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A cross-structure fluorotitanic acid

A technology of fluorotitanic acid and cross, which is applied in the field of cross-structure fluorotitanic acid, can solve the problems of limited mass transfer and in-situ growth of products, and achieve the effects of simple preparation process, easy control of reaction conditions, and short reaction time

Active Publication Date: 2018-01-09
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the mass transfer of the resulting structural growth products along the substrate surface is greatly limited by the extremely thin liquid layer thickness, so that the products can only grow in situ

Method used

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  • A cross-structure fluorotitanic acid
  • A cross-structure fluorotitanic acid
  • A cross-structure fluorotitanic acid

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Experimental program
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Embodiment Construction

[0022] First, use 3mol HCl to hydrolyze chitosan (Aladdin's reagent) at 105°C for 2 hours. After the reaction is completed, centrifuge and wash with water, and freeze-dry the obtained product. The obtained chitosan dry powder is made into 50ml of a solution with a mass fraction of 0.02%, then fully mixed with 50ml of a polyvinyl alcohol solution with a mass fraction of 0.02%, quick-frozen in cold hydrazine at -50°C, and then placed on a freeze dryer to freeze Dry to obtain white chitosan / polyvinyl alcohol composite fibers. In order to improve the mechanical strength of the fibers, the fibers were annealed at 250°C for 1h in an air atmosphere, and the heating rate was 1°C / min. Soak the annealed fiber in 50ml of titanium tetrafluoride / glucose (both mass is 1g) mixed aqueous solution, take it out after 1h, and freeze-dry. Then put it on the polytetrafluoroethylene bracket, put the bracket in the liner of the polytetrafluoroethylene reactor, add 20ml of 2% hydrofluoric acid aqueo...

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Abstract

The invention discloses a cross-structure fluorotitanic acid (HTiOF3) crystal, which mainly uses the chitosan / polyvinyl alcohol composite fiber rich in hydroxyl and amino groups to absorb Ti4+, and then reacts with the water vapor of hydrofluoric acid under the gas phase hydrothermal condition reaction. This method has a simple preparation process and does not require complicated post-processing processes. In addition, the preparation process has a short reaction time and the reaction conditions are easy to control, which provides a scientific basis for studying the regulation of crystal morphology.

Description

technical field [0001] The invention belongs to the field of fluorotitanic acid, in particular to a cross-structure fluorotitanic acid. Background technique [0002] The regulation of crystal shape is a great challenge in many fields, and classical anisotropic crystal growth theories such as crystal self-limitation and Woolf construction have been accepted. The interface between the crystal and the surrounding medium is a very important factor for the growth of the crystal. The most commonly used method to regulate crystal growth behavior in a liquid system is to add suitable capping agents, such as organic surfactants or inorganic ions. These capping agents can be preferentially adsorbed on specific crystal planes to block or delay their growth, resulting in anisotropic shape evolution process. [0003] TiO 2 It has been widely studied due to its important applications in environmental and energy-related fields, especially in solar energy conversion, solar fuel cells, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B25/00C30B29/60C30B29/32
Inventor 吴天星汪国忠张显秦楠楠张云霞赵惠军
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI