Precipitation of different calcite crystal morphologies in the presence of sodium stearate

Ukrainczyk, Marko; Kontrec, Jasminka; Kralj, Damir

doi:10.1016/j.jcis.2008.09.045

Cited by 47 publications

(34 citation statements)

References 25 publications

(28 reference statements)

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“…Similar correlation between the morphology and the specific surface area of calcite was reported in the literature 5,10,22 and for the batch carbonation process in particular, in which scalenohedral calcite is regularly produced in the absence of any additives. A likely explanation for the observed formation of stable rhombohedral {104} calcite surfaces at lower calcium concentrations and less stable scalenohedral {214} surfaces at higher calcium concentrations is also in accordance with the fundamental precipitation principles, that postulate the formation of metastable, precursor, solid phases or less stable morphologies at a high driving force.…”

Section: Resultssupporting

confidence: 86%

“…This predetermined electrical conductivity was correlated with the concentration of total dissolved Ca(OH) 2 , c(Ca) tot , determined by means of an ion chromatography system ICS-1100 (Dionex) fitted with CS16 Analytical Column. 22 The flow of the Ca(OH) 2 suspension was stopped 10 min after starting the experiment, while the gas flow was kept constant until the endpoint of carbonation reaction. This point was indicated by an abrupt drop in conductivity and its subsequent increase.…”

Section: Methodsmentioning

confidence: 99%

“…Other important ways to influence on the PCC particle morphology are the use of magnetic field, 12,13 high pressure, 14,15 or a specific additive. [16][17][18][19][20][21][22] The paper industry uses a huge amount of calcium carbonate as a filler component. The more filler is applied, the cost of the final product is lower.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Calcium Carbonate by Semicontinuous Carbonation Method in the Presence of Dextrans

Kontrec¹,

Ukrainczyk²,

Babić-Ivančić³

et al. 2011

Croat. Chem. Acta

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Abstract. Precipitated calcium carbonate (PCC) was prepared by means of semicontinuous carbonation of Ca(OH) 2 suspension, at 35 and 45 °C and in the presence of non-ionic dextran and dextran sulfate. The carbonation process was regulated at different predetermined values of electrical conductivity, that corresponded to different concentrations of dissolved Ca(OH) 2 : 0.5 mS cm. The results of physicalchemical characterization of the product showed that calcite was the only polymorphic modification obtained in the whole range of experimental conditions investigated. In addition, it was found that morphology, crystal size distribution and specific surface area of PCC strongly depended on the electrical conductivity / concentration of dissolved Ca(OH) 2 , at which the process was performed: predominantly scalenohedral crystals of higher surface area (about 5 m 2 g −1) were produced at higher electrical conductivity, while at lower electrical conductivity predominantly rhomohedral calcite crystals of relatively low specific surface area were obtained. In the system of the highest electrical conductivity, κ 25 = 5.0 mS cm, and at 35 °C, the addition of non-ionic dextran significantly influenced the process by preventing the regulation. The crystals that appeared were in the form of irregular aggregates of high specific surface area, S ≈ 29 m 2 g −1. FT-IR and TG analyses indicated that the non-ionic dextran was adsorbed onto the calcite surface, most probably by relatively strong and specific interactions between oxygen from the hydroxyl groups of dextran molecules and calcium ions from the crystal surface. On the contrary, the anionic dextran (dextran sulfate) exerted minor effects in the course of semicontinuous carbonation process and in the properties of the final product, PCC. However, the analysis of the precipitate indicated that dextran sulfate was adsorbed at the surfaces, most probably by the weak and non-specific electrostatic interactions. (doi: 10.5562/cca1746)

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Section: Resultssupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Calcium Carbonate by Semicontinuous Carbonation Method in the Presence of Dextrans

Kontrec¹,

Ukrainczyk²,

Babić-Ivančić³

et al. 2011

Croat. Chem. Acta

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“…In order to fabricate calcium carbonate with desired crystallographic and morphological properties for tailored applications, the formation routes need to be controlled effectively. Over the past few decades, a substantial progress has been made in this field and many interesting phenomena have been unraveled which resulted in the formation calcium carbonate with intriguing shapes and properties [6][7][8][9][10][11][12]. In particular, the presence of organic additives such as surfactants, polymers, and biomolecules, during the mineralization process is found an important factor that influences the polymorph selection, nucleation and crystal growth.…”

Section: Introductionmentioning

confidence: 99%

Fast precipitation of uniform CaCO3 nanospheres and their transformation to hollow hydroxyapatite nanospheres

Wang¹,

Moo²,

Chen³

et al. 2010

Journal of Colloid and Interface Science

149

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“…The hydrophilic nature and tendency towards aggregation of nano CaCO 3 make it hardly usable in polymer matrixes and very difficult to be used at industrial scale production . The recent research on surface modification of nanosize CaCO 3 with hydrophobic species such as fatty acids leads to a great expansion in its applications (Ukrainczyk et al, 2009). Such surfactants can bind with certain crystal planes during crystal growth, thereby changing the particle morphology and surface properties from hydrophilic to hydrophobic (Lanzon et al, 2011;Wang et al, 2010;Sheng et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Preparation of superhydrophobic nanocalcite crystals using Box–Behnken design

El‐Sheikh

Barhoum

El-Sherbiny

et al. 2019

Arabian Journal of Chemistry

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Superhydrophobic nanocalcite crystals were prepared via an adjusted aqueous reaction of CaO, CO 2 gas and sodium oleate. Box-Behnken design was used to optimize the preparation parameters such as CaO concentration, CO 2 gas flow rate and surfactant concentration. The results revealed that the produced CaCO 3 is indexed to the calcite phase. The crystallite size, particle size, morphology, hydrophobicity and surface charge of CaCO 3 are significantly affected by changing the preparation parameters. The addition of sodium oleate helps in reducing the crystallite size from 101 nm to 48 nm, reducing the particle size from 1.5 lm length scalenohedral particles to 40 nm rhombohedral particles and modifying the properties of pure CaCO 3 from highly hydrophilic to superhydrophobic. ª 2014 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

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Precipitation of different calcite crystal morphologies in the presence of sodium stearate

Cited by 47 publications

References 25 publications

Synthesis of Calcium Carbonate by Semicontinuous Carbonation Method in the Presence of Dextrans

Synthesis of Calcium Carbonate by Semicontinuous Carbonation Method in the Presence of Dextrans

Fast precipitation of uniform CaCO3 nanospheres and their transformation to hollow hydroxyapatite nanospheres

Preparation of superhydrophobic nanocalcite crystals using Box–Behnken design

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