Preparation of Highly-concentrated Contact-free Silver Nanoparticles by Aerosol Process

Abstract

Highly concentrated state (10₂₁-10₂₂ particles/m₃) could be achieved in hexane for particles with 2.7nm mean diameter without aggregation by the gas flow-cold trap method combined with cationic surfactants such as (2-dodecylhexadecyl)trimethylammonium chloride (g-C28TAC). The preservation of the particle size distribution in the concentrating and drying process was confirmed by electron microscopy. However, the particle size changed during the processing in case of anionic surfactants such as sodium 1, 2-bis (2-ethylhexyloxy carbonyl) ethanesulfonate. Contact-free silver clusters with 1nm diameter could be prepared in hexane with g-C28TAC by a modified gas cold trap method.