Synthesis of assembled ZnO structures by precipitation method in aqueous media

Sepúlveda-Guzmán, S.; Reeja‐Jayan, B.; Rosa, E. De la; Torres–Castro, Alejandro; González-González, V.; José–Yacamán, Miguel

doi:10.1016/j.matchemphys.2008.11.030

Cited by 145 publications

(74 citation statements)

References 35 publications

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“…It is not surprising that an alkaline environment catalyzes the formation of ZnO based on the previous studies [12,23e26]. For example, flake-like ZnO structures which seem growing over a common nucleus were reported when equal volume of 4 M NaOH and 0.2 M zinc nitrate were reacted at 60 C [26]. In another study, ZnO crystals with round and sheet like morphology depending on OH À1 :Zn 2þ ratio were obtained at room temperature when OH À1 :Zn 2þ ratio was 2.5:1 or higher [12].…”

Section: Resultsmentioning

confidence: 94%

Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

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Çetinkaya

2015

Materials Chemistry and Physics

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h i g h l i g h t s g r a p h i c a l a b s t r a c tAqueous precipitation products of Zn(NO 3 ) 2 and NaOH were prepared. Synthesis route and lysozyme addition affected morphology of the products. Aqueous precipitation products of Zn(NO 3 ) 2 and NaOH obtained by changing the method of combining the reactants and by using lysozyme as an additive were investigated. In the case of single addition method, octahedral ε-Zn(OH) 2 and plate-like b-Zn(OH) 2 structures formed in the absence and in the presence of lysozyme, respectively. Calcination of these Zn(OH) 2 samples at 700 C yielded porous ZnO structures by conserving the template crystals. When zinc source was added dropwise into NaOH solution, predominantly clover-like ZnO crystals were obtained independent of lysozyme addition. Mixed spherical and elongated ZnO morphology was observed when NaOH was added dropwise into Zn(NO 3 ) 2 solution containing lysozyme. Lysozyme contents of the precipitation products were estimated as in the range of~5e20% and FTIR indicated no significant conformational change of lysozyme in the composite. These results suggest that lysozyme-ZnO/Zn(OH) 2 composite materials may have a value as an antibacterial material.

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Section: Resultsmentioning

confidence: 94%

Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

Top

Çetinkaya

2015

Materials Chemistry and Physics

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“…Similar morphologies have been reported for ZnO prepared from Zn(NO 3 ) 2 solutions. 9 However in that instance the hydroxide was added rapidly into the nitrate precursor with vigorous stirring. This difference indicates that the processes controlling nucleation and growth of the ZnO are sensitive to both the reaction parameters and the identity of the counter-ion in the zinc precursor.…”

Section: Methods Of Combining Reactantsmentioning

confidence: 99%

Aqueous pathways for the formation of zinc oxide nanoparticles

2011

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We examine the effect of reactant concentrations, temperatures and feeding methods on the morphology of ZnO formed when reacting solutions of ZnSO 4 and NaOH. The catalytic effect of hydroxide in excess relative to the stoichiometric ratio is considered. It is shown that, having fixed other reaction conditions, the end-products, particle structures and size strongly depend on the mole ratio of the precursors. The presence of zinc salt hydroxide species was confirmed at sub-stoichiometric ratios in slightly acidic conditions. At the stoichiometric ratio both zinc hydroxide and zinc oxide are formed, while only zinc oxide forms in an excess of hydroxide. The method of feeding the reactants into the reaction vessel also has a strong influence on the end-product properties, as does the reaction temperature. By control of these parameters the specific surface area could be varied from 10 to 33 m 2 g -1 , the particle shape could be varied from equiaxed, through to star-like and needle-like, and the particle size may be varied from 50 to over 300 nm.

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“…It is said that the aggregation of the particles begins after the particles reach a stable size; later nucleation occurs by colliding with other smaller particles in a random manner, leading to a selfassembly, which may occur by a random or highly oriented process. On the other hand, Sepulveda-Guzman et al [27] proposed a scheme of self-assembly of the nanoparticles, as given in Figure 3. Table 3 reports the geometries shown in every sample.…”

Section: Morphological Propertiesmentioning

confidence: 99%

Synthesis of ZnO Nanopowders by the Homogeneous Precipitation Method: Use of Taguchi’s Method for Analyzing the Effect of Different Variables

Herrera-Rivera

Olvera

Maldonado

2017

Journal of Nanomaterials

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In the present work the effect of different factors in the synthesis of ZnO powders by the homogeneous precipitation method is analyzed. A robust statistical technique, Taguchi's method, was used to reduce the experiments number. The variables studied were precursor, solvent and precipitating agent type, Zn molar concentration, percentage of saturation, speed and time of agitation, and temperature of synthesis. In order to optimize the particle size, an experimental design of 18 trials was proposed, according to L 18 Taguchi array. Structural and morphological properties were characterized by X-ray diffraction (XRD) and scanning and transmission electron microscopy techniques (SEM and TEM). The estimated crystallite size in synthesized samples ranged from 32 to 57 nm. The morphologies obtained presented several forms, such as spheres, wires, flowers, bars, and tetrahedrons, with a particle size variation of 35 to 165 nm. In this work it is shown that using a statistical experimental design leads us to a fast and reliable optimization of the synthesis parameters for obtaining small size ZnO nanoparticles, thus optimizing time and human and materials resources.

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Synthesis of assembled ZnO structures by precipitation method in aqueous media

Cited by 145 publications

References 35 publications

Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

Aqueous pathways for the formation of zinc oxide nanoparticles

Synthesis of ZnO Nanopowders by the Homogeneous Precipitation Method: Use of Taguchi’s Method for Analyzing the Effect of Different Variables

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