Recent studies suggested that the interactions between particles can induce aggregative nucleation and growth processes beyond those predicted by the traditional LaMer model of nanoparticle formation, but their nucleation and growth processes are still unclear. Here, we report a simple way to control the interaction between nanoparticles by manipulating the oleylamine (OAm) adsorbed on the surface of the nanoparticles. The size distributions of Ag nanoparticles produced at different reaction pressures were monitored as evidence for aggregative growth. From these kinetic data, the aggregative nucleation rate ( Γ ) of primary Ag nanoparticles under a 0.01 MPa was demonstrated to be faster than that under atmospheric pressure. This leads to a higher uniformity of Ag nanoparticles in a shorter time (10 min) than that achievable with previous methods. Furthermore, Ag nanoparticles supported on TiO 2 exhibited a remarkable performance in the catalytic reduction of 4-nitrophenol (4-NP). After 4 min, 4-NP was completely reduced into 4-aminophenol (4-AP).

中文翻译：

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压力控制是调节纳米颗粒聚集生长的有效方法

最近的研究表明，粒子之间的相互作用可以诱导聚集成核和生长过程，超出了传统的纳米粒子形成 LaMer 模型预测的范围，但它们的成核和生长过程仍不清楚。在这里，我们报告了一种通过操纵吸附在纳米颗粒表面上的油胺 (OAm) 来控制纳米颗粒之间相互作用的简单方法。监测在不同反应压力下产生的 Ag 纳米颗粒的尺寸分布作为聚集体生长的证据。从这些动力学数据可以看出，初级 Ag 纳米粒子在 0.01 MPa 下的聚集成核速率 (Γ) 比在大气压下更快。与以前的方法相比，这导致在更短的时间内（10 分钟）获得更高的 Ag 纳米粒子均匀性。此外，负载在TiO 2 上的Ag纳米颗粒在催化还原4-硝基苯酚（4-NP）方面表现出显着的性能。4 分钟后，4-NP 完全还原为 4-氨基苯酚 (4-AP)。