Time-Ionic Strength Superposition: A Unified Description of Chain Relaxation Dynamics in Polyelectrolyte Complexes.
Time-Ionic Strength Superposition: A Unified Description of Chain Relaxation Dynamics in Polyelectrolyte Complexes.
复制标题
时间离子强度叠加：聚电解质复合物中链松弛动力学的统一描述。
DOI：
10.1021/acsmacrolett.0c00252
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发表时间：
2020
影响因子：
7.015
通讯作者：
Samanvaya Srivastava
中科院分区：
文献类型：
--
作者：
Vaqar M. S. Syed;Samanvaya Srivastava
盐的加入加速了聚电解质配合物（PECs）的链弛豫动力学，并建立了时间-盐叠加（TSS）方法来描述PECs的线性粘弹性响应。然而，TSS是在固定的初始聚电解质浓度下进行的，不同的初始聚电解质浓度会导致不同的TSS主曲线。在这项贡献中，我们表明，考虑到伴随相反电荷的聚电解质链的小离子（指定为伴随的反离子），可以将这些不同的TSS主曲线同化为单一的通用主曲线。我们将这种方法命名为时间-离子强度叠加（TISS），可以根据溶液离子强度对PEC粘弹性响应进行统一描述，该方法考虑了伴随的反离子和添加的离子，并强调了PEC与半稀聚合物溶液之间的动力学相似性。然而，在带相反电荷的链之间的粘性静电关联在PECs中贡献了额外的弛豫模式。我们证明了这些附加弛豫模式的时间尺度可以用一个修正的粘性劳斯模型来定量描述，该模型考虑了溶液离子强度对静电筛选和链摩擦的影响。
Addition of salt speeds up chain relaxation dynamics in polyelectrolyte complexes (PECs), and time-salt superposition (TSS) approaches to describe the linear viscoelastic response of PECs are well-established. However, TSS is carried out at fixed initial polyelectrolyte concentrations, and varying the initial polyelectrolyte concentration results in distinct TSS master curves. In this contribution, we show that accounting for the small ions that accompany the oppositely charged polyelectrolyte chains (designated as accompanying counterions) enables assimilation of these distinct TSS master curves into a single universal master curve. This approach, that we christen as time-ionic strength superposition (TISS), enables a unified description of the PEC viscoelastic response in terms of the solution ionic strength, that accounts for both the accompanying counterions and the added ions, and underlines the dynamic similarities between PECs and semidilute polymer solutions. The sticky electrostatic associations among the oppositely charged chains, however, contribute additional relaxation modes in the PECs. We demonstrate that the time scales of these additional relaxation modes are described quantitatively by a modified sticky Rouse model that accounts for the influence of solution ionic strength on electrostatic screening and chain friction.
影响因子：
5.5
作者：
Schlenoff, Joseph B.;Yang, Mo;Wang, Qifeng
通讯作者：
Wang, Qifeng
影响因子：
4.4
作者：
Ou, ZY;Muthukumar, M
通讯作者：
Muthukumar, M
影响因子：
41.2
作者：
Zhao Q;Lee DW;Ahn BK;Seo S;Kaufman Y;Israelachvili JN;Waite JH
通讯作者：
Waite JH