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arXiv 2507.00549cond-mat.softphysics.bio-ph
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电荷调节对由聚电解质介导的纳米颗粒相互作用的影响

Charge Regulation Effect on Nanoparticles Interaction Mediated by Polyelectrolyte

Indian Institute of Technology Jodhpur(印度焦浦尔理工学院);University of Chinese Academy of Sciences(中国科学院大学);Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所);University of Ljubljana(卢布尔雅那大学)

Vijay Yadav, Prabhat Kumar Jaiswal, Rudolf Podgornik, Sunita Kumari

AI总结:

研究电荷调节对由反电荷聚电解质介导的纳米颗粒相互作用的影响,通过混合CR分子动力学模拟发现电荷调节增强聚电解质吸附,导致弱排斥,而常电荷模型则产生更强的吸引力。

摘要:

利用带电聚合物精确控制表面电荷的能力对于许多纳米技术应用至关重要,能够设计和制造具有定制性质和功能的材料。本文研究了电荷调节(CR)对由反电荷聚电解质(PE)介导的两个纳米颗粒(NPs)相互作用的影响。为此,我们采用混合CR蒙特卡洛/分子动力学模拟框架,系统地探讨了pH、盐浓度和聚合物链长对纳米颗粒表面电荷行为的影响。此外,我们还进行了在恒定电荷(CC)条件下的分子模拟。研究结果表明,CR比CC情况增强了PE在纳米颗粒表面的吸附,其中聚合物桥接在广泛的纳米颗粒表面分离范围内占主导地位。这种增强的吸附在CR条件下导致由渗透力驱动的弱净排斥。相比之下,CC模型由于桥接力产生更强的净吸引力。此外,我们发现CR效应在低盐浓度下更为显著,而在高盐浓度下,反离子屏蔽在CR和CC情况下均占主导地位,削弱了CR效应。这些发现突显了在复杂生物化学环境中表征纳米颗粒相互作用时,纳入电荷调节的重要性,特别是在低盐浓度情况下。

英文摘要:

The ability to precisely control surface charge using charged polymers is fundamental to many nanotechnology applications, enabling the design and fabrication of materials with tailored properties and functionalities. Here, we study the effect of charge regulation (CR) on the interaction between two nanoparticles (NPs) mediated by an oppositely charged polyelectrolyte (PE) in an electrolyte solution. To this end, we employ a hybrid CR Monte Carlo / molecular dynamics simulation framework to systematically explore the effects of pH, salt concentration, and polymer chain length on NP surface charge behavior. For comparison, we also conduct molecular simulations under constant charge (CC) conditions. Our results reveal that CR enhances PE adsorption onto NP surfaces compared to the CC case, where polymer bridging dominates across a wide range of NP intersurface separations. This enhanced adsorption under CR leads to a weak net repulsion driven by osmotic forces. In contrast, the CC model yields a stronger net attraction due to the bridging force. Furthermore, we find that the CR effects are more pronounced at low salt concentration, whereas at high salt concentration, counterion screening dominates in both CR and CC cases, diminishing the CR effect. These findings highlight the importance of incorporating charge regulation in characterizing nanoparticle interactions within a complex biochemical environment, particularly in low salt concentrations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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