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首页> 外文期刊>Advanced Functional Materials >Fabrication of hollow inorganic microspheres by chemically induced self-transformation
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Fabrication of hollow inorganic microspheres by chemically induced self-transformation

机译：化学诱导自转化制备空心无机微球

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摘要

Two contrasting approaches, involving either polymer-mediated or fluoride-mediated self-transformation of amorphous solid particles, are described as general routes to the fabrication of hollow inorganic microspheres. Firstly, calcium carbonate and strontium tungstate hollow microspheres are fabricated in high yield using sodium poly (4-styrenesulfonate) as a stabilizing agent for the formation and subsequent transformation of amorphous primary particles. Transformation occurs with retention of the bulk morphology by localized Ostwald ripening, in which preferential dissolution of the particle interior is coupled to the deposition of a porous external shell of loosely packed nanocrystals. Secondly, the fabrication process is extended to relatively stable amorphous microspheres, such as TiO2 and SnO2, by increasing the surface reactivity of the solid precursor particles. For this, fluoride ions, in the form of NH4F and SnF2, are used to produce well-defined hollow spheroids of nanocrystalline TiO2 and SnO2, respectively. Our results suggest that the chemical self-transformation of precursor objects under morphologically invariant conditions could be of general applicability in the preparation of a wide range of nanoparticle-based hollow architectures for technological and biomedical applications.
机译：两种相反的方法，涉及聚合物介导的或氟化物介导的无定形固体颗粒的自转化，被描述为制造空心无机微球的一般途径。首先，使用聚（4-苯乙烯磺酸钠）作为稳定剂，以高产率制备碳酸钙和钨酸锶空心空心球，以形成和随后转化无定形初级粒子。通过局部奥斯特瓦尔德熟化而发生保留主体形态的转变，其中颗粒内部的优先溶解与疏松堆积的纳米晶体的多孔外壳的沉积有关。其次，通过增加固体前体颗粒的表面反应性，将制造过程扩展到相对稳定的非晶态微球，如TiO2和SnO2。为此，以NH4F和SnF2的形式出现的氟离子分别用于产生定义明确的纳米晶TiO2和SnO2的空心球体。我们的结果表明，在形态不变的条件下，前体物体的化学自转化可能在制备用于技术和生物医学应用的各种基于纳米粒子的中空结构中具有普遍的适用性。

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