Size control and structure features of spherical calcium carbonate particles

Trushina, Daria B.; Sulyanov, S. N.; Букреева, Т. В.; Kovalchuk, M. V.

doi:10.1134/s1063774515040227

Cited by 33 publications

(36 citation statements)

References 30 publications

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“…Another interesting note is that, for the calcium containing silica feed (Si+Ca), some spherical foulant formation was observed on the top of membrane surface in DCMD, this formation is specific to DCMD as it was not present on membrane surfaces in VMD and SGMD configurations. The spherical foulant (Figures 5b, 5c and 5d) was calcium carbonate as suggested by others (Trushina et al 2015, Yu et al 2004. It can be seen from Figure 2(b) that a flux decline in DCMD occurred at about 22-24% recovery, which was caused by the supersaturated calcium carbonate precipitating from the bulk feed and forming a calcium carbonate layer on top of the silica fouling layer.…”

Section: Surface Morphology Of the Fouled Membranesupporting

confidence: 56%

Comparison of colloidal silica involved fouling behavior in three membrane distillation configurations using PTFE membrane

Qin

Xie

et al. 2018

Water Research

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Colloidal silica involved fouling behaviors in direct contact membrane distillation (DCMD), vacuum membrane distillation (VMD) and sweeping gas membrane distillation (SGMD) were studied. Three foulants were used in the experiments, including colloidal silica as representative of particulate foulants, calcium bicarbonate as dissolved inorganic foulant, and NOM (humic acid + alginate + BSA) as the dissolved organic foulant. The three types of fouants were combined to produce four different feed waters: silica alone; silica + calcium bicarbonate; silica + NOM; and silica + calcium bicarbonate + NOM. With 25% feed recovery, it was found that VMD showed the worst performance for most of the foulant combinations due to turbulence dead zones caused by the membrane deformation that increased foulant deposition. For the silica + calcium bicarbonate + NOM feed DCMD had the greatest fouling rate, although DCMD also had the highest flux of all configurations. SGMD showed the best fouling resistance of all configurations, although it was inclined to calcium carbonate fouling because carbon dioxide was removed in the permeate leading to calcium carbonate precipitation and could be alleviated by using air as sweeping gas. For feeds containing high-concentration calcium bicarbonate or carbonate foulants, VMD should be avoided to lower the formation of carbonate precipitants on the membrane surface if scale inhibitors are not used.

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Section: Surface Morphology Of the Fouled Membranesupporting

confidence: 56%

Comparison of colloidal silica involved fouling behavior in three membrane distillation configurations using PTFE membrane

Qin

Xie

et al. 2018

Water Research

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“…Briefly, spherical vaterite crystals comprise of small nanocrystallines interconnected to each other forming mesoporous structure of the crystal. The use of organic additives [79], some protein/polymer matrices [80] or nanoparticles [81] can direct the growth of vaterite crystals of specific shape and morphology. The porosity of the crystals can also be controlled, e.g.…”

Section: Caco3 Vaterite Crystals: Loading and Release Opportunitiesmentioning

confidence: 99%

“…via the variation of crystal preparation temperature [82]. The typical sizes of crystals range from 3 to 20 µm, although a number of recent studies proposed novel ways for the fabrication of nano-crystals [79,80,83] or large vaterite of sizes in sub-millimeter range [84].…”

Section: Caco3 Vaterite Crystals: Loading and Release Opportunitiesmentioning

confidence: 99%

Porous Alginate Scaffolds Assembled Using Vaterite CaCO3 Crystals

2019

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Formulation of multifunctional biopolymer-based scaffolds is one of the major focuses in modern tissue engineering and regenerative medicine. Besides proper mechanical/chemical properties, an ideal scaffold should: (i) possess a well-tuned porous internal structure for cell seeding/growth and (ii) host bioactive molecules to be protected against biodegradation and presented to cells when required. Alginate hydrogels were extensively developed to serve as scaffolds, and recent advances in the hydrogel formulation demonstrate their applicability as “ideal” soft scaffolds. This review focuses on advanced porous alginate scaffolds (PAS) fabricated using hard templating on vaterite CaCO3 crystals. These novel tailor-made soft structures can be prepared at physiologically relevant conditions offering a high level of control over their internal structure and high performance for loading/release of bioactive macromolecules. The novel approach to assemble PAS is compared with traditional methods used for fabrication of porous alginate hydrogels. Finally, future perspectives and applications of PAS for advanced cell culture, tissue engineering, and drug testing are discussed.

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“…VCC crystals have typical dimensions ranging from 3 to 20 mm and most often have a spherical shape. A number of recent studies have also proposed novel ways for the fabrication of VCC nanocrystals [72][73][74] indispensable for drug delivery applications. The shape and morphology of these crystals may be tuned over a wide range using organic solvents 73 or mild water-urea mixed systems, 75 polymer matrices and proteins 74 or nanoparticles.…”

Section: Caco 3 and Its Polymorphsmentioning

confidence: 99%