we have used tungestophosphoric acid to catalyze oxidative amidation reaction from benzyl alcohols and methylarens with hydrochloride salts of amines. to achieve this purpose, modified magnetic nanoparticles (γ-fe2o3@sio2@h3pw12o40) were applied as catalyst and tbhp as external oxidant. after optimizing, different derivates of benzamides were synthesized in good yields. also, the result of two ...

Nguyen, Anh Tue. M.S., Purdue University, August 2014. Synthesis and Characterization of Crystalline Iron Nanoparticles from Zerovalent Iron Sandwich Complexes. Major Professor: Alexander Wei. In this project we present a systematic study on the synthesis of crystalline iron nanocubes by thermal decomposition of an iron sandwich complex, (π-C5H5)Fe(π-C6H7), in the presence of oleylamine and ole...

The effect of ultrasonic irradiation on direct maghemite (γ-Fe2O3) preparation by a co-precipitation method with Fe3+ salt (Fe(NO3)3) and an excess amount alkaline (KOH) solution without going through the conventional magnetite (Fe3O4) formation route was explored in comparison impeller stirring. procedure for obtaining iron oxide nanoparticles designed using sequential processes precipitation,...

The functional hollow biodegradable microcapsules modified with the maghemite γ-Fe2O3 nanoparticles and the hollow spherical CoFe2O4 / SiO2 nanocomposites were synthesized. Mössbauer spectroscopy data reveal that the main part maghemite nanoparticles have evident superparamagnetic behavior which is retained up to room temperature. This allows directing the microcapsules by an external magnetic ...

Magnetic iron oxide nanoparticles and near-infrared (NIR) fluorescent single-walled carbon nanotubes (SWNT) form heterostructured complexes that can be utilized as multimodal bioimaging agents. Fe catalyst-grown SWNT were individually dispersed in aqueous solution via encapsulation by oligonucleotides with the sequence d(GT)15, and enriched using a 0.5 T magnetic array. The resulting nanotube c...

Magnetic g-Fe2O3@SiO2 core-shell nanocomposite was prepared using Stöber method and functionalized firstly by isopropenyloxytrimethylsilane as a coupling agent to enter active acetylacetone on the surface of nanoparticles, after that synthesized azo dye ligand, 2-(2-benzothiazolyl azo)-4-methoxyaniline. In such way, g-Fe2O3@SiO2-azo hybrid formed. The structure evidenced physical chemical analy...

This work described a simple and efficient synthesis of dialkyl 3-(alkylamino)-1-aryl-1H-pyrazole-4,5-dicarboxylates via a three component reaction between arylhydrazine, alkylisocyanid and dialkylacetylenedicarboxylates in the presence of phenylisocyanate and α-Fe2O3 nanoparticles. Eco friendly, solvent-free conditions, excellent yields, and short reaction times, inexpensive and readily availa...

This study was supported by EU FP7 grant GlowBrain (REGPOT–2012–CT2012– 316120) to S.G. and by a University of Trento Startup Grant and the Cassa di Risparmio di Trento e Rovereto Grant n. 2011.0251 to S.C. Since the central nervous system shows very little capability for self-repair following ischemic injury, regenerative medicine approaches are increasingly interested in the use of neural ste...

Iron oxide nanoparticles (α- Fe2O3) were synthesized using an unconventional, eco-friendly technique utilizing a Hibiscus rosa sinensis flower (common name, China rose) extract as reducer and stabilizer agent. The microwave method was successfully used for the synthesis of iron nanoparticles. Various volume ratios chloride tetrahydrate to taken heated by oven different periods optimize nanopart...

In this thesis, a generic method was developed for surface modification of nanoparticles (NP) with silica shell using Stöber method. Nanoparticles synthesized from nonhydrolytic solvents such as various ethers were first surface activated with a silane-based poly(ethylene glycol) (PEG). Because of the amphiphilicity of PEG moiety, these nanoparticles could be easily transferred from hydrophobic...