Effect of Poly(acrylic acid-co-N-vinylpyrrolidone) on Calcium Oxalate Crystallization

Georgiev, Georgi V.; Djarova, M.; Petkova, Julia I; Georgiev, George I; Koseva, Nely S.

doi:10.1295/polymj.27.441

Cited by 8 publications

(8 citation statements)

References 7 publications

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“…At 25 ˚C, the calculated value of surface tension between COM and deionized water was 7.14 mJ/m 2 . Generally, the surface energy for more soluble salts is less than that of the less or sparingly soluble salts [21]. Table 2 and Figs.…”

Section: Correlation Between Supersaturation Ratio and Induction Timementioning

confidence: 96%

A study of primary nucleation of calcium oxalate monohydrate: I‐Effect of supersaturation

El‐Shall¹,

Jeon²,

Abdel-Aal

et al. 2004

Cryst. Res. Technol.

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There are various organic and inorganic constituents in kidney stones. Among them, calcium oxalate monohydrate (COM) is the primary inorganic constituent of kidney stones. However, the mechanisms of formation of kidney stones are not well understood. In this regard, a basic study is carried out for better understanding of nucleation, crystal growth and/or aggregation of formed COM crystals. The primary nucleation of calcium oxalate monohydrate is studied at the laboratory scale using turbidity measurements. Calcium chloride and potassium oxalate solutions are mixed and then added to a Turbidimeter tube for continuous recording of turbidity. Induction time (time to induce formation of detectable crystals) is estimated from time-turbidity graphs. The effect of some urinary species, such as oxalate and calcium, on nucleation and crystallization characteristics of COM is determined by particle size distribution analysis, measuring weight of crystals and calculation of relative supersaturation. The classical nucleation theory is applied at high supersaturation ratios (SR) ranging from 1.6 to 2.2. The results indicate that nucleation rate increases with increasing supersaturation ratio from 0.81 x 10 28 nuclei/cm 3 .sec at 1.6 SR, to 18.02 x 10 28 nuclei/cm 3 .sec at 2.2 SR. On the other hand, free energy change and radius of critical nucleus are decreased as supersaturation ratio is increased. The nucleation rates are higher than those reported in literature. Such discrepancy is discussed on the bases of differences in experimental techniques.

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Section: Correlation Between Supersaturation Ratio and Induction Timementioning

confidence: 96%

A study of primary nucleation of calcium oxalate monohydrate: I‐Effect of supersaturation

El‐Shall¹,

Jeon²,

Abdel-Aal

et al. 2004

Cryst. Res. Technol.

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show abstract

“…The t ind was calculated as described above and the crystal growth efficiency (G.E.) after a surfactant was added was calculated from values of the t ind in the absence of a surfactant (T 0 ) and in the presence of a surfactant (T 1 ) as follows [18,19]:…”

Section: Determination Of the Induction Time And Growth Efficiencymentioning

confidence: 99%

Crystal modification of calcium sulfate dihydrate in the presence of some surface-active agents

Mahmoud

Rashad

Ibrahim

et al. 2004

Journal of Colloid and Interface Science

116

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“…Calculation of growth efficiency (E) Growth efficiency (E) is calculated by the following relation [17]:…”

Section: Methodsmentioning

confidence: 99%

Effect of cetyl pyridinium chloride additive on crystallization of gypsum in phosphoric and sulfuric acids medium

El‐Shall¹,

Rashad²,

Abdel-Aal³

2005

Cryst. Res. Technol.

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A basic study was carried out to understand effect of Cetyl Pyridinium Cloride (CPC) on calcium sulfate dihydrate (gypsum) crystallization. Induction time was measured under different supersaturation ratios ranging from 1.222 to 1.979. This is the time elapsed between the achievement of supersaturation and the appearance of a solid phase. The results show that, the induction time decreases exponentially with increasing the supersaturation ratio. In addition, the surface energy increases with CPC compared to the baseline (without CPC). Number of molecules required for formation of stable nucleus are calculated to be from 3 to 41 molecules depending on supersaturation ratios and presence of CPC. Interestingly, with addition of the CPC, the mean diameter of the crystals and the median increase. The growth rate was found dependent on the supersaturation with and without CPC.

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Effect of Poly(acrylic acid-co-N-vinylpyrrolidone) on Calcium Oxalate Crystallization

Cited by 8 publications

References 7 publications

A study of primary nucleation of calcium oxalate monohydrate: I‐Effect of supersaturation

A study of primary nucleation of calcium oxalate monohydrate: I‐Effect of supersaturation

Crystal modification of calcium sulfate dihydrate in the presence of some surface-active agents

Effect of cetyl pyridinium chloride additive on crystallization of gypsum in phosphoric and sulfuric acids medium

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