12 research outputs found
Light-induced ostwald ripening of organic nanodots to rods
Ostwald ripening allows the synthesis of 1D nanorods of metal and semiconductor nanoparticles. However, this phenomenon is unsuccessful with organic Ï-systems due to their spontaneous self-assembly to elongated fibers or tapes. Here we demonstrate the uses of light as a versatile tool to control the ripening of amorphous organic nanodots (ca. 15 nm) of an azobenzene-derived molecular assembly to micrometer-sized supramolecular rods. A surface-confined dipole variation associated with a low-yield (13â14%) transâcis isomerization of the azobenzene moiety and the consequent dipoleâdipole interaction in a nonpolar solvent is believed to be the driving force for the ripening of the nanodots to rods
Role of complementary H-bonding interaction of a cyanurate in the self-assembly and gelation of melamine linked tri(p-phenyleneethynylene)s
Melamine-functionalized tri(p-phenyleneethynylene) 1 self-assembles to form opaque and weak gels in aliphatic solvents which turned transparent and stable upon addition of a cyanurate, affording supramolecular nanostructures with distinct physical properties
Light-Induced Ostwald Ripening of Organic Nanodots to Rods
Ostwald ripening allows the synthesis of 1D nanorods
of metal and
semiconductor nanoparticles. However, this phenomenon is unsuccessful
with organic Ï-systems due to their spontaneous self-assembly
to elongated fibers or tapes. Here we demonstrate the uses of light
as a versatile tool to control the ripening of amorphous organic nanodots
(ca. 15 nm) of an azobenzene-derived molecular assembly to micrometer-sized
supramolecular rods. A surface-confined dipole variation associated
with a low-yield (13â14%) <i>transâcis</i> isomerization of the azobenzene moiety and the consequent dipoleâdipole
interaction in a nonpolar solvent is believed to be the driving force
for the ripening of the nanodots to rods