Formation of silver iodide particles from thermodynamically stable clusters using ultrasonic spray pyrolysis (original) (raw)
Related papers
2010
Nanostructures of AgI are prepared by reaction between AgNO3 and KI under ultrasound irradiation. Some of parameters such as effect of stirring, temperature, sonicating time in growth and morphology of the nano-structures are studied. The size distribution depends slightly on reaction conditions. But morphology of nano-structure depends strongly on reaction parameters. With change of solvent concentration and sonicating time, nanoparticles structures changed to nanowires. An increasing of temperature results in an increasing of solubility. As a result, nuclei with small sizes become unstable and dissolve back into the solution. Attendance or non-attendance of stirring is another parameter that effects on morphology of nano-structures. In some conditions, non-attendance of stirring led to nanowires structure and in the other conditions, nanoparticles structures are prepared. The samples are characterized with powder X-ray diffraction (XRD), scanning electron microscopy (SEM).
Solid State Ionics, 2006
AgI nanoparticles were prepared by solution-based routes using water-soluble anionic or cationic polyelectrolytes as capping agents. Depending on the polyelectrolytes, AgI nanoparticles with well-defined morphology, size, and phase compositions were obtained: the use of poly (sodium 4-styrenesulfonate) (PSS) resulted in AgI nano-rods of β-AgI in wurtzite structure (2H); with poly(acrylic acid sodium salt) (PAS) truncated-tetrahedron shaped γ-AgI nanoparticles (nanotetrahedra) in zinc-blende structure (3C) were obtained; by employing poly (diallyldimethylammonium chloride) (PDADMAC) plate-like AgI nanoparticles (nano-plates) consisting of unusual polytype phases of AgI (7H and 9R) were formed. Macroscopically unstable γ-AgI and 7H and 9R phases could be stabilized in the form of nanocrystalline powders. They transform reversibly into the high temperature α-AgI phase and exhibit unusually high ionic conductivity and substantially smaller transformation enthalpy values compared to the macroscopic β-AgI.
Silver Nanoparticles from Ultrasonic Spray Pyrolysis of Aqueous Silver Nitrate
Aerosol Science and Technology, 2005
Silver particles less than 20 nm in diameter were synthesized by pyrolysis of an ultrasonically atomized spray of highly dilute aqueous silver nitrate solution at temperatures above 650 • C and below the melting point of silver. Feed solution concentration and ultrasound power applied to the atomizer were found to have a significant impact on the particle size of the silver nanoparticles. Average particle size was found to be controllable in the range of 20 nm to 300 nm by varying the solution concentration and the ultrasound power to the atomizer.
Influence of adsorbing species on properties of equilibrium silver iodide clusters
Journal of colloid and interface science, 2004
Thermodynamically stable AgI clusters were studied in the presence of high-and low-molecular-weight additives: polyethyleneimine (PEI) and dimethylformamide (DMF), respectively. Clusters containing up to 20 silver iodide pairs, roughly twice as many as in the system without PEI or DMF, have been observed. We show that the mechanism stabilizing these clusters is mixed adsorption with iodide ions at the AgI-electrolyte interface. We make it plausible that more strongly adsorbing additives give rise to ultralow interfacial tensions of the AgI-electrolyte interface, with perspectives for "reversible colloids."
Solid silver particle production by spray pyrolysis
Journal of Aerosol Science, 1993
Solid, spherical, micron-sized silver metal particles were produced by spray pyrolysis from a silver nitrate solution. The effects of reaction temperature, carder gas type, solution concentration, and aerosol droplet size on the characteristics of the resultant silver particles were examined. Pure, dense, unagglomerated particles were produced with an ultrasonic generator at and above 600 ° C using Nz carder gas, and at and above 900°C using air as the carrier gas. Solid particle formation at temperatures below the melting point of silver (962°C) was attributed to sufficiently long residence times (3.5-54 s) which allowed aerosol-phase densification of the porous silver particles resulting from reaction of the precursor.
A MINI REVIEW ON PREPARATION, CHARACTERIZATION, AND APPLICATIONS OF SILVER IODIDE NANOPARTICLES
Asian Journal of Pharmaceutical and Clinical Research, 2021
The synthesis of silver iodide nanoparticles for variety of applications such as photocatalyst and antibacterial properties has attracted broad interest due to the extraordinary properties of these materials. The preparation of silver iodide nanoparticles through a physical or chemical reduction process is the most common methodology applied to obtain nanoparticles with the required size, shape, and surface morphology. This review paper discusses the details concerning the past and recent advancement of the synthesis and characterization of silver iodide nanoparticles and also composite silver iodide/carbon nanotubes nanoparticles. A review on the advantages of various techniques, which aim to achieve the photo catalyst and antibacterial properties is also included. A brief summary concerning the recent challenges and improvement approaches is presented at the end of this review.
Journal of Colloid and Interface Science, 2005
Uniform, well-dispersed silver particles of various morphologies have been prepared by reducing highly acidic silver nitrate solutions with ascorbic acid in the presence of a sodium naphthalene sulfonate-formaldehyde copolymer as dispersing agent. By varying the temperature of the reaction, the free acid content, the addition rate of the reductant, and the aging time, both isometric and anisotropic silver particles could be obtained. It was found that the latter were formed by aggregation of nanosize subunits, which were identified by electron microscopy and X-ray diffractometry.
Nucleation and growth of silver nanoparticles monitored by titration microcalorimetry
Journal of Thermal Analysis and Calorimetry, 2005
In this work, we report synthesis strategies to produce Ag nanoparticles by AB-type and ABC-type atomic layer deposition (ALD) using trimethylphosphine-(hexafluoroacetylacetonato) silver(I) ((hfac)Ag(PMe 3 )) and formalin (AB-type) and (hfac)Ag(PMe 3 ), trimethylaluminum, and H 2 O (ABC-type). In situ quartz crystal microbalance measurements reveal a Ag growth rate of 1−2 ng/cm 2 /cycle by ABC-type ALD at 110°C and 2−10 ng/cm 2 /cycle for AB-type ALD at 170−200°C. AB-type Ag ALD has a nucleation period before continuous linear growth that is shorter at 200°C. Transmission electron microscopy reveals that AB-type Ag ALD particles have an average size of ∼1.8 nm after 10 cycles. ABC-type Ag ALD particles have an average size of ∼2.2 nm after 20 cycles. With increasing ALD cycles, ABC-type Ag ALD increases the metal loading while maintaining the particle size but AB-type Ag ALD results in the formation of bigger particles in addition to small particles. The ability to synthesize supported metal nanoparticles with well-defined particle sizes and narrow size distributions makes ALD an attractive synthesis method compared to conventional wet chemistry techniques.
Synthesis and Characterization of AgCl Nanoparticles Under Various Solvents by Ultrasound Method
Journal of Inorganic and Organometallic Polymers and Materials, 2012
Nano-structures of AgCl have been prepared by reaction between AgNO 3 and KCl under ultrasound irradiation. Particle sizes and morphology of nanoparticle are depending on temperature and reaction time. The effects of these parameters in growth and morphology of the nanostructures have been studied. The solvents have noticeable influences on the morphology of the silver chloride particles. With an increase in the temperature and reaction time, growth toke place on more nuclei. As a result, an increase in temperature and reaction time led to increase of particle size. The physicochemical properties of the nanoparticles were determined by X-ray diffraction and scanning electron microscopy.