Ring Formation in Evaporating Porphyrin Derivative Solutions

Abstract

The formation of micrometer-size, ring-shaped structures is studied in evaporating solutions of porphyrin-based molecules on glass. Solute concentration, solution and substrate temperature, vapor pressure, and solvent are varied. The molecular arrangements on the substrate are monitored by confocal fluorescence microscopy (CFM), atomic force microscopy (AFM), and near-field scanning optical microscopy (NSOM). From experiment, a nonequilibrium morphology diagram for the observed structures is deduced as a function of solute concentration and evaporation time. The mechanisms involved in ring formation are discussed on the basis of solvent and solute dynamics.

Microscopic determination of tetracycline based on aluminum-sensitized fluorescence of a self-ordered ring formed by a sessile droplet on glass slide support

“…11.71 m when 4 × object was used). This Gaussian distribution of the molecules on the SOR is identical to the report of other authors [30], and the deposition process depends on the initial concentration of the solution and the profile of the shrinking droplet. As Fig.…”

Two-dimensional “nano-ring and nano-crystal” morphologies in Langmuir monolayer of phthalocyaninato nickel complexes

“…This relates with the ring formation mechanism. Nanorings of porphyrin compounds have been fabricated from the organic or inorganic solvents [36][37][38][39]. An evaporation-driven solute transport mechanism was suggested for the nano-ring formation from the evaporation of organic solvents [38].…”

Ellipsometric characterization of hybrid samples composed of iron porphyrin on Si

“…The morphology of hybrid samples was studied by a standard atomic force microscopy (AFM) technique (Thermomicroscope Explorer). On the basis of these observations, several typical structural features were determined: (i) the presence of contact line at the boundary of the dried drop of FeTPPS aqueous solution, (ii) formation of macro-and nano-aggregates, (iii) occurrence of micrometre-size rings typical of porphyrin and its derivatives [9]. The morphology of the structures on the surface of hybrid samples was quite similar in all the samples under consideration.…”