Measurement of the Zeta Potential of Gas Bubbles in Aqueous Solutions by Microelectrophoresis Method

Yang, Chun; Dąbroś, Tadeusz; Li, Dongqing; Czarnecki, Jan; Masliyah, Jacob H.

doi:10.1006/jcis.2001.7842

Cited by 278 publications

(225 citation statements)

References 31 publications

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“…At pH 7, the zeta potential of a micro-bubble in water is approximately À25 to À60 mV (Oliveira and Rubio, 2011;Yang et al 2001), though the value can be altered depending on background ionic conditions (Oliveira and Rubio, 2011;Yang et al 2001). Bubbles modified with CTAB and polyDADMAC resulted in positive bubbles with little variation in the magnitude of their zeta potentials at pH 7.…”

Section: Bubble Coating With Hydrophobically Functionalised Polymersmentioning

confidence: 99%

“…Similarly, in an investigation of polymers with low polydispersity at an airewater interface, Matsuoka et al (2004) also found that charged polymers exhibited 'non-surface activity' despite the presence of hydrophobic groups. Polymer accumulation at the air-liquid interface is theorised to occur as hydrogen bonding with OH À or H þ groups (Yang et al 2001), which translates to air-liquid surface adsorption without surface penetration. This has been confirmed with X-ray reflectance, demonstrating that both hydrophilichydrophobic random copolymers and hydrophilic homopolymers did adsorb at the air-liquid interface in solution, despite demonstrating no change in surface tension over a large concentration range (Matsuoka et al 2012).…”

Section: Bubble Coating With Hydrophobically Functionalised Polymersmentioning

confidence: 99%

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Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

et al. 2014

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Cyanobacteria Flotation PosiDAFWater soluble polymers a b s t r a c t Dissolved air flotation (DAF), an effective treatment method for clarifying algae/cyanobacteria-laden water, is highly dependent on coagulation-flocculation. Treatment of algae can be problematic due to unpredictable coagulant demand during blooms. To eliminate the need for coagulation-flocculation, the use of commercial polymers or surfactants to alter bubble charge in DAF has shown potential, termed the PosiDAF process. When using surfactants, poor removal was obtained but good bubble adherence was observed.Conversely, when using polymers, effective cell removal was obtained, attributed to polymer bridging, but polymers did not adhere well to the bubble surface, resulting in a cationic clarified effluent that was indicative of high polymer concentrations. In order to combine the attributes of both polymers (bridging ability) and surfactants (hydrophobicity), in this study, a commercially-available cationic polymer, poly(dimethylaminoethyl methacrylate) (polyDMAEMA), was functionalised with hydrophobic pendant groups of various carbon chain lengths to improve adherence of polymer to a bubble surface. Its performance in PosiDAF was contrasted against commercially-available poly(diallyl dimethyl ammonium chloride) (polyDADMAC). All synthesised polymers used for bubble surface modification were found to produce positively charged bubbles. When applying these cationic micro-bubbles in PosiDAF, in the absence of coagulation-flocculation, cell removals in excess of 90% were obtained, reaching a maximum of 99% cell removal and thus demonstrating process viability. Of the synthesised polymers, the polymer * Corresponding author.E-mail address: r.henderson@unsw.edu.au (R.K. Henderson). 1 Current address: School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.Available online at www.sciencedirect.com ScienceDirect journal h ome page: www.elsevier.com/loca te/watres w a t e r r e s e a r c h 6 1 ( 2 0 1 4 ) 2 5 3 e2 6 2 http://dx

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Section: Bubble Coating With Hydrophobically Functionalised Polymersmentioning

confidence: 99%

Section: Bubble Coating With Hydrophobically Functionalised Polymersmentioning

confidence: 99%

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

et al. 2014

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“…However, both bitumen and air bubbles are negatively charged in an aqueous media under natural conditions (Takamura and Chow, 1985;Chow and Takamura, 1988;Takamura and Isaacs, 1989;Yang et al, 2001). The efficiency of their attachment would therefore depend on the hydrodynamic and water chemistry environment of the system.…”

Section: Bitumen and Bubble Sizementioning

confidence: 99%

Understanding Water‐Based Bitumen Extraction from Athabasca Oil Sands

et al. 2004

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The current state of knowledge on the fundamentals of bitumen recovery from Athabasca oil sands using water‐based extraction methods is reviewed. Instead of investigating bitumen extraction as a black box, the bitumen extraction process has been discussed and analyzed as individual steps: Oil sand lump size reduction, bitumen liberation, aeration, flotation and interactions among the different components that make up an oil sand slurry. With the development and adoption of advanced analytical instrumentations, our understanding of bitumen extraction at each individual step has been extended from the macroscopic scale down to the molecular level. How to improve bitumen recovery and bitumen froth quality from poor processing ores is still a future challenge in oil sands processing.

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“…Bearing the same type of charges as native yeast cells, air-water interface is intrinsically negative. 34,35 The efficacy of micro bubble templates (air) for the generation of yeastosomes has been demonstrated elsewhere, where spontaneous formation of PAH-coated yeast cells stabilized bubbles after long, exhaustive vortices were reported. 1,2 Stabilization of air or nitrogen gas bubbles generated via microfluidics with cells appeared challenging due to the long timeframe (relative to bubble traveling time inside the microchannels) for the surfaces to be intensively covered with yeasts, an essential state to avoid bubble coalescence.…”

Section: -5mentioning

confidence: 92%

Uniform yeast cell assembly via microfluidics

Chang

Marquez

et al. 2012

Biomicrofluidics

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This paper reports the use of microfluidic approaches for the fabrication of yeastosomes (yeast-celloidosomes) based on self-assembly of yeast cells onto liquid-solid or liquid-gas interfaces. Precise control over fluidic flows in droplet- and bubble-forming microfluidic devices allows production of monodispersed, size-selected templates. The general strategy to organize and assemble living cells is to tune electrostatic attractions between the template (gel or gas core) and the cells via surface charging. Layer-by-Layer (LbL) polyelectrolyte deposition was employed to invert or enhance charges of solid surfaces. We demonstrated the ability to produce high-quality, monolayer-shelled yeastosome structures under proper conditions when sufficient electrostatic driving forces are present. The combination of microfluidic fabrication with cell self-assembly enables a versatile platform for designing synthetic hierarchy bio-structures.

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Measurement of the Zeta Potential of Gas Bubbles in Aqueous Solutions by Microelectrophoresis Method

Cited by 278 publications

References 31 publications

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

Understanding Water‐Based Bitumen Extraction from Athabasca Oil Sands

Uniform yeast cell assembly via microfluidics

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