Forced desorption of polymers from interfaces
Forced desorption of polymers from interfaces
复制标题
聚合物从界面强制解吸
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Hans Jürgen Kreuzer
中科院分区：
文献类型：
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作者：
Douglas B. Staple;M. Geisler;T. Hugel;L. Kreplak;Hans Jürgen Kreuzer
在过去的十年中，它已成为可能直接测量的吸附力的聚合物与固体表面接触，使用单分子力谱。在物理吸附或非共价键合的聚合物系统中，经常观察到力-延伸曲线中的平台力。如果一个分子被拉得比内部弛豫快，那么就可以观察到非平衡效应。在这里，我们调查这些影响使用统计力学模型和实验与蜘蛛丝多肽。我们提出的证据表明，大多数实验表明高原部队是不平衡的。我们发现，占主导地位的非平衡效应是，脱离高度hmax（v）的增加与拉速v.基于主方程方法内的非平衡模型，我们显示出S形依赖的脱离高度上的悬臂的拉速，同意与实验数据的蜘蛛丝多肽。我们还表明，在理论和实验中的悬臂力常数与平台力分离的斜率。
In the past decade it has become possible to directly measure the adsorption force of a polymer in contact with a solid surface using single-molecule force spectroscopy. A plateau force in the force–extension curve is often observed in systems of physisorbed or noncovalently bonded polymers. If a molecule is pulled quickly compared to internal relaxation, then nonequilibrium effects can be observed. Here we investigate these effects using statistical mechanical models and experiments with a spider silk polypeptide. We present evidence that most experiments showing plateau forces are done out of equilibrium. We find that the dominant nonequilibrium effect is that the detachment height hmax(v) increases with pulling speed v. Based on a nonequilibrium model within a master-equation approach, we show the sigmoidal dependence of the detachment height on the pulling speed of the cantilever, agreeing with experimental data on a spider silk polypeptide. We also show that the slope with which the plateau forces detach is given by the cantilever force constant in both theory and experiment.
影响因子：
10.8
作者：
Manohar S;Mantz AR;Bancroft KE;Hui CY;Jagota A;Vezenov DV
通讯作者：
Vezenov DV