Issue 26, 2019, Issue in Progress

The preparation of MgO nanopowders synthesized via an improved polyacrylamide gel method

Abstract

In order to address the issue of metal ion incorporation during polymerization, citric acid was used as a chelating agent to improve the polyacrylamide gel route. In the present work, MgO nanoparticles were synthesized via this improved method. The calcination temperature of the gel precursor containing magnesium nitrate was determined by thermogravimetry and differential scanning calorimetry (TG-DSC). The phases and microstructures of MgO nanopowders were identified via X-ray diffraction (XRD), transmission electron microscopy (TEM) and specific surface area measurements (BET). The results showed that the nanoparticles synthesized under 600 °C were pure, globular and about 5–20 nm in size with a narrow distribution. Furthermore, the coalescence and growth of the MgO nanograins were amazingly observed with increasing calcination temperatures and calcination time. The influence of calcination temperature on the morphology and growth behavior is greater than that of the calcination duration. The activation energy for grain growth was estimated to be 31.43 kJ mol−1, and the dominant growth mechanism was predicted to be related to the grain-rotation-induced grain coalescence (GRIGC) mechanism.

Graphical abstract: The preparation of MgO nanopowders synthesized via an improved polyacrylamide gel method

Article information

Article type
Paper
Submitted
15 Dec 2018
Accepted
12 Apr 2019
First published
14 May 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 14893-14898

The preparation of MgO nanopowders synthesized via an improved polyacrylamide gel method

X. Zhao, H. Yang, P. Wu, X. Huang and X. Wang, RSC Adv., 2019, 9, 14893 DOI: 10.1039/C8RA10292A

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