One-step synthesis of basic magnesium sulfate whiskers by atmospheric pressure reflux

Ma, Xinlong; Gao, Ning; Qi, Chuanlei; Gao, Jinsen

doi:10.1016/j.partic.2015.03.004

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…In this study, MgSO4 5Mg(OH)2 2H2O (MHSH) whiskers, a novel microfibrous material, were used to improve the mechanical properties of M-S-H cement mortars. MHSH whiskers are inorganic single crystals with a pH of 9-9.5 [21], which is similar to the pH of M-S-H cement, suggesting that MHSH whiskers will have a good compatibility with M-S-H cement. This study aimed to improve the shrinkage and investigate and enhance the mechanical properties and toughness of MHSH whisker-reinforced M-S-H cement composites.…”

Section: Introductionmentioning

confidence: 90%

A novel magnesium hydroxide sulfate hydrate whisker-reinforced magnesium silicate hydrate composites

Zhang

Zhou

et al. 2020

Composites Part B: Engineering

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Section: Introductionmentioning

confidence: 90%

A novel magnesium hydroxide sulfate hydrate whisker-reinforced magnesium silicate hydrate composites

Zhang

Zhou

et al. 2020

Composites Part B: Engineering

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“…In the non-bu ered solution system, in order to make the crystal orientation regular growth, it is necessary to eliminate the di erence of OH − concentration and overcome the adverse solution change. erefore, some measures should be taken to strengthen the di usion of molecules, such as increasing the temperature to reduce the non-ideality of the growth process; Adding some morphological modi ers to limit non-directional growth; And the liquid phase di usion is enhanced by vigorous stirring (Ma et al, 2016), ultrasonic waves and microwaves. But at the same time the preparation cost is also increased.…”

Section: Growth Mechanism Of Basic Magnesium Sulfatementioning

confidence: 99%

Study on Preparation and Growth Mechanism of MgSO4·5Mg(OH)2·3H2O Whiskers in NH4+–NH3 Buffer System

Fan

Han

Jia

et al. 2020

J. Chem. Eng. Japan / JCEJ

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Magnesium hydroxide Sulfate hydrate (MHSH) whiskers are synthetic inorganic functional materials with certain aspect ratio. The formula is xMgSO 4 •yMg(OH) 2 •zH 2 O. In the NH 4-NH 3 bu er system, MgSO 4 •5Mg(OH) 2 •3H 2 O with a length of 10-30 µm, a diameter of 0.05-0.3 µm and an aspect ratio of 30-150 are prepared by one step at atmospheric pressure for a short time. The products are characterized by XRD, SEM, TG, TEM, etc. The in uence factors such as reaction concentration, reaction temperature, reaction time and aging time are studied by combining the characterization results. First-principles analysis of the growth mechanism of MHSH whiskers show that growth habits accord with the dislocation spiral growth mechanism. The bu er system stabilizes the acidity and basicity of the solution, reduces the non-ideality of the solution, and enables the crystals to grow directionally under non-forced conditions, which provides an important reference for further industrial application and low-energy consumption production of MHSH whiskers.

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Section: Preparing Mhsh Whiskers From Acidic Leachatementioning

confidence: 99%

“…At high temperatures, the Mg(OH) 2 precursor dissolved and underwent hydrolysis to produce Mg (OH) 6 4− (Equation (11)). Then the reaction of Mg(OH) 6 4− with SO 4 2− of the solution resulted in MHSH (Equation (12)). Due to the low solubility of Mg(OH) 2 , an excess amount of MgSO 4 was necessary for the growth of whiskers.…”

Section: Preparing Mhsh Whiskers From Acidic Leachatementioning

confidence: 99%

“…[1,2]. MHSH whiskers are important inorganic materials [3,4], with various distinctive properties including low toxicity, high corrosion resistance, low density, high thermal stability and high elastic modulus [5][6][7][8][9], which have been widely used as resin additives of flame retardant for polymers, fillers, reinforcing agent, and acidic waste neutralizer for environmental protection, etc. [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Utilization of the MgO-Rich Residue Originated from Ludwigite Ore: Hydrothermal Synthesis of MHSH Whiskers

Zhang

et al. 2017

Minerals

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Abstract:In this work, from the MgO-enriched residue originated from ludwigite ore, value-added magnesium hydroxide sulfate hydrate (MHSH) whiskers were prepared via sulfuric acid leaching and leachate purification, followed by hydrothermal synthesis. During sulfuric acid leaching, 98.2% magnesium and 99.6% silica were removed under the optimal leaching conditions: sulfuric acid concentration of 40%, leaching temperature of 80 • C, leaching time of 90 min, and liquid to solid ratio of 4 mL/g. After purification of the acidic leachate via oxidation and precipitation to remove impurities including iron and aluminum, the Mg 2+ -rich solution was used to prepare magnesium hydroxide sulfate hydrate whiskers (5Mg(OH) 2 ·MgSO 4 ·2H 2 O, abbreviated as 512MHSH) via hydrothermal synthesis. Finally, 512MHSH whiskers were obtained with 30-100 µm in length, 0.5-1.0 µm in diameter and aspect ratio of approximately 100. The physicochemical characteristics of whiskers were further characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), Fourier Transform Infrared Spectroscopy (FT-IR) and Thermogravimetry-Differential Scanning Calorimetry (TG-DSC).

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One-step synthesis of basic magnesium sulfate whiskers by atmospheric pressure reflux

Cited by 12 publications

References 20 publications

A novel magnesium hydroxide sulfate hydrate whisker-reinforced magnesium silicate hydrate composites

A novel magnesium hydroxide sulfate hydrate whisker-reinforced magnesium silicate hydrate composites

Study on Preparation and Growth Mechanism of MgSO<sub>4</sub>·5Mg(OH)<sub>2</sub>·3H<sub>2</sub>O Whiskers in NH<sub>4</sub><sup>+</sup>–NH<sub>3</sub> Buffer System

Utilization of the MgO-Rich Residue Originated from Ludwigite Ore: Hydrothermal Synthesis of MHSH Whiskers

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