PERSISTENCE LENGTH OF POLYELECTROLYTE CHAINS
PERSISTENCE LENGTH OF POLYELECTROLYTE CHAINS
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DOI：
10.1209/0295-5075/24/5/003
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发表时间：
1993-11-10
期刊：
影响因子：
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通讯作者：
JOANNY, JF
中科院分区：
文献类型：
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作者：
BARRAT, JL;JOANNY, JF
回顾了由Odijk，Skolnick和Fixman(OSF)引起的聚电解质链静电持续长度的经典理论。与原来的理论不同，我们的方法考虑了链构型的涨落的影响。结果，我们发现，尽管OSF理论对于本质上是刚性的聚电解质是正确的，但对于柔性链却是错误的。建立了区分柔性链和刚性链的定量准则。对于柔性链，我们用变分理论计算了静电驻留长度，发现它与德拜-休克尔屏蔽长度成正比，与许多实验和模拟结果一致。
The classical theory of the electrostatic persistence length of polyelectrolyte chains due to Odijk, Skolnick and Fixman (OSF) is revisited. In contrast to the original theory, our approach takes into account the effect of fluctuations in the chain configuration. As a result, we find that the OSF theory, although correct for intrinsically rigid polyelectrolytes, breaks down for flexible chains. A quantitative criterion is established to distinguish between flexible and rigid chains. For flexible chains, we use a variational theory to compute the electrostatic persistence length, which is found to be proportional to the Debye-Huckel screening length, in agreement with many experimental and simulation results.