Effect of Alkali Metal Counterion on Hierarchical Self-assembly of C<sub>3</sub>-Symmetric Oligoamide Supramolecules

Wei-heng Huang; Sheng-hui Wei; Ning-dong Huang; Liang-bin Li; Dao-liang Wang

doi:10.11777/j.issn1000-3304.2018.18273

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Effect of Alkali Metal Counterion on Hierarchical Self-assembly of C₃-Symmetric Oligoamide Supramolecules

Research Article | 更新时间：2021-01-26

- Effect of Alkali Metal Counterion on Hierarchical Self-assembly of C₃-Symmetric Oligoamide Supramolecules
- Acta Polymerica Sinica Vol. 50, Issue 7, Pages: 702-709(2019)
- 作者机构：
  
  1.国家同步辐射实验室中国科学技术大学　合肥 230029
  2.清华大学合肥公共安全研究院　合肥 230088
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18273
  CLC：
- Published：2019-7，
  
  Published Online：26 February 2019，
  
  Received：20 December 2018，
  
  Revised：22 January 2019，
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Wei-heng Huang, Sheng-hui Wei, Ning-dong Huang, Liang-bin Li, Dao-liang Wang. Effect of Alkali Metal Counterion on Hierarchical Self-assembly of C₃-Symmetric Oligoamide Supramolecules. [J]. Acta Polymerica Sinica 50(7):702-709(2019)
DOI：

Wei-heng Huang, Sheng-hui Wei, Ning-dong Huang, Liang-bin Li, Dao-liang Wang. Effect of Alkali Metal Counterion on Hierarchical Self-assembly of C₃-Symmetric Oligoamide Supramolecules. [J]. Acta Polymerica Sinica 50(7):702-709(2019) DOI： 10.11777/j.issn1000-3304.2018.18273.

摘要

选用具有不同碱金属反离子(Na

、K

、Cs

)的C

对称低聚酰胺超分子为研究体系，结合同步辐射X射线小角散射和透射电子显微镜技术，研究碱金属反离子对C

对称低聚酰胺超分子多级自组装的影响. 研究表明具有不同碱金属反离子的C

对称低聚酰胺超分子都能在水溶液中自组装成管状结构，这些管状结构在反离子为Na

的溶液中会进一步有序排列成中心正交相，在反离子为K

和Cs

的溶液中排列成六方相. 碱金属反离子通过其与C

对称低聚酰胺分子末端羧酸根基团吸附程度的不同来改变管状自组装结构的表面带电量，从而调节甚至改变超分子多级自组装结构，为进一步深入理解离子效应并利用离子效应调控自组装有序结构提供了思路.

Abstract

The effect of alkali metal counterion (Na

) on hierarchical self-assembly of C

-symmetric oligoamide supramolecules was studied by Synchrotron radiation X-ray small angle scattering and transmission electron microscope. The C

-symmetric molecules with three-armed aromatic oligoamide and different alkali metal counterions are denoted as P

(COONa)

(COOK)

and P

(COOCs)

. The experimental results show that the C

-symmetric molecules can self-assemble into tubular structures

which will further aggregate in aqueous solution to form a centered rectangular phase in P

(COONa)

or a hexagonal phase in P

(COOK)

and P

(COOCs)

. The centered rectangular phase formed by P

(COONa)

has a higher degree of order and the adjacent tubular structures become closer compared with the hexagonal phase formed by P

(COOK)

and P

(COOCs)

. Though the hexagonal phase formed by P

(COOCs)

gives a higher degree of order than that formed by P

(COOK)

they have the similar symmetry and comparable distances between adjacent tubular structures. Therefore

by changing the counterion from Na

to K

or Cs

a phase transition from a centered rectangular phase to hexagonal phase can be achieved. In addition

the electron-density maps show that the fine structure of tubular aggregates will change slightly when the counterion changes from K

to Cs

which manifests the increase of the diameter of water channel in the tubular structures. The phase transition mentioned above may result from the different surface charge of tubular structures

as the adsorption capacity of counterions for the terminal carboxylate group in the C

-symmetric oligoamide will decline when the conterion changes from Na

to Cs

due to the increasing ionic radius. This kind of hierarchical self-assembly of ordered superstructure constructed by C

-symmetric oligoamide not only has the advantages of easy modification and structural stability

but also can be manipulated by simply changing the counterion

and thus has great application potential in drug delivery

tissue repair

etc

关键词

离子效应碱金属反离子C3对称低聚酰胺超分子自组装X射线小角散射

Keywords

Ionic effectAlkali metal counterionC3-symmetric oligoamideSupramolecular self-assemblyX-ray small angle scattering

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State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Science

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⁰

Effect of Alkali Metal Counterion on Hierarchical Self-assembly of C3-Symmetric Oligoamide Supramolecules

DOI：10.11777/j.issn1000-3304.2018.18273

摘要

Abstract

关键词

Keywords

references

Effect of Alkali Metal Counterion on Hierarchical Self-assembly of C₃-Symmetric Oligoamide Supramolecules