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Title: Effect of hydration on morphology of thin phosphonate block copolymer electrolyte membranes studied by electron tomography

Abstract

The morphological changes of phosphonate polypeptoid electrolyte membranes, poly-N-(2-ethyl)hexylglycine-block-poly-N-phosphonomethylglycine (pNehm-b-pNpmn), in hydrated and dry states were characterized by cryogenic transmission electron microscopy (cryo-TEM) and cryogenic electron tomography (cryo-ET). The analysis of 3D tomograms revealed that the pNeh9-b-pNpm9 thin films absorbed a large amount of water, resulting in the formation of membranes that were nearly flat and giant multicompartment vesicles dispersed in the water phase. A simple lamellar phase appeared when the films were dried. In contrast, pNeh18-b-pNpm18 thin films absorbed little water and formed small highly curved unilamellar and multilamellar vesicles. Water was located mainly outside the closely-packed vesicles. When water was removed by drying, the walls of adjacent vesicles collapsed to form honeycomb-like capsules. Here, the changes in domain size reflected changes in chain conformations. The pNpm9 blocks were saturated by water and fully extended, while pNpm18 blocks were neither saturated by water nor fully extended. In addition, the thicknesses of hydrophobic blocks in the hydrated films of both pNeh9-b-pNpm9 and pNeh18-b-pNpm18 were smaller than those in the dry films, reflecting an increase of the average distance between the neighboring junctions of polypeptoid molecules.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Qingdao Univ. of Science and Technology (China)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1826550
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Polymer Engineering and Science
Additional Journal Information:
Journal Volume: 61; Journal Issue: 4; Journal ID: ISSN 0032-3888
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; cryogenic; electron tomography; low-dose; polymer electrolyte membrane; polypeptoid; transmission electron microscopy

Citation Formats

Jiang, Xi, Sun, Jing, Zuckermann, Ronald N., and Balsara, Nitash P. Effect of hydration on morphology of thin phosphonate block copolymer electrolyte membranes studied by electron tomography. United States: N. p., 2021. Web. doi:10.1002/pen.25646.
Jiang, Xi, Sun, Jing, Zuckermann, Ronald N., & Balsara, Nitash P. Effect of hydration on morphology of thin phosphonate block copolymer electrolyte membranes studied by electron tomography. United States. https://doi.org/10.1002/pen.25646
Jiang, Xi, Sun, Jing, Zuckermann, Ronald N., and Balsara, Nitash P. Wed . "Effect of hydration on morphology of thin phosphonate block copolymer electrolyte membranes studied by electron tomography". United States. https://doi.org/10.1002/pen.25646. https://www.osti.gov/servlets/purl/1826550.
@article{osti_1826550,
title = {Effect of hydration on morphology of thin phosphonate block copolymer electrolyte membranes studied by electron tomography},
author = {Jiang, Xi and Sun, Jing and Zuckermann, Ronald N. and Balsara, Nitash P.},
abstractNote = {The morphological changes of phosphonate polypeptoid electrolyte membranes, poly-N-(2-ethyl)hexylglycine-block-poly-N-phosphonomethylglycine (pNehm-b-pNpmn), in hydrated and dry states were characterized by cryogenic transmission electron microscopy (cryo-TEM) and cryogenic electron tomography (cryo-ET). The analysis of 3D tomograms revealed that the pNeh9-b-pNpm9 thin films absorbed a large amount of water, resulting in the formation of membranes that were nearly flat and giant multicompartment vesicles dispersed in the water phase. A simple lamellar phase appeared when the films were dried. In contrast, pNeh18-b-pNpm18 thin films absorbed little water and formed small highly curved unilamellar and multilamellar vesicles. Water was located mainly outside the closely-packed vesicles. When water was removed by drying, the walls of adjacent vesicles collapsed to form honeycomb-like capsules. Here, the changes in domain size reflected changes in chain conformations. The pNpm9 blocks were saturated by water and fully extended, while pNpm18 blocks were neither saturated by water nor fully extended. In addition, the thicknesses of hydrophobic blocks in the hydrated films of both pNeh9-b-pNpm9 and pNeh18-b-pNpm18 were smaller than those in the dry films, reflecting an increase of the average distance between the neighboring junctions of polypeptoid molecules.},
doi = {10.1002/pen.25646},
journal = {Polymer Engineering and Science},
number = 4,
volume = 61,
place = {United States},
year = {Wed Jan 27 00:00:00 EST 2021},
month = {Wed Jan 27 00:00:00 EST 2021}
}

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