Method for preparing high-length-diameter-ratio calcium sulfate nanowires under low-temperature conditions

Abstract

The invention discloses a method for preparing high-length-diameter-ratio calcium sulfate nanowires under low-temperature conditions. The method comprises the following steps: (1) preparing a sodium sulfate inverse microemulsion composed of n-pentanol, cyclohexane, sodium sulfate and cetyl trimethylammonium bromide; (2) preparing a calcium chloride inverse microemulsion composed of n-pentanol, cyclohexane, sodium sulfate and cetyl trimethylammonium bromide; (3) mixing the sodium sulfate inverse microemulsion prepared in the step (1) and the calcium chloride inverse microemulsion prepared in the step (2) to obtain a transparent uniform mixed microemulsion; (4) adding 4-12 vol% acetone or ethanol into the mixed microemulsion, and carrying out demulsification reaction; and (5) carrying out centrifugal separation on the demulsified mixed microemulsion, sequentially carrying out ultrasonic cleaning with acetone and ethanol, and drying to obtain the calcium sulfate nanowire product. The method has the advantages of simple technique, high efficiency and low cost, and implements continuous production. The prepared calcium sulfate nanowires have favorable solubilizing power, the length-diameter ratio is 20-400, and thus, the calcium sulfate nanowires can satisfy the market demands.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate nanowires with high aspect ratio under low temperature conditions, and belongs to the technical field of preparation and modification of calcium sulfate nanowires. Background technique [0002] Calcium sulfate whiskers, also known as gypsum whiskers, are fibrous single crystals with complete shape, uniform cross-section, and perfect internal structure. The calcium sulfate whiskers prepared at present are usually micron-sized, with a diameter of 1-10 μm and a length of several Ten microns to hundreds of microns, can be used in environmental engineering, asphalt modification, coatings, fillers, etc., with a wide range of applications. [0003] According to the dimensions, nano calcium sulfate can be divided into: calcium sulfate nanoparticles, calcium sulfate nanosheets, calcium sulfate nanorods, calcium sulfate nanotubes, calcium sulfate nanowires, calcium sulfate nanobeams, etc. Calcium s...

AI Technical Summary

Problems solved by technology

The microemulsion method has a stable reaction system and stable product quality and is widely used. However, its preparation process is complicated, the reaction temperature is high, and the energy consumption is large.

[0005] The preparation of calcium sulfate nanowires by the hydrothermal method and solvothermal method is usually produced in a batch manner, the reaction temperature is generally higher than 100°C, and the efficiency is low, and the energy consumption is large and the equipment requirements are relatively high.

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