Abstract
MgO is an important inorganic material, which can be used in many aspects, such as catalyst, toxic-waste remediation agent, adsorbent, and others. In order to make use of MgO, nano-MgO was prepared by ultrasonic method using Mg (CH3COO)2.2H2O as precursor, NaOH aqueous solution as precipitant in this paper. Effect factors on MgO nano-particle size were investigated. Characteristics of samples were measured by TGA, XRD, TEM, and others techniques. The results showed that the size of nano-MgO about 4 nm could be obtained under the following conditions (ultrasonic time 20 min, ultrasonic power 250 W, titration rate of NaOH 0.25 mL/min, NaOH concentration 0.48 mol/L, calcinations temperature 410 °C, calcination time 1.5 h, heating rate of calcination 5 °C/min). It was a very simple and effective method to prepare nano-MgO.
Highlights
The alteration of the bulk electronic structure of nanosized materials causes change in the total energy of the system, so that, ignoring entropy considerations, it will thermodynamically stabilize the reduced scale system relative to that of normal bulk crystals
The surface area to volume ratio (S/V) and the specific surface area of a system are inversely proportional to particle size
This paper presented an ultrasonic route for preparing MgO nano-particles
Summary
The alteration of the bulk electronic structure of nanosized materials causes change in the total energy of the system, so that, ignoring entropy considerations, it will thermodynamically stabilize the reduced scale system relative to that of normal bulk crystals. Reduction of the system size may change the chemical reactivity and physical properties such as electrical, thermal, optical and magnetic characteristics [1, 2] Due to their different physical and chemical properties, nano-structured materials have received increasing attention in various fields of science and technology [3,4,5]. A variety of physicochemical methods, including metal evaporation [6], spray pyrolysis [7], sol–gel [8], hydrothermal synthesis [9] and electrochemical methods [10], have been used to produce nanometer-sized materials
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