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Romanova, I. V.; Farbun, I. A.; Aleksandrova, V. S.; Khainakov, Sergei A.

doi:10.1023/a:1026005118913

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…The widening of the interstitial phase after ultrafiltration can be attributed to the removal of hydrolysis products, leading to a net reduction of intrinsic electrolytes. HEDP as a chelating ligand is known to form a variety of monomeric to oligomeric complexes with zirconium 75–77 and presumably reacts with preexisting zirconium hydrolysis products in the interstitial space and possibly modifies or erodes the platelets’ rims via complex formation with exposed zirconium sites. Besides charge screening, the interaction of large, super-chaotropic reaction products with the ammonium counter ions may as well alter the platelets’ effective charge density (cf.…”

Section: Resultsmentioning

confidence: 99%

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Lin

Schmelter

Imanian

et al. 2019

Sci Rep

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Platelets of α-zirconium phosphate (α-ZrP) obtained from the reflux method in H3PO4 are successfully exfoliated into water via the intercalation of alkanol amines. With volume fractions greater than 0.02 they are stacked into tactoids of few layers with a repeat distance in the order of 10 nm. The tactoids align into nematic liquid crystalline phases with irregularly wide interstices of empty liquid. Colloidal processing involves the freeze-drying of such anisotropic fluids and the dispersion of the restacked tacoids into aqueous dispersions of colloidal polymer particles of largely varying size which occupy the otherwise empty liquid between the α-ZrP tactoids and induce piling of the tactoids into columns. Real-time SAXS on drying films and TEM of the obtained coatings demonstrate that the stacked α-ZrP platelets and the polymer particles comprising liquid dry separately without polymer intercalation, while the morphology of the obtained composites can be tuned primarily by the size of the polymer colloids. Concomitant α-ZrP hydrolysis in the exfoliation step is scrutinized as a function of amine basicity and temperature. The role of zirconium based hydrolysis products in the hierarchical α-ZrP assembly is indirectly though consistently confirmed by opposing impacts of ultra-filtration and added oxoanions on the platelets’ spacing, smoothness and aggregation. HAADF-TEM imaging of scattered, singular platelets and XRD peak analysis of the pristine solid shed light on the α-ZrP synthesis. Coexisting flakes and lacunae, both similar in size to the intra-layer crystal domains, suggest the stitching of proto-α-ZrP flakes into extended layers in accordance with our observations on the aging behaviour of α-ZrP dispersions as well as with literature data on related systems.

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Section: Resultsmentioning

confidence: 99%

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Lin

Schmelter

Imanian

et al. 2019

Sci Rep

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“…Among a number of materials, hydrated mixed oxides of group-II-IV metals, especially Ti, Fe and Al, synthesized by the most popular method of co-precipitation are suggested for removal of phosphorus and arsenic compounds [10][11][12][13]. It is well known that physico-chemical properties of functional materials largely depend on the synthesis conditions [14][15][16]. For example, the main advantage of sol-gel method that also is widely used for obtaining the various composites is the possibility to control the textural and surface properties of target materials.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the main advantage of sol-gel method that also is widely used for obtaining the various composites is the possibility to control the textural and surface properties of target materials. According to the studies published early, adding the reagents on the stage of mixing solutions could significantly change the morphology and sorption properties of final products [14].…”

Section: Introductionmentioning

confidence: 99%

Фізико-Хімічні Властивості Матеріалів На Основі Гідроксидів Титану Допованих Церієм Та Залізом Синтезованих Двома Методами

Тарновський¹,

Циба²,

Кузнецова

et al. 2021

J. of Chem. and Tech.

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Матеріали на основі гідроксиду титану синтезовано методами співосадження та золь-гель технології з використанням аналітичних та технологічних розчинів. Співвідношення металів у зразках після термічної обробки визначалось методом рентгено-флуоресцентного аналізу. Морфологію одержаних композитів досліджено методом низькотемпературної адсорбції/десорбції азоту. Процес сорбції фосфат-іонів, які визнані одними з основних забруднювачів води, вивчено на індивідуальних зразках гідроксидів титану та композитах, до складу яких входять також оксиди заліза та церію, у широкому діапазоні рН розчинів. Всі досліджені зразки виявили максимальну здатність до вилучення сорбованих іонів при рН=2. Композит на основі гідратованих оксидів титану, заліза та церію, синтезований золь-гель методом, має максимальну адсорбційну ємність, що складає 3.6 ммоль/г. Для математичної обробки ізотерм адсорбції використано теоретичні моделі Ленгмюра, Фрейндліха та Тьомкіна. Виявилось, що модель Ленгмюра найкраще підходить для обробки ізотерм, одержаних на індивідуальних зразках гідроксиду титану. Модель Тьомкіна можна використовувати для обробки всіх експериментальних ізотерм, незалежно від складу композитів та методу, застосованого для їх синтезу.

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“…Products were claimed for the cleansing, polishing and pretreatment of metals as well as their application in adhesives, personal care products, pharmaceuticals, construction materials, fracturing fluids and dental implants. Furthermore, reaction products from zirconyl chloride with HEDP have been proposed as sorbents, 2 ion exchangers, 3,4 catalysts, [5][6][7] proton conductors 8 and recently as corrosion inhibitors for magnesium. 9 The complexation of zirconium from ZrOCl 2 with HEDP has been studied by Romanova et al by using titration and pH.…”

Section: Introductionmentioning

confidence: 99%

Giant zirconium-bisphosphonate nano-ribbons and their liquid crystalline phase behaviour in water

et al. 2021

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Untitled

Cited by 7 publications

References 2 publications

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Фізико-Хімічні Властивості Матеріалів На Основі Гідроксидів Титану Допованих Церієм Та Залізом Синтезованих Двома Методами

Giant zirconium-bisphosphonate nano-ribbons and their liquid crystalline phase behaviour in water

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