The mechanism of adsorption of poly(ethylene oxide) flocculant on silica

Rubio, J.; Kitchener, J. A.

doi:10.1016/0021-9797(76)90182-x

Cited by 303 publications

(170 citation statements)

References 16 publications

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“…Both poly(ethylene oxide) (PEO) and poly(Nvinylpyrollidone) (PVP) have received much attention [13][14][15][16][17][18][19][20]. Experiments have been carried out on both colloidal silica and planar silica surfaces, using NMR, ellipsometry, reflectometry, and x-ray and neutron scattering and reflection.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of charged and neutral polymer chains on silica surfaces: The role of electrostatics, volume exclusion, and hydrogen bonding

2015

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We develop an off-lattice (continuum) model to describe the adsorption of neutral polymer chains and polyelectrolytes to surfaces. Our continuum description allows taking excluded volume interactions between polymer chains and ions directly into account. To implement those interactions, we use a modified hard-sphere equation of state, adapted for mixtures of connected beads. Our model is applicable to neutral, charged, and ionizable surfaces and polymer chains alike and accounts for polarizability effects of the adsorbed layer and chemical interactions between polymer chains and the surface. We compare our model predictions to data of a classical system for polymer adsorption: neutral poly(N -vinylpyrrolidone) (PVP) on silica surfaces. The model shows that PVP adsorption on silica is driven by surface hydrogen bonding with an effective maximum binding energy of about 1.3 k B T per PVP segment at low pH. As the pH increases, the Si-OH groups become increasingly dissociated, leading to a lower capacity for H bonding and simultaneous counterion accumulation and volume exclusion close to the surface. Together these effects result in a characteristic adsorption isotherm, with the adsorbed amount dropping sharply at a critical pH. Using this model for adsorption data on silica surfaces cleaned by either a piranha solution or an O 2 plasma, we find that the former have a significantly higher density of silanol groups.

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Section: Introductionmentioning

confidence: 99%

Adsorption of charged and neutral polymer chains on silica surfaces: The role of electrostatics, volume exclusion, and hydrogen bonding

2015

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“…Besides, polyethers are reported to favor the untreated clay layers intercalation. Polyether/clay interactions have been studied for years [30]. Particularly, polyethylene oxide (PEO) is even used to quantify the clay surface area [31] as its adsorption is fast and precisely quantified.…”

Section: Introductionmentioning

confidence: 99%

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Touchaleaume¹,

Soulestin²,

Sclavons³

et al. 2011

Express Polym. Lett.

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Abstract. Polyether-block-amide (PEBA) /clay nanocomposites were prepared water-assisted by twin-screw extrusion. Both organomodified and pristine (i.e. purified but non-modified) montmorillonite clays were used. A high-pressure differential scanning calorimetry analysis carried out in the processing conditions demonstrated that PEBA/water blend exhibits some miscibility and that amide blocks and water behave as a single phase. In addition to a significant decrease of the melting temperature, water injected into the melt plays a key role among the filler dispersion and prevents the matrix from degradation during melt-extrusion. This process enables the compounding of pristine clay-based nanocomposites whose dispersion state is high enough for the resulting mechanical performances in tension to be at least equivalent to what is reached with organomodified clay. Effects of the nanofiller dispersion onto the macromolecules' mobility are detailed and fracture mechanisms are identified for the various structures.

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“…13 nm). In addition, since electrostatic interaction is a main driving force for adsorbing enzymes into MS spheres, enzymes with opposite charge to the MS material (PI ~2) [29] is beneficial for obtaining high loading.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Biocompatible polypeptide microcapsules via templating mesoporous silica spheres

Yu¹,

Gentle²,

Lu³

2009

Journal of Colloid and Interface Science

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We reported the stepwise formation of biocompatible poly(L-lysine)/poly(Lglutamic acid) (PLL/PGA) multilayer films on mesoporous silica (MS) spheres via layer-by-layer (LbL) self-assembly technique. In-situ QCM revealed the nonlinear (exponential) growth of PLL/PGA multilayer films at both pH 5.5 and pH 7.0 conditions. ξ-potential measurements of the multilayer coated particles indicated that the multilayer surface is being charge-overcompensated in each adsorption step, thereby facilitating adsorption of the next oppositely charged polypeptide onto the MS spheres. Hollow polypeptide capsules could be obtained by subsequently removing silica cores. By using enzyme-preloaded MS spheres as capsule templates, a general approach was developed for encapsulating enzymes in biocompatible microcapsules with high loading and retained bioactivity. The loading amount for several enzymes with different sizes and their bioactivity after encapsulation were also reported.

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The mechanism of adsorption of poly(ethylene oxide) flocculant on silica

Cited by 303 publications

References 16 publications

Adsorption of charged and neutral polymer chains on silica surfaces: The role of electrostatics, volume exclusion, and hydrogen bonding

Adsorption of charged and neutral polymer chains on silica surfaces: The role of electrostatics, volume exclusion, and hydrogen bonding

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Biocompatible polypeptide microcapsules via templating mesoporous silica spheres

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