| |||
Bottom-up Fabrication (bottom-up + fabrication)
Selected AbstractsBottom-Up Fabrication of Photonic Defect Structures in Cholesteric Liquid Crystals Based on Laser-Assisted Modification of the Helix,ADVANCED MATERIALS, Issue 9 2007H. Yoshida Controlled fabrication of defect structures is performed in cholesteric liquid crystals by a laser-assisted polymerization process that induces a local elongation of the helix (see figure). Low-threshold laser action is observed from the photonic defect-mode observed within the selective reflection band. [source] Self-Assembly of Nanosize Coordination Cages on Si(100) SurfacesCHEMISTRY - A EUROPEAN JOURNAL, Issue 24 2007Marco Busi Dr. Abstract Bottom-up fabrication of 3D organic nanostructures on Si(100) surfaces has been achieved by a two-step procedure. Tetradentate cavitand 1 was grafted on the Si surface together with 1-octene (Oct) as a spatial spectator by photochemical hydrosilylation. Ligand exchange between grafted cavitand 1 and self-assembled homocage 2, derived from cavitand 5 bearing a fluorescence marker, led to the formation of coordination cages on Si(100). Formation, quantification, and distribution of the nanoscale molecular containers on a silicon surface was assessed by using three complementary analytical techniques (AFM, XPS, and fluorescence) and validated by control experiments on cavitand-free silicon surfaces. Interestingly, the fluorescence of pyrene at ,4,nm above the Si(100) surface can be clearly observed. [source] Selective Formation of Bi-Component Arrays Through H-Bonding of Multivalent Molecular ModulesADVANCED FUNCTIONAL MATERIALS, Issue 8 2009Luc Piot Abstract Here, the formation of discrete supramolecular mono- and bi-component architectures from novel and multivalent molecular modules bearing complementary recognition moieties that are prone to undergo multiple H-bonds, such as 2,6-di(acetylamino)pyridine and uracil residues, is described. These nanostructured H-bonded arrays, including dimeric and pentameric species, are thoroughly characterized in solution by NMR, in the solid state by FT-IR, and at the solid,liquid interface by means of scanning tunneling microscopy. The employed strategy is extremely versatile as it relies on the tuning of the valency, size, and geometry of the molecular modules; thus, it may be of interest for the bottom-up fabrication of nanostructured functional materials with sub-nanometer precision. [source] Block Copolymer Nanolithography: Translation of Molecular Level Control to Nanoscale PatternsADVANCED MATERIALS, Issue 47 2009Joona Bang Abstract The self-asembly of block copolymers is a promising platform for the "bottom-up" fabrication of nanostructured materials and devices. This review covers some of the advances made in this field from the laboratory setting to applications where block copolymers are in use. [source] |