Effect of polymer molecular weight on the absorption of polyacrylic acid at the alumina-water interface

Santhiya, Deenan; Nandini, G; Subramanian, S.; Natarajan, K.A.; Malghan, S.G.

doi:10.1016/s0927-7757(97)00132-5

Cited by 60 publications

(33 citation statements)

References 27 publications

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“…Secondly, the results point to the importance of the molecular weight of these OMs as the trend observed for OM adsorption and mineral depression (HA > TA > FA) is the same as the trend of their molecular weight (Table 1). This is in agreement with literature results showing that higher molecular weight polymers adsorb more than lower molecular weight ones because of their lower solubility in water and higher number of functional groups to anchor on mineral sites [11,46,47]. Indeed, OMs with a high molecular weight and a high number of functional groups have been shown to exhibit higher affinities for mineral surfaces [48][49][50][51] containing many non-identical binding sites [52,53].…”

Section: Discussionsupporting

confidence: 91%

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

2016

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Abstract:One of the water constituents that has not been investigated in great detail for potential detrimental effect on mineral flotation is organic matter. This study investigates the effect of natural organic materials contained in water, such as humic, fulvic and tannic acids, on the flotation of copper and molybdenum sulphides in alkaline conditions and in concentrations similar to those found in natural waters. Results show that copper and molybdenum grades decreased with the addition of humic, tannic and fulvic acid in that order, with a larger depression of molybdenite grade and recovery. Adsorption studies using ultraviolet (UV)-visible spectroscopy and X-ray photoelectron spectrometer (XPS) surface analysis confirmed that these organic materials were adsorbed on the minerals surface. Complimentary analyses of froth characteristics, particle size distribution and fine particles entrainment were also conducted to explain the cause of the negative effect of these organic materials on flotation. The flotation results were explained in terms of the decrease in the hydrophobicity of the mineral surfaces due to the adsorption of hydrophilic groups in these organic materials which then prevent bubble-particle adhesion. The larger detrimental effect of humic acid is due to its higher adsorption on the minerals, high molecular weight and carbon content compared with the other organic acids used.

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Section: Discussionsupporting

confidence: 91%

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

2016

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“…3(a, b) show the pH dependence of the effect on the ζ and ESA values by addition of optimum amount (0.4 mass%) of Dolapix CE64 to the 2 vol% α-Al2O3 suspension. 6) As, it can be seen from Fig. 3, the optimum amount of dispersant in alumina suspension reduced the values of both ζ and ESA from their initial positive values at pH < 9.8; above this pH, the alumina particles were negatively charged but adsorption still occurred, to increase the negative ζ and ESA values.…”

Section: Jcs-japanmentioning

confidence: 82%

“…3)-5) Santhiya et al 6) was measured the adsorption of Poly (acrylic acid) on a 2 mass% suspension via equilibration and centrifugation, followed by chemical analysis, whereas the ζ value was measured on a 0.01% suspension via micro-electrophoresis. The important properties in determining the rheological characteristics of concentrated colloidal suspensions are the ζ-potential of the suspended particle and the isoelectric point (IEP) of the suspension.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic sonic amplitude measurement of concentrated alumina suspensions: Effect of electrosteric stabilization

Sarraf

Herbig²

2008

J. Ceram. Soc. Japan

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“…This implies to work in a limited pH range. For alumina dispersions, it has been shown that PAA produces significant effects when pH is in the range from 6 to 11 [8,15,38] The molecular weight of the polymer has also a wide incidence. It must be chosen according to the size of the particles to be dispersed.…”

Section: Dispersantsmentioning

confidence: 99%

Earthen construction: an increase of the mechanical strength by optimizing the dispersion of the binder phase

Moevus¹,

Jorand

Olagnon

et al. 2015

Mater Struct

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract Although of interest for its low embodied energy content for construction, earth is usually not used for modern construction due to the expensive, artisanal and complicated process and the high variability of the raw material. The transfer of techniques dedicated to cement concrete could help the industrialization of this material. The use of dispersant for an improved dispersion of the earth powder has been investigated for both dispersion of earth fine fraction and water (here named the binding phase) and mortar made with calibrated sand. An improvement of the rheology is observed with lower viscosity and yield stress. This leads to a very small improvement of the density however concomitant with a marked increase of the mechanical properties, Young modulus and compressive strength. The analysis of the microstructure of the mortar shows an increase of the largest pores, and a decrease of the clay platelets flocs. The evolutions of these properties are analyzed in terms of the Rumpf model at two different scales. The dispersant mainly acts on the platelet arrangement that defines the forces between particles, but also simultaneously decreases the permeability of this binding phase, therefore entrapping more air during the mixing of the powder and water. Clearly the use of a dispersant may be of interest for the processing of earth material on liquid state, decreasing the viscosity and/or allowing the reduction of the water content, and finally improving strength.

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Effect of polymer molecular weight on the absorption of polyacrylic acid at the alumina-water interface

Cited by 60 publications

References 27 publications

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

Electrokinetic sonic amplitude measurement of concentrated alumina suspensions: Effect of electrosteric stabilization

Earthen construction: an increase of the mechanical strength by optimizing the dispersion of the binder phase

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