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The effect of temperature on the aggregation kinetics of partially bare gold nanoparticles

机译：温度对部分光金纳米粒子聚集动力学的影响

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Gold nanoparticles (Au NPs) without stabilizers are known to be unstable towards aggregation. Similar observations have been made with respect to the aqueous dispersion of partially bare Au NPs. Here, we report the influence of temperature on the kinetics of this aggregation process following controlled removal of the tri-sodium citrate stabilizer by dialysis. UV-visible spectroscopy was used to monitor the aggregation of the Au NPs in the temperature range of 20–60 °C. It was found that the rate of aggregation had increased with temperature. Detailed kinetic analysis showed that the aggregation process was reaction limited, demonstrating first order kinetics with an activation energy of 36.2 ± 3.0 kJ mol ~(?1) . TEM measurements confirmed the formation of aggregated structures of Au NPs with various morphologies, resulting in a varying extent of coalescence at different temperatures. During coalescence the particles either underwent oriented attachment via sharing common lattice planes or resulted in non-faceted attachment through twinning. Based on our observations a model is proposed taking into account the various probable steps involved in the formation of NP aggregates and the underlying reason towards the barrier to activation.
机译：已知没有稳定剂的金纳米颗粒（Au nps）朝向聚集不稳定。已经相对于部分裸AUNP的水分散体进行了类似的观察结果。在这里，我们通过透析通过透析向去除三柠檬酸钠稳定剂进行控制后，对温度对该聚集过程的动力学的影响。 UV可见光光谱用于监测20-60℃的温度范围内Au NP的聚集。发现聚集速率随温度而增加。详细的动力学分析表明，聚集过程是反应有限的，展示一种活化能量为36.2±3.0kJ摩尔〜（α1）的第一阶动力学。 TEM测量证实了具有各种形态的Au nps聚集结构的形成，导致不同温度下的聚结的不同程度。在聚结期间，通过共用公共晶片平面或通过Twinning导致非刻面附着的颗粒进行取向附着。基于我们的观察，提出了一种模型，考虑到涉及NP聚集体形成的各种可能的步骤以及朝向激活屏障的潜在原因。

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