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Rheological behavior of clay-nanoparticle hybrid-added bentonite suspensions: Specific role of hybrid additives on the gelation of clay-based fluids

Jung, Y and Son, YH and Lee, JK and Phuoc, TX and Soong, Y and Chyu, MK (2011) Rheological behavior of clay-nanoparticle hybrid-added bentonite suspensions: Specific role of hybrid additives on the gelation of clay-based fluids. ACS Applied Materials and Interfaces, 3 (9). 3515 - 3522. ISSN 1944-8244

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Two different types of clay nanoparticle hybrid, iron oxide nanoparticle clay hybrid (ICH) and Al2O3-SiO2 nanoparticle clay hybrid (ASCH), were synthesized and their effects on the rheological properties of aqueous bentonite fluids in steady state and dynamic state were explored. When ICH particles were added, bentonite particles in the fluid cross-link to form relatively well-oriented porous structure. This is attributed to the development of positively charged edge surfaces in ICH that leads to strengthening of the gel structure of the bentonite susensions. The role of ASCH particles on the interparticle association of the bentonite fluids is different from that of ICH and sensitive to pH. As pH of ASCH-added bentonite suspensions increased, the viscosity, yield stress, storage modulus, and flow stress decreased. In contrast, at low pH, the clay suspensions containing ASCH additives were coagulated and their rheological properties become close to those of ICH added bentonite fluids. A correlation between the net surface charge of the hybrid additives and the rheological properties of the fluids indicates that the embedded nanoparticles within the interlayer space control the variable charge of the edge surfaces of the platelets and determine the particles association behavior of the clay fluids. © 2011 American Chemical Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Jung, Y
Son, YH
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Phuoc, TX
Soong, Y
Chyu, MKmkchyu@pitt.eduMKCHYU0000-0002-6746-1499
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 28 September 2011
Date Type: Publication
Journal or Publication Title: ACS Applied Materials and Interfaces
Volume: 3
Number: 9
Page Range: 3515 - 3522
DOI or Unique Handle: 10.1021/am200742b
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1944-8244
MeSH Headings: Aluminum Silicates--chemistry; Bentonite--chemistry; Ferric Compounds--chemistry; Hydrogen-Ion Concentration; Metal Nanoparticles--chemistry; Rheology; Silicon Dioxide--chemistry
PubMed ID: 21888313
Date Deposited: 15 Oct 2014 20:38
Last Modified: 22 Jun 2021 13:56


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