Adsorption of pseudoisocyanine on silver bromide nanoparticles: Effect on the stability of the particles

✍ Scribed by Laurence Jeunieau; Janos B. Nagy

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 151 KB
• Volume: 12
• Category: Article
• ISSN: 0268-2605
• DOI: 10.1002/(sici)1099-0739(199805)12:5<341::aid-aoc727>3.0.co;2-3

✦ Synopsis

Pseudoisocyanine (PIC) was adsorbed on colloidal silver halide nanoparticles where it formed aggregates (J-aggregates). The nanoparticles were prepared using a surfactant (AOT)/nheptane/water microemulsion. The molecules of pseudoisocyanine replaced the molecules of surfactant (AOT) on the surface of the nanoparticles and caused an instability of the silver bromide dispersion. The stability could be improved by two methods: either by using an adsorption inhibitor (e.g. p-xylene) or by adding another surfactant (CTAB). The adsorption has also been carried out at low temperature: the stability of the particles was then improved, and the J-aggregates are smaller.