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

机译：通过改进的聚丙烯酰胺凝胶法合成的MgO纳米粉末的制备

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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.
机译：为了解决聚合过程中金属离子掺入的问题，用作螯合剂以改善聚丙烯酰胺凝胶途径。在本作工作中，通过这种改进的方法合成MgO纳米粒子。通过热再生和差示扫描量热法（TG-DSC）测定含有硝酸镁的凝胶前体的煅烧温度。通过X射线衍射（XRD），透射电子显微镜（TEM）和特定表面积测量鉴定MgO纳米粉粉的阶段和微观结构（BET）。结果表明，在600℃下合成的纳米颗粒纯度，球状和约5-20nm的尺寸窄，分布窄。此外，随着煅烧温度和煅烧时间的增加，令人惊讶地观察MgO纳米的聚结和生长。煅烧温度对形态和生长行为的影响大于煅烧持续时间的影响。估计晶粒生长的活化能估计为31.43 kJ摩尔〜（α1），预计主要生长机制与晶粒旋转诱导的晶粒聚结（GRIGC）机制有关。

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