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http://users.encs.concordia.ca/~mojtaba/elec6271/silver%20nanoparticles.pdf

Silver nanoparticles: green synthesis and their antimicrobial activities.

A one-step simple synthesis of silver colloid nanoparticles with controllable sizes is presented. In this synthesis, reduction of [Ag(NH3)2]+ complex cation by four saccharides was performed. Four saccharides were used:  two monosaccharides (glucose and galactose) and two disaccharides (maltose and lactose). The syntheses performed at various ammonia concentrations (0.005−0.20 mol L-1) and pH conditions (11.5−13.0) produced a wide range of particle sizes (25−450 nm) with narrow size distributions, especially at the lowest ammonia concentrations. The average size, size distribution, morphology, and structure of particles were determined by dynamic light scattering (DLS), transmission electron microscopy (TEM), and UV/Visible absorption spectrophotometry. The influence of the saccharide structure (monosacharides versus disaccharides) on the size of silver particles is briefly discussed. The reduction of [Ag(NH3)2]+ by maltose produced silver particles with a narrow size distribution with an average size of ...

Silver Colloid Nanoparticles: Synthesis, Characterization, and Their Antibacterial Activity

Surface modification of inorganic nanoparticles for development of organic–inorganic nanocomposites—A review

Progress in preparation, processing and applications of polyaniline

Herein, 1,2,3-selenadiazoles were instantly prepared by hand grinding the reactants via a solventless process and tested for their ability to act as a source of selenium for the synthesis of CdSe magic-sized nanoclusters (MSNCs) with size below 2 nm. The current study describes the use of different 1,2,3-selenadiazole derivatives, viz. small chain aliphatic, long chain aliphatic, acetophenone, and aromatic derivatives, in the preparation of CdSe MSNCs. The study was carried out to check the effects of different functionalities of the precursor on the formation of MSNCs of CdSe. The MSNCs prepared using a variety of selenium precursors were analyzed by various spectroscopic techniques. A characteristic doublet in the absorption spectra and broad emission profile consistently indicated that the employed selenadiazoles were useful for the selective fabrication of single family MSNCs of CdSe, and the formation of regular quantum dots was suppressed.

1,2,3-Selenadiazole-driven single family MSNCs of CdSe

Effect of reaction rate on the properties of chemically synthesized calcium hydroxide nanoparticles

Phase pure Nickel nano-particles were synthesized by in-situ generation of nickel hydrazine hydrate complex (Ni-HH) followed by its decomposition in an alkaline glycerol medium. The synthesis can be performed in an open beaker with or without the use of surface protective reagents. By using the present method, Ni nano-particles can be prepared in large scale. The black nano-powders so-obtained were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infra-red (FTIR) spectroscopy and thermal analysis (TGA). XRD and SAED analysis revealed that the synthesized particles were pure crystalline nickel with FCC structure.

Glycerol Mediated Low Temperature Synthesis of Nickel Nanoparticles by Solution Reduction Method

Nanocomposites of polyaniline (PAni) with CdS were prepared from the reaction of dimethyl cadmium (DMCd) and hydrogen sulphide with camphor sulphonic acid (CSA) and phosphoric acid (PA) acid doped polyanilines. PAni.CSA.CdS (PAni‐I) and PAni.PA.CdS (PAni‐II), the so‐named nanocomposites in their UV‐Visible absorption spectra showed λ(abs.) at about 450–460 nm in addition to the bands at ∼320 nm and ∼600 nm due to polyaniline. The band above ∼800 nm due to conducting phase of polyanilines decreased in intensity with increasing CdS ratio. The greenish‐black composite powders showed flaky morphology under scanning electron microscopy (SEM). X‐ray diffraction (XRD) measurement showed broad pattern for hexagonal crystal structure of CdS in PAni‐I and cubic in PAni‐II with variation in particle diameter and crystal structure depending on the nature of doped polyaniline.

CdS/Polyaniline Nanocomposites: Synthesis and Characterization

Introduction A translucent UV protecting poly (methyl methacrylate) (PMMA)/TiO2 nanocomposite has been fabricated using anatase TiO2 nanoparticles by solution method. The myristic acid capped titania nanoparticles were synthesized via a simple sol-gel method, involving hydrolysis of titanium tetra isopropoxide (TTIP). So prepared nanoparticles were characterized by ultravioletvisible (UVVis), photoluminescence (PL), fourier transform infrared (FTIR) and RAMAN spectroscopy. Morphology was studied with scanning electron microscope (SEM) and transmission electron microscope (TEM). Crystal phases were analyzed by X-Ray diffraction (XRD) measurements. The BET surface area was temperature dependant. % wt. loss was found to be about less than 6%. Similarly, the TiO2/ PMMA nanocomposites were characterized by above tools. This nanocomposite film was tested for UV-shielding application via prevention of photochemical reaction between silver nitrate and Pyrrole under UVC irradiation. The films used for the shielding purpose were further analyzed by UV-Vis absorption and IR spectroscopy and by scanning electron microscope (SEM) to understand the effect of Pyrrole vapors on the film. The nanocomposite with ≤ 1.0 wt % of TiO2 showed improved thermal stability, high see through and optimum UV-shielding efficiency in the present case.

/pdf/uvc-shielding-by-nano-tio2-pmma-composite-a-chemical-m6q961n7fy.pdf

Pawan K. Khanna

Papers

1,2,3-Selenadiazole-driven single family MSNCs of CdSe

Effect of reaction rate on the properties of chemically synthesized calcium hydroxide nanoparticles

Glycerol Mediated Low Temperature Synthesis of Nickel Nanoparticles by Solution Reduction Method

CdS/Polyaniline Nanocomposites: Synthesis and Characterization

UVC-Shielding by Nano-TiO2/PMMA Composite: A Chemical Approach