Interfacial Properties of Barium Sulfate Suspensions. Implications in Their Stability

Gallardo, V.; Zurita, L.; Ontiveros-Ortega, A.; Durán, J.D.G.

doi:10.1002/1520-6017(200009)89:9<1134::aid-jps5>3.0.co;2-d

Cited by 10 publications

(11 citation statements)

References 21 publications

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“…32 To substantiate the hypothesis of the Nernstian behavior of BaSO 4 , the maximum slope of the pBa -ζ plot of Figure 6 was calculated. In the 1 mM KCl background electrolyte, the slope was 83.0 mV per pBa unit, which is three times larger than expected from Nernst's law.…”

Section: Resultsmentioning

confidence: 76%

“…Earlier investigation already reported that suspension of BaSO 4 in deionized water is slightly negative (−5 mV) and the presence of an additional 10 −5 M SO 2− 4 brought about a negative surface charge of −15 mV. 32 So, when only Ba 2+ and SO 2− 4 are used, the ζ-potential can be changed between −13 mV to +23 mV. Because of the steep slope in the pBa -ζ curve, the surface potential of BaSO 4 in dilute solutions can be controlled by small differences in Ba 2+ concentration, namely with 0.1 mM to 1.5 mM Ba 2+ .…”

Section: Resultsmentioning

confidence: 99%

“…The equilibrium concentration of Ba 2+ is insufficient for BaSO 4 to obtain a positive ζ-potential as was described in the past by others. 32 In the same reports, BaSO 4 also obtained a negative surface charge when suspended in pure water, indicating that the amount of free Ba 2+ resulting from dissolution is below the isoelectric point in terms of [Ba 2+ ].…”

Section: Resultsmentioning

confidence: 99%

“…The isoelectric point is situated around a pBa of 3.3 in 1 mM KCl, close to reported values between 3.4 and 4.3. 32 With a further increase of [Ba 2+ ] the ζ-potential becomes larger than +20 mV already at a pBa of 2.9 which corresponds to a Ba 2+ -concentration of only 1.5 mM, and the ζ-potential seems to level off. Also this observation is confirmed in literature, where a concentration increase of 5 10 −6 M of Ba 2+ was enough to invert the surface charge and further addition leads to potentials > +20 mV.…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Surface Charge on the Deposition Rate of Particles with Metals

Soccol

Ntumba-Ngoy

Claessens

et al. 2014

J. Electrochem. Soc.

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The influence of ζ-potential on the electrodeposition of particles with metals was investigated by the codeposition of three different types of particles (BaSO 4 , CaF 2 and K 1.33 Mn 8 O 16 ) with three different metals (nickel, copper and zinc) from seven different, unsupported (binary) and well-supported plating solutions across the whole pH range. The surface charge of the particles in the plating solutions was modified by adding potential determining ions that are electrochemically silent. The surface charging behavior of the different particles was determined in indifferent electrolytes and in diluted plating baths. In all cases, making the surface potential more positive increased the deposition rate of particles, while if the surface charge is reduced or made negative, the deposition rate of particles decreased. By comparing the magnitudes of the different forces acting on particles and how they are affected by changes in the surface charge of the particles, we conclude that the change in the codeposition are due to either a change in the mass transport of particles by the electrophoretic force or a change in the particle-electrode adhesion due to the double layer force.Electrodeposition of metals and alloys allows easy control over coating thickness and morphology, but the coating properties are restricted to those of the deposited metals. 1 To improve or add specific properties to the coating, particles can be added to the plating bath. As a result, metal matrix composite coatings are formed by incorporation of the particles in the coating during electrodeposition. During the past decades, the electrolytic deposition of such dispersion coatings has become an important industrial technology with applications such as wear resistance 2-6 and corrosion resistance. 7,8 Other, more recent applications include thermal regulation and thermal actuation by codeposition of phase change materials, 9,10 selflubricating coatings containing oil microcapsules 11 and permanent hydrophobicity. 12 The extent to which particles modify the coating properties is determined, to first order, by the amount of particles that are incorporated into the metal. Contrary to what one might expect, the amount of codeposited particles is often disappointingly low (below 1 vol%) despite the fact that particle concentrations of 100 g/L or more are used. Hence, ways have been sought to increase the rate of particle deposition and to understand why in some cases, the codeposition rate is so low.In the past, it was shown that the hydrophobicity and the surface conductivity of particles strongly influences their incorporation during electrodeposition. 13-16 Also the sign and magnitude of the particle surface charge has been mentioned as an important factor and various authors believe that a positive surface charge aids codeposition. [17][18][19][20] During electroplating, the cathode is polarized negatively. Thus it is not surprising that people believed that positively charged particles would be electrophoretically or electrostatically attra...

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Surface Charge on the Deposition Rate of Particles with Metals

Soccol

Ntumba-Ngoy

Claessens

et al. 2014

J. Electrochem. Soc.

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“…At salt content of 7.5 g/L or more, the rate of scale inhibition is observed to be more than 90%. It is seen that barium sulfate scale inhibition efficiency is better at the higher concentration of NaCl, i.e., concentration higher than 7.5 g/L or more is suitable for scale inhibition (Luo et al 2015;Gallardo et al 2000). Temperature Figure 8 shows the test results of inhibition efficiency at temperature 70-120 °C, at higher temperature of 90 °C minimum inhibitor dosages increases.…”

Section: Effect On Inhibition Performance Of Copolymermentioning

confidence: 97%

Synthesis and characterization of maleic acid and sodium methallyl disulfonate new copolymer: application as a barium sulfate scale inhibitor

Kommanapalli

Lyot

Sunkara

et al. 2018

J Petrol Explor Prod Technol

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A water-soluble copolymer of maleic acid (MA) and sodium methallyl disulfonate (SMADS) were synthesized by aqueous solution free radical polymerization and evaluated as scale inhibitor for barium sulfate. The copolymer was characterized by FTIR, HNMR, GPC and HPLC results verified the structure of MA-SMADS copolymer and molecular weight was about 1050 g/mol. The experimental results indicates that the optimal conditions for copolymer synthesis are 105 °C, monomer dosage 30% (wt) and sodium persulfate (NaPS) dosage 7%. The inhibition performance of polymer on barium sulfate was evaluated through static bottle test and the static inhibition rate on barium sulfate can reach up to 98%. Consequently, the evaluation criteria was carried out by dynamic scale loop test.

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Radiopaque, barium sulfate‐filled biomedical compounds of a poly(ether‐block‐amide) copolymer

Guo

2008

J of Applied Polymer Sci

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Various radiopaque compounds of a poly (ether‐block‐amide) copolymer resin filled with fine barium sulfate particles were prepared by melt mixing. Material properties of the filled compounds were investigated using various material characterization techniques, including thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic rheometry, uniaxial tensile test, and dynamic mechanical thermal analysis (DMTA). The effects of the filler and its concentration on the measured material properties are evaluated. It has been found that in addition to its well‐known X‐ray radiopacity, the filler is quite effective in reinforcing some mechanical properties of the copolymer, including modulus of elasticity and yield strength. More interestingly, it has been observed that at low loading concentrations near 10 wt %, the filler may also act as a rigid, inorganic toughener for the copolymer by improving the postyield material extensibility of strain hardening against ultimate material fracture. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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Interfacial Properties of Barium Sulfate Suspensions. Implications in Their Stability

Cited by 10 publications

References 21 publications

The Effect of Surface Charge on the Deposition Rate of Particles with Metals

The Effect of Surface Charge on the Deposition Rate of Particles with Metals

Synthesis and characterization of maleic acid and sodium methallyl disulfonate new copolymer: application as a barium sulfate scale inhibitor

Radiopaque, barium sulfate‐filled biomedical compounds of a poly(ether‐block‐amide) copolymer

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