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Calcium sulfate and calcium vanadate nanostructures have been synthesized by a hydrothermal route using calcium sulfate and sodium vanadate as the raw materials.
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Calcium sulphate (CaSO 4), one of biomaterial with high potential for dental and orthopedic applications due to its similarity to the mineral constituents of bone in the human body.Three polymorphic forms of anhydrous CaSO 4 exist, namely III-CaSO 4, II-CaSO 4 and I-CaSO 4, which existed in ascending order of temperatures.II-CaSO 4 is known as the most …
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Question 2 4 pts Using the Instructional Video and Study Guide as a pattern, from the data provided, complete the table, reporting the calculated theoretical yield for the synthesis of calcium sulfate dihydrate. Identify the limiting reactant and calculate percent yield. Remember to show your work (calculations: 3 points, answer: 1 point.)
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For this purpose, pure β-C 2 S was synthesized at 1200 °C via the Pechini method. The synthesis method and calcination condition are chosen to attain lime-free C 2 S. To study the effect of anions on β-C 2 S activation, the molarity of sodium ion is fixed to 0.8 M to have comparable Na + concentration in all samples. The effect of dissolution degree on the β-C 2 S …
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In this work, snowflake-like α-CaSO 4 ·0.5H 2 O (α-CSH) hierarchical architectures were successfully synthesized by a facile one-pot method in an ethylene glycol-water system using Na 2 EDTA as a crystal morphology modifier. Characterization techniques including X-ray diffraction (XRD), thermogravimetric (TG) analysis, differential scanning calorimetry (DSC), …
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In the absence of calcium sulfate, C 4 A 3 Ŝ reacts with water forming monosulfoaluminate (C 3 A·CŜ·12H; C 4 AŜH 12) (Winnefeld and Lothenbach, 2010). The formations of these two hydrates contribute different strength development with larger contribution from ettringite than from monosulfoaluminate (Kaprálik and Hanic, 1989, Mehta and ...
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The process flowsheet is given in Fig. 5 [71]. CaSO 4 · 2H 2 O ⇔ Ca 2+ + SO 4 2-+ 2H 2 O Ca 2+ + SO 4 2-+ 0.5H 2 O ⇔ CaSO 4 ·0.5H 2 O. Download: Download high-res image (60KB) ... An optimal stirring rate for the synthesis of calcium sulfate whiskers is in the range of 300–600 rpm. This range allows for adequate mixing of reactants ...
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Nanosized insoluble metal sulfate aggregates, predominantly CaSO4, have been prepared in a variety of water-in-oil (w/o) microemulsions stabilized by either nonionic or ionic surfactants. Particles were visualized by transmission electron microscopy (TEM) and the identities of the aggregates confirmed by energy-dispersive X-ray analysis (EDXA). BaSO4 …
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The synthesis of calcium sulfate beads requires precision to achieve desired characteristics for specific medical applications. The initial step involves preparing a …
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Figure 1 revealed that the optimum dosage of limestone waste required to synthesize calcium sulphate is 2.0 g while the concentration of sulphuric acid required was found to be. 0.2 M as …
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Preparing calcium sulfate whisker (CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and …
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Calcium sulphate (CaSO 4), one of biomaterial with high potential for dental and orthopedic applications due to its similarity to the mineral constituents of bone in the human …
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3D hierarchical flower-like calcium sulfate microspheres (CSMs) were prepared by a simple one-pot method with CaCl 2 and Na 2 SO 4 as the raw materials. Crystal shape guides leading to …
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We report a new class of glycerol–water system to transform FGD gypsum into α-calcium sulfate hemihydrate (α-HH) mediated by trace NaCl and Na2EDTA to regulate the phase transformation rate as well as the crystal morphology to achieve crystals with high mechanical strength. NaCl plays a role in accelerating the nucleation and crystal growth …
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An additive is not exclusively retardant or promoter for a crystallization system. The kinetic studies of calcium sulfate dihydrate (CSD) crystal growth demonstrated that borax played dual roles in the reaction, which accelerated CSD formations at the low concentration levels but inhibited the crystal growth at the high ones. In situ atomic force microscopy studies …
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Synthesis of Calcium Sulphate from Limestone Waste Collected From ...
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Study with Quizlet and memorize flashcards containing terms like order the steps required to predict the volume (in mL) of 0.100 M calcium chloride needed to produce 1.00 g of calcium carbonate. There is an excess of sodium carbonate., calculate the volume (in mL) of 0.100 M CaCl2 needed to produce 1.00 g of CaCO3(s), lab data and more.
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The most optimum processing parameters for pure II-CaSO4 powder formation is calcined at 500 °C, and the FESEM observation shows that increasing calcination temperatures will contribute to the change of morphology of the CaSO4 Powder as well as its particle size due to necking effect. Calcium sulphate (CaSO4), one of biomaterial with high potential for dental …
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Synthesis of α-calcium sulfate hemihydrate. The synthesis was carried out in a 500 ml three-neck flask equipped with a glass condenser, a thermometer and a Teflon impeller …
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synthesis methods were used for the conv ersion of phos- phogypsum to ammonium sulfate and calcium carbonate: (i) Tw o-step method: it consists of reacting ammonia
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Although the preparation of calcium sulfate whiskers using salt gypsum is a valuable concept, the use of untreated salt gypsum—which contains numerous impurity ions (such as Na +, Mg 2+, and K +)—has a considerable impact on the morphologies of the resulting calcium sulfate whiskers, leading to unstable whisker quality [5].
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Synthesis, Dehydration, and Rehydration of Calcium Sulfate (Gypsum, Plaster of Paris) Sirokman, Gergely; Abstract. Publication: Journal of Chemical Education. Pub Date: April 2014 DOI: 10.1021/ed400004b Bibcode: 2014JChEd..91..557S full text sources. Publisher ...
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Direct preparation of α-calcium sulfate hemihydrate out of sulfuric acid solution by reaction with lime under atmospheric pressure conditions is systematically investigated.
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In the absence of calcium sulfate, C 4 A 3 Ŝ reacts with water and forms monosulfate (C 3 A.CŜ.12H; C 4 AŜH 12) [18]. Calcium sulfates can either be in a form of anhydrite (CaSO 4; CŜ) in the synthesized cement or gypsum (CaSO 4 ·2H 2 O; CŜH 2) interground with clinker after calcination or the combination of the two.
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Calcium phosphate/calcium sulphate powders were synthesized by wet method. The effects of the initial calcium/phosphorus molar ratio and the pH of the solution on the microstructure and phase ...
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As a byproduct of the industrial synthesis of phosphoric acid, there was a large quantity of phosphor gypsum (PG) accumulation, which needs enormous storage space and endangers the environment. The preparation of calcium sulfate whisker (CSW) from waste PG could solve the large amounts of PG accumul …
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CaCl 2 solution of desired concentration was prepared using water as a solvent. The natural rheology modifier was then added into the solution. Temperature of the solution was maintained as per the requirement. Sulphuric acid was added slowly at the vortex of CaCl 2 solution under fixed agitation. Stoichiometric amount of sulphuric acid was added for the …
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Herein, calcium sulfate has been successfully synthesized through a room-temperature microemulsion method. During the synthesis of nanosized calcium sulfate, three …
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Engaging students who are not chemistry majors is a significant challenge. Plaster of Paris is a substance well-known to undergraduate students from early life arts-and-crafts endeavors. Within, a lab is described that connects the synthesis and use of plaster of Paris with a number of chemical principles including stoichiometry, acid–base titration, hydration, and …
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