摘要
γ—Fe2O3纳米粒子因其在磁性、催化、气敏、生物医学等领域的广泛应用而备受青睐。传统制备γ—Fe2O3粒子的方法是在适当温度下加热OL—FeOOH或γ-FeOOH,所得粒子粒径在微米级。近年来随着纳米技术的发展,制备纳米γ—Fe2O3粒子的方法也逐年增加。溶胶凝胶法是制备纳米粒子的一种优良的方法,具有反应温度低、反应过程易于控制、产物纯度高、粒度分布均匀、细小等优点,但该方法需要较长的成胶时间,生产周期长。低温湿固相反应不使用溶剂,具有高选择性、高产率、工艺过程简单等优点,已成为人们制备新型固体材料的主要手段之一。本文将低温湿固相反应与溶胶凝胶方法相结合,用硝酸铁、酒石酸为原料,首先制备出铁的酒石酸非晶态配合物前驱体,然后再将干凝胶状的前驱体在一定的温度下分解得到纳米γ—Fe2O3粒子,并对其进行表征。
In this paper, ultrafine powder of γ-Fe2O3 was synthesized from Fe( NO3 )3 · 9H2O and tartaric acid by the method of wet-solid state reaction -get process at low temperature. At the same time , the reaction mechanism and the structure of the samples were investigated by FT-IR, XRD and TEM. The result of FT-IR showed that Fe^3+ ions could react with tartaric acid by grinding for 30 minutes. The XRD analysis of the samples sintered at different temperatures indicated that pure γ-Fe2O3 phase was obtained after the dried gel was calcined at 300℃ and 400℃ for 1 h, respectively. According to Scherrer formula and TEM analysis , the ferrite particle size was about 20 -30nm when the dried gel decomposed at 300℃ for 1 h.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2007年第2期176-178,共3页
Chemical Research and Application
基金
云南省教育厅科研基金(04Y216A)项目资助
云南大学校研基金(2003Q006A)项目资助
云南省自然科学基金(2006E0009Q)项目资助
作者简介
联系人简介:杨项军(1974-)。男,讲师,主要从事纳米磁性材料研究。Email:gnft@vnu.edu.cn