Influence of impurity ions and magnetic field on the properties of freshly precipitated calcium carbonate

Hołysz, Lucyna; Chibowski, Emil; Szcześ, Aleksandra

doi:10.1016/s0043-1354(03)00159-3

Cited by 41 publications

(34 citation statements)

References 20 publications

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“…This was mostly due to the absence of any plausible mechanism that could explain the lasting effect of magnetic fields even after the exposure itself had ceased. Over the past 40 years a lot of research has been done on the effects of magnetic or electromagnetic treatment on water, and over a hundred articles and reports are available in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Most of these papers deal with calcium carbonate precipitation, a few report on biological effects.…”

Section: Magnetic Water Treatmentmentioning

confidence: 99%

Strong Gradients in Weak Magnetic Fields Induce DOLLOP Formation in Tap Water

Sammer¹,

Kamp²,

Paulitsch-Fuchs³

et al. 2016

Water

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Abstract:In 2012 Coey proposed a theory on the mechanism of magnetic water treatment based on the gradient of the applied field rather than its absolute strength. We tested this theory by measuring the effect of very weak field magnets (ď 10 G) containing strong magnetic inhomogeneities (∆B = 2 kG¨m´1) on tap water samples by the use of electric impedance spectroscopy (EIS) and laser scattering. Our results show an increased formation of nm-sized prenucleation clusters (dynamically ordered liquid like oxyanion polymers or "DOLLOPs") due to the exposure to the magnetic field and thus are consistent with Coey's theory which is therefore also applicable to very weak magnetic fields as long as they contain strong gradients.

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Section: Magnetic Water Treatmentmentioning

confidence: 99%

Strong Gradients in Weak Magnetic Fields Induce DOLLOP Formation in Tap Water

Sammer¹,

Kamp²,

Paulitsch-Fuchs³

et al. 2016

Water

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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%

“…It is the reason why newly formed particles were aggregated and formed micron sized particles [3,9,[23][24][25][26][27]. It was understood that the surface potential for CaCO 3 is affected by various parameters such as aging [22], additives [28], surface modifiers [11], and ions [12,14]. For instance, the zeta potential for CaCO 3 was positive when Ca þ þ ions were in excess in the solution, and it was negative when highly important for the production of stable nano-CaCO 3 particles.…”

Section: Introductionmentioning

confidence: 99%

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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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“…It has been demonstrated in recent years that magnetic fields influence the physicochemical properties of water and aqueous solutions and suspensions [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Different hypotheses for the influence of magnetic fields on water and aqueous solutions have been extensively studied [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of A Magnetic Field on Pb(II) Removal Using Modified Chitosan

Duan¹,

Guo²,

Yang³

2012

ACES

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This work examined the removal of Pb(II) using a chitosan derivative (SB, synthesized from benzaldehyde) assisted by a magnetic field. The adsorption capacity for Pb(II) was investigated. It was found that 1) the pH and concentration of the ion solution, as well as exposure time and strength of magnetic field, affected the degree of adsorption; and 2) studies of the adsorption isotherms and kinetics of ions onto SB revealed that SB showed enhanced adsorption capacity towards Pb(II) ions in a magnetic field compared with magnetically untreated samples. The Langmuir and Freundlich isotherm were applied to describe the experimental adsorption, and the maximum adsorption capacity of SB for Pb(II) was 2.5040 mg/g, when assisted by a magnetic field of 480 kA/m.

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Influence of impurity ions and magnetic field on the properties of freshly precipitated calcium carbonate

Cited by 41 publications

References 20 publications

Strong Gradients in Weak Magnetic Fields Induce DOLLOP Formation in Tap Water

Strong Gradients in Weak Magnetic Fields Induce DOLLOP Formation in Tap Water

Rice-like hollow nano-CaCO 3 synthesis

Study on the Effect of A Magnetic Field on Pb(II) Removal Using Modified Chitosan

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