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

A technology with high aspect ratio and low temperature conditions, applied in the direction of nanotechnology, calcium/strontium/barium sulfate, etc., can solve the problems of complex preparation process, high reaction temperature, and high equipment requirements, and achieve simple preparation process and low reaction temperature , good solubilizing effect

Inactive Publication Date: 2017-05-31
SHANGHAI UNIV
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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.

Method used

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

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Embodiment

[0021] A method for preparing calcium sulfate nanowires with high aspect ratio under low temperature conditions, the specific steps are;

[0022] (1). Preparation of sodium sulfate reverse microemulsion composed of n-pentanol, cyclohexane, sodium sulfate, cetyltrimethylammonium bromide, the steps are: 3.2ml of n-pentanol solution, cyclohexane 38ml of alkane solution and 1ml of sodium sulfate solution with a molar concentration of 0.1mol / L were mixed evenly, then 2.1g of cetyltrimethylammonium bromide was added to the mixed solution, and after completely dissolving, a sodium sulfate reverse microemulsion was prepared ;

[0023] (2). Preparation of calcium chloride reverse microemulsion composed of n-amyl alcohol, cyclohexane, sodium sulfate, cetyltrimethylammonium bromide, the steps are: 3.2ml n-amyl alcohol solution, volume Mix 38ml of cyclohexane solution with a fraction of 92.2vol.% and 1ml of calcium chloride solution with a molar concentration of 0.1mol / L, and then add 2....

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y40/00
CPCC01F11/46C01P2002/72C01P2004/04C01P2004/16C01P2004/61C01P2004/64
Inventor 王钢领冯欣施利毅曹绍梅
Owner SHANGHAI UNIV
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