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Title: Structure and Dynamics of Bimodal Colloidal Dispersions in a Low-Molecular-Weight Polymer Solution

Journal Article · · Langmuir
ORCiD logo [1];  [1];  [1];  [2];  [3]
  1. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  2. National Tsing Hua Univ., Taiwan (Republic of China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

We present an experimental study of the structural and dynamical properties of bimodal, micrometersized colloidal dispersions (size ratio ≈ 2) in an aqueous solution of low-molecular weight polymer (polyethylene glycol 2000) using synchrotron ultra-small angle X-ray scattering (USAXS) and USAXSbased X-ray photon correlation spectroscopy. We fixed the volume fraction of the large particles at 5 % and systematically increased the volume fraction of the small particles from 0 % to 5 % to evaluate its effect on the structure and dynamics. The bimodal dispersions were homogenous through the investigated parameter space. We found that the partial structure factors can be satisfactorily retrieved for the bimodal colloidal dispersions using a Percus-Yevick hard sphere potential when the particle size distributions of the particles were taken into account. We also found that the partial structure factor between the large particles does not exhibit significant variation with increasing volume fraction of small particles, whereas the isothermal compressibility of the binary mixture was found to decrease with increasing volume fraction of small particles. The dynamics of single-component large particle dispersion obey the principles of de Gennes narrowing, where the wave vector dependence of the interparticle diffusion coefficient is inversely proportional to the interparticle structure factor. The dynamics of the bimodal dispersions demonstrate strong dependence on the fraction of small particles. As a result, we also made a comparison between the experimental effective dynamic viscosity of the bimodal dispersion with theoretical predictions, which suggest that the complex mutual interactions between large and small particles have a strong effect on the dynamic behaviors of bimodal dispersions.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of Standards and Technology (NIST)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1372073
Journal Information:
Langmuir, Vol. 33, Issue 11; ISSN 0743-7463
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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High-efficiency coherence-preserving harmonic rejection with crystal optics journal August 2018
Development of combined microstructure and structure characterization facility for in situ and operando studies at the Advanced Photon Source journal June 2018
Transformation of engineered nanomaterials through the prism of silver sulfidation journal January 2019
High-efficiency coherence-preserving harmonic rejection with crystal optics text January 2018
Synchrotron Scattering Methods for Nanomaterials and Soft Matter Research journal February 2020

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