The influence of polyelectrolytes architecture on calcium sulfate dihydrate growth retardation

Öner, Mualla; Doğan, Özlem; Öner, Gülek

doi:10.1016/s0022-0248(97)00518-6

Cited by 110 publications

(62 citation statements)

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“…These tubes (Admiralty brass (AB), stainless steel 304, SS) were suspended from the lid of the crystallization cell and immersed in the supersaturated solution. The total metal surface area in contact with the calcium sulfate solution was typically about 81 cm 2 . The tubes were chemically cleaned and rinsed thoroughly with distilled water to avoid any surface imperfections and impurities.…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, considerable attention has been given to the various forms of calcium sulfate crystallizing from aqueous solution as affected by temperature, pH, solution stoichiometric ratio of lattice ions, and impurity level [1][2][3]. These and other important factors involved in the nucleation and growth of calcium sulfate dihydrate (CaSO 4 ·2H 2 O, gypsum), hemihydrate (CaSO 4 ·½H 2 O, plaster of Paris), and anhydrite (CaSO 4 ) should have direct application to the control and inhibition of scale formation.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic and morphological investigation of calcium sulfate dihydrate (gypsum) scale formation on heat exchanger surfaces in the presence of inhibitors

Amjad

2017

Int. J. Corros. Scale Inhib.

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The kinetics of calcium sulfate dihydrate (CaSO 4 ·2H 2 O, gypsum) scale formation on heated metal surface from aqueous solution has been studied by a highly reproducible technique. It has been observed that gypsum growth takes place directly on heated metal surface without any bulk or spontaneous precipitation in the supersaturated solution. A variety of maleic acid based polymers with different functional groups have been examined for their inhibitory effect on gypsum growth. The results indicate that amount of gypsum scale formed on heated metal surface is strongly affected by polymer dosage and the functional groups present in the polymer. Scanning electron microscopic investigations of the gypsum crystals grown in the presence of anionic polymeric additives show that structures of these crystals are highly modified. Results on the performance of various surfactants and biocides are presented.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic and morphological investigation of calcium sulfate dihydrate (gypsum) scale formation on heat exchanger surfaces in the presence of inhibitors

Amjad

2017

Int. J. Corros. Scale Inhib.

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“…13), 14) The purpose of this investigation was to study the selective effect of carboxymethylinulin (CMI, Fig. 1) on the crystallization kinetics of HAP.…”

Section: )7)mentioning

confidence: 99%

The inhibitory effects of inulin biopolymers on the seeded growth of hydroxyapatite

Doğan

Öner

Cinel

2010

J. Ceram. Soc. Japan

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In this work crystallization kinetics of hydroxyapatite (HAP) were investigated in the presence of a biodegradable, environmentally friendly polysaccharide-based polycarboxylate, carboxymethyl inulin (CMI), under strictly controlled temperature, pH, and atmospheric conditions. The constant-composition method has been used to study the influence of biopolymers of crystal growth of HAP, on HAP seed crystals at pH 7.4 and 37°C. The results indicate that polymer concentration and the larger number of negatively charged functional groups markedly affect the growth rate. Biopolymer affects the coherence length of the crystalline domain. The decrease in growth rates was substantiated by SEM which showed smaller crystal sizes as a function of increasing carboxylation degree of the CMI and its concentration.

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“…Les polyphosphates et les polyacrylates sont les familles de tartrifuges généralement utilisées à cause de leur susceptibilité à former des liaisons avec les cations (Ca 2+ ) [4][5][6][7]. Ceci leur permet d'être efficace même à faible dose.…”

Section: Introductionunclassified

“…Ils ont montré que ces inhibiteurs ralentissent la vitesse de précipitation à partir de solution sursaturée en sulfate de calcium et augmentent le temps de germination. Öner [5] a étudié l'effet de quelques polyélectrolytes. Il a trouvé que les acrylates étaient plus efficace que les méthacrylates.…”

Section: Introductionunclassified

Étude de l’effet d’un polyacrylate et d’un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium

et al. 2004

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Abstract. The retarding influence of polyacrylate and polyphosphate on the nucleation of calcium sulphate was investigated. SEM analyses show that these inhibitors didn't only influence the nucleation kinetics but also the precipitate morphology by adsorption onto crystal growth sites. The influence of different concentrations of the additives on the mineralogy of solid precipitated was also examined. Spectroscopy Raman analyses showed that the calcium sulphate can precipitate under different phases, gypsum (CaSO 4 .2H 2 O), hemihydrate (CaSO 4 .1/2H 2 O) and / or anhydride (CaSO 4 ), as function of inhibitors concentrations.

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The influence of polyelectrolytes architecture on calcium sulfate dihydrate growth retardation

Cited by 110 publications

References 0 publications

Kinetic and morphological investigation of calcium sulfate dihydrate (gypsum) scale formation on heat exchanger surfaces in the presence of inhibitors

Kinetic and morphological investigation of calcium sulfate dihydrate (gypsum) scale formation on heat exchanger surfaces in the presence of inhibitors

The inhibitory effects of inulin biopolymers on the seeded growth of hydroxyapatite

Étude de l’effet d’un polyacrylate et d’un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium

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