Nanocomposites prepared by sol-gel methods

Kwiatkowski, Krzysztof C.; Lukehart, Charles M.

doi:10.1016/b978-012513920-5/50004-4

Cited by 8 publications

(7 citation statements)

References 274 publications

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“…The silver nanoparticles (Ag NPs) deposited on inorganic substrates, such as TiO 2 10 and phyllosilicates such as MMT, [11][12][13] kaolinite, 14 and synthetic layered silicate such as laponite, 15 have also been used as carriers for Ag/nanocomposites. For the synthesis of Ag NPs in the solid substrate, AgNO 3 is often used as the primary source of Ag + .…”

Section: Shameli Et Almentioning

confidence: 99%

Synthesis of silver nanoparticles in montmorillonite and their antibacterial behavior

Shameli

Ahmad²,

Zargar³

et al. 2011

IJN

126

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Silver nanoparticles (Ag NPs) were synthesized by the chemical reducing method in the external and interlamellar space of montmorillonite (MMT) as a solid support at room temperature. AgNO 3 and NaBH 4 were used as a silver precursor and reducing agent, respectively. The most favorable experimental conditions for synthesizing Ag NPs in the MMT are described in terms of the initial concentration of AgNO 3 . The interlamellar space limits changed little (d-spacing = 1.24–1.47 nm); therefore, Ag NPs formed on the MMT suspension with d-average = 4.19–8.53 nm diameter. The Ag/MMT nanocomposites (NCs), formed from AgNO 3 /MMT suspension, were characterizations with different instruments, for example UV-visible, PXRD, TEM, SEM, EDXRF, FT-IR, and ICP-OES analyzer. The antibacterial activity of different sizes of Ag NPs in MMT were investigated against Gram-positive, ie, Staphylococcus aureus and methicillin-resistant S. aureus (MRSA) and Gram-negative bacteria, ie, Escherichia coli , Escherichia coli O157:H7, and Klebsiella pneumoniae, by the disk diffusion method using Mueller-Hinton agar (MHA). The smaller Ag NPs were found to have significantly higher antibacterial activity. These results showed that Ag NPs can be used as effective growth inhibitors in different biological systems, making them applicable to medical applications.

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Section: Shameli Et Almentioning

confidence: 99%

Synthesis of silver nanoparticles in montmorillonite and their antibacterial behavior

Shameli

Ahmad²,

Zargar³

et al. 2011

IJN

126

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“…In Equation (4), neodymium oxide reacts with nitric acid to form neodymium nitrate molecules, which further react with the developing network. Neodymium nitrate gets ionized into Nd 3+ and NO À 3 ions as shown in Equation (5). Nd 3+ cations are incorporated into the Si-O-Si network and occupy the proton site of a silanol species in Equation (6).…”

Section: Synthesismentioning

confidence: 99%

“…The nanostructures of binary oxide systems containing Ln 2 O 3 (Ln, lanthanide) and SiO 2 are of great importance in nanotechnology and widely studied owing to their potential application as building blocks in optoelectronic devices [1,2], photonics [3], catalysts [4][5][6][7], waveguides [8], chemical gas sensors [9], ceramics [10] and in other areas. Neodymium-doped silica nanocomposites form a class of technologically important nanomaterials on account of their manifold applications especially in lasers.…”

Section: Introductionmentioning

confidence: 99%

Structural investigations on Nd-doped silica nanocomposites: effect of sintering temperature and dopant concentration

Narang

Rani

Aghamkar

et al. 2014

Philosophical Magazine Letters

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Neodymium-doped silica nanocomposites were prepared from an acidcatalysed sol-gel solution followed by heat treatment. The structural and microstructural properties of the prepared samples as a function of sintering temperature and Nd concentration are reported. Fourier transform infrared spectra show that phase separation occurs during heat treatment. The presence of Nd 2 O 3 and α-Nd 2 Si 2 O 7 phases in the samples was established by X-ray diffraction (XRD), and transmission electron microscopy (TEM) micrographs revealed the microstructure of the nanocomposites. From XRD patterns, the crystallite size was determined using the Debye-Scherrer formula, while the particle size was estimated from TEM micrographs. The results suggest that sintering at high temperature enhances the crystallinity and density of Nd 2 O 3 -SiO 2 nanocomposites, while the high concentration of neodymium prevents the crystallization of SiO 2 . IntroductionThe nanostructures of binary oxide systems containing Ln 2 O 3 (Ln, lanthanide) and SiO 2 are of great importance in nanotechnology and widely studied owing to their potential application as building blocks in optoelectronic devices [1,2], photonics [3], catalysts [4-7], waveguides [8], chemical gas sensors [9], ceramics [10] and in other areas. Neodymium-doped silica nanocomposites form a class of technologically important nanomaterials on account of their manifold applications especially in lasers. Several techniques, such as chemical vapour deposition [11], melt-casting [12] and the sol-gel method [13,14] have been used to fabricate these glasses. The maximum neodymia solubility in silica with a homogeneous Nd 3+ distribution obtainable by melt-casting is 0.5 wt% [15], which is too low for glasses used in lasers. The sol-gel technique has attracted large attention as it allows glasses to be prepared at a much lower temperature [16] and with better control of purity than the other traditional techniques. Moreover, it allows higher doping concentrations and a more uniform distribution of rare-earth ions in the glass host matrix. The use of sol-gel-derived silica as a glass host for laser applications requires the fulfilment of several criteria, including high density, high mechanical and thermal shock resistance, compositional purity and optical-grade quality.

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“…There is growing interest in nanostructured inorganic materials in large part because they often exhibit properties distinct from those of the bulk, that can prove usefulness in various applications. Recently, nanolanthanide oxides containing silica have attracted a great deal of interest due to their macroscopical properties such as high mechanical resistance, chemical stability, and heat resistance [1][2][3][4][5]. Specially for these applications, silica has been preferred as host matrix, due to its higher softening temperatures, higher thermal shock resistance, and lower index of refraction, over the other oxide glasses [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Neodymium Oxide in Silica Matrix by Solgel Protocol Method

Duhan

Aghamkar

Singh

2008

Physics Research International

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Formation of nanocrystalline rare earth was prepared by solgel route, using tetra-ethoxysilane and Nd (NO3)3 as precursor materials and HCl as a catalyst. The prepared samples were submitted to thermal treatments at temperature 500∘C (5 hours) and 800∘C (10 hours). Structural changes were investigated by XRD, FTIR spectroscopy, and SEM. At 800∘C (10 hours) resulted in the formation of cubic Nd2O3 nanocrystallites with average size ∼ 20 nm.

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Nanocomposites prepared by sol-gel methods

Cited by 8 publications

References 274 publications

Synthesis of silver nanoparticles in montmorillonite and their antibacterial behavior

Synthesis of silver nanoparticles in montmorillonite and their antibacterial behavior

Structural investigations on Nd-doped silica nanocomposites: effect of sintering temperature and dopant concentration

Synthesis and Characterization of Neodymium Oxide in Silica Matrix by Solgel Protocol Method

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