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Specific Ion Effects on Aggregation and Charging Properties of Boron Nitride Nanospheres
Langmuir ( IF 3.7 ) Pub Date : 2021-02-08 , DOI: 10.1021/acs.langmuir.0c03533 Tímea Hegedűs 1 , Dóra Takács 2 , Lívia Vásárhelyi 1 , István Szilágyi 2 , Zoltán Kónya 1, 3
Langmuir ( IF 3.7 ) Pub Date : 2021-02-08 , DOI: 10.1021/acs.langmuir.0c03533 Tímea Hegedűs 1 , Dóra Takács 2 , Lívia Vásárhelyi 1 , István Szilágyi 2 , Zoltán Kónya 1, 3
Affiliation
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The charging and aggregation properties of boron nitride nanospheres (BNNSs) were investigated in the presence of electrolytes of different compositions and valences in aqueous suspensions. The influence of mono- and multivalent cations (counterions) and anions (coions) on the colloidal stability of the negatively charged particles was studied over a wide range of salt concentrations. For monovalent ions, similar trends were determined in the stability and charging of the particles irrespective of the salt composition, i.e., no ion-specific effects were observed. Once multivalent counterions were involved, the critical coagulation concentrations (CCCs) decreased with the valence in line with the direct Schulze–Hardy rule. The dependence indicated an intermediate charge density for BNNSs. The influence of the coions on the CCCs was weaker and the destabilization ability followed the inverse Schulze–Hardy rule. The predominant interparticle forces were identified as electrical double-layer repulsion and van der Waals attraction. These findings offer useful information to design stable BNNS dispersions in various applications, where mono- and multivalent electrolytes or their mixtures are present in the samples.
中文翻译：
特定离子对氮化硼纳米球聚集和带电性能的影响
在水性悬浮液中存在不同组成和化合价的电解质的情况下，研究了氮化硼纳米球（BNNS）的带电和聚集性质。在较宽的盐浓度范围内，研究了单价和多价阳离子（抗衡离子）和阴离子（离子）对带负电粒子的胶体稳定性的影响。对于单价离子，无论盐的组成如何，都在颗粒的稳定性和带电性方面确定了相似的趋势，即未观察到离子特异性效应。一旦涉及多价抗衡离子，临界凝结浓度（CCCs）随化合价的降低而下降，这与Schulze-Hardy直接规则一致。该依赖性表明BNNS的中间电荷密度。离子对CCC的影响较弱，去稳定能力遵循Schulze-Hardy逆定律。主要的粒子间力被确定为双层电排斥和范德华力吸引。这些发现为在各种应用中设计稳定的BNNS分散体提供了有用的信息，其中样品中存在单价和多价电解质或其混合物。
更新日期：2021-02-23
中文翻译：
特定离子对氮化硼纳米球聚集和带电性能的影响
在水性悬浮液中存在不同组成和化合价的电解质的情况下，研究了氮化硼纳米球（BNNS）的带电和聚集性质。在较宽的盐浓度范围内，研究了单价和多价阳离子（抗衡离子）和阴离子（离子）对带负电粒子的胶体稳定性的影响。对于单价离子，无论盐的组成如何，都在颗粒的稳定性和带电性方面确定了相似的趋势，即未观察到离子特异性效应。一旦涉及多价抗衡离子，临界凝结浓度（CCCs）随化合价的降低而下降，这与Schulze-Hardy直接规则一致。该依赖性表明BNNS的中间电荷密度。离子对CCC的影响较弱，去稳定能力遵循Schulze-Hardy逆定律。主要的粒子间力被确定为双层电排斥和范德华力吸引。这些发现为在各种应用中设计稳定的BNNS分散体提供了有用的信息，其中样品中存在单价和多价电解质或其混合物。
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