Force-induced globule-coil transition in single polystyrene chains in water
Force-induced globule-coil transition in single polystyrene chains in water
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DOI：
10.1021/ja068652w
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发表时间：
2007-08-22
影响因子：
15
通讯作者：
Walker, Gilbert C.
中科院分区：
文献类型：
--
作者：
Gunari, Nikhil;Balazs, Anna C.;Walker, Gilbert C.
使用基于原子力显微镜的力谱研究了水中单一均聚物（聚苯乙烯）链中力诱导的球体到线圈的转变。构象变化显示出类似一级转变的特征。在 6 M 盐酸胍（离液盐）存在下，在水中观察到的特征平台力消失，而在 1 M NaCl（离液盐）存在下，平台力增强。这些观察表明，观察到的特征平台力可能受疏水相互作用的控制。
Force induced globule-to-coil transitions have been studied in single homopolymer (polystyrene) chains in water using atomic force microscopy-based force spectroscopy. The conformational change showed signatures of a first-order-like transition. The characteristic plateau force observed in water disappears in the presence of 6 M guanidine hydrochloride (chaotropic salt), while in the presence of 1 M NaCl (kosmotropic salt) the plateau force is enhanced. These observations indicate that the characteristic plateau force observed may be governed by hydrophobic interactions.