Janus Silica Hollow Spheres Prepared via Interfacial Biosilicification.

08:00 EDT 22nd October 2015 | BioPortfolio

Summary of "Janus Silica Hollow Spheres Prepared via Interfacial Biosilicification."

A poly(ethylene glycol)-b-poly(L-lysine)-b-poly(styrene) (PEG-PLL-PS) triblock copolymer, which contains cationic PLL block as the middle block, is synthesized via the combination of ring-opening polymerization (ROP) and atom transfer radical polymerization (ATRP). The PEG-PLL-PS (ELS) triblock is employed as macromolecular surfactants to form stable oil-in-water (O/W) emulsion, which is subsequently applied as the template to prepare Janus silica hollow spheres (JHS) via one-pot biosilicification reaction. For the emulsion template, the middle PLL block assembles at the O/W interface and directs the biomi-metic silica synthesis in the presence of phosphate buffer and silicic acid precursors. This biosilicification process takes place only in the intermediate layer between water and organic interior phase, leading to the formation of silica JHSs with hydrophobic PS chains tethered on the inner surface and PEG attached on the outer surface. The three-layer JHSs, namely PEG/silica-polylysine/PS composites, were verified by electron microscopy. Further breaking these JHSs into species, polymer grafted Janus silica nanoplates (JPLs) can be obtained. Our studies provide an efficient one-step method to prepare hybrid silica Janus structures within minutes.


Journal Details

This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827


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Medical and Biotech [MESH] Definitions

Agents that inhibit JANUS KINASES.

A Janus kinase subtype that is involved in signaling from GROWTH HORMONE RECEPTORS; PROLACTIN RECEPTORS; and a variety of CYTOKINE RECEPTORS such as ERYTHROPOIETIN RECEPTORS and INTERLEUKIN RECEPTORS. Dysregulation of Janus kinase 2 due to GENETIC TRANSLOCATIONS have been associated with a variety of MYELOPROLIFERATIVE DISORDERS.

A non-crystalline form of silicon oxide that has absorptive properties. It is commonly used as a desiccating agent and as a stationary phase for CHROMATOGRAPHY. The fully hydrated form of silica gel has distinct properties and is referred to as SILICIC ACID.

A Janus kinase subtype that is involved in signaling from a broad variety of CYTOKINE RECEPTORS.

An interleukin-21 receptor subunit that combines with the INTERLEUKIN RECEPTOR COMMON GAMMA SUBUNIT to form a high affinity receptor for interleukin-21. It signals via interaction of its cytoplasmic domain with JANUS KINASES such as JANUS KINASE 1 and JANUS KINASE 3.

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