ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We have observed dramatic delays in the formation of the liquid-condensed phase of 1-octadecanol thin films on the surface of levitated water drops as the drops evaporate into a flowing gas stream. When the aqueous substrate starts with more than 1.0×10−4 M Eu3+ (EDTA), the liquid-condensed phase of 1-octadecanol appears, as expected, at a surface concentration equivalent to one monolayer. As we reduce the initial Eu3+ (EDTA) content, higher and higher surface concentrations of 1-octadecanol are reached prior to the appearance of the liquid-condensed phase. At initial concentrations of Eu3+ (EDTA) below ∼4.0×10−7 M, the average surface concentration at the liquid-condensed phase change exceeds ten monolayers. Light-scattering data attest to the presence of small, 〈400 nm radius, 1-octadecanol particles initially dispersed throughout the substrate. We demonstrate that these particles are collected by the shrinking drop surface with minimal diffusion of the particles to the surface.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.466417
Permalink