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Citation: LI Xiang-Qing, CHEN Qiang, ZHANG Lin-E, MU Jin. Preparation of Calcium Sulfate Whisker in Micrometer Scale[J]. Chinese Journal of Applied Chemistry, ;2007, 24(8): 945-948. shu

Preparation of Calcium Sulfate Whisker in Micrometer Scale

1.
Department of Chemistry, East China University of Science and Technology, Shanghai 200237

Corresponding author: MU Jin,
Received Date: 11 September 2006
Available Online: 20 November 2006
Fund Project:

CaSO₄·2H₂O whiskers in micrometer scale were prepared with CaCl₂ and (NH₄)₂SO₄ as the main raw materials via an ultrasonic process at room temperature.The product with better smoothness and higher aspect ratio was obtained.The method is friendly with environment and simple in manipulation under mild conditions.The effects of volume of anhydrous alcohol,concentration of hexadecyltrimethylammonium bromide (CTAB),ultrasonic time,heat-treatment and aging time on the morphology and size of CaSO₄·2H₂O were investigated in details.It has been found that the volume of anhydrous alcohol is important to the growth of CaSO₄·2H₂O whiskers.Anhydrous alcohol with excessive or insufficient volume is unfavorable to the preparation of the target product and the aspect ratio of CaSO₄·2H₂O whiskers is controlled by the concentration of CTAB.When the volume of anhydrous alcohol is 20 mL,the concentration of CTAB is 0.9 mmol/L and ultrasonic time is 1 h,the target product was prepared.The whisker became shiver,which coincide with the results of TG.Different from the general preparation process of inorganic compounds,aging time has no influence on the aspect ratio of CaSO₄ whisker.The structure and thermostability of the product were characterized by X-ray diffraction and thermal gravimetric analysis,respectively.The growth mechanism of CaSO₄·2H₂O whiskers is discussed simply according to the experiment result.Some regulative rules of preparing CaSO₄·2H₂O whisker with high aspect ratio have been obtained.
- calcium sulfate,
- whisker,
- preparation,
- micrometer scale
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