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Title: Ion-Specific Interfacial Crystallization of Polymer-Grafted Nanoparticles

Abstract

In this study, ion-specific effects on the assembly and crystallization of polyethylene-glycol-grafted Au nanoparticles (PEG-AuNPs) at the vapor–liquid interface are examined by surface sensitive synchrotron X-ray scattering methods. We show that monovalent salts, such as KCl and NaCl, that do not advance phase separation of pure PEG at room temperature induce two-dimensional (2D) self-assembly and crystallization of PEG-AuNPs with some distinctions. Whereas for KCl the 2D hexagonal coherence length of the PEG-AuNP superlattices is remarkably large compared to other salts (over micron-sized crystalline grains), NaCl induces coexistence of two hexagonal structures. Using various salts, we find that the value of the lattice constant is correlated to the ionic hydration entropy consistent with the Hofmeister series.

Authors:
 [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1379197
Report Number(s):
IS-J-9419
Journal ID: ISSN 1932-7447
Grant/Contract Number:
AC02-07CH11358
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 121; Journal Issue: 28; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, Honghu, Wang, Wenjie, Mallapragada, Surya, Travesset, Alex, and Vaknin, David. Ion-Specific Interfacial Crystallization of Polymer-Grafted Nanoparticles. United States: N. p., 2017. Web. doi:10.1021/acs.jpcc.7b02549.
Zhang, Honghu, Wang, Wenjie, Mallapragada, Surya, Travesset, Alex, & Vaknin, David. Ion-Specific Interfacial Crystallization of Polymer-Grafted Nanoparticles. United States. doi:10.1021/acs.jpcc.7b02549.
Zhang, Honghu, Wang, Wenjie, Mallapragada, Surya, Travesset, Alex, and Vaknin, David. Tue . "Ion-Specific Interfacial Crystallization of Polymer-Grafted Nanoparticles". United States. doi:10.1021/acs.jpcc.7b02549.
@article{osti_1379197,
title = {Ion-Specific Interfacial Crystallization of Polymer-Grafted Nanoparticles},
author = {Zhang, Honghu and Wang, Wenjie and Mallapragada, Surya and Travesset, Alex and Vaknin, David},
abstractNote = {In this study, ion-specific effects on the assembly and crystallization of polyethylene-glycol-grafted Au nanoparticles (PEG-AuNPs) at the vapor–liquid interface are examined by surface sensitive synchrotron X-ray scattering methods. We show that monovalent salts, such as KCl and NaCl, that do not advance phase separation of pure PEG at room temperature induce two-dimensional (2D) self-assembly and crystallization of PEG-AuNPs with some distinctions. Whereas for KCl the 2D hexagonal coherence length of the PEG-AuNP superlattices is remarkably large compared to other salts (over micron-sized crystalline grains), NaCl induces coexistence of two hexagonal structures. Using various salts, we find that the value of the lattice constant is correlated to the ionic hydration entropy consistent with the Hofmeister series.},
doi = {10.1021/acs.jpcc.7b02549},
journal = {Journal of Physical Chemistry. C},
number = 28,
volume = 121,
place = {United States},
year = {Tue Jun 27 00:00:00 EDT 2017},
month = {Tue Jun 27 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 27, 2018
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