Intermolecular Interactions of Polymer Molecules Determined by Single-Molecule Force Spectroscopy
Intermolecular Interactions of Polymer Molecules Determined by Single-Molecule Force Spectroscopy
复制标题
单分子力谱测定聚合物分子的分子间相互作用
DOI：
10.1021/ma051415d
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发表时间：
2005
期刊：
影响因子：
5.5
通讯作者：
A. Zumbusch
中科院分区：
文献类型：
--
作者：
A. Scherer;Chunqing Zhou;J. Michaelis;C. Bräuchle;A. Zumbusch
单分子水平上的力谱允许研究合成和天然聚合物的分子内以及域间和分子间的相互作用。在这些实验中，单个分子通常在两个强连接点之间拉伸。然后，力随着延伸的增加而增加。然而，在某些条件下，力-延伸曲线会导致力平台;在恒定力下观察到延伸增加。这些平台不依赖于牵拉速度，因此指示平衡时的转变。在这里，我们提出了单分子数据，其中羧甲基纤维素（CMC）分子被拉出的聚合物膜到一个不良溶剂。由此产生的力-延伸曲线不仅显示了一个，而且显示了多达七个力平台。从一个力平台到下一个力平台的台阶高度是不均匀的，但遵循特征间距。这是首次报道聚合物分子的不均匀力平台。一个简单的聚合物模型。
Force spectroscopy on the single-molecule level allows the investigation of intramolecular as well as interdomain and intermolecular interactions of both synthetic and natural polymers. In these experiments, a single molecule is usually stretched between two strong attachment points. The force then increases with increasing extension. Under certain conditions, however, force−extension curves result in force plateaus; an increase in extension is observed under constant force. These plateaus do not depend on pulling speed and therefore indicate transitions at equilibrium. Here we present single-molecule data where carboxymethycellulose (CMC) molecules are pulled out of a polymer film into a poor solvent. The resulting force−extension curves show not only one but up to seven force plateaus. The step height from one force plateau to the next is nonuniform but follows a characteristic spacing. This is the first time that nonuniform force plateaus are reported for polymer molecules. A simple model for the polym...
影响因子：
56.9
作者：
SMITH, SB;FINZI, L;BUSTAMANTE, C
通讯作者：
BUSTAMANTE, C