Comparative study of microwave and conventional methods for the preparation and optical properties of novel MgO-micro and nano-structures

Selvam, N. Clament Sagaya; Kumar, Ravi; Kennedy, L. John; Vijaya, J. Judith

doi:10.1016/j.jallcom.2011.08.032

Cited by 237 publications

(126 citation statements)

References 43 publications

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“…Takahashi (2007) reported the preparation of cubeshaped MgO nanoparticles by the microwave-assisted hydrothermal method. Recently, Selvam et al (2011) synthesized MgO nanoparticles from magnesium and urea as precursors by the microwave-assisted route. Compared to nanoparticles prepared by the conventional method, MgO nanoparticles obtained by the microwaveassisted method had higher surface area (63.56 m 2 /g).…”

Section: Hydrothermal Methodsmentioning

confidence: 99%

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MgO nanoparticles as antibacterial agent: preparation and activity

Tang

2014

Braz. J. Chem. Eng.

336

161

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-Bacterial pollution is a great risk for human health. Nanotechnology offers a way to develop new inorganic antibacterial agents. Nano-inorganic metal oxide has a potential to reduce bacterial contamination. MgO is an important inorganic oxide and has been widely used in many fields. Many studies have shown that MgO nanoparticles have good antibacterial activity. Therefore, in this paper, the main synthesis methods, antibacterial activity and antibacterial mechanisms of MgO nanoparticles are reviewed.

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Section: Hydrothermal Methodsmentioning

confidence: 99%

“…The morphology and sizes of MgO nanoparticles can be controlled by adjusting the processing conditions Selvam et al, 2011). In this section, three methods, including the sol-gel method, hydrothermal method and microemulsion method, are mainly discussed.…”

Section: Preparation Of Mgo Nanoparticlesmentioning

confidence: 99%

MgO nanoparticles as antibacterial agent: preparation and activity

Tang

2014

Braz. J. Chem. Eng.

336

161

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“…We also sketch in Figure 9a some known impurity states in the gap due to Mg 2+ or O vacancies. [44][45][46][47][48][49][50][51][52] The band from which the emission emanates from the Si nanoparticles is over the range from 530-700 nm. Si nanoparticles or the Mg-based shell can absorb UV photons directly from the ground state into the conduction band states (above the band gap edge at 3.4 eV).…”

Section: Analysis and Discussionmentioning

confidence: 99%

Wideband luminescence from bandgap-matched Mg-based Si core-shell geometry nanocomposite

et al. 2018

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We use wet treatment to integrate red-luminescent Si nanoparticles with Mg-based wide-bandgap insulators Mg(OH) and MgO (5.7 and 7.3 eV respectively). In the process, Mg2+ is reduced on Si nanoparticle clusters, while suffering combustion in water, producing a spatially inhomogeneous Mg(OH)2/MgO-Si nanoparticle composite with an inner material predominantly made of Si, and a coating consisting predominantly of magnesium and oxygen (“core-shell” geometry). The nanocomposite exhibit luminescence covering nearly entire visible range. Results are consistent with formation of Mg(OH)2/MgO phase with direct 3.43-eV bandgap matching that of Si, with in-gap blue-green emitting states of charged Mg and O vacancies. Bandgap match with nanocomposite architecture affords strong enough coupling for the materials to nearly act as a single hybrid material with novel luminescence for photonic and photovoltaic applications.

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“…MgO can chemisorb H 2 O and CO 2 from the surroundings due to its surface acidÀbase properties. [10,28,29] A sharp band corresponding to the adsorption of gas-phase CO 2 was visible at 2337 cm ¡1 and 2360 cm ¡1 and the band at 1455 cm ¡1 appears in the MgO spectrum and is attributed to CO 3 2¡ absorption bands, [10,25] whereas the peaks at 3434 cm ¡1 and 1629 cm ¡1 are assigned to the stretching and bending vibration of the hydroxyl groups and adsorbed water. [30] The peak at 429 cm ¡1 corresponds to the stretching vibration of MgÀO.…”

Section: Pxrd Analysismentioning

confidence: 99%

Development of a novel nanocomposite consisting of 3-(4-methoxyphenyl)propionic acid and magnesium layered hydroxide for controlled-release formulation

Hashim

Misuan

Isa

et al. 2016

Journal of Experimental Nanoscience

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Magnesium layered hydroxide (MLH) intercalated with anionic 3-(4-methoxyphenyl)propionic acid (MPP) was synthesised by a direct reaction method using magnesium oxide and MPP as precursors. A further coating of chitosan was applied on the external surface of MLHÀMPP nanocomposite to form a new material, named MLHÀMPP/chitosan nanocomposite. The XRD pattern showed an intense and sharp peak at basal spacing 18.9 A , proving that MPP anions were successfully intercalated into the interlayer gallery of MLH in a monolayer arrangement. The XRD pattern of the MLHÀMPP/chitosan nanocomposite shows similar peaks with the MLHÀMPP nanocomposite. The result was also supported by FTIR spectra and elemental analysis. TGA/DTG spectra showed that the thermal stabilities of the guest anion in the both nanocomposites were markedly enhanced. A controlled-release study of the MPP ion from the MLHÀMPP/chitosan nanocomposite showed a slower release compared to MLHÀMPP nanocomposite with an initial rapid release and slow release thereafter. Meanwhile, the release behaviours of MPP ions from both nanocomposites were governed by pseudo-second order kinetics. This result highlights the potential of the nanocomposite as an encapsulated material for the controlled-release formulation of MPP anions.

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Comparative study of microwave and conventional methods for the preparation and optical properties of novel MgO-micro and nano-structures

Cited by 237 publications

References 43 publications

MgO nanoparticles as antibacterial agent: preparation and activity

MgO nanoparticles as antibacterial agent: preparation and activity

Wideband luminescence from bandgap-matched Mg-based Si core-shell geometry nanocomposite

Development of a novel nanocomposite consisting of 3-(4-methoxyphenyl)propionic acid and magnesium layered hydroxide for controlled-release formulation

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