Creation of new two-dimensional (2D) architectures has attracted significant attention in the field of selfassembly for structural diversity and new functionalization. Although numerous 2D polymer nanosheets have been reported, 2D nanosheets with tubular channels have been unexplored. Herein, we describe a new strategy for the fabrication of stimulus-responsive conjugated polymer 2D nanosheets with hollow cavities. Amphiphilic macrocyclic diacetylenes self-assembled in an aqueous solution in a columnar manner to afford bilayered 2D nanosheets with intrinsically tubular nanochannels. UV-induced polymerization resulted in the generation of blue-colored tubular conjugated polydiacetylene 2D nanosheets. Immobilization of gold nanoparticles, fluorescence labeling with FRET phenomenon and colorimetric DNA sensing were demonstrated with these new 2D nanosheets. In addition, the free NH 2 containing polymerized 2D nanosheet was utilized for conductivity behavior and grafting on graphene oxide (GO).
A new flexible layered material was generated from macrocycles containing functional, flexible, and intercalating units. The layered macrocycles exhibit thermoresponsive color changes in a wide temperature range.
High-resolution
structures are crucial for understanding
the functional
properties of nanomaterials. We applied single-particle cryo-electron
microscopy (cryo-EM), a method traditionally used for structure determination
of biological macromolecules, to obtain high-resolution structures
of synthetic non-biological filaments formed by photopolymerization
of macrocyclic diacetylene (MDA) amphiphilic monomers. Tomographic
analysis showed that the MDA monomers self-assemble into hollow nanotubes
upon dispersion in water. Single-particle analysis revealed tubes
consisting of six pairs of covalently bonded filaments held together
by hydrophobic interactions, where each filament is composed of macrocyclic
rings stacked in parallel “chair” conformations. The
hollow MDA nanotube structures we found may account for the efficient
scavenging of amphiphilic pollutants in water and subsequent photodegradation
of the guest species.
Determination of acetic anhydride and acetic acid concentrations in the distillate withdrawn from the distillation columnA mixture of acetic acid and acetic anhydride was charged in the reactor and subjected to distillation with total reflux. The mole fraction of acetic acid in the reflux was determined by using a refractometer (ATAGO, Model 3T) and a gas-chromatograph (Hewlett Packard,
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