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首页> 外文期刊>RSC Advances >Control of interface interactions between natural rubber and solid surfaces through charge effects: an AFM study in force spectroscopic mode
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Control of interface interactions between natural rubber and solid surfaces through charge effects: an AFM study in force spectroscopic mode

机译：通过电荷效应控制天然橡胶与固体表面之间的界面相互作用：力谱模式下的AFM研究

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This work presents a detailed investigation of interface interactions between natural rubber (NR) particles and solid surfaces in aqueous medium at high ionic strength (0.1 M) using AFM in fast force spectroscopy mode. In this study, an original method for fixing the NR on the substrate was developed. This avoided the usual perturbations common in standard immobilization techniques. We proved that the adhesion process of the NR is monitored by slight changes in the surface charge state of the contacting solid surfaces made of silicon oxide or silicon nitride. The results were interpreted using Dynamic Force Spectroscopy theory, with the introduction of a supplementary term describing the electrostatic energy. Furthermore, these experiments revealed that adhesion between NR and tip was time dependent in a cumulative process. In addition, an increase of the adhesion between NR and AFM tip with the size of the rubber particles was measured. This was related to the higher concentration in lipids versus proteins for larger NR particles. These results are of great importance both for practical applications in solution-based industrial processes and to the fundamental knowledge of adhesion process involved for biopolymers or living cells.
机译：这项工作提出了使用快速力光谱模式下的AFM在高离子强度（0.1 M）下天然橡胶（NR）颗粒与水性介质中固体表面之间的界面相互作用的详细研究。在这项研究中，开发了一种将NR固定在基材上的原始方法。这避免了标准固定技术中常见的常见扰动。我们证明了通过由氧化硅或氮化硅制成的接触固体表面的表面电荷状态的细微变化，可以监控NR的粘附过程。使用动态力谱理论解释了结果，并引入了描述静电能的补充术语。此外，这些实验表明，在累积过程中，NR和吸头之间的粘附力与时间有关。另外，测量了NR和AFM尖端之间的粘附力随橡胶颗粒尺寸的增加。这与较大的NR颗粒中脂质对蛋白的浓度较高有关。这些结果对于在基于溶液的工业过程中的实际应用以及对于生物聚合物或活细胞所涉及的粘附过程的基础知识都非常重要。

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