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麦克默瑞提克(上海)仪器有限公司 2015-02-16 点击675次
每周分享:an acid-free route for the facile synthesis of iron-functionalized mesoporous silicas: transformation between hollow nanospheres and cage-like mesostructures
今天给大家分享的是2014年5月份 《microporous and mesoporous materials》上发表的一篇名为:an acid-free route for the facile synthesis of iron-functionalized mesoporous silicas: transformation between hollow nanospheres and cage-like mesostructures
文章摘要如下:
iron-substituted silicas with hollow nanospherical morphology and cage-like mesostructure have been synthesized using triblock copolymer f127 as surfactant and tetramethoxysilane (tmos) as silica source with no necessary addition of mineral acids. iron-functionalized hollow nanospheres were obtained using fe(acac)3 as iron source. when fe(no3)3 was employed as iron source, iron-containing cage-like fdu-12 mesostructure and hollow nanospheres were formed with fe/si molar ratio lower than 0.008 and higher than 0.015, respectively. the formation of hollow spheres at high fe/si ratio can be regarded as gradually dissociation of nanocages from fe-fdu-12. the structure of the iron centers was determined by spectroscopic methods (uv–vis and uv–raman measurements) and by elemental analyses. the facile structural evolution between cage-like and nanospherical structures may be helpful for further understanding the formation mechanism of mesoporous silicas.
该文章中材料表征采用的是美国麦克仪器autochem 2920
详情可参考下面链接:
http://www.sciencedirect.com/science/article/pii/s1387181114000456