Theory of steric stabilization of colloid dispersions by grafted polymers

Zhulina, Ekaterina B.; Borisov, Oleg V.; Priamitsyn, V. A.

doi:10.1016/0021-9797(90)90423-l

Cited by 365 publications

(387 citation statements)

References 11 publications

Supporting

Mentioning

373

Contrasting

Order By: Relevance

“…The stabilisation mechanism could be either steric 46 , electrostatic 47 or a combination of both. Many researchers have reported that nanoparticles cannot be stabilised easily in high salinity water [48][49][50][51][52] , especially when the ionic strength exceeds the critical salt concentration (CSC) 48 .…”

Section: Nanofluid Stabilitymentioning

confidence: 99%

Nanoparticle-Assisted Water-Flooding in Berea Sandstones

Azmi

Raza

et al. 2016

Energy Fuels

View full text Add to dashboard Cite

ABSRACT:The use of nanoparticles (NP) to improve reservoir characterisation or to enhance oil recovery (EOR) has recently received intensive interest; however there are still many un-resolved questions. This work reports a systematic study of the effect of rutile TiO 2 nanoparticle-assisted brine flooding. Rutile ellipsoid TiO 2 nanoparticles were synthesised and stabilised by tri-sodium citrate dehydrate for brine flooding of water-wet Berea sandstone cores. Careful characterisation of the rock samples and nanomaterials before and after the flooding was conducted, and the relative contributions to the modified flooding results from the stabiliser and the nanoparticles of different concentrations were examined. The oil recovery performance was evaluated both at break-through (BT) point and at the end of flooding (~3.2 pore volumes). Nanoparticle migration behavior was also investigated in order to understand the potential mechanisms for oil recovery. The results showed that both nanoparticle transport rate and EOR effect were strongly dependent on the particle concentration. The oil recovery efficiency at the BT point was found to increase at low nanoparticle concentrations but decrease at higher values. A maximum 33% increase of the recovery factor was observed at the BT point for a TiO 2 concentration of 20 ppm, but higher nanoparticle concentrations usually had higher ultimate recovery factors. The presence of oil phase was found to accelerate the particle migration though the core. The discussion of various mechanisms suggested that the improvement in the mobility ratio, possible wettability change and log-jamming effect were responsible for the observed phenomena.

show abstract

Section: Nanofluid Stabilitymentioning

confidence: 99%

Nanoparticle-Assisted Water-Flooding in Berea Sandstones

Azmi

Raza

et al. 2016

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7] We have been investigating the nanostructure and the transition of the polyelectrolyte brush in the ionic amphiphilic diblock copolymer monolayer at the air/water interface by utilizing surface pressure -area (π-A) isotherm and X-ray and neutron reflectivity techniques. [8][9][10][11][12][13] The primary advantage of monolayer systems for brush study is easy control/change of brush density (number of brush chains in unit area) and precise control of molecular weight and the distribution of brush chains.…”

Section: Introductionmentioning

confidence: 99%

Nanostructure of Cationic Polymer Brush at the Air/Water Interface

Matsuoka

Fujita

Ghosh

et al. 2013

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. Cationic amphiphilic diblock copolymers were synthesized by RAFT polymerization and the nanostructure of their monolayers was investigated by π-A isotherm and X-ray reflectivity. Carpet layer (dense hydrophilic block layer) formation under the hydrophobic layer was confirmed and a "brush" layer was found beneath the carpet layer. However, the thickness of brush layer was much thinner than that of the fullystretched chain length. The critical salt concentration was found to be 0.01 M NaCl, which is much lower than that of the previous strongly anionic brush. These differences were probably caused by the low effective charge on the brush chains due to the hydrophobic nature of the quarternized ammonium cation.

show abstract

“…In the most simple model for a brush the monomer density is assumed uniform throughout the grafted layer, the so-called Alexander-de Gennes model [11,12]. Although several more refined models based on nonuniform density distributions normal to the grafting surface have been presented [13][14][15], the simple Alexander-de Gennes model has been surprisingly successful in predicting scaling relationships for the brush height and surface pressure as a function of the grafting density and chain length [16]. We refer the reader to the mentioned reviews and references therein for more details [9,10].…”

Section: Introductionmentioning

confidence: 99%

Stuffed brushes: theory and experiment

Currie¹,

Gucht²,

Borisov³

et al. 1999

Pure and Applied Chemistry

View full text Add to dashboard Cite

Abstract:The interaction between polymer brushes and mesoscopic particles is investigated both theoretically and experimentally. We present an analytical mean-field theory for a polymer brush (a layer of long polymer chains end-grafted to a substrate) with varying excluded volume interactions between monomer units. This system mimics the reversible adsorption of mesoscopic particles, such as surfactant micelles or proteins, on the grafted chains. The equilibrium structural properties of the brush (the brush thickness and overall degree of complexation) as well as the number of adsorbed particles per unit area, ⌫, are analysed as functions of the affinity between particle and chain, grafting density and excluded volume interactions. In our model ⌫ is found to have a maximum as a function of . Experimentally the adsorption of BSA on a hydrophobic substrate with grafted PEO chains is measured with reflectometry. In the case of short grafted chains the adsorbed amount of BSA, ⌫, decreases continuously with increasing , which agrees with previous results and model calculations in the literature. In the case of long PEO chains, however, ⌫ is found to have a maximum as a function of . Qualitatively the experimental dependence of ⌫ on is found to agree with the results of our mean-field model. PEO chains show no affinity for BSA in the bulk, whereas in a grafted conformation an effective attraction is found. Some comments are made on the nature of this affinity, which is not yet fully understood.

show abstract

Theory of steric stabilization of colloid dispersions by grafted polymers

Cited by 365 publications

References 11 publications

Nanoparticle-Assisted Water-Flooding in Berea Sandstones

Nanoparticle-Assisted Water-Flooding in Berea Sandstones

Nanostructure of Cationic Polymer Brush at the Air/Water Interface

Stuffed brushes: theory and experiment

Contact Info

Product

Resources

About