在交变电场中低电导率纳米颗粒上吸附的聚电解质的构象结构

Q3 Engineering
M.G. M.G. Kucherenko
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引用次数: 0

摘要

本文提出了吸附在电导率相对较低的纳米球体(未掺杂半导体)上的聚电解质高斯链单元的准平衡构象结构模型的解析形式,该模型在明显低于纳米颗粒材料等离子体频率的外部谐波变化的准静态电场中极化。讨论了超出准静态近似范围的模型变体,即考虑了延迟的影响,其表现形式在足够扩展的纳米结构的情况下将是明显的。本文用分子动力学方法研究了球形锗纳米颗粒表面中性多肽在静电或交变电场作用下的电诱导构象变化。在静电场中,在聚两性聚合物中带电单元之间距离较小的情况下,形成了大量的大链环,并沿着纳米粒子的极化轴方向拉长。如果多肽的氨基酸残基之间的距离超过纳米粒子的直径,则带电单元主要集中在极化锗纳米粒子的亚极性区。在交变电场作用下,纳米颗粒的赤道区形成带状多极性边缘,随着极化交变电场振幅的增大,纳米颗粒表面的大链链被解吸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CONFORMATIONAL STRUCTURE OF AN ADSORBED POLYELECTROLYTE ON A NANOPARTICLE WITH LOW CONDUCTIVITY IN AN ALTERNATING ELECTRIC FIELD
An analytical form of the model of the quasi-equilibrium conformational structure of the units of the Gaussian chain of a polyelectrolyte adsorbed on a nanospheroid witha relatively low electrical conductivity (undoped semiconductor) polarized in an external harmonically varying quasi-static electric field with a frequency significantly lower than the plasma frequency of the nanoparticle material is proposed. Variants ofthe model are discussed that go beyond the scope of the quasi-static approximation, i.e., take into account the effects of delay, the manifestation of which will be noticeable in the case of sufficiently extended nanostructures. Electrically induced conformational changes of generally neutral polyampholytic polypeptides on the surface of a spherical germanium nanoparticle in a static or alternating external electric field have been studied by molecular dynamics. In a static electric field, in the case of asmall distance between the charged units in the polyampholyte, a large number of macrochain loops were formed, elongated in the direction of the polarization axis of the nanoparticle. If the distance between the oppositely charged amino acid residues of the polypeptide exceeded the diameter of the nanoparticle, the charged units were mainly localized in the oppositely charged subpolar regions of the polarized germanium nanoparticle. In an alternating electric field, a girdle polyampholyte edge was formed in the equatorial region of the nanoparticle, the macrochain links of which were desorbed from the surface with an increase in the amplitude of the polarizing alternating electric field.
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来源期刊
CiteScore
1.10
自引率
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发文量
15
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