Preparation of cobalt–titanium dioxide nanocomposite films by combining inverse micelle method and plasma treatment

2007 ◽  
Vol 61 (11-12) ◽  
pp. 2173-2177 ◽  
Author(s):  
Naoki Arimitsu ◽  
Akira Nakajima ◽  
Yoshikazu Kameshima ◽  
Yuko Shibayama ◽  
Hisashi Ohsaki ◽  
...  
2013 ◽  
Vol 544 ◽  
pp. 352-356 ◽  
Author(s):  
Xiaoxu Liu ◽  
Jinghua Yin ◽  
Yunan Kong ◽  
Minghua Chen ◽  
Yu Feng ◽  
...  

2020 ◽  
Vol 268 ◽  
pp. 116464
Author(s):  
L. Maldonado-Larios ◽  
R. Mayen-Mondragón ◽  
R.D. Martínez-Orozco ◽  
U. Páramo-García ◽  
N.V. Gallardo-Rivas ◽  
...  

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2306
Author(s):  
Nusrat Sharmin ◽  
Chengheng Pang ◽  
Izumi Sone ◽  
James Leon Walsh ◽  
Cecilia Górriz Fernández ◽  
...  

In this study, sodium alginate (SA)-based, eco-friendly nanocomposites films were synthesized for potential food packaging applications using silver nitrate (AgNO3) as the metal precursor, reactive nitrogen and oxygen species (RNOS) created within plasma activated water (PAW), or through cold plasma treatment (CP) as reducing agent and SA as stabilizing agent. The formation of silver nanoparticles (AgNPs) was confirmed via the absorption peaks observed between 440 and 450 nm in UV-vis spectroscopy. The tensile strength (TS) and tensile modulus (TM) of the nanocomposite films were significantly higher than those of the SA films. An increase in the TS was also observed as the AgNP concentration was increased from 1 to 5 mM. The storage modulus (G’) of the nanocomposite solution was higher than that of the SA solution. The synthesis of AgNPs resulted both in a higher solution viscosity and a more marked shear-thinning effect. The synthesized AgNPs showed antimicrobial activity against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. The AgNPs were spherical in shape with an average size of 22 nm.


1998 ◽  
Vol 10 (1) ◽  
pp. 25-26 ◽  
Author(s):  
Norma R. de Tacconi ◽  
Judith Carmona ◽  
William L. Balsam ◽  
Krishnan Rajeshwar

2015 ◽  
Vol 10 (8) ◽  
pp. 408-413 ◽  
Author(s):  
Sheila Shahidi ◽  
Mahmood Ghoranneviss ◽  
Mohammad Ahmadi ◽  
Abosaeed Rashidi

2020 ◽  
Vol 34 (28) ◽  
pp. 2050310
Author(s):  
M. A. Ramazanov ◽  
A. M. Rahimli ◽  
F. V. Hajiyeva

The tendency to improve the properties of insulating materials by incorporating inorganic nanoparticles has become necessary in order to design new insulation systems. In this study, PVC/TiO2-based nanocomposites with different loadings (3, 5 and 10 wt.%) of TiO2 nanoparticles were prepared by the solution mixing method. The morphology of the prepared nanocomposites was studied by Atomic Force Microscope (AFM). Experimentally, it was found that as the concentration increases, the size of the surface structural elements and particle size increases. Photoluminescence (PL) analysis of samples shows improvement compared to the pristine polymer. Furthermore, PL intensity for nanocomposites increases depending on the concentration and saturation occurs at a certain amount of titanium dioxide nanoparticles. The increase in luminescence intensity till a certain nanoparticle content is due to the growth of the luminescent surface area. Further saturation is explained by the increase in particle size with no increase or a slight reduction in surface area. Dielectric properties of nanocomposites were studied. It was found that dielectric permittivity of the materials increases as the nanoparticle volume content increases and it reaches at its highest value for the nanocomposites with 3% nanoparticle content. The optical properties of the polymer and nanocomposite films were studied in the region 200 nm to 600 nm. It was found that the PVC/TiO2 nanocomposites showed enhancement in the absorbance intensities which was more significant for the nanocomposites with higher nanoparticle content compared to the pristine polymer. Furthermore, absorption spectra were used to calculate the optical bandgap of the prepared nanocomposite films and redshift observed in the calculated values of bandgap for nanocomposites. Consequently, it was proved that by incorporating TiO2 nanoparticles into the polymer matrix, the spectral region of the samples can be expanded resulting in broadened application of such systems in various fields of science and technology.


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