Dispersing nano- and micro-sized portlandite particulates via electrosteric exclusion at short screening lengths

Timmons, Jason; Mehdipour, Iman; Gao, Shang; Atahan, Hakan; Neithalath, Narayanan; Bauchy, Mathieu; Garboczi, Edward; Srivastava, Samanvaya; Sant, Gaurav

doi:10.1039/d0sm00045k

Title: Dispersing nano- and micro-sized portlandite particulates via electrosteric exclusion at short screening lengths

Journal Article · Mon Mar 16 00:00:00 EDT 2020 · Soft Matter

DOI:https://doi.org/10.1039/d0sm00045k· OSTI ID:1799900

Timmons, Jason ^[1];

^[1]; Gao, Shang ^[2]; Atahan, Hakan ^[3]; Neithalath, Narayanan ^[4]; Bauchy, Mathieu ^[5]; Garboczi, Edward ^[6];

^[7]; Sant, Gaurav ^[8]

Univ. of California, Los Angeles, CA (United States). Laboratory for the Chemistry of Construction Materials (LC2)
Department of Chemical and Biomolecular Engineering;University of California;Los Angeles;USA
Univ. of California, Los Angeles, CA (United States). Laboratory for the Chemistry of Construction Materials (LC2); Istanbul Technical Univ. (Turkey)
Arizona State Univ., Tempe, AZ (United States)
Univ. of California, Los Angeles, CA (United States). Laboratory for the Physics of Amorphous and Inorganic Solids (PARISlab)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States). Laboratory for the Chemistry of Construction Materials (LC2) and California Nanosystems Institute (CNSI)

In spite of their high surface charge (zeta potential ζ = +34 mV), aqueous suspensions of portlandite (calcium hydroxide: Ca(OH)₂) exhibit a strong tendency to aggregate, and thereby present unstable suspensions. While a variety of commercial dispersants seek to modify the suspension stability and rheology (e.g., yield stress, viscosity), it remains unclear how the performance of electrostatically and/or electrosterically based additives is affected in aqueous environments having either a high ionic strength and/or a pH close to the particle's isoelectric point (IEP). We show that the high native ionic strength (pH ≈ 12.6, IEP: pH ≈ 13) of saturated portlandite suspensions strongly screens electrostatic forces (Debye length: κ^-1 = 1.2 nm). As a result, coulombic repulsion alone is insufficient to mitigate particle aggregation and affect rheology. However, a longer-range geometrical particle–particle exclusion that arises from electrosteric hindrance caused by the introduction of comb polyelectrolyte dispersants is very effective at altering the rheological properties and fractal structuring of suspensions. As a result, comb-like dispersants that stretch into the solvent reduce the suspension's yield stress by 5× at similar levels of adsorption as compared to linear dispersants, thus enhancing the critical solid loading (i.e., at which jamming occurs) by 1.4×. Significantly, the behavior of diverse dispersants is found to be inherently related to the thickness of the adsorbed polymer layer on particle surfaces. These outcomes inform the design of dispersants for concentrated suspensions that present strong charge screening behavior.

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Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)

Grant/Contract Number:: FE0029825; FE0031718

OSTI ID:: 1799900

Alternate ID(s):: OSTI ID: 1605619

Journal Information:: Soft Matter, Vol. 16, Issue 14; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Dispersing nano- and micro-sized portlandite particulates via electrosteric exclusion at short screening lengths

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