Preparation and stability of silver/kerosene nanofluids

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Silver nanoparticles (AgNPs) offer unique properties but require stabilization for fluid applications.
• Dithiophosphate coatings provide dispersity and stability in hydrocarbon-based fluids.
• Understanding AgNP interactions with fuels is crucial for advanced applications.

Purpose of the Study:

• To synthesize and characterize silver nanoparticles coated with various dithiophosphates.
• To evaluate the stability and thermal properties of silver nanofluids in alkanes and kerosene.
• To investigate the impact of these silver nanoparticles on the thermal oxidation of kerosene.

Main Methods:

• Synthesis of silver nanoparticles with di-n-dodecyldithiophosphate, di-n-cetyldithiophosphate, and di-n-octadecyldithiophosphate coatings.
• Preparation of stable silver nanofluids in alkane and kerosene bases.
• Measurement of thermal stability of nanofluids at elevated temperatures.
• Analysis of the effects of silver nanoparticles on kerosene thermal oxidation.

Main Results:

• Successfully prepared silver nanoparticles with good dispersity in alkanes and kerosene.
• Formed stable silver nanofluids with enhanced thermal stability.
• Observed inhibition of kerosene thermal oxidation at temperatures above 150°C.
• Demonstrated release of dithiophosphate coatings above 150°C, enabling oxygen access to silver and oxidation inhibition.

Conclusions:

• Dithiophosphate-coated silver nanoparticles form stable nanofluids in hydrocarbon bases.
• These nanofluids exhibit improved thermal stability.
• The nanoparticles effectively inhibit kerosene thermal oxidation at elevated temperatures through a coating release mechanism.