Interfacial water confined in the microemulsions shows behaviors different to normal bulk water and could affect the reactions involved at the interface. In this work, the content of interfacial and bulk water in the parental microemulsions for the reactions was first quantitatively determined by Fourier-transform infrared (FTIR) spectroscopy. The nucleation and growth of PbCrO₄ nanoparticles in the microemulsions were studied on the basis of the FTIR results. By controlling the water ratio in micellar droplets, amorphous nanoparticles were obtained in the interfacial water, while nanocrystals were produced in the bulk water. The amorphous nanoparticles with defined shapes are quite stable in the microemulsion solution and show no transformation to crystallites for several days. This work offers a delicate way to control the metastable amorphous precursor for follow-up crystallization.

中文翻译：

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基于界面水定量控制的无定形 PbCrO4 纳米颗粒的形成

限制在微乳液中的界面水表现出与普通本体水不同的行为，并可能影响界面处所涉及的反应。在这项工作中，反应的母体微乳液中界面和本体水的含量首先通过傅里叶变换红外 (FTIR) 光谱进行定量测定。PbCrO ₄的成核和生长在 FTIR 结果的基础上研究了微乳液中的纳米颗粒。通过控制胶束液滴中的水比例，在界面水中获得无定形纳米粒子，而在本体水中产生纳米晶体。具有确定形状的无定形纳米粒子在微乳液溶液中非常稳定，并且在几天内没有显示出向微晶的转变。这项工作提供了一种巧妙的方法来控制用于后续结晶的亚稳态无定形前体。