functionalization – Page 2 – TechConnect Briefs

Toxicological effects of functionalized single-walled carbon nanotubes (SWCNTs) on embryonic zebrafish (Danio rerio)

Felix L., Martinez-Rubi Y., Simard B., Goss G., University of Alberta, CA

Since their discovery in 1993, single-walled carbon nanotubes (SWCNTs) have played an integral role in nanotechnology and have been extensively studied due to their unique structural, electrical and mechanical properties. Chemical functionalization and coating of [...]

Sequential Surface Functionalization by Polyoxometalates and Lysine Renders Non-toxic Gold Nanoparticles Strong Antibacterial Agents

Daima H.K., Selvakannan P.R., Bhargava S.K., Bansal V., RMIT University, AU

Gold nanoparticles (AuNPs)are considered as biocompatible and important component for biomedical applications. In current study, AuNPs were synthesised using tyrosine amino acid mediated reduction of gold ions. These nanoparticles were functionalised with two polyoxometalates (POMs) [...]

Encapsulation of nanoparticles with multifunctional, cross-linkable diblock copolymers for biomedicine

Schmidtke C., Ostermann J., Tran H., Pöselt E., Kloust H., Niehaus J., Becker S., Kreuziger A., Werner K., Pietsch A., Weller H., University of Hamburg, DE

We would like to present a micellular encapsulation method for nanoparticles (quantum dots, iron oxides, gold) which is based on a ligand exchange procedure of native ligands with a prepolymer poly(isoprene)-diethylentriamine (PI-N3) and subsequent ligand [...]

Scalable gas phase nanoparticle treatment methods required for large-scale nanofluid and nanocomposite synthesis

Dion C.A.D., Tavares J.R., École Polytechnique de Montréal, CA

Recent work has demonstrated that while nanofluids do indeed exhibit increased heat transfer properties , there is no abnormal enhancement as had been claimed by early proponents of nanofluids. However, this lack of abnormal enhancement [...]

Electrical Nerve Agents Sensors Based on Chemically Functionalized Nanomaterials

Simonato J-P, CEA, FR

The threat of a chemical attack continues to grow and recent examples such as the terrorist attack of the Metro of Tokyo have shown that organophosphorus agents (OPs) are powerful neurotoxic weapons. There is still [...]

Water-soluble nanoparticles as an universal imaging tool

Niehaus J., Becker S., Schmidtke C., Ness D., Werner K., Weller H., Center for Applied Nanotechnology, DE

Here we present a two step concept for phase transfer of NPs soluble in non-polar media. The first step is an exchange of the stabilizing organic molecules against a multidental binding short chain polymer. In [...]

Carboxylation of Boron- and Nitrogen-Doped Graphene and Carbon Nanotubes: First Principles Study

Al-Aqtash N., Vasiliev I., New Mexico State University, US

We study the mechanism of covalent functionalization of boron (B) and nitrogen (N) doped graphene and carbon nanotubes by carboxyl (COOH) groups. Our calculations are carried out using density functional theory combined with the generalized [...]

Functionalization of Carbon Nanotubes for Advanced CNT/LCP Nanocomposites

Sahoo N.G., Cheng H.K.F., Li L., Chan S.H., Zhao J., Nanyang Technological University, SG

A novel approach has been made to the chemical functionalization of multi-walled carbon nanotubes (MWCNTs) for developing advanced polymeric nanocomposites with liquid crystalline polymer (LCP). In the approach, we have selectively introduced two types of [...]

Electrical Properties of Functionalized Silicon Nanoparticles

Hartner S., Gupta A., Wiggers H., University Duisburg-Essen, DE

Phosphorous-doped as well as undoped Si-NPs with a mean particle diameter of about 50 nm were synthesized in a microwave plasma. The natural oxide was removed by etching the particles with hydrofluoric acid. In order [...]

Solid State and Template Free Synthesis of a Nanotubular Polyaniline-TiO2 Composite

Bonnot K., Grandcolas M., Keller V., Spitzer D., ISL-CNRS, FR

Our work report on the synthesis of a novel polyaniline-titania tubular composite at nanoscale. Significant new accomplishments relies on the synthesis of polyaniline-TiO2 composite nanotubes, as up to now most researchs in this field reported [...]