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Silica Structures (silica + structure)

Distribution by Scientific Domains
Polymers and Materials Science75%

Selected Abstracts

Microstructures: Facile Fabrication of Monolithic 3D Porous Silica Microstructures and a Microfluidic System Embedded with the Microstructure (Adv. Funct.

ADVANCED FUNCTIONAL MATERIALS, Issue 9 2010
Mater.
D.-P. Kim and co-workers present the fabrication of monolithic 3D porous silica structures into a multilayer framework with bimodal pore size distribution on page 1473. The structure becomes monolithic upon pyrolyzing the stacked layers, and then easily embedded in microchannel with the aid of photolithography, leading to a microfluidic system with built-in microstructure in a site- and shape-controlled manner. [source]

Facile Fabrication of Monolithic 3D Porous Silica Microstructures and a Microfluidic System Embedded with the Microstructure

ADVANCED FUNCTIONAL MATERIALS, Issue 9 2010
ZuoYi Xiao
Abstract Monolithic 3D porous silica structures are fabricated into a multilayer framework with a bimodal pore size distribution in the micrometer and sub-micrometer range. The fabrication , which involves directed assembly of colloidal spheres, transfer printing, and removal of a sacrificial template , yields robust and mechanically stable structures over a large area. The structure becomes monolithic upon pyrolyzing the stacked layers, which induces necking of the particles. The monolithic microstructures can easily be embedded in microchannels with the aid of photolithography, leading to the formation of a microfluidic system with a built-in microstructure in a site- and shape-controlled manner. Utilization of the system results in a fourfold increase in the mixing efficiency in the microchannel. [source]

Biomimetic Nanostructures: Diatomaceous Lessons in Nanotechnology and Advanced Materials (Adv. Mater.

ADVANCED MATERIALS, Issue 29 2009
29/2009)
The cover picture shows a series of SEM and AFM images of silica structures from several different diatom species. These images demonstrate remarkable structural diversity and unique porous architectures of diatoms justifying their status as the world's smallest nanofabrication factories. Further details can be found in the article by Nicolas Voelcker and co-workers on p. 2947. [source]

Silica Pattern Formation in Diatoms: Species-Specific Polyamine Biosynthesis

CHEMBIOCHEM, Issue 9 2006
Manfred Sumper Prof. Dr.
Abstract Diatoms are eukaryotic, unicellular algae that are well known for the intricate architecture of their silica-based cell walls. Species identification is mainly based on variations of their hierarchically organized silica structures. Particularly striking silica frameworks are found among diatoms that belong to the genus Coscinodiscus. Recent work indicates an important role for long-chain polyamines in guiding silica precipitation as well as in silica-pattern formation. Here we demonstrate that polyamines, even if isolated from closely related diatom species, exhibit substantial structural differences. Structural variations include the overall chain length, the degree of methylation, positions of secondary amino functionalities, and, unexpectedly, site-specific incorporation of a quaternary ammonium functionality. These findings support a specific role for polyamines in creating silica nanostructures. [source]