Effect of Precursor Concentration of MgO Nanostructure by using Sol-Gel Method

Mechanics, Materials Science & Engineering, May 2017

ISSN 2412-5954

Effect of Precursor Concentration of MgO Nanostructure by using Sol-Gel Method11 V.T. Srisuvetha1, 2 ,a, S.L. Rayar2, G. Shanthi1, A. Dhayal Raj3, S. Karthikeyan4 1

Depatment of Physi

2 3

Depatment of Physics, Sacred heart college, Tirupattur, Vellore (DT), Tamilnadu, India

4

Department of Physics Periyar University PG Extension Centre, Dharmapuri, India

a

srisuvetha16@gmail.com DOI 10.2412/mmse.76.30.166 provided by Seo4U.link

Keywords: magnesium oxide, sol-gel method, oxalic acid, XRD, SEM, UV, FTIR, EDS.

ABSTRACT. MgO thin flims have been prepared on substrates by a novel and simple sol-gel method using magnesium nitrate and collusion as starting material.The MgO nano catalyst with good sensor crystallization were obtained after -gel method. The method involves the hydrolysis of magnesium alkoxide in the presence of acid or basic catalysts followed by a Oxalic acid reaction. The synthesized solids were characterized by IR spectroscopy X-ray diffraction electron microscopy. Ultraviolet visible absorbance measurement photoluminescence and Raman scattering spectra. X-ray diffraction (XRD) characterization showed the formation of smaller particles after sol gel irradiation the structure and morphology of the MgO particles were analyzed byXRD. These articles were used for FTIR spectroscopic measurement and spectra were collected. In EDS we calculated the peak intensity the SEM the images of metal oxide.UV (Ultra Violet) refers to adsorption spectroscopy optical properties of assorption, band gap energy.This means if use light in the visible and adjacent ranges.

Introduction. MgO is highly ionic insulating crystalline solid with structure, which has excellent properties such as chemical inertness, electrical insulation, optical transpare high temperature stability, high thermal conductivity and secondary electron emission.

In the present investigation the sol gel method was adopted to achieve a homogeneous disperation of MgO and the effects of MgO on mulltization sinterability& physical properties were investigated manganese works as luminescence centers in oxide& non-oxide materials, studies of green, orange, red phosphors containing manganese have been performed for a long periods. Magnesium oxide is a versatile oxide material with respect to its wide range of utilization such as in catalysis, hazardous waste treatment, anti microbial materials and refractory materials.Recently MgO has attracted tremendous attention on account of these immense application. Particularly in the field of catalysis, MgO has become promising materials in the roles of both catalyst and catalyst support in many organic reactions.

Methods Sol Gel. In materials science, the sol-gel process is a method for producing solid materials from small molecules. The method is used for the fabrication of metal oxides, especially the oxides of silicon and titanium. The process involves conversion of monomers into a colloidal solution (sol) that acts as the precursor for an integrated network (or gel) of either discrete particles or network polymers.

Typical precursors are metal alkoxides.

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Mechanics, Materials Science & Engineering, May 2017

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In this chemical procedure, the 'sol' (or solution) gradually evolves towards the formation of a gellike diphasic system containing both a liquid phase and solid phase whose morphologies range from discrete particles to continuous polymer networks[39]. In the case of the colloid, the volume fraction of particles (or particle density) may be so low that a significant amount of fluid may need to be removed initially for the gel-like properties to be recognized. This can be accomplished in any number of ways.

Experimental.

Magnesium acetate tetrahydrate 150 ml ethanol Stirr half an hr

Oxalic acid

Stir half an hour

Ageing overnight (24hr)

Motor & piston 1 hr

Magnesium Oxide (MgO) is an important oxide material that used in many application such as gas sensor, catalysis supports, toxic wastes remediation, refractory materials and adsorbents.The commercial MgO particles have been prepared via thermal decomposition of Magnesium salts or magnesium hydroxide. The resulting MgO has large particle size and small surface area, which are disadvantages for use in some applications, Therfore, Many synthesis methods have been developed to prepare nano sized of MgO with large surface area with controlled morphology as reported in. A Sol-gel method is one of the promising approaches due to its simplicity, Cost-effective, high yield of final product and low reaction temperature.

The organic salts such as magnesium methoxide and magnesium ethoxide are rare used in sol-rel reaction for formation of MgO nanoparticles and these discussed in a few reports.As an alternative, inorganic magnesium salts are reacted with different complexing agents and give various precursors before decomposed to MgO.However, the sol-gel method used is usually caused agglomeration of MgO particles, which hinder its wide applications The controlled synthesis for MgO with specific morphology, small crystallite size and large surface area are challenging aspects to be studied.Magnesium acetate tetrahydrate added with 150ml ethanol stirred with half an hour and just added polyethylene glycol and once again stirred with half an hour Results and Discussion.

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SEM Morphology. SEM images it was found that both of the nano structure represent sphere like and rounded morphology. According to these results it can be mentioned that SEM results are in good agreement with particles size distribution and surface area. MgO nano scale particles interconnected with each other such that no clear bound aries exist between one another. The average range of the particle for pure polyethylene glycol is 18nm. Fig. 1 (a). The average range of the particle for with calcination polyethylene glycol is 25nm. Fig. 1 (b). The average range of the particle for without calcinations polyethylene glycol is 28nm. Fig. 1 (c). The Morphology of the Mgo particles is in nanoscale range. Due to sol gel method, the sizes of these particles are in the range.

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a)

b)

b)

c)

c)

EDS consists of magnesium, oxygen and iron peaks with respect to the analyzed depth, the comparision between the intensity of magnesium oxygen and under laying iron peaks reveals that the insulating

FTIR FTIR spectroscopy was used to identify the functional group in the synthesized MgO nanoparticles.

Functional group with the strong dipole give rise to strong absorption in the region. Different molecular groups present in the MgO are identified with the Vibrational frequencies.The IR spectrum of MgO was recorded with a BRUKER.Fourier transform Infrared spectrometer in the range of 6004000cm-1.The observed spectrum of synthesized MgO is present in Fig. (a and b)corresponding to samples prepared with Ph values respectively.The strong absorption peaks in the metal-oxide vibrations.Thus can be correlated to Mg-O vibrations. The Mg-Ovibrations around 890cm-1 are in agreement with the earlier reports.The FTIR spectra of coated powders before the final heating it has been proposed that the preparation of metal oxide by sol-gel methods to high hydroxylated materials.

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Thin insulation leads to the densities of the MgO insulated samples and uncoated compacts to be close to each other.Also the nature of the insulating layer can be assessed by FTIR analysis.

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a)

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Summary. EDS and X-ray analysis, FTIR spectra and density measurements showed that the particles surface layer contained a MgO insulating layer with uniform coverage of the powder surfaces after sol-gel processing. The MgO worked effectively on band gap engineering irrespective structure.In this work, the sol-gel methods for heat treated soft magnetic composites with a thin MgO insulation layer.MgO insulating has higher thermal stability than polyethylene glycol. The produced nanostructure particles were characterized to determine particle size distribution, surface properties.

It is well known that various factors, such as crystalline size, morphology. Further more the nano structure particles can be easily produced through sol gel method technique in one-step, whereas it is unable with sol-gel method that this conditions influences production cost. The importance of the present articles lies is establishing that MgO supports can be obtained by the sol-gel method. The effects of these MgO supports on catalytic activity will be dealt with in future work.

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