Synthesis of Nanocrystalline Iron Oxide Particles in the Iron(III) Acetate/Alcohol/Acetic Acid System

Gotić, Marijan; Musić, Svetozar

doi:10.1002/ejic.200700986

Cited by 40 publications

(18 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ethanol, well known as a very reactive small molecule with high polarity, was involved in the aggregation of ZnO nanoparticles via hydrogen bonding between the surfaces of the primary particles. The difference in secondary aggregation could be explained by different interactions of the solvent molecules with the surface of the primary particles . These processes of noncovalent interactions in addition to hydrogen bonding include the screening effect.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Ethanolamines on the Solvothermal Synthesis of Zinc Oxide: A Combined Experimental and Theoretical Study

et al. 2017

View full text Add to dashboard Cite

The solvothermal synthesis of ZnO particles from zinc acetylacetonate [Zn(acac)2] in the presence of monoethanolamine (MEA) or triethanolamine (TEA) at 170 °C is reported. The structural, optical and morphological characteristics of ZnO particles have been studied by X‐ray diffraction, UV‐Vis spectroscopy, FE‐SEM and TEM/STEM microscopy. The experimental findings are confirmed by means of DFT calculations. On the basis of the results, both experimental and theoretical, the growth mechanism is proposed which initiated the ZnO nucleation process continued by the growth of primary nanoparticles and immediately thereafter the spherical aggregation of ZnO particles. The calculations suggest that the process of ZnO nucleation proceeded mainly through the reaction of small dimers rather than oligomeric or monomeric species. The high chelating efficiency of both ethanolamines towards zinc with tetrahedral geometry is observed, having the same structural motif for the most stable ZnO–MEA and ZnO–TEA dimers. It was found that the way of primary ZnO nanoparticles growth and their spherical aggregation into final particles strongly depend on the type of ethanolamine used and the molar ratio [ethanolamine]/[Zn(acac)2]. The results show that the increase in TEA concentration could potentiate TEA coating on ZnO nanoparticles, which induced the formation of bigger, densely packed spherical aggregates. The reduced band gap energies were noticed with the increased sample microsphere size.

show abstract

Section: Resultsmentioning

confidence: 99%

The Influence of Ethanolamines on the Solvothermal Synthesis of Zinc Oxide: A Combined Experimental and Theoretical Study

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Fe(II)-acetate was used as the precursor. It was reported that Fe(II)-acetate [26] and Fe(III)-acetate [27] were widely used to synthesize iron oxide particles. Especially, pure nanometer-sized could be simply synthesized by Fe(II)-acetate in water under an argon atmosphere [26].…”

Section: Specimen Preparation and Test Solutionmentioning

confidence: 99%

Simulation of Porous Magnetite Deposits on Steam Generator Tubes in Circulating Water at 270 °C

et al. 2020

View full text Add to dashboard Cite

In the secondary side of pressurized water reactors (PWRs), the main corrosion product accumulated on the steam generator (SG) tubes is magnetite, which has a porous structure. The purpose of this work is to simulate the porous magnetite deposited to the SG tubes using a loop system. We newly developed a circulating loop system for a porous magnetite deposition test. A test section was designed as a single hydraulic flow channel, and a cartridge heater was fabricated and mounted into a commercial SG tube to provide an equal heating source for the primary water. After the deposition test, the simulated magnetite deposits were characterized for comparison to real SG tube deposits collected from an operating PWR plant. The magnetite deposits produced using the loop system were appropriate for simulating the real SG tube deposits because the particle characteristics, phase, and porous morphology are closely similar to those of real deposit samples. Using the loop system, the chemical impurities such as Na and Cl can be easily concentrated within the pores of the simulated magnetite deposits. These simulated magnetite samples are expected to be widely utilized in various research fields such as the heat transfer degradation and magnetite accelerated corrosion of SG tubes.

show abstract

“…Biomolecular catalysts that undergo ester‐elimination can be powerful for the synthesis of oxide semiconductor nanocrystals because such an esterification reaction can catalyze the formation of hydroxide intermediates, leading to the final nanocrystalline materials such as ZnO, CoO, CuO, Fe 3 O 4 /Fe 2 O 3 , and CoFe 2 O 4 . However, such reverse‐hydrolysis reactions are favored and more efficient when performed in organic solvents.…”

Section: Figurementioning

confidence: 99%

Enzyme‐Mimicking Peptides to Catalytically Grow ZnO Nanocrystals in Non‐Aqueous Environments

et al. 2015

View full text Add to dashboard Cite

The application of enzymesf or biomimetic material growth is ap otential path to breakthroughs in catalytic inorganic nanocrystal synthesis because the biocatalytic functions of proteins can lead to highly efficient growth of materials with accurate structures at low temperature. However,m any metal nanocrystals are grown in organic solvents, which is not an ideal environment for biomineralization with enzymes due to denaturing of catalytic pocket structures. Here, we applied ac atalytic CP4 peptide, optimized for protease reactions such as amide and ester hydrolysis, to test the catalytic ZnO nanocrystal growth in non-aqueous environments and the performance was compared with the enzyme subtilisin. We demonstrated that the CP4 catalytic peptide, evolved by the hydrogel-based combinatory phage display library, could grow ZnO nanoparticles from zinc acetate precursors in higher crystallinitya nd yield, as compared to the protease enzyme, in an organics olvent by catalyzing ester-elimination of precursors at room temperature.T his result indicates that catalytic oligopeptides, which possess no rigid 3D structures but are rather flexible, could fold into the catalytically active conformation more frequently in harsh environments such as organic solvents.Complex biomolecular systemss uch as enzymes, viruses, and bacteria have been applied for inorganic nanocrystal synthesis. [1] While these systems could catalyze nanocrystal growth under ambient conditions in aqueous environments, for further diversecatalytic applications it is desirable to optimizetheir activities for tolerating harsh organic environments. Recently, peptides, short building blocks of proteins,h ave shown potential to possesst he catalytic activity for enzymatic reactions in materialg rowth. [2] While some peptides have been shown to exhibit high catalytic activity in chemical reactions and material growth in ambient conditions, [2g] these peptides are not directly discovered to catalyze the target material growth, but they are rather selected on the basis of binding affinity to intermediates and products.F or such direct screening of the binding event the phage displayl ibrary has been used extensively; however the direct discovery of catalytic peptides from ac ombinatory phage display library meets difficultyi nt he panning process;e ven though certain peptides from random sequences on phage viruses catalyze target reactions, the isolation of these catalytic peptides for the identification of sequences through gene analysisi sv ery difficult. Previously,p eptidec atalysts for the room temperature growth of inorganic materials were screened with ac ombinatory phage display library by directly mixingthe library system in precursor solutions, however it is necessary to choose precursors that do not grow anyb yproducts except target materials, and such as pecial condition is not generally applicable to screen peptides for av arietyo f chemicalr eactions. [3] Recently,anew strategy to discover peptide catalysts for various material syntheses was demo...

show abstract

Synthesis of Nanocrystalline Iron Oxide Particles in the Iron(III) Acetate/Alcohol/Acetic Acid System

Cited by 40 publications

References 26 publications

The Influence of Ethanolamines on the Solvothermal Synthesis of Zinc Oxide: A Combined Experimental and Theoretical Study

The Influence of Ethanolamines on the Solvothermal Synthesis of Zinc Oxide: A Combined Experimental and Theoretical Study

Simulation of Porous Magnetite Deposits on Steam Generator Tubes in Circulating Water at 270 °C

Enzyme‐Mimicking Peptides to Catalytically Grow ZnO Nanocrystals in Non‐Aqueous Environments

Contact Info

Product

Resources

About