Preparation of silver nanoparticles in water-in-oil AOT reverse micelles

Zhang, Wanzhong; Qiao, Xueliang; Chen, Jianguo; Wang, Hongshui

doi:10.1016/j.jcis.2006.06.035

Cited by 146 publications

(100 citation statements)

References 11 publications

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“…Thus, the tiny particles are easy to aggregate into larger particles at the high silver nitrate concentration due to the weakened adsorption of AOT molecules on the particles' surface. Besides TEM micrograph, these conclusions have also been confirmed by the UV-vis spectra [51] . The primary study shows that the absorption intensity increases with increasing AgNO 3 concentration, which reflects the formation of more silver nanoparticles.…”

Section: Synthetic Approachessupporting

confidence: 61%

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

Capek¹,

Internationals²

2015

JNMS

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To manipulate the size of noble metal particles on a nanometer scale are priority subjects in the field of nanotechnology. So far various approaches have been developed to synthesize noble metal nanoparticles in controlled sizes and dimensions. Among them the colloidal systems become broadly used. These systems can be made up of several very different reactants and solvents: a continuous medium water or alkane, surfactant and precursor(s). In some systems the formation of (sub) nanoparticles is based on the supersaturation of solution by reactants. The existence of the microenvironments gives them a particular ability to modulate the chemical reactivity of the reactants due to their compartmentalization in different microenvironments. The size and shape of noble metal nanoparticles follow the feed composition of reactants in the precursor solution, the reaction conditions and concentration and type of reactants. Surface modification and functionalization is expected to increase the stability of nanoparticles and organize them to the assembly of higher order array conjugates. Various soft and hard templates can be applied to produce noble metal nanoparticles in different shaped nanoreactors. Monodisperse gold nano crystals can grow inside soft templates and the cavities of hard templates by the reduction of metal ions trapped in the cavities. The interesting optical properties of noble metal nanoparticles and their (bio)conjugates results from the strong absorption in the visible spectrum region, so called the surface plasmon absorption. Some noble metal nanoparticles have been studied for their antimicrobial potential and have proven to be antibacterial and antiviral agents.

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Section: Synthetic Approachessupporting

confidence: 61%

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

Capek¹,

Internationals²

2015

JNMS

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“…Emulsified aqueous droplets solubilized silver precursor (silver nitrate) and reducing agent (hydrazine hydrate) (Zhang et al, 2006;Zhang et al, 2007;He et al, 2004). Collision and coalescence of these microemulsion droplets started the reduction of silver precursor and the formation of silver oligomers and primary silver nanoparticles.…”

Section: Preparation Of Gold and Silver Nanoparticlesmentioning

confidence: 99%

Noble Metal Nanoparticles and Their (Bio) Conjugates. I. Preparation

Capek¹

2016

IJC

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Noble metal nanoparticles are important subjects in the field of nanotechnology. Various synthetic processes have been summarized and discussed for the preparation of noble metal nanoparticles of different sizes, shapes and solubility. Among them the colloidal fluids are most fascinating. The formation of nanoparticles starts by the reduction of metal salt and continue with the agglomeration of metal atoms to embryos, subnanoparticles and to premature metal nanoparticles. The existence of the microenvironments in the colloidal systems gives nanoparticles unique reactivity towards various molecules and additives. A soft template can be applied to synthesize noble metal nanoparticles in different-shaped biomolecules-based nanoreactors, micelles and liposomes. The size and shape of nanoparticles follows reactant feed composition, reaction conditions, presence or absence of template and type and concentration of reactants.

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“…Zhang et al (Zhang et al, 2007;Zhang et al, 2006) reported that silver nanoparticles prepared in AOT microemulsion have a smaller average size and narrower size distribution compared to the particles prepared using cationic or nonionic surfactant in the microemulsion system (Zhang et al, 2007). In addition, due to the adsorption of AOT molecules onto the particles, the resultant sol can be preserved for a long time without precipitation and it easily transfers the obtained nanoparticles into nonpolar solvents (Zhang et al, 2006).…”

Section: Fig 2 Model Of Surfactant Molecule Bis(2-ethylhexyl)sulfosmentioning

confidence: 99%

“…In addition, due to the adsorption of AOT molecules onto the particles, the resultant sol can be preserved for a long time without precipitation and it easily transfers the obtained nanoparticles into nonpolar solvents (Zhang et al, 2006).…”

Section: Fig 2 Model Of Surfactant Molecule Bis(2-ethylhexyl)sulfosmentioning

confidence: 99%