nanoparticles incorporated functionalized MWCNTs grafted surface modified PAN nanofibrous membrane for water purification

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 109241-109252 ◽  
Author(s):  
S. Raj Kumar ◽  
P. Gopinath
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Water Purification ◽  
Nanofibrous Membrane ◽  
Toxic Heavy Metals ◽  
Ag Nps ◽  
Multiwalled Carbon ◽  
Surface Modified ◽  
Functionalized Mwcnts

Herein, we have developed silver nanoparticles (Ag NPs) incorporated carboxylated multiwalled carbon nanotubes (MWCNTs) grafted aminated polyacrylonitrile (APAN) nanofibrous membrane pertinent for the removal of toxic heavy metals and bacteria.

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.

scholarly journals Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Ngo Xuan Dinh ◽  
Nguyen Van Quy ◽  
Tran Quang Huy ◽  
Anh-Tuan Le
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Cell Membrane ◽  
Multiwalled Carbon Nanotubes ◽  
Ultrastructural Changes ◽  
Physical Interaction ◽  
Ag Nps ◽  
Multiwalled Carbon ◽  
Membrane Function

Recently, development of carbon nanocomposites composed of carbon nanostructures and metal nanoparticles has attracted much interests because of their large potential for technological applications such as catalyst, sensor, biomedicine, and disinfection. In this work, we established a simple chemistry method to synthesize multiwalled carbon nanotubes (MWCNTs) decorated with silver nanoparticles (Ag-NPs) using a modified photochemical reaction (Tollens process). The formation and interaction of Ag-NPs with functionalized groups on the surface of MWCNTs were analyzed by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. The average size of Ag-NPs on the MWCNTs was approximately ~7 nm with nearly uniform size distribution. Antibacterial effect of Ag-MWCNTs nanocomposites was evaluated against two pathogenic bacteria including Gram-negativeEscherichia Coliand Gram-positiveStaphylococcus aureusbacteria. Interaction and bactericidal mechanism of Ag-MWCNTs with tested bacteria was studied by adapting the electron microscopy. Analysis on ultrastructural changes of bacterial cells indicates that antibacterial action mechanism of Ag-MWCNTs is physical interaction with cell membrane, the large formation of cell-Ag-MWCNTs aggregates, and faster destructibility of cell membrane and disruption of membrane function, hence resulting in cells death.

Covalent functionalization of multiwalled carbon nanotubes with super-hydrophobic property

2018 ◽  
Vol 38 (6) ◽  
pp. 537-543 ◽  
Author(s):  
Minghua Li ◽  
Zhiyuan Xu ◽  
Jinyang Chen ◽  
San-E Zhu
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Chemical Interaction ◽  
Hydrophobic Property ◽  
Covalent Functionalization ◽  
Multiwalled Carbon ◽  
Surface Contact Angle ◽  
Loading Ratio ◽  
Functionalized Mwcnts

AbstractSurface covalent functionalization of multiwalled carbon nanotubes (MWCNTs) is carried out by coupling of isocyanate-decorated MWCNTs with hydroxyl-terminated polydimethylsiloxane (HTPS), resulting in the formation of functionalized MWCNTs. Thermogravimetry analysis (TGA) of functionalized MWCNTs-1,2,3 exhibits the similar peaks in the temperature range of 200–500°C, which all correspond to the degradation of chemically grafted polyurethane on the nanotube surface. Field emission scanning electron microscopy (FE-SEM) reveals that as the polyurethane grafted onto the surface of MWCNTs loading ratio increased, the surface roughness of the MWCNTs is reduced. The chemical interaction of HTPS with isocyanate-decorated nanotube surface using the grafting-to strategy in a one-step process is confirmed by Fourier transform infrared spectroscopy (FT-IR). The surface contact angle of MWCNTs-3 with the largest content of polyurethane reached 171°, indicating that the surface covered with low surface energy polyurethane shows a super-hydrophobic property. The good dispersion of polyurethane-functionalized MWCNT-3, particularly at high content in the NR nanocomposites, is evidenced from transmission electron microscopy (TEM).

Shape-Memory Nanocomposite Elastomers Filled with Carbon Nanomaterials

2016 ◽  
Vol 100 ◽  
pp. 5-10
Author(s):  
Giuseppe Cesare Lama ◽  
Gennaro Gentile ◽  
Pierfrancesco Cerruti ◽  
Marino Lavorgna ◽  
Veronica Ambrogi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Carbon Nanomaterials ◽  
Thermomechanical Analysis ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Dispersion Test ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

In this contribution, the preparation and characterization of new shape-memory epoxy based nanocomposites filled with modified multiwalled carbon nanotubes are reported. The study has been focused on the optimization of the preparation methodology and on the evaluation of the effect of different contents of surface modified carbon nanotubes on the properties and the microstructure of the obtained materials. In particular, dispersion test, infrared spectroscopy, thermogravimetric analysis and bright field transmission electron microscopy have been carried out to analyze the modified filler. Moreover, the obtained nanocomposites have been characterized by morphological analysis, differential scanning calorimetry, thermomechanical analysis and X-ray analysis in order to clarify the effect of the nanofiller on the structure and shape memory properties of the materials.

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