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Green Synthesis of Metallic Nanoparticles via ..

N2 - The increasing impact of metallic nanoparticles in life sciences has stimulated the development of new techniques and multiple improvements of the existing methods of manufacturing nanoparticles with tailored properties. Nanoparticles can be synthesized through a variety of physical and chemical methods. The choice of preparation procedure will depend on the physical and chemical characteristics required on the final product, such as size, dispersion, chemical miscibility, optical properties, among others. Here we review basic practical procedures used for the preparation of protected and unprotected metallic nanoparticles and describe a number of experimental procedures based on colloidal chemistry methods. These include gold nanoparticle synthesis by reduction with trisodium citrate, ascorbic acid, or sugars in aqueous phase; nanoparticle passivation with alkanethiols, cetyltrimethylammonium bromide, or bovin serum albumin. We also describe microwave-assisted synthesis, nanoparticle synthesis in ethylene glycol, template-assisted synthesis with dendrimers and briefly describe how to control nanoparticle shape (star-shaped and branched nanoparticles).

This review is concerned with the synthesis of metallic nanoparticles using plant extracts

The increasing impact of metallic nanoparticles in life sciences has stimulated the development of new techniques and multiple improvements of the existing methods of manufacturing nanoparticles with tailored properties. Nanoparticles can be synthesized through a variety of physical and chemical methods. The choice of preparation procedure will depend on the physical and chemical characteristics required on the final product, such as size, dispersion, chemical miscibility, optical properties, among others. Here we review basic practical procedures used for the preparation of protected and unprotected metallic nanoparticles and describe a number of experimental procedures based on colloidal chemistry methods. These include gold nanoparticle synthesis by reduction with trisodium citrate, ascorbic acid, or sugars in aqueous phase; nanoparticle passivation with alkanethiols, cetyltrimethylammonium bromide, or bovin serum albumin. We also describe microwave-assisted synthesis, nanoparticle synthesis in ethylene glycol, template-assisted synthesis with dendrimers and briefly describe how to control nanoparticle shape (star-shaped and branched nanoparticles).

Metal Nanoparticle Synthesis in Ionic Liquids | …

Nanometer-sized metal particles are synthesized and encapsulated into the interior of dendrimers by first mixing together the dendrimer and metal ion solution and then reducing the composite chemically, and the resulting dendrimer-encapsulated metal nanoparticles can then be used as catalysts.

Until very recently, metal aerogels did not exist. This is partly because there were (and still are) no known synthetic routes for producing wet gels of metals, although numerous synthetic routes for preparing solutions of metal nanoparticles (sols) do exist. In principle, if a gel composed of a network of metal nanoparticles could be prepared, it could also be supercritically dried to produce a metal aerogel. This said, like enlightenment and entropy, aerogel is a state function-it doesn’t matter how you get there but just that you do. The most consistent definition of aerogel implies that for a material to qualify as an aerogel, it must possess no less than 50% liquid-free porosity by volume and must be primarily mesoporous.

Metal Nanoparticles?Synthesis, ..

AB - The increasing impact of metallic nanoparticles in life sciences has stimulated the development of new techniques and multiple improvements of the existing methods of manufacturing nanoparticles with tailored properties. Nanoparticles can be synthesized through a variety of physical and chemical methods. The choice of preparation procedure will depend on the physical and chemical characteristics required on the final product, such as size, dispersion, chemical miscibility, optical properties, among others. Here we review basic practical procedures used for the preparation of protected and unprotected metallic nanoparticles and describe a number of experimental procedures based on colloidal chemistry methods. These include gold nanoparticle synthesis by reduction with trisodium citrate, ascorbic acid, or sugars in aqueous phase; nanoparticle passivation with alkanethiols, cetyltrimethylammonium bromide, or bovin serum albumin. We also describe microwave-assisted synthesis, nanoparticle synthesis in ethylene glycol, template-assisted synthesis with dendrimers and briefly describe how to control nanoparticle shape (star-shaped and branched nanoparticles).

The effects of different DNA molecules of the same length on the morphology of gold nanoparticles during synthesis are investigated. While spherical nanoparticles (AuNS) are observed in the presence of 30-mer poly T, like that in the absence of DNA, 30-mer poly A or poly C induces formation of the flower-shaped gold nanoparticle (AuNF). Detailed mechanistic studies indicate that the difference in DNA affinity to the AuNP plays a major role in the different morphology control processes. The DNA adsorbed on the AuNS surface could act as template to mediate the formation of flower-like gold nanoparticles. The formation of the AuNF can result from either selective deposition of the reduced gold metal on AuNS templated by surface bound DNA or uneven growth of the AuNS due to the binding of DNA to the surface. Furthermore, DNA functionalization with high stability was realized in situ during the one-step synthesis while retaining their biorecognition ability, allowing programmable assembly of new nanostructures. We have also shown that the DNA-functionalized nanoflowers can be readily uptaken by cells and visualized under dark-field microscopy.

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Green synthesis of metal nanoparticles using plants …

There are now a number of ways to make nanoporous metal foams that almost fit both criteria, however, and one way that unambiguously fits both. Here we will discuss the three major approaches:

most of the plants used in metal nanoparticle synthesis are ..

Recent breakthroughs on aerosol, combustion and reaction engineering sciences have placed dry synthesis of nanoparticles on a firm scientific basis, leading to novel functional materials in appreciable volumes at competitive prices. This has created renewed interest in dry processes and products.

Facile Synthesis of Graphene/Metal Nanoparticle …

Metal aerogels are potentially invaluable materials because they combine the unique properties of metals with the unique properties of aerogels. First, they would exhibit high specific surface areas (100-500 m2 g-1) and would be electrically conductive. This combination would make them valuable for applications where high-surface-area electrodes are needed, such as supercapacitors (sometimes called ultracapacitors), fuel cells, batteries, and water desalination. Secondly, nanosized particles of metals have been shown to exhibit enhanced catalytic activity overt bulk forms of the same metal. Gold, in fact, is very uncatalytic in the bulk, while gold nanoparticles very efficiently catalyze all sorts of nifty reactions, including room-temperature oxidation of carbon monoxide to carbon dioxide and carbon nanotube growth. Since metal aerogels would be composed of a three-dimensional network of nanosized metal particles, metal aerogels would thus be useful for making efficient, lightweight catalytic converters and useful in serving as catalytic substrates for other chemical reactions. Moreover, this means that metals like Fe or Ni could one day replace Pd, Rh, and Pt in catalytic converters, which are expensive and in diminishing supply.

Biosynthesis of Metal Nanoparticles: A Review - Hindawi

N2 - The effects of different DNA molecules of the same length on the morphology of gold nanoparticles during synthesis are investigated. While spherical nanoparticles (AuNS) are observed in the presence of 30-mer poly T, like that in the absence of DNA, 30-mer poly A or poly C induces formation of the flower-shaped gold nanoparticle (AuNF). Detailed mechanistic studies indicate that the difference in DNA affinity to the AuNP plays a major role in the different morphology control processes. The DNA adsorbed on the AuNS surface could act as template to mediate the formation of flower-like gold nanoparticles. The formation of the AuNF can result from either selective deposition of the reduced gold metal on AuNS templated by surface bound DNA or uneven growth of the AuNS due to the binding of DNA to the surface. Furthermore, DNA functionalization with high stability was realized in situ during the one-step synthesis while retaining their biorecognition ability, allowing programmable assembly of new nanostructures. We have also shown that the DNA-functionalized nanoflowers can be readily uptaken by cells and visualized under dark-field microscopy.

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