The adsorption of small particles onto larger particles of opposite charge Direct electron microscope studies

Harley, Stephen J.; Thompson, D. W.; Vincent, Brian

doi:10.1016/0166-6622(92)80048-7

Cited by 104 publications

(88 citation statements)

References 19 publications

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“…pH 3.0) dispersed in pure water or upon addition of various hydroxypropyl celluloses (HPCs) [17,18]. Stable dispersions for both individual particles under the condition that they had opposite [20] surface charge only occurred in the narrow pH window between pH 5 and 6. Stable raspberry-like heterocoagulates were obtained when the ratio of the diameter of the silica to latex particle was greater than 3.…”

Section: Electrostatic Interactionsmentioning

confidence: 99%

“…Harley, Thomson, and Vincent used thin-film freeze-drying scanning electron microscope (TFFDSEM) [19] as a visualization method to study the heterocoagulation of monodisperse anionic polymer latexes of various diameters made using potassium persulfate as initiator (i.e., polystyrene spheres of 696, 320, and 180 nm and a poly(vinylidene chloride) latex of 116 nm) onto a large cationic polystyrene latex of 2170 nm in diameter, using azobis(isobutylamidine)dihydrochloride as initiator [20]. Adsorption isotherms of the four sets of negatively charged particles onto the large cationic microspheres were of the "high-affinity" type, in 0.5 mM KCl background electrolyte.…”

Section: Electrostatic Interactionsmentioning

confidence: 99%

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Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Teixeira

Bon

2010

Hybrid Latex Particles

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In this chapter, we will highlight conceptual physical approaches towards the fabrication of nanocomposite polymer latexes in which each individual latex particle contains one or more "hard" nanoparticles, such as clays, silicates, titanates, or other metal(oxides). By "physical approaches" we mean that the "hard" nanoparticles are added as pre-existing entities, and are not synthesized in situ as part of the nanocomposite polymer latex fabrication process. We will narrow our discussion to focus on physical methods that rely on the assembly of nanoparticles onto the latex particles after the latex particles have been formed, or its reciprocal analogue, the adhesion of polymer onto an inorganic nanoparticle. First, will discuss the phenomenon of heterocoagulation and its various driving forces, such as electrostatic interactions, the hydrophobic effect, and secondary molecular interactions. We will then address methods that involve assembly of nanoparticles onto or around the more liquid precursors (i.e., swollen/growing latex particles or monomer droplets). We will focus on the phenomenon of Pickering stabilization. We will then discuss features of particle interaction with soft interfaces, and see how the adhesion of particles onto emulsion droplets can be applied in suspension, miniemulsion, and emulsion polymerization. Finally, we will very briefly mention some interesting methods that make use of interface-driven templating for making well-defined assembled clusters and supracolloidal structures.

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Section: Electrostatic Interactionsmentioning

confidence: 99%

Section: Electrostatic Interactionsmentioning

confidence: 99%

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Teixeira

Bon

2010

Hybrid Latex Particles

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“…Since the early 1990s, heteroaggregation studies have been carried out on systems containing oppositely charged particles [1,17,18]. Now heteroaggregation and heteroflocculation of smart particles is of increasing interest due to the technological importance of developing materials and separation processes that can be controlled remotely and contain advanced functionality on the nanometer scale.…”

Section: Heteroaggregation Of Smart Systemsmentioning

confidence: 99%

Stimulus-Responsive Heteroaggregation of Colloidal Dispersions: Reversible Systems and Composite Materials

2011

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Abstract:Heteroaggregation is the aggregation of mixed particle systems where the colloidal particles may differ in charge, size and chemical composition. The phenomenon of heteroaggregation is of great relevance in industrial processes and the natural environment. This review will focus on binary heteroaggregation where at least one of the particles is a stimulus-responsive smart particle. Aggregation under various conditions of pH, temperature, light and relative concentration can be induced by the careful manipulation of any one or more of these environmental conditions during the heteroaggregation of smart particles. Stimulus response provides the potential for reversibility from an aggregated to a stable system and exceptional control over inter-particle interactions. The significant fundamental and applied studies that have made an impact in this area will be discussed.

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“…One of the first examples of the hetero-flocculation of smaller particles on larger particles was reported by Vincent and collaborators. [89] They used careful control of the charge to cause the adsorption of small colloidal particles onto larger, oppositely-charged colloidal particles. Since this pioneering work, others have gone on to attach inorganic nanoparticles, nanotubes, or clay platelets onto larger colloidal polymer spheres.…”

Section: Colloidal Hybrids By Hetero-flocculationmentioning

confidence: 99%

Design and fabrication of colloidal polymer nanocomposites

Wang¹,

Keddie²

2009

Advances in Colloid and Interface Science

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The adsorption of small particles onto larger particles of opposite charge Direct electron microscope studies

Cited by 104 publications

References 19 publications

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Stimulus-Responsive Heteroaggregation of Colloidal Dispersions: Reversible Systems and Composite Materials

Design and fabrication of colloidal polymer nanocomposites

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