A hybrid electrochemical–thermal method for the preparation of large ZnO nanoparticles

Chandrappa, K. G.; Venkatesha, T. V.; Vathsala, K.; Shivakumara, C.

doi:10.1007/s11051-009-9846-0

Cited by 75 publications

(49 citation statements)

References 31 publications

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“…Zinc oxide nanoparticles and copper nanoparticles, which were produced by means of an already reported electrochemical synthesis [12,13,30,31], were dispersed in Estel1000, Estel1100, and Silo111 (CTS, Altavilla Vicentina, Italy) to prepare nanocomposites. The procedure consisted in mixing the ZnO-NPs white powder (or the Cu-NPs colloid) with the consolidants/waterrepellents at various % w/w concentrations [11,12,14].…”

Section: Nanocomposites Preparationmentioning

confidence: 99%

“…The ZnO-NPs, synthesised by means of a simple and reproducible electrochemical procedure [30,31], are embedded in consolidant/water repellent matrices to obtain nanostructured coatings. Commonly used tetraethoxysilane (TEOS)-and/or siloxanes-based materials (Estel1000, Silo111, and Estel1100) have been selected and the resulting nanomaterials have been fully characterised with XPS in order to determine the amount and speciation of the NPs available on the surface.…”

Section: Introductionmentioning

confidence: 99%

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Development of a novel conservation treatment of stone monuments with bioactive nanocomposites

et al. 2015

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In this study a conservation treatment of stone monuments meant for consolidation, protection, and inhibition of biofilm formation is proposed. The method is developed as a part of a systematic investigation aimed at producing nanocomposite coatings able to exert a marked biological activity over a long period of time thanks to their peculiar structure. Zinc oxide nanoparticles, synthesised by means of simple and reproducible electrochemical procedures, are embedded in commercially available and commonly used consolidant/water repellent matrices to obtain nanostructured materials. Products based on tetraethoxysilane and/or polysiloxanes were tested. In a first step the nanomaterials were applied on stone samples and studied with scanning electron microscopy and spectrophotocolorimetry. Then, in situ experimentation was undertaken by applying nanocomposite coatings on the exterior of a 12th-century church in the south of Italy. The performances of the ZnO-nanoparticles based composite coating were compared with a previously investigated copper nanoparticles based material, successfully tested and monitored in situ for more than two years. Finally, preliminary tests on the inhibitory effect on the growth of the fungus Aspergillus niger were also carried out. The results showed that in case of zinc oxide a tenfold higher concentration of nanoparticles as compared with Cu-NPs can be utilized in the matrices without affecting the colour of the stone substrate, which means that the new material should be able to exert a long-lasting biocide activity. Laboratory and in situ tests of the developed innovative nanomaterials yielded very promising, though preliminary, results in terms of chromatic changes, morphological characteristics and bioactivity. Constant monitoring of the coatings will be continued in order to obtain all necessary information on their long term behaviour and inhibition of biological colonisation.

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Section: Nanocomposites Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a novel conservation treatment of stone monuments with bioactive nanocomposites

et al. 2015

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“…A two-electrode monopolar electrolytic cell (Chandrappa et al, 2010) with zinc as sacrificial anode was used for electrochemical synthesis of ZnO. The electrodes were supported on a holder made of ebonite and placed inside the electrolyte solution comprising 0.009 M NaHCO 3 .…”

Section: Preparation Of Zno Npsmentioning

confidence: 99%

“…For large scale preparation of ZnO NPs, the ease of preparation and extraction in the solid state are very important and a novel methodology to prepare ZnO NPs with controllable size, desirable morphology and homogeneous and uniform distribution of particles is critically sought for. In this context, electrochemical methods have gained considerable interest because of their simplicities, low temperature operations, and viabilities for commercial production (Chandrappa et al, 2010;Zhu et al, 2006;Geeetha and Thilagavathi, 2010). The effects of electrolyte concentration and current density on the yield for ZnO NPs have already been reported and the effect of calcination temperatures on the morphology and size of ZnO has been touched upon (Chandrappa et al, 2010); but a clear understanding of the effect of calcination temperature on the morphology and size of ZnO still remains an unresolved issue.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, electrochemical methods have gained considerable interest because of their simplicities, low temperature operations, and viabilities for commercial production (Chandrappa et al, 2010;Zhu et al, 2006;Geeetha and Thilagavathi, 2010). The effects of electrolyte concentration and current density on the yield for ZnO NPs have already been reported and the effect of calcination temperatures on the morphology and size of ZnO has been touched upon (Chandrappa et al, 2010); but a clear understanding of the effect of calcination temperature on the morphology and size of ZnO still remains an unresolved issue. A systematic approach to thoroughly investigate the growth kinetics of ZnO NPs at different calcination temperatures and tune size and morphology for task-specific applications is yet to be made.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of ZnO nanoparticles by a hybrid electrochemical-thermal method: influence of calcination temperature

Hassan

Miran

Simol

et al. 2015

Bangladesh J. Sci. Ind. Res.

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ZnO nanoparticles (NPs) with size less than 100 nm were successfully prepared by a hybrid electrochemical-thermal method using metallic zinc and NaHCO 3 without the use of any zinc salt, template or surfactant. The NPs were characterized by Fourier transform infra-red (FT-IR) spectroscopy, UV-visible spectroscopy, photoluminescence spectroscopy (PL), thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. UV-visible spectral analysis indicated that the particle size increased with increasing calcination temperature. The band gap (3.91-3.83 eV) was higher for synthesized ZnO NPs than their bulk counterparts (3.37 eV). The FT-IR spectra at different calcination temperatures showed the characteristic band for ZnO at 450 cm -1 to be prominent with increasing temperature due to the conversion of precursor into ZnO. The wurtzite hexagonal phase was confirmed by XRD analyses for ZnO NPs calcined at 700 o C. The green photoluminescent emission from ZnO NPs at different calcination temperatures is considered to be originated from the oxygen vacancy or interstitial related defects in ZnO. SEM images clearly showed that the NPs are granular and of almost uniform size when calcined at higher temperatures. EDX spectra further confirmed the elemental composition and purity of ZnO obtained on calcination at 700 o C. The NPs are well dispersed near or above calcination temperature of 700 o C.

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Nano‐Antimicrobials Based on Metals

Sportelli

Cioffi

2014

Novel Antimicrobial Agents and Strategies

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A hybrid electrochemical–thermal method for the preparation of large ZnO nanoparticles

Cited by 75 publications

References 31 publications

Development of a novel conservation treatment of stone monuments with bioactive nanocomposites

Development of a novel conservation treatment of stone monuments with bioactive nanocomposites

Synthesis of ZnO nanoparticles by a hybrid electrochemical-thermal method: influence of calcination temperature

Nano‐Antimicrobials Based on Metals

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