Effect of temperature and humidity on coarsening behavior of Au nanoparticles embedded in liquid crystalline lipid membrane.
Summary of "Effect of temperature and humidity on coarsening behavior of Au nanoparticles embedded in liquid crystalline lipid membrane."
Coarsening behavior of the Au nanoparticles produced by direct deposition of Au onto a liquid crystalline lipid (1,2-dioleoyl-3-trimethylammonium-propane, DOTAP) membrane was investigated by subjecting the nanoparticle-embedded DOTAP membrane under two different conditions (at 100 °C under no humidity and at 20 °C and 80 % relative humidity). Although the relatively low temperatures substantially slowed the coarsening rate (from 5.6 nm in the as-deposited state to ~ 7 nm after 30 h), it was identified that high temperature without humidity resulted in shape refinement whereas humidity alone induced self-organization of the nanoparticles into a monolayer. It was also found that annealing in both cases tended to segregate the lipid molecules from the nanoparticle array and forced the nanoparticles into a tighter area. In the case of the high-humidity sample, the lipid segregation eventually led to massive coalescence of the nanoparticles because the monolayer configuration accelerated the particle-to-particle impingement. We were also able to improve the ordering of the Au nanoparticle in a regular superlattice by combining two different annealing characteristics of the Au nanoparticles embedded in a lipid membrane.
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
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