PEO Flocculation with Phenolic Microparticles

Lu, Chen; Pelton, Robert

doi:10.1006/jcis.2002.8551

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…These systems, like blood, proteins in water, milk, black ink or paints, are important in our everyday lives, in biology and industry [1,2]. It is crucial, for example, to control the process of aggregation in paint and paper industries [3], or to favour the protein crystallization in the production of pharmaceuticals and photonic crystals [4,5].A practical and exciting feature of colloidal suspensions is that the interaction energy between particles can be well controlled [6][7][8]. In fact particles can be coated and stabilized leading to a hard sphere behaviour, and an attractive depletion interaction can be brought out by adding some non-adsorbing polymers.…”

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Columnar and lamellar phases in attractive colloidal systems

et al. 2006

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In colloidal suspensions, at low volume fraction and temperature, dynamical arrest occurs via the growth of elongated structures, that aggregate to form a connected network at gelation. Here we show that, in the region of parameter space where gelation occurs, the stable thermodynamical phase is a crystalline columnar one. Near and above the gelation threshold, the disordered spanning network slowly evolves and finally orders to form the crystalline structure. At higher volume fractions the stable phase is a lamellar one, that seems to have a still longer ordering time.PACS numbers: 82.70. Dd, 64.60.Ak, 82.70.Gg In colloidal suspensions solid (or liquid) mesoscopic particles are dispersed in another substance. These systems, like blood, proteins in water, milk, black ink or paints, are important in our everyday lives, in biology and industry [1,2]. It is crucial, for example, to control the process of aggregation in paint and paper industries [3], or to favour the protein crystallization in the production of pharmaceuticals and photonic crystals [4,5].A practical and exciting feature of colloidal suspensions is that the interaction energy between particles can be well controlled [6][7][8]. In fact particles can be coated and stabilized leading to a hard sphere behaviour, and an attractive depletion interaction can be brought out by adding some non-adsorbing polymers. The range and strength of the potential are controlled respectively by the size and concentration of the polymer [8,9]. Recent experimental works highlighted the presence of a net charge on colloidal particles [7,10] giving rise to a long range electrostatic repulsion in addition to the depletion attraction.The competition between attractive and repulsive interactions produces a rich phenomenology and a complex behavior as far as structural and dynamical properties are concerned. For particular choices of the interaction parameters, the aggregation of particles is favoured but the liquid-gas phase transition can be avoided and the cluster size can be stabilized at an optimum value [11]. Experimentally, such a cluster phase made of small equilibrium monodisperse clusters is observed using confocal microscopy at low volume fraction and low temperature (or high attraction strength) [7,10,12]. Increasing the volume fraction, the system is transformed from an ergodic cluster liquid into a nonergodic gel [10,12], where structural arrest occurs. Using molecular dynamic simulations, we showed that such structural arrest is crucially related to the formation of a long living spanning cluster, providing evidence for the percolation nature of the colloidal gel transition at low volume fraction and low temperature [13,14]. This scenario was confirmed by recent experiments [10] and molecular dynamics simulations [15], where it was shown that increasing the volume fraction clusters coalesce into elongated structures eventually forming a disordered spanning network. A realistic framework for the modelization of these systems is represented by DLVO interaction p...

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Columnar and lamellar phases in attractive colloidal systems

et al. 2006

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“…Details of the preparation and characterization of core-shell latexes have been reported in the previous paper. 27 Table 1 lists the weight average particle diameters measured by a BI-DCP particle sizer (Brookhaven Instrument Co.) and intensity average particle diameters by dynamic light scattering (DLS) using a Lexel laser (wavelength 514 nm) equipped with a BI-9000 AT digital correlator (Brookhaven). The light scattering was measured at a The DLS error limits show the standard deviations of the mean based on 5 measurements.…”

Section: Methodsmentioning

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PEO Flocculation of Polystyrene-Core Poly(vinylphenol)-Shell Latex: An Example of Ideal Bridging

Pelton

2001

Langmuir

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The poly(ethylene oxide) (PEO) induced flocculation of polystyrene latex (PS) and polystyrene-core poly(p-vinylphenol)-shell (PS-PVPh) latexes were compared. PEO gave much more effective flocculation of the core-shell particles, and flocculation was observed over a much greater range of PEO concentrations. The core-shell particles were able to adsorb 6-7 times more PEO than comparable sized polystyrene latex. It is proposed that the efficient flocculation and the PEO high adsorption capacity of core-shell particles shows that adsorbed PEO molecules do not spread upon the poly(vinylphenol) surface. The polymer spreading model of Pelssers, Cohen Stuart, and Fleer was extended to account for the available surface area when an adsorbed flocculant molecule spreads on a surface. The revised model, coupled with conventional kinetic expressions for flocculation and polymer adsorption, gave good predictions of a wide variety of flocculation behaviors.

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“…It is common to use co‐factors to improve affinity of PEO into fibers in pulp and paper processes. Typically, co‐factors contain aromatic rings8 and the water solubility of the co‐factor is increased with acid, hydroxyl groups or cationic groups 9. It is assumed that PEO acts as a dispersing agent.…”

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confidence: 99%

Poly(ethylene oxide)‐block‐poly[2‐(dimethylamino)ethyl methacrylate] as Strengthening Agent in Paper: Dynamic Mechanical Characterization

Vesterinen¹,

Rich²,

Myllytie³

et al. 2010

Macro Materials & Eng

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To enhance adhesion properties of PEO on wood fibers, block polymers of PEO and 2‐(dimethylamino)ethyl methacrylate were synthesized. The polymers were further modified to obtain strongly cationic species. The resulting polymers were used as additives in paper sheets. Papers were studied by DMA in a controlled‐humidity chamber. Addition of the PEO block co‐polymers enhanced paper strength. The strength of the paper sheets was highest when polymer with molecular weight of 400 kg · mol−1 was used as an additive. Highly cationic block co‐polymers increased moduli of paper sheets more than their weakly cationic analogs, which indicated strong interaction with fiber surfaces. Strength of the paper sheets decreased both with increased temperature and humidity.magnified image

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PEO Flocculation with Phenolic Microparticles

Cited by 8 publications

References 12 publications

Columnar and lamellar phases in attractive colloidal systems

Columnar and lamellar phases in attractive colloidal systems

PEO Flocculation of Polystyrene-Core Poly(vinylphenol)-Shell Latex: An Example of Ideal Bridging

Poly(ethylene oxide)‐block‐poly[2‐(dimethylamino)ethyl methacrylate] as Strengthening Agent in Paper: Dynamic Mechanical Characterization

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