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Sensitivity of nanoparticles' stability at the point of zero charge (PZC)

机译:零电荷(PZC)时纳米颗粒稳定性的敏感性

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摘要

Since bare-nanoparticles (NPs) without stabilizers in aqueous phase are stabilized by electrostatic forces, pH control is easily used to influence the surface charge and hence the formation of aggregates or agglomerates. Therefore, herein, the sensitivity of bare-NPs' stability in aqueous phase was analyzed close to the point of zero charge (PZC) using six model NPs. The results demonstrated that the sensitivity of NPs' agglomeration/aggregation could be estimated by the diameter ratio (RD) between the primary and secondary particle sizes. Namely, if the primary particle size was almost identical to the hydrodynamic diameter (HDD), the agglomeration proceeded aggressively.
机译:由于在水相中没有稳定剂的裸纳米粒子(NPs)通过静电力得以稳定,因此很容易使用pH控制来影响表面电荷,从而形成聚集体或附聚物。因此,本文中,使用六个模型NP在接近零电荷点(PZC)的位置分析了裸NP在水相中的稳定性。结果表明,可以通过一次粒径和二次粒径之间的直径比(RD)估算NPs团聚/聚集的敏感性。即,如果一次粒径与流体动力学直径(HDD)几乎相同,则团聚进行得很积极。

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