Hydrothermal Formation Of Hemi-hydrate Calcium Sulfate Whiskers In The Presence Of Additives

Journal Article · Wed Nov 24 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3529304· OSTI ID:21506738

Luo, K B ^[1]; Li, C M; Li, H P; Ning, P ^[1]; Xiang, L ^[2]

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1. Department of Chemical Engineering, Kunming University of Science and Technology, Kunming 650224 (China)
2. Department of Chemical Engineering, Tsinghua University, Beijing 100084 (China)

The influence of addictives on the hydrothermal formation of hemi-hydrate calcium sulfate (CaSO{sub 4{center_dot}}0.5H{sub 2}O) whiskers were discussed in this paper, using CaCl{sub 2} and Na{sub 2}SO{sub 4} as the reactants. The presence of NaCl, CaCl{sub 2} or Na{sub 2}SO{sub 4} increased the concentrations of Ca{sup 2+} and SO{sub 4}{sup 2-}, leading to the formation of CaSO{sub 4{center_dot}}0.5H{sub 2}O whiskers with aspect ratio lower than 50. The one dimensional growth of CaSO{sub 4{center_dot}}0.5H{sub 2}O whiskers was enhanced in water with no additives owing to the low super-saturation, leading to the formation of uniform whiskers with a length of 200-2000 {mu}m and an aspect ratio higher than 100.

• OSTI ID: 21506738
• Journal Information: AIP Conference Proceedings, Vol. 1251, Issue 1; Conference: 2. international symposium on aqua science, water resource and low carbon energy, Sanya Hainan (China), 7-10 Dec 2009; Other Information: DOI: 10.1063/1.3529304; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADDITIVES
ASPECT RATIO
CALCIUM CHLORIDES
CALCIUM IONS
CALCIUM SULFATES
COMPOSITE MATERIALS
CRYSTALS
HYDRATES
PLASTICS
PRECIPITATION
SATURATION
SODIUM CHLORIDES
SODIUM SULFATES
WATER
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
DIMENSIONLESS NUMBERS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
IONS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
SCATTERING
SEPARATION PROCESSES
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
SYNTHETIC MATERIALS