Formation of Supramolecular Fibril by Water-Soluble Azo Dye

Abstract

The ternary azo dye/water/methanol systems were investigated by polarized microscopic and smallangle neutron scattering methods. The formation and structures of supramolecular self-assemblies were discussed in relation to methanol content in isotropic and anisotropic systems. Stripelike assemblies and their piles were constructed in the systems with low methanol content. On the other hand, fibrils having linear molecular arrangement and their bundles were formed at high methanol content. Moreover, liquid crystals in anisotropic gels consisted of an organization of stripes or fibrils. Absorption spectra were measured in order to confirm the formation of supramolecular assemblies.

Water‐Soluble Methyl Orange Fibrils as Versatile Templates for the Fabrication of Conducting Polymer Microtubules

“…Actually, water-soluble azo dye has already been found to be capable of forming supramolecular fibril in previous studies. [19] This precipitate obtained in the acidic aqueous solution of MO is a congenital candidate to be used as the template for preparing conducting polymer microtubules because it possesses several advantages: (1) onedimensional fibrillar microstructure in the acidic condition, which is required for the polymerization of most of the conducting polymers; (2) availability of the sulfonic groups in MO molecules that provide active sites for the polymerization process as well as serve as a dopant; [20] (3) easy dissolution in water, which will neither alter nor destroy the microstructures of the resulting materials; (4) possibility for mass production of exclusive microtubular structures of conducting polymers; (5) the potential to be fit for different systems.…”

Coaggregation of Two Anionic Azo Dyestuffs: A Combined Static Light Scattering and Small-Angle X-ray Scattering Study

“…Anionic azo dyestuffs form fiberlike aggregates in aqueous solution, 1 which resembles the formation of protein aggregates. Although proteins are usually much larger than anionic azo dyestuff molecules, they bear striking similarities with the latter.…”

Formation of supramolecular hydrogels with controlled microstructures and stability via molecular assembling in a two-component system

“…It is well known that hydrogen bonds play an important role in organisms and become a common driving force for intermolecular aggregation in organogel systems [17]. Due to the destructing by water molecules, hydrogen bonds have seldom been designed into hydrogel systems [18,19]. It has been well known that many simple organic molecules form stable crystals in water based on hydrogen bonds as the driving force.…”