Viscosity and stability of ultra-high internal phase CO2-in-water foams stabilized with surfactants and nanoparticles with or without polyelectrolytes

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:461

Article

Xue, Zheng¹  Worthen, Andrew¹  Qajar, Ali²  Robert, Isaiah¹  Bryant, Steven L.²  Huh, Chun²  Prodanovic, Masa²  Johnston, Keith P.¹ 

[1] Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA

[2] Univ Texas Austin, Dept Petr & Geosyst Engn, Austin, TX 78712 USA

关键词: CO2-in-water foam;    High internal phase foam;    Nanoparticle-stabilized foam;    Foam stability;    Viscosity;   

DOI  :  10.1016/j.jcis.2015.08.031

来源: Elsevier

【 摘 要 】

To date, relatively few examples of ultra-high internal phase supercritical CO2-in-water foams (also referred to as macroemulsions) have been observed, despite interest in applications including waterless hydraulic fracturing in energy production. The viscosities and stabilities of foams up to 0.98 CO2 volume fraction were investigated in terms of foam bubble size, interfacial tension, and bulk and surface viscosity. The foams were stabilized with laurylamidopropyl betaine (LAPB) surfactant and silica nanoparticles (NPs), with and without partially hydrolyzed polyacrylamide (HPAM). For foams stabilized with mixture of LAPS and NPs, fine similar to 70 mu m bubbles and high viscosities on the order of 100 cP at >0.90 internal phase fraction were stabilized for hours to days. The surfactant reduces interfacial tension, and thus facilitates bubble generation and decreases the capillary pressure to reduce the drainage rate of the lamella. The LAPB, which is in the cationic protonated form, also attracts anionic NPs (and anionic HPAM in systems containing polymer) to the interface. The adsorbed NPs at the interface are shown to slow down Ostwald ripening (with or without polymer added) and increase foam stability. In systems with added HPAM, the increase in the bulk and surface viscosity of the aqueous phase further decreases the lamella drainage rate and inhibits coalescence of foams. Thus, the added polymer increases the foam viscosity by threefold. Scaling law analysis shows the viscosity of 0.90 volume fraction foams is inversely proportional to the bubble size. (C) 2015 Elsevier Inc. All rights reserved.

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