Tuning the growth morphology of gypsum crystals by polymers

Madeja, Benjamin; Avaro, Jonathan; Driessche, Alexander E. S. Van; Rückel, Markus; Wagner, Elisabeth; Cölfen, Helmut; Kellermeier, Matthias

doi:10.1016/j.cemconres.2022.107049

Cited by 17 publications

(7 citation statements)

References 40 publications

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“…In this work, irregular plate-like CaSO 4 •2H 2 O particles were observed by using an ionic ratio between Ca 2+ (hen or duck eggshell CaCO 3 ) and SO 42− (H 2 SO 4 ) of 1 (as described in "Materials and their Synthesis", Equations ( 1) and ( 2)) without an additive addition step. These results demonstrate that different formation conditions cause different morphological characteristics [56,57].…”

Section: Morphological Characteristicsmentioning

confidence: 61%

“…Moreover, Madeja et al [57] also used commercial CaCl2•2H2O and Na2SO4 solutions to prepare CaSO4•2H2O using titration precipitation and then investigated the influences of various additives (small molecules, 2− salts of 0.56 mol/L was prepared as stock solutions and then those were employed to prepare growth solutions with five different Ca 2+ :SO 4 2− free-ion ratios of 2.5:18.8, 3.4:13.7, 6.9:6.8, 13.6:3.4, and 17.8:2.5, corresponding to the ionic ratios (r) of 0.13, 0.25, 1.01, 4.00, and 7.12, respectively. At low ionic ratios (r < 1, SO 4 2− -rich solutions), plate-like CaSO 4 •2H 2 O crystals were observed, whereas needle-like crystals were observed at an equal stoichiometry (r = 1) and at high ionic ratios (r < 1, Ca 2+ -rich solutions) [56]. Moreover, Madeja et al [57] also used commercial CaCl 2 •2H 2 O and Na 2 SO 4 solutions to prepare CaSO 4 •2H 2 O using titration precipitation and then investigated the influences of various additives (small molecules, homo-and co-polymers) on the morphological characteristics of CaSO 4 •2H 2 O.…”

Section: Morphological Characteristicsmentioning

confidence: 98%

“…This finding is not consistent with the results reported in the literature. Mbogoro et al [56] used commercial CaCl2•2H2O and Na2SO4 as Ca 2+ and SO4 2− sources, respectively, to form CaSO4•2H2O crystals. The same concentration of Ca 2+ and SO4 2− salts of 0.56 mol/L was prepared as stock solutions and then those were employed to prepare growth solutions with five different Ca 2+ :SO4 2− free-ion ratios of 2.5:18.8, 3.4:13.7, 6.9:6.8, 13.6:3.4, and 17.8:2.5, corresponding to the ionic ratios (r) of 0.13, 0.25, 1.01, 4.00, and 7.12, respectively.…”

Section: Morphological Characteristicsmentioning

confidence: 99%

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Sustainable Production and Physicochemical Characteristics of Calcium Sulfate Dihydrate Prepared from Waste Eggshells

Seesanong,

Seangarun,

Boonchom

et al. 2024

Crystals

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Gypsum products (calcium sulfate dihydrate, CaSO4·2H2O) were synthesized through an eco-friendly and low-cost process by two different renewable calcium carbonate sources (CaCO3), hen and duck eggshell wastes, with product yields obtained of 84.73 and 87.74%, respectively. The X-ray fluorescence results indicated that calcium oxide (CaO) and sulfur trioxide (SO3) are the major elemental components of CaSO4·2H2O prepared from both calcium sources. The Fourier transform infrared results confirmed the vibrational characteristics of SO42− and H2O functional groups in the chemical structure of the prepared samples. The X-ray diffraction patterns of CaSO4·2H2O prepared from both calcium sources confirmed the sample’s crystal structure as well as the chemical formula, after comparing them to the standard powder diffraction file. The crystallite sizes of CaSO4·2H2O products were calculated from the experimental diffraction peak through the Scherrer equation and found to be 19–20 nm. The positive preferential growth (Pg) value highlighted the excellent stability of the synthesized CaSO4·2H2O. The scanning electron microscopic results showed the agglomeration particles of hen- and duck-CaCO3 raw agents, whereas plate-like particles were observed for hen- and duck-CaSO4·2H2O products but the particle sizes were different.

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Section: Morphological Characteristicsmentioning

confidence: 61%

Section: Morphological Characteristicsmentioning

confidence: 98%

Section: Morphological Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

Sustainable Production and Physicochemical Characteristics of Calcium Sulfate Dihydrate Prepared from Waste Eggshells

Seesanong,

Seangarun,

Boonchom

et al. 2024

Crystals

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show abstract

“…Nonetheless, both the oligopeptide and the derived copolymer analogs represent two of the very few additive classes with selective effects during adsorption on gypsum and crystallization of calcium sulfate phases in reactive systems. [ 29 ]…”

Section: Resultsmentioning

confidence: 99%

Phage Display Screening as a Rational Approach to Design Additives for Selective Crystallization Control in Construction Systems

et al. 2023

Self Cite

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all the way from natural biomineralization [1] to industrial applications. [2] Steering the course and outcome of a crystallization process is key to the design and production of materials with specific desired properties. [3] A common concept to influence a crystallizing system is the use of soluble (macro)molecules as additives, which interact with the forming solid phase during its nucleation, growth and further ripening. [4] Obviously, any such effects require the additive to exhibit a reasonably strong affinity to bind to or adsorb on the surface of relevant species such as nucleated nanoparticles or growing crystal facets. This is all the more true for crystallization in multicomponent systems, where the ability to address certain surfaces/phases in a more or less selective manner represents both a major challenge and a long-standing goal. In this context, one prominent case is ordinary Portland cement, which comprises a number of different inorganic phases that simultaneously react with water to yield various hydration products providing the resulting concrete with the desired strength and durability. [3,5] The need for selective crystallization control can readily be illustrated in such systems by a simple example: inThe design of additives showing strong and selective interactions with certain target surfaces is key to crystallization control in applied reactive multicomponent systems. While suitable chemical motifs can be found through semiempirical trial-and-error procedures, bioinspired selection techniques offer a more rationally driven approach and explore a much larger space of possible combinations in a single assay. Here, phage display screening is used to characterize the surfaces of crystalline gypsum, a mineral of broad relevance for construction applications. Based on next-generation sequencing of phages enriched during the screening process, a triplet of amino acids, DYH, is identified as the main driver for adsorption on the mineral substrate. Furthermore, oligopeptides containing this motif prove to exert their influence in a strictly selective manner during the hydration of cement, where the sulfate reaction (initial setting) is strongly retarded while the silicate reaction (final hardening) remains unaffected. In the final step, these desired additive characteristics are successfully translated from the level of peptides to that of scalable synthetic copolymers. The approach described in this work demonstrates how modern biotechnological methods can be leveraged for the systematic development of efficient crystallization additives for materials science.

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“…Desulfurization (FGD) gypsum is a common solid waste which will harm the environment if there is a lot of shelving [1][2][3]. FGD gypsum may be highly utilized to boost economic advantages [2][3][4][5] and transform trash into treasure. Gypsum's application regions are constrained by FGD gypsum's high porosity, which has issues including poor water resistance and low mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of sodium methylsilicate on mechanical and water resistance of macro defect-free (MDF) gypsum

Zhao

Dong

et al. 2023

J. Phys.: Conf. Ser.

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Finding vicarious building materials for Portland cement and reducing the usage of cementitious materials is a key to reduce the carbon emission of cement production. Desulfurization (FGD) gypsum powder is a common solid waste which application is limited by its low mechanical strength and poor water resistance properties. This paper studies the effect of sodium methylsilicate on the mechanical performance and waterproofs of macro-defect free (MDF) gypsum involving pressurized processing. The compressive strength, flexural strength, water absorption rate, softening coefficient and water contact angle of the MDF gypsum are assessed. The results show that adding 1.6 wt% sodium methylsilicate achieves to the maximum strength of 7.5 MPa for flexural and 35.7 MPa for compressive, which increasing by 4.2% and 6.6% relative to the pure MDF gypsum, and increasing by 11.9 % and 138.0 % relative to traditional casting gypsum. With the increasing content of sodium methylsilicate, the waterproofs of MDF gypsum become better. When adding 1.6 wt% sodium methylsilicate, the water absorption rate, softening coefficient and water contact angle is 0.4 %, 0.78 and 93.5° for 2 h immersion, respectively. The pressurized production is recommended to prepare MDF gypsum.

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Tuning the growth morphology of gypsum crystals by polymers

Cited by 17 publications

References 40 publications

Sustainable Production and Physicochemical Characteristics of Calcium Sulfate Dihydrate Prepared from Waste Eggshells

Sustainable Production and Physicochemical Characteristics of Calcium Sulfate Dihydrate Prepared from Waste Eggshells

Phage Display Screening as a Rational Approach to Design Additives for Selective Crystallization Control in Construction Systems

Effect of sodium methylsilicate on mechanical and water resistance of macro defect-free (MDF) gypsum

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