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Distribution by Scientific Domains

Polymers and Materials Science	90%

Selected Abstracts

Electrochemical Crystallization of Cuprous Oxide with Systematic Shape Evolution,

ADVANCED MATERIALS, Issue 19 2004
J. Siegfried
The growth of Cu2O crystals that are electrochemically deposited as micrometer-size crystals with systematically varying fractions of {100} and {111} faces is reported (the Figure depicts cubic crystals). The methodical and homogeneous shape evolution is achieved by tuning the degree of preferential adsorption of sodium dodecyl sulfate on the {111} faces of growing Cu2O crystals through pH variation. Scale bar: 1,,m. [source]

Cover Picture: J. Basic Microbiol.

JOURNAL OF BASIC MICROBIOLOGY, Issue 2 2009
2/200
Morphological diversity among Anabaena isolates from major agro-ecologies of India, depicting the heterogeneity in shape, size and colour of cells and trichomes. Shown are Anabaena type strain, coiled filaments (A. circinalis), pointed end cell (A. spiroides), double heterocysts (A. iyengarii), heterocysts (A. aphanizomenoides), large, oval and boat shaped akinetes (A. flos-aquae, A. anomala, A. naviculoides), in-situ germination of akinetes (A. sphaerica) and a series of akinetes (A. variabilis var. ellipsospora). Scale bar = 40 ,m (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

A Conducting-Polymer Platform with Biodegradable Fibers for Stimulation and Guidance of Axonal Growth

ADVANCED MATERIALS, Issue 43 2009
Anita F. Quigley
A biosynthetic platform composed of a conducting polypyrrole sheet embedded with unidirectional biodegradable polymer fibers is described (see image; scale bar,=,50 µm). Such hybrid systems can promote rapid directional nerve growth for neuro-regenerative scaffolds and act as interfaces between the electronic circuitry of medical bionic devices and the nervous system. [source]

Bicolor Pixels from a Single Active Molecular Material by Surface-Tension-Driven Deposition,

ADVANCED MATERIALS, Issue 12 2007
I. Viola
The fabrication of a green- and red-emitting pixel structure (see figure, scale bar 10,,m) by the single-step, surface-tension-driven assembly of a single luminescent thiophene-based molecular material is reported. The solid-state organization of the selected thiophene-based oligomer is controlled by exploiting the molecular structural arrangement, induced during a dewetting process and facilitated by the great conformational flexibility of the oligomer, typical of several substituted oligothiophenes. [source]

Covalent Attachment of Low Molecular Weight Poly(ethylene imine) Improves Tat Peptide Mediated Gene Delivery,

ADVANCED MATERIALS, Issue 16 2006
F. Alexis
A polymer-peptide hybrid biomaterial synthesized by coupling poly(ethylene imine) directly to resin-supported Tat peptide takes advantage of the unique features associated with the two original cationic materials and functions as a novel gene-delivery vector with good biocompatibility. The figure shows cells transfected with green fluorescent protein (GFP) using complexes of the polymer-peptide hybrid and GFP (scale bar: 100,,m). [source]

A Simple Sol,Gel Synthesis of Superconducting MgB2 Nanowires,

ADVANCED MATERIALS, Issue 14 2006
M. Nath
Superconducting MgB2 nanowires have been synthesized in a very high yield by a simple soft-chemical approach combining sol-gel chemistry and pyrolysis techniques (see main image in the figure; scale bar: 10,,m). The long thin nanowires show a superconducting transition temperature, Tc, of ca.,39,K, as shown in the magnetization curve in the inset of the figure. [source]

Combinatorial Material Mechanics: High-Throughput Polymer Synthesis and Nanomechanical Screening,

ADVANCED MATERIALS, Issue 21 2005
A. Tweedie
Combinatorial materials science requires parallel advances in materials characterization. A high-throughput nanoscale synthesis/nanomechanical profiling approach capable of accurately screening the mechanical properties of 1,700 photopolymerizable materials (see Figure, scale bar: 100 ,m) within a large, discrete polymer library is presented. This approach enables rapid correlation of polymer composition, processing, and structure with mechanical performance metrics. [source]

Multiply Shaped Silica Mediated by Aggregates of Linear Poly(ethyleneimine),

ADVANCED MATERIALS, Issue 7 2005
J.-J. Yuan
A new method for biomimetic silica fabrication is reported. Organized poly(ethyleneimine) rapidly catalyzes and directs the shape of silica in the hydrolysis of tetramethoxysilane under ambient conditions. The resultant silica displays a diversity of controllable morphologies, such as flower, plate, bundle, leaf, and sphere (see Figure, scale bar represents 1,,m). [source]

Three-Dimensional Assembly of Polymer Microstructures at Low Temperatures ,

ADVANCED MATERIALS, Issue 6 2004
Y. Yang
A low-temperature, low-pressure polymer bonding technique for three-dimensional assembly of microstructures (see Figure; scale bar 5 ,m) based on carbon dioxide (CO2)-enhanced chain entanglement near the polymer surfaces is presented. The environmentally benign utilization of supercritical CO2 offers scope for the production of polymer-based biomedical applications and devices. [source]

Selective Electroless Deposition of Cu on an Ultrathin Au Film Pattern

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 22 2004
Maofeng Zhang
Abstract Summary: In this report an ultrathin Au nanoparticle (AuNP) film composed of photosensitive diazoresin (DR) and mercaptophenol (MP) capped AuNPs (MP-AuNPs) was fabricated by self-assembly (SA). The DR/MP-AuNP film was then patterned through a photomask by selective exposure to UV light and instantly developed in sodium dodecyl sulfate (SDS) aqueous solution. After sintering at 550,°C to remove the organic components, the DR/MP-AuNPs formed AuNPs. Taking advantage of the catalytic susceptibility of AuNPs toward electroless deposition of Cu, a Cu film micropattern with fine resolution (ca. 2,3 ,m) and considerable thickness (ca. 130 nm) was prepared. SEM image of the micropatterned Cu film on a silicon substrate; scale bar: 10 ,m. [source]

Tunable Hydrogels for External Manipulation of Cellular Microenvironments through Controlled Photodegradation

ADVANCED MATERIALS, Issue 1 2010
April M. Kloxin
A photocleavable, poly(ethylene-glycol)-based hydrogel is presented in which predictable, user-defined gradients in the network's structure can be fabricated in real time under cytocompatible conditions. This platform provides new opportunities to investigate how material structure influences cell function. Here, cell morphology is directed spatially by degradation-induced gradients in the local polymer density (see figure, scale bars: 50 ,m). [source]