Structural, electrical, and rheological properties of palladium/silver bimetallic nanoparticles prepared by conventional and ultrasonic-assisted reduction methods

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Japan, 2014-03, Vol.25 (2), p.801-810
• Main Authors: Azizi-Toupkanloo, Hossein, Goharshadi, Elaheh K., Nancarrow, Paul
• Format: Article
• Language: English
• Subjects: Alloy structure; Bimetallic nanoparticles; Electrical properties; Rheological behavior; Ultrasonic
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2013.11.015

[Display omitted] •Synthesis of Pd/Ag bimetallic NPs using ultrasound-assisted reduction method.•31.58% increase in viscosity of EG by adding 5% Pd/Ag NPs at 20°C.•3841% increase in electrical conductivity of DW by suspending 1% Pd/Ag NPs at 25°C. Polyvinylpyrrolidone stabilized Pd/Ag bimetallic nanoparticles (NPs) with average particle sizes of 9 and 6nm were synthesized by simultaneous reduction in the presence and absence of ultrasound waves, respectively. The prepared NPs were characterized by six methods including X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution-TEM (HRTEM), UV–vis spectroscopy, scanning tunneling microscopy (STM), and energy dispersive X-ray (EDX) analysis. The rheological properties of Pd/Ag NPs in ethylene glycol as a base fluid with various mass fractions of NPs from 2% to 5% at different temperatures were studied experimentally and theoretically. The experimental results showed that viscosity of Pd/Ag NPs in ethylene glycol increases with increasing particle mass fraction and decreases with increasing temperature. A maximum of 31.58% increase in viscosity of ethylene glycol at 20°C was observed when 5% Pd/Ag NPs was added. Measurement of the electrical conductivity of nanofluids of Pd/Ag bimetallic NPs in distilled water at different mass fractions and temperatures was performed. A 3841% increase in electrical conductivity of distilled water at 25°C was observed when 1% Pd/Ag NPs was added. Both the rheological and electrical properties of Pd/Ag bimetallic NPs were measured in ethylene glycol and distilled water, respectively for the first time.