Zeta potential measurement of calcium carbonate

Moulin, Philippe; Roques, H.

doi:10.1016/s0021-9797(03)00057-2

Cited by 196 publications

(152 citation statements)

References 20 publications

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“…The In the presence of carbonate buffer, additional ions, clusters, and nano-particles could also form [12,13,22] The complex formation of Ca þ þ ions seem to consume some OH À ions, which cannot diffuse into the pH probe, and therefore, the pH values were measured to be lower than it should be, while the charged species were reported by the conductivity measurement. As can be seen from the figure, the conductivity values started to decrease as soon as the CO 2 bubbles were injected into the solution while the decrease in pH was step-wise.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, production of nano calcite can be achieved by recrystallization; such that the mineral CaCO 3 is converted to calcium oxide (CaO) by calcination, hydrated to calcium hydroxide (Ca(OH) 2 ) and recrystallize by carbon dioxide (CO 2 ) [3][4][5][6]. Obtaining CaCO 3 particles in nano sizes with homogeneous size distribution and different morphologies is difficult due to agglomeration of newly synthesized clusters [7][8][9][10], which is related to the surface potential of the colloidal CaCO 3 particles [11][12][13][14]. Also, there is a huge effort to produce hollow nano-CaCO 3 particles with homogenous size distribution and different morphologies, which is rare in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Particles with zeta potentials more positive than þ30 mV or more negative than À 30 mV are considered stable [20]. The zeta potential values for the CaCO 3 have been reported in the literature sometimes positive, sometimes negative, and sometimes variable zeta potential values [13]. The point of zero charge (PZC) of CaCO 3 exists around 9-10 although the zeta potential of colloids is pH-dependent [21].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rice-like hollow nano-CaCO 3 synthesis

Ulkeryildiz¹,

Kilic²,

Ozdemir³

2016

Journal of Crystal Growth

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a b s t r a c tWe have shown that Ca(OH) 2 solution is a natural stabilizer for CaCO 3 particles. We designed a CO 2 bubbling crystallization reactor to produce nano-CaCO 3 particles in homogenous size distribution without aggregation. In the experimental set-up, the crystallization region was separated from the stabilization region. The produced nanoparticles were removed from the crystallization region into the stabilization region before aggregation or crystal growth. It was shown that rice-like hollow nano-CaCO 3 particles in about 250 nm in size were produced with almost monodispersed size distribution. The particles started to dissolve through their edges as CO 2 bubbles were injected, which opened-up the pores inside the particles. At the late stages of crystallization, the open pores were closed as a result of dissolution-recrystallization of the newly synthesized CaCO 3 particles. These particles were stable in Ca(OH) 2 solution and no aggregation was detected. The present methodology can be used in drug encapsulation into inorganic CaCO 3 particles for cancer treatment with some modifications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rice-like hollow nano-CaCO 3 synthesis

Ulkeryildiz¹,

Kilic²,

Ozdemir³

2016

Journal of Crystal Growth

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“…3 shows an SEM image of these solids. The natural pH of the suspension was 8.65 (measured on a calibrated Mettler Toldeo 320 pH meter) and at this pH the Zeta potential has been reported to be −43.7 mV [33]. The cake concentration formed on the microfilter was determined by discharging the cake (after draining) in to weighed dishes and drying to constant mass.…”

Section: Suspension Characterisationmentioning

confidence: 99%

A comparison of azimuthal and axial oscillation microfiltration using surface and matrix types of microfilters with a cake-slurry shear plane exhibiting non-Newtonian behaviour

Holdich

Schou

Dragosavac

et al. 2018

Journal of Membrane Science

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“…Hirasaki and Zhang (2003) reported that the surface charge of the calcite becomes more negative with the presence of NaCO 3 and NaHCO 3 in the brine. Moulin and Roques (2003) reviewed work on zeta potential of calcite and concluded that disparate results are due to differences in the measurement conditions and the nature of the potential determining ions. It is generally accepted that ions such as Ca 2+ and CO 3 2-are the potential determining ions and that the isoelectric point of calcite is around pH 8 to 10.…”

Section: Solid Surfacesmentioning

confidence: 99%

Wettability and Oil Recovery by Imbibition and Viscous Displacement from Fractured and Heterogeneous Carbonates

Morrow¹,

Buckley²

2006

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About one-half of U.S. oil reserves are held in carbonate formations. The remaining oil in carbonate reservoirs is regarded as the major domestic target for improved oil recovery. Carbonate reservoirs are often fractured and have great complexity even at the core scale. Formation evaluation and prediction is often subject to great uncertainty. This study addresses quantification of crude oil/brine/rock interactions and the impact of reservoir heterogeneity on oil recovery by spontaneous imbibition and viscous displacement from pore to field scale.Wettability-alteration characteristics of crude oils were measured at calcite and dolomite surfaces and related to the properties of the crude oils through asphaltene content, acid and base numbers, and refractive index. Oil recovery was investigated for a selection of limestones and dolomites that cover over three orders of magnitude in permeability and a factor of four variation in porosity. Wettability control was achieved by adsorption from crude oils obtained from producing carbonate reservoirs. The induced wettability states were compared with those measured for reservoir cores. The prepared cores were used to investigate oil recovery by spontaneous imbibition and viscous displacement. The results of imbibition tests were used in wettability characterization and to develop mass transfer functions for application in reservoir simulation of fractured carbonates. Studies of viscous displacement in carbonates focused on the unexpected but repeatedly observed sensitivity of oil recovery to injection rate. The main variables were pore structure, mobility ratio, and wettability. The potential for improved oil recovery from rate-sensitive carbonate reservoirs by increased injection pressure, increased injectivity, decreased well spacing or reduction of interfacial tension was evaluated. Table A2. Contact angles on cleaved calcite after aging in crude oil (initially dry or wet with the same aqueous phase as that used to float off bulk oil)…………………………53 Table 2.1 Synthetic brine composition…………………………………………………..87 Table 2.2 Selected properties of crude oil samples………………………………………87 Table 2.3 Gambier and Edwards (GC) cores tested for the effect of initial water saturation. Table 2.4 Edwards (GC) cores tested for the effect of aging time for Cottonwood crude oil………………………………………………………………………………………...88 Table 2.5 Gambier and Edwards (GC) MXW-F cores tested for wetting stability and the effect of oil phase viscosity …………………………………………………………89 Table 3.1 Synthetic brine composition…………………………………………………104 Table 3.2 Edwards (GC) cores tested with different mineral oil viscosities…………...105 Table 3.3 Edwards (GC) cores tested for the effect of variation in core length (µ o = 3.8cP). Fig. 1.10 AFM image of calcite exposed first to (0.1M NaCl) brine then aged for 2 days and 21 days in E-1XD-00 crude oil (deflection image in water)………………………..37 Fig. 1.11 AFM image of calcite exposed first to (0.1M NaCl) brine then aged for 2 days and 21 days in Tensleep crude oil (deflection image...

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Zeta potential measurement of calcium carbonate

Cited by 196 publications

References 20 publications

Rice-like hollow nano-CaCO 3 synthesis

Rice-like hollow nano-CaCO 3 synthesis

A comparison of azimuthal and axial oscillation microfiltration using surface and matrix types of microfilters with a cake-slurry shear plane exhibiting non-Newtonian behaviour

Wettability and Oil Recovery by Imbibition and Viscous Displacement from Fractured and Heterogeneous Carbonates

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