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Title: Direct visualization of the hydration layer on alumina nanoparticles with the fluid cell STEM in situ

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep09830· OSTI ID:1225384
 [1];  [2];  [1];  [3];  [1]
  1. Ames Lab., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Rheological behavior of aqueous suspensions containing nanometer-sized powders is of relevance to many branches of industry. Unusually high viscosities observed for suspensions of nanoparticles compared to those of micron size powders cannot be explained by current viscosity models. Formation of so-called hydration layer on alumina nanoparticles in water was hypothesized, but never observed experimentally. We report here on the direct visualization of aqueous suspensions of alumina with the fluid cell in situ. We observe the hydration layer formed over the particle aggregates and show that such hydrated aggregates constitute new particle assemblies and affect the flow behavior of the suspensions. We discuss how these hydrated nanoclusters alter the effective solid content and the viscosity of nanostructured suspensions. As a result, our findings elucidate the source of high viscosity observed for nanoparticle suspensions and are of direct relevance to many industrial sectors including materials, food, cosmetics, pharmaceutical among others employing colloidal slurries with nanometer-scale particles.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1225384
Report Number(s):
IS-J-8517; srep09830
Journal Information:
Scientific Reports, Vol. 5, Issue 2; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (5)

Statistical Modeling and Surface Texture Study of Polished Silicon Wafer Si (100) using Chemically Assisted Double Disk Magnetic Abrasive Finishing journal August 2018
Synthesis of core–shell AlOOH hollow nanospheres by reacting Al nanoparticles with water journal April 2016
High flow rate nanofluidics for in-liquid electron microscopy and diffraction journal July 2019
Mussel‐Glue Inspired Adhesives: A Study on the Relevance of l ‐Dopa and the Function of the Sequence at Nanomaterial‐Peptide Interfaces journal April 2019
Organic-Inorganic Solid-State Hybridization with High-Strength and Anti-Hydrolysis Interface journal January 2019

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