Formation of Colloidal Gold Nanoparticles in an Ultrasonic Field:  Control of Rate of Gold(III) Reduction and Size of Formed Gold Particles

Abstract

Gold(III) (tetrachloroaurate(III)) was reduced in an aqueous solution containing only a small amount of 2-propanol to form colloidal gold nanoparticles in a standing wave system generated by a 200 kHz ultrasonic generator. The rates of gold(III) reduction and the sizes of the formed gold particles could be sonochemically controlled by controlling the irradiation parameters such as the temperature of the solution, the intensity of the ultrasound, and the positioning of the reactor. The size of gold particles strongly depended on the rate of gold(III) reduction, suggesting that the rate of gold(III) reduction affects the initial nucleation of the gold particles.

Fabrication of gold nanoparticles with different morphologies in HEPES buffer

“…In literature, there are numerous physical and chemical methods of generating gold nanoparticles [22][23][24][25]. Among the reported methods, the reduction of HAuCl 4 by using reducing agents such as sodium citrate, sodium borohydride, hydrazine, and dimethyl formamide is the common used method for preparation of gold nanoparticles.…”

Konjac Biomolecules Assisted–Rod/Spherical Shaped Lead Nano Powder Synthesized by Electrolytic Process and Its Characterization Studies

“…Nanoparticles are being synthesized in various methods including electrolysis and many irradiation methods such as sonochemical [1], UV or vis photoirradiation [2], laser pulse [3] and γ-irradiation methods [4] and so forth. When nanomaterials interact with biological systems, their properties are changed significantly, affecting their functionality and behavior.…”

Selective Synthesis of Gold Nanoparticles in Water/Alcohol Binary Solution Systems by Ultrasonic Irradiation

“…As a factor which contribute to the present results, we conduct experiments under ultrasonic irradiation in this work. Under this condition, some radicals in the cavitation are known to be produced from the solvent in high-temperature and high-pressure reaction sites [14][15][16]. In case of the present systems, water molecules or alcohol molecules undergo homolytic cleavage and form ·OH and H· radicals.…”