We
studied the phase behavior of a ternary polymerizable gemini
surfactant (PC11-6-11)/1-undecanol/water system and stabilized these
liquid crystalline structures through the polymerization of surfactants.
The addition of 1-undecanol to a PC11-6-11/water system formed bicontinuous
cubic (V1) and reversed hexagonal (H2) liquid
crystal phases in addition to hexagonal (H1) and lamellar
(Lα) phases, which were also formed using the binary
system of PC11-6-11/water. These new phases were formed because the
fatty alcohol penetrated the palisade layer of the PC11-6-11 micelles.
The polymerization of PC11-6-11 with a thermal initiator successfully
preserved the Lα and H2 phases. Layered
or honeycomb structures of these liquid crystals were clearly observed
by transmission electron microscopy. The nanomaterials have potential
applications as membranes for nano- or microfiltration and catalyst
support materials.
In order to create novel vapochromic fluorescent amorphous molecular materials, title compound (BBMP) was synthesized and its emitting properties in solid states were investigated as well as in solution. It was found that BBMP exhibit solvatochromic fluorescence. BBMP was also found to exhibit fluorescence in solid states, the spectrum depending upon the morphology, and to exhibit mechanochromic fluorescence due to formation of glassy state by grinding the crystalline sample. And finally, BBMP film was found to exhibit vapochromic fluorescence. Two triphenylamine moieties with different structures in a BBMP molecule might play an important role for the difference between emitting properties in solution and in solid states.
Effects of polymerizable groups on aqueous phase behavior of monomeric and gemini surfactants have been studied on the basis of visual appearance, polarized optical microscopy (POM), and small angle X-ray scattering (SAXS) data. Three phases were observed for nonpolymerizable monomeric (UTAB), polymerizable monomeric (PC11), and non-polymerizable gemini (11-6-11) surfactants: micellar solution (Wm), hexagonal (H1), and lamellar gel (Lβ) phases. In the case of a polymerizable gemini surfactant (PC11-6-11), we saw a lamellar liquid crystal (Lα) phase between the H1 and Lβ phases (i.e., Wm-H1-Lα-Lβ phase transition). Polymerizable groups covalently bound to the terminal hydrocarbon chains resulted in an increased Wm-H1 phase transition concentration for both the monomeric and gemini surfactants. It seems that this is due to the loosely packed hydrocarbon chains of the polymerizable surfactants in their molecular aggregates. We also found that the gemini surfactants yield a lower Wm-H1 phase transition concentration (in mol/L) than the monomeric ones, as a result of an increased critical packing parameter and/or an increased hydrophobicity of the gemini surfactants.
A hybrid film of poly(vinyl acetate) and tetrabutylphosphonium tetrafluoroborate together with 4-[bis(4-methylphenyl)amino]benzaldehyde as a fluorescent dopant was fabricated. It was found that the film exhibited thermally reversible phase-separation and dissolution transitions and that both homogeneous and phase-separated states could be obtained at room temperature by appropriate thermal treatments. In addition, emission modulation of the film was achieved by using the phase-separation-dissolution transitions. Fluorescence properties including fluorescence life times and quantum yields in homogeneous film seemed to be unchanged by phase separation, suggesting that no significant change in the surrounding environment of the dopant molecules took place by phase-separationdissolution cycles. Therefore, the emission modulation observed here was suggested to be due to mainly the change in the light-scattering effect caused by phase transitions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.