水下微粒粘附到软水合表面的动力学：通过时间相关的 AFM 力谱进行建模和分析,Journal of Colloid and Interface Science

当前位置： X-MOL 学术 › J. Colloid Interface Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

水下微粒粘附到软水合表面的动力学：通过时间相关的 AFM 力谱进行建模和分析
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2023-08-01 , DOI: 10.1016/j.jcis.2023.07.185
Aleksandr Leontev ₁ , Lina Rozental ₁ , Viatcheslav Freger ₂

Affiliation

了解微粒和活细胞在表面上的附着和分离对于制定防污策略至关重要。水凝胶涂层由于其柔软性和高含水量而在减少污垢和颗粒粘附方面显示出前景，但所涉及的机制是动态且复杂的，并且相关参数不易获得。基于 AFM 的胶体探针颗粒力谱 (FS) 实验是评估粘合和机械松弛动力学的直接方法，但其解释和建模一直具有挑战性。本研究提出并检验了几种动态模型，适用于水凝胶表面模型探针颗粒对 FS 结果的定量分析。 FS 使用聚乙二醇 (PEG) 水凝胶和聚苯乙烯微球进行，包括将颗粒附着在水凝胶表面 ()、用恒定的力将颗粒固定在表面上不同的时间 () 以及将颗粒拉离表面 ()。发现经典 JKR 模型的粘弹性扩展（粘附能在接触区域上不均匀分布并在其圆周上消失）准确地描述了所有 FS 实验，并产生了物理一致的粘弹性和粘附动态参数，随着停留时间和施加的力而稳定变化。观察到的时间演变和力依赖性被合理化为接触区域渗透和渗透机械弛豫的组合。

"点击查看英文标题和摘要"

Dynamics of underwater microparticle adhesion to soft hydrated surfaces: Modeling and analysis by time-dependent AFM force spectroscopy

Understanding the attachment and detachment of microparticles and living cells to surfaces is crucial for developing antifouling strategies. Hydrogel coatings have shown promise in reducing fouling and particle adhesion due to their softness and high water content, yet the mechanisms involved are dynamic and complex, and relevant parameters are not easily accessible. AFM-based force spectroscopy (FS) experiments with colloidal probe particles is a direct way of evaluating adhesive and mechanical relaxational dynamics, yet their interpretation and modeling has been challenging. The present study proposes and examines several dynamic models, suitable for quantitative analysis of FS results with model probe particle on hydrogels surfaces. FS were performed using polyethylene glycol (PEG) hydrogels and polystyrene microspheres including particle attachement to the hydrogel surface (), holding the particle on the surface with a constant force for variable times () and pulling the particle away from the surface () It was found that a viscoelastic extension of the classical JKR model with energy of adhesion unevenly distributed over the contact area and vanishing at its circumferences accurately described all FS experiments and yielded physically consistent viscoelastic and adhesive dynamic parameters, steadily changing with dwell time and applied force. The observed time evolution and force dependence were rationalized as combination of osmotic and osmo-mechnical relaxation in the contact region.

更新日期：2023-08-01

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南