Templated Synthesis (templated + synthesis)

Distribution by Scientific Domains

Selected Abstracts

Templated Synthesis of Mesoporous Superparamagnetic Polymers,

B. Fuertes
Abstract We present a novel synthetic strategy for fabricating superparamagnetic nanoparticles randomly dispersed in a mesoporous polymeric matrix. This method is based on the use of mesoporous silica materials as templates. The procedure used to obtain these mesoporous magnetic polymers consisted in: a),generating iron oxide ferrite magnetic nanoparticles (FMNP) of size ,,7,8,nm within the pores of the silica, b),loading the porosity of the silica/FMNP composite with a polymer (Polydivinylbenzene), c),selectively removing the silica framework from the resulting silica/FMNP/polymer composite. Such magnetic porous polymeric materials exhibit large surface areas (up to 630,m2,g,1), high pore volumes (up to 0.73,cm3,g,1) and a porosity made up of mesopores. In this way, it is possible to obtain superparamagnetic mesoporous hybrid nanocomposites that are easily manipulated by an external magnetic field and display different magnetic behaviours depending on the textural properties of the template employed. [source]

Templated Synthesis of Copper(II) Azacyclam Complexes Using Urea as a Locking Fragment and Their Metal-Enhanced Binding Tendencies towards Anions

Massimo Boiocchi Dr.
Abstract Copper(II) azacyclam complexes 32+ and 42+ were obtained through a metal-templated procedure involving the pertinent open-chain tetramine, formaldehyde and a phenylurea derivative as a locking fragment. Both metal complexes can establish interactions with anions through the metal centre and the amide NH group. Equilibrium studies in DMSO by a spectrophotometric titration technique were carried out to assess the affinity of 32+ and 42+ towards anions. While the NH group of an amide model compound and the metal centre of the plain CuII(azacyclam)2+ complex do not interact at all with anions, 32+ and 42+ establish strong interactions with oxo anions, profiting from a pronounced cooperative effect. In particular, 1),they form stable 1:1 and 1:2 complexes with H2PO4, ions in a stepwise mode with both hydrogen-bonding and metal,ligand interactions, and 2),in the presence of CH3COO,, they undergo deprotonation of the amido NH group and thus profit from axial coordination of the partially negatively charged carbonyl oxygen atom in a scorpionate binding mode. [source]

Ultrabubble: A Laminated Ultrasound Contrast Agent with Narrow Size Range

ADVANCED MATERIALS, Issue 38-39 2009
Pei-Lun Lin
A laminated shell microcapsule is described resisting aggregation and withstanding ultrasound destruction, showing a good backscatter signal, as shown in the figure. Templated synthesis produces versatile monodisperse capsules <3 Ám, with ultrasound-pressure dependency allowing rupture above MI , 1.5 (at 2 MHz), suitable for future development as both controlled-delivery agent and contrast agent. [source]

A Highly Efficient Chemical Sensor Material for H2S: ,-Fe2O3 Nanotubes Fabricated Using Carbon Nanotube Templates,

Z. Sun
,-Fe2O3 nanotubes that can be used as chemical sensors (see Figure) are fabricated by a novel carbon nanotube (CNT) templated synthesis. CNTs are coated with a continuous layer of Fe2O3 nanoparticles by the decomposition of Fe(NO3)3 in a supercritical CO2/ethanol solution. Subsequent removal of the CNTs gives ,-Fe2O3 nanotubes that are highly sensitive to H2S, which makes them attractive materials for chemiluminescent H2S sensors. [source]