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Gold Nanoparticle Layers on Polystyrene Microspheres of Controlled Structure and Electrokinetic Properties
Langmuir ( IF 3.7 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1021/acs.langmuir.8b01491 Magdalena Oćwieja 1 , Dawid Lupa 1 , Zbigniew Adamczyk 1
Langmuir ( IF 3.7 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1021/acs.langmuir.8b01491 Magdalena Oćwieja 1 , Dawid Lupa 1 , Zbigniew Adamczyk 1
Affiliation
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Formation of positively charged gold nanoparticle layers on polystyrene microparticles (PSMs600) was studied using the electrokinetic and the concentration depletion methods based on atomic force microscopy (AFM) and scanning electron microscopy (SEM) imaging. Primarily, the dependence of electrophoretic mobility of microparticles on the gold nanoparticle concentration in the suspension was measured. These results were quantitatively interpreted in terms of the three-dimensional electrokinetic model. This allowed to derive a formula for calculating the coverage of nanoparticles under in situ conditions whose validity was confirmed by direct SEM imaging of deposited gold nanoparticles (AuNPs). Additionally, the maximum coverage of gold nanoparticles for various ionic strengths was determined using a concentration depletion method based on AFM imaging of residual particles deposited on the silica substrate. The maximum coverage increased with ionic strength attaining a value of 0.35 for the ionic strength of 3 × 10–3 M. This effect was attributed to the decreasing range of lateral electrostatic interactions among deposited particles. The electrokinetic properties of the gold nanoparticle layers were also evaluated in pH cycling experiments that confirmed their stability. Beyond significance to basic science, the new data acquired in this work confirm the feasibility of preparing gold nanoparticle layers on polymer microparticles characterized by a controlled structure, coverage, and electrokinetic properties.
中文翻译：
可控结构和电动特性的聚苯乙烯微球上的金纳米颗粒层
使用基于原子力显微镜（AFM）和扫描电子显微镜（SEM）成像的电动和浓度耗尽方法，研究了在聚苯乙烯微粒（PSMs600）上形成带正电的金纳米粒子层。首先，测量了微粒的电泳迁移率对悬浮液中金纳米粒子浓度的依赖性。这些结果根据三维电动模型进行了定量解释。这允许导出用于在原位条件下计算纳米颗粒覆盖率的公式，其有效性通过沉积金纳米颗粒（AuNPs）的直接SEM成像得到证实。此外，使用基于原子力显微镜（AFM）成像沉积在二氧化硅基质上的残留颗粒的浓度耗尽方法，确定了各种离子强度下金纳米颗粒的最大覆盖率。当离子强度为3×10时，最大覆盖率随离子强度达到0.35的值而增加–3M。该效应归因于沉积颗粒之间横向静电相互作用范围的减小。金纳米颗粒层的动电性能也在pH循环实验中进行了评估，证实了其稳定性。除了对基础科学的意义外，这项工作中获得的新数据还证实了在具有受控结构，覆盖范围和电动特性的聚合物微粒上制备金纳米颗粒层的可行性。
更新日期：2018-06-25
中文翻译：
可控结构和电动特性的聚苯乙烯微球上的金纳米颗粒层
使用基于原子力显微镜（AFM）和扫描电子显微镜（SEM）成像的电动和浓度耗尽方法，研究了在聚苯乙烯微粒（PSMs600）上形成带正电的金纳米粒子层。首先，测量了微粒的电泳迁移率对悬浮液中金纳米粒子浓度的依赖性。这些结果根据三维电动模型进行了定量解释。这允许导出用于在原位条件下计算纳米颗粒覆盖率的公式，其有效性通过沉积金纳米颗粒（AuNPs）的直接SEM成像得到证实。此外，使用基于原子力显微镜（AFM）成像沉积在二氧化硅基质上的残留颗粒的浓度耗尽方法，确定了各种离子强度下金纳米颗粒的最大覆盖率。当离子强度为3×10时，最大覆盖率随离子强度达到0.35的值而增加–3M。该效应归因于沉积颗粒之间横向静电相互作用范围的减小。金纳米颗粒层的动电性能也在pH循环实验中进行了评估，证实了其稳定性。除了对基础科学的意义外，这项工作中获得的新数据还证实了在具有受控结构，覆盖范围和电动特性的聚合物微粒上制备金纳米颗粒层的可行性。
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