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1
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SYNTHESIS OF NANOCOMPOSITE CHITOSAN-TiO2 AND ITS APPLICATION AS PHOTODEGRADATION AGENT OF METHILEN BLUE IN AQUEOUS MEDIUM

100%
Mohadi R., Kurniawan C., Yuliasari N., Hidayati N., Lesbani A.
Progress on Chemistry and Application of Chitin and its Derivatives
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2015
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vol. 20
213-221
EN
Synthesis of nanocomposite chitosan-TiO2 have been done. Nanocomposite made of chitosan was isolated from crab shell namely α-chitosan and squid pens as β-chitosan. Nanocomposite was synthesized by combining the function of chitosan as supporting material with TiO2 particle that have high photocatalytic activity. The nanocomposite characterized by FTIR and SEM/EDX analysis show the functional groups of chitosan and and also surface morphology of nanocomposite chitosan-TiO2. The FTIR spectra shows adsorption band of O-Ti-O at 677-695 cm-1, and characteristic adsorption band of chitosan at wavenumbers 1600 cm-1 for -NH2 and 3400 cm-1 for -OH. From SEM/EDX analysis can be seen that TiO2 has been distributed evenly on surface of chitosan. The nanocomposite was applied for photodegradation of methylene blue in aqueous medium on UV light radiation. The optimum percent photodegradation at wavelength 660 nm by the nanocomposite α-chitosan-TiO2 and β-chitosan-TiO2 are 59,48% and 59,82%, respectively.
2
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The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO2nanocomposite

100%
Xu Q., Chen F., Li X., Zhang Z.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 3
20-24
EN
The present study investigated the effect of the surface functional groups of nanosilica on the interfacial, crystallization, and thermal stability of polyamide 6/SiO2 (PA6/SiO2) nanocomposite, in which nanosilica was modified in situ with both 3-triethoxysilylpropylamine and 3-methacryloxypropyltrimethoxy silane¬ (KH-550 and KH-570). The FTIR analysis results showed the chemical bonding action between the reacting amino groups of nanosilica and end carboxyl groups of polyamide 6 enhanced with increasing the ratio of KH-550 and KH-570. The XRD spectrum indicated that the crystal structure of PA6/SiO2 nanocomposites tended to form α crystal type that was beneficial to an improvement of mechanical properties, and which was in agreement with the results of mechanical strength measurements. It was also found that crystallization temperature and crystallization rate of PA6/SiO2 nanocomposites were lower than that of neat polyamide 6.
3
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The Influence of Calcination Temperature on Structural and Optical properties of ZnO-SiO2 Nanocomposite by Simple Thermal Treatment Route

88%
Alibe I. M., Matori K. A., Sidek H. A. A., Yazid Y., Saion E., Alibe A. M., Zaid M. H. M., Engku A. E. A. G., Zangina T.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 2
4
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Organic-inorganic hybrid materials based on N=C=O functionalised silan modified with titanium and zirconium

88%
Ivanova Y., Dimitriev Y., Gerganova T., Bryaskova R., Fernandes M., Miranda Salvado I.
Open Chemistry
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2005
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vol. 3
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issue 3
452-469
EN
This work investigates the influence of the precursor trimethylsilil isocyanate on the sol-gel synthesis of hybrid materials. The obtained Si−O−C−N network is additionally modified by titanium and zirconium alcoxypropoxides in the range of 10 to 30 wt. %. The structure of the obtained hybrid materials before and after pyrolysis up to 1100°C was investigated by methods of XRD, FTIR and 29Si MAS NMR. We established that the hybrid structure was stable up to 600°C based on IR study. The structural transformation of the hybrid materials into oxycarbonitrogen system started at 800°C. The network of the hybrids modified by titanium remained stable and amorphous up to the final temperature of the pyrolysis (1100°C) compared to the gels modified by more than 10 wt.% Zr. It was confirmed by XRD analysis that the last mentioned are nanocomposite materials, built from carbooxynitrogen vitreous matrix and ZrO2-nanocrystals (tetragonal). The NMR method verified the presence of heterometallic bonds (Si−O−Ti and Si−O−Zr) and Q4, ZrQ3 or TiQ3, NSiO3 and D structural units in the gels.
5
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Assessment of in situ-Prepared Polyvinylpyrrolidone-Silver Nanocomposite for Antimicrobial Applications

88%
El Hotaby W., Sherif H., Hemdan B., Khalil W., Khalil S.
Acta Physica Polonica A
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2017
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vol. 131
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issue 6
1554-1560
EN
Polyvinylpyrrolidone (PVP) is employed in several potential applications, relying of its special chemical and physical properties in addition to its low toxicity and biocompatibility. The aim of this work is to prepare polyvinylpyrrolidone-silver (PVP-Ag) nanocomposite with high inhibiting effect on the microbial growth and low cytotoxicity. In situ prepared small stable spherical silver nanoparticles, with narrow range particle size distribution, were obtained by easy, economical and rapid chemical reduction method. Silver ions were reduced to silver nanoparticles using low amount of sodium borohydride (NaBH₄) as a strong reducing agent. PVP-Ag nanocomposite was prepared using PVP as a stabilizing and capping agent. Formation of the spherical silver nanoparticles with mean particle size 5 nm was confirmed by ultraviolet-visible spectroscopy, high resolution transmission electron microscopy, and dynamic light scattering. The inhibiting growth effect of the nanocomposite toward Gram-positive bacteria (Staphylococcus aureus), Gram-negative bacteria (Pseudomonas aeruginosa), and yeast fungus (Candida albicans) were studied. The cytotoxicity of the nanocomposite against BJ1 normal skin fibroblast cell line was tested. Results of this work presented perfect antimicrobial activity of the PVP-Ag nanocomposite towards bacteria and fungi with low cytotoxicity, which may lead to promising applications in skin wound healing.
6
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Synthesis of carrageenan/multi-walled carbon nanotube hybrid hydrogel nanocomposite for adsorption of crystal violet from aqueous solution

75%
Hosseinzadeh H.
Polish Journal of Chemical Technology
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2015
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vol. 17
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issue 2
70-76
EN
A novel polysaccharide-based hydrogel nanocomposite was prepared using grafting of acrylic acid (AA) on to kappa-carrageenan (κC) by incorporating multi-walled carbon nanotube (MCNT). In fact, MCNTs were used as nano-sized reinforcements in the synthesized nanocomposite. Spectroscopy together with morphology proved relatively strong κC-MCNT interaction. Besides, the swelling behavior of the nanocomposite hydrogel was studied. The results showed that in the presence of MCNTs, the equilibrium swelling capacity was decreased. This can be attributed to cross-linking role and hydrophilicity nature of MCNTs. The adsorption performance of hydrogel nanocomposite was also investigated for the removal of crystal violet (CV) as a cationic dye. The effects of some important parameters such as MCNT concentration, pH and contact time on the uptake of CV solution were studied. Equilibrium adsorption isotherm data of the hydrogel exhibited better fit to the Langmuir than to the Freundlich isotherm model. According to this model, the maximum adsorption capacity of κC-based hydrogel nanocomposite was found to be 118 mg . g-1.
7
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Characterization of Ceramic Particle Reinforced Titanium Composite Produced Via Powder Metallurgy

75%
Angel D. A., Miko T., Benke M., Gacsi Z., Angel D. A., Miko T., Benke M., Gacsi Z.
Archives of Metallurgy and Materials
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2020
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vol. 65
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issue 2
8
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Nickelization Effect on the High Temperature Tensile Properties of Mg-0.7Y2O3 Nanocomposite

75%
Hassan F. S., Tun K. S., Patel F., Al-Aqeeli N., Gupta M.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 3
9
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Facile synthesis of chitosan/CuO nanocomposites for potential use as biocontrol agents

75%
Siriphannon P., Iamphaojeen Y.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2018
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issue 3
10
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Correlation between Microstructure and Exothermic Reaction Kinetics of Al-CuO Thermite Nanocomposite Powders Fabricated by Cryomilling

75%
Oh M., Kim K., Ahn B.
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issue 3
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