Time-Resolved Structured Illumination Microscopy for Phase Separation Dynamics of Water and 2-Butoxyethanol Mixtures: Interpretation of 'Early Stage' Involving Micelle-Like Structures
| Autor: | Shuichi Toyouchi, Masatoshi Toda, Toshihiro Kawakatsu, Yohji Akama, Motoko Kotani, Hiroshi Fukumura, Shinji Kajimoto |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Dynamics (mechanics) Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Fluorescence Micelle Light scattering Surfaces Coatings and Films chemistry.chemical_compound chemistry Temperature jump 0103 physical sciences 2-Butoxyethanol Materials Chemistry Molecule Stage (hydrology) Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry B. 122:12375-12385 |
| ISSN: | 1520-5207 1520-6106 |
| Popis: | Phase separation dynamics of a water/2-butoxyethanol (2BE) mixture was studied with newly developed time-resolved structured illumination microscopy (SIM). Interestingly, an employed hydrophobic fluorescent probe for SIM showed spectral shifts up to 500 ns after a laser-induced temperature jump, which suggests 2BE micellar-like aggregates become more hydrophobic at the initial stage of phase separation. This hydrophobic environment in 2BE aggregates, probably due to the ejection of water molecules, continued up to at least 10 μs. Time-resolved SIM and previously reported light scattering data clearly showed that the size of a periodic structure remained constant (ca. 300 nm) from 3 to 10 μs, and then the growth of periodic structures having the self-similarity started. We think that the former and the latter processes correspond to "early stage" (concentration growth) and "late stage" (size growth), respectively, in phase separation dynamics. Here we suggest that, in the early stage, the entity to bear 2BE phase be water-poor 2BE aggregates, and the number density of these aggregates would simply increase in time. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|