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Cylindrical Micelles (cylindrical + micelle)

Distribution by Scientific Domains

Polymers and Materials Science	80%

Selected Abstracts

Fabrication of Continuous and Segmented Polymer/Metal Oxide Nanowires Using Cylindrical Micelles and Block Comicelles as Templates

ADVANCED MATERIALS, Issue 18 2009
Hai Wang
Cylindrical micelles were added as templates to sol,gel reaction mixtures to yield highly elongated polymer/inorganic nanostructures with smooth nanothin surface coatings of silica, zirconia, or alumina. Differences in the templating activity of neutral or cationic coronas can be exploited by using triblock comicelles to produce discrete nanocylinders with spatially isolated domains of titania surface deposition. [source]

Hydrophobic Functional Group Initiated Helical Mesostructured Silica for Controlled Drug Release,

ADVANCED FUNCTIONAL MATERIALS, Issue 23 2008
Lei Zhang
Abstract In this paper a novel one-step synthetic pathway that controls both functionality and morphology of functionalized periodic helical mesostructured silicas by the co-condensation of tetraethoxysilane and hydrophobic organoalkoxysilane using achiral surfactants as templates is reported. In contrast to previous methods, the hydrophobic interaction between hydrophobic functional groups and the surfactant as well as the intercalation of hydrophobic groups into the micelles are proposed to lead to the formation of helical mesostructures. This study demonstrates that hydrophobic interaction and intercalation can promote the production of long cylindrical micelles, and that the formation of helical rod-like morphology is attributed to the spiral transformation from bundles of hexagonally-arrayed and straight rod-like composite micelles due to the reduction in surface free energy. It is also revealed that small amounts of mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, and phenyltrimethoxysilane can cause the formation of helical mesostructures. Furthermore, the helical mesostructured silicas are employed as drug carriers for the release study of the model drug aspirin, and the results show that the drug release rate can be controlled by the morphology and helicity of the materials. [source]

Solution self-assembly of tailor-made macromolecular building blocks prepared by controlled radical polymerization techniques

POLYMER INTERNATIONAL, Issue 9 2006
Jean-François Lutz
Abstract This review describes the preparation of colloidal aggregates (spherical micelles, cylindrical micelles, polymer vesicles, multicompartment micelles, polyion complexes, schizophrenic micelles) using bottom-up self-assembly approaches. In particular, it focuses primarily on the self-organization of well-defined macromolecular building blocks (macrosurfactants, polysoaps, polyelectrolytes) synthesized by controlled radical polymerization techniques such as atom transfer radical polymerization, reversible addition fragmentation transfer polymerization and nitroxide-mediated polymerization. The goal of this review is to highlight that these versatile techniques of polymer synthesis allow the preparation of unprecedented nanostructures in dilute solutions. Copyright © 2006 Society of Chemical Industry [source]

Supramolecular Self-Assembly of Conjugated Diblock Copolymers

CHEMISTRY - A EUROPEAN JOURNAL, Issue 4 2004
Hengbin Wang Dr.
Abstract This paper describes the synthesis and characterization of a novel series of copolymers with different lengths of oligo(phenylene vinylene) (OPV) as the rod block, and poly(propylene oxide) as the coil block. Detailed characterization by means of transmission electron microscopy (TEM), atomic force microscopy (AFM), and small-angle neutron scattering (SANS) revealed the strong tendency of these copolymers to self-assemble into cylindrical micelles in solution and as-casted films on a nanometer scale. These micelles have a cylindrical OPV core surrounded by a poly(propylene glycol) (PPG) corona and readily align with each other to form parallel packed structures when mica is used as the substrate. A packing model has been proposed for these cylindrical micelles. [source]