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Amorphous calcium carbonate nanosheet material and preparation method thereof

A calcium carbonate and nanosheet technology, applied in the field of nanomaterials, can solve the problems of harsh and complex experimental conditions, and achieve the effects of easy mass production, simple and easy-to-obtain template materials, and simple and controllable preparation methods.

Active Publication Date: 2015-09-09
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The currently disclosed preparation method of synthesizing amorphous calcium carbonate nanosheet material mainly adopts charged nanoparticles or macromolecular polymers to obtain amorphous calcium carbonate as a stable and inhibitory agent to control the growth of calcium carbonate in the mineralization process, such as : "Journal of the American Chemical Society" reported from page 11977 of the one hundred and twenty volume in 1998 that polyacrylic acid was used as an inhibitor to successfully mineralize and assemble amorphous calcium carbonate-calcite calcium carbonate coexistence on the amphiphilic biline template. Thin slices; British "Natural Materials" journal 2012 volume eleventh page 3 reported the use of charged nanoparticles as a supramolecular surface modifier to control and stabilize the growth of calcium carbonate crystallites; although these methods can obtain the target product , but the experimental conditions are often harsh and complicated, and toxic reagents are involved in the process, and stable amorphous calcium carbonate is difficult to use for deeper assembly to prepare new materials

Method used

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  • Amorphous calcium carbonate nanosheet material and preparation method thereof
  • Amorphous calcium carbonate nanosheet material and preparation method thereof
  • Amorphous calcium carbonate nanosheet material and preparation method thereof

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[0035] The present invention provides a kind of preparation method of amorphous calcium carbonate nano sheet material, comprising:

[0036] 1) washing the tellurium nanowires to obtain the washed tellurium nanowires,

[0037] The zeta potential of the washed tellurium nanowires is less than or equal to -14mV;

[0038] 2) mixing the washed tellurium nanowires with the first solvent to obtain a tellurium nanowire solution,

[0039] The volume ratio of the tellurium nanowires to the first solvent is (0.2-10):1;

[0040] 3) reacting the tellurium nanowire solution, the calcium source and the carbon source to obtain the amorphous calcium carbonate nanosheet material.

[0041] According to the present invention, the present invention first washes the tellurium nanowires to obtain the washed tellurium nanowires; wherein, the diameter of the tellurium nanowires is 1 nm to 50 nm, more preferably 5 nm to 40 nm, most preferably 7 nm to 35 nm, most preferably Preferably 10nm-30nm; the ...

Embodiment 1

[0058] 1) Synthesis of tellurium nanowires

[0059] Weigh 2g of polyvinylpyrrolidone and dissolve it in 66mL of deionized water in 100mL of polytetrafluoroethylene lining, weigh 0.1846g of sodium tellurite and add it to the polytetrafluoroethylene lining, and stir until the solution is clear. Then add 6.7mL of ammonia deionized water (mass fraction 25-28%) and 3.3mL hydrazine hydrate (mass fraction 85%), stir for 3h until uniform, react in a closed reaction vessel at 180°C for 3 hours, cool naturally for later use, and obtain Precipitated 7nm tellurium nanowires;

[0060] Observation of Te nanowires precipitated by parasite, the results are shown in figure 2 , figure 2 TEM pictures of unprecipitated 7nm tellurium nanowires provided for the embodiments of the present invention;

[0061] 2) Precipitation of tellurium nanowires

[0062] Add 15mL of acetone to 4mL of unprecipitated 7nm tellurium nanowires. After about 10min, the tellurium nanowires gather at the bottom of th...

Embodiment 2

[0078] 1) Synthesis of tellurium nanowires

[0079] Weigh 2g of polyvinylpyrrolidone and dissolve it in 66mL of deionized water in 100mL of polytetrafluoroethylene lining, weigh 0.1846g of sodium tellurite and add it to the polytetrafluoroethylene lining, and stir until the solution is clear. Then add 6.7mL of ammonia water (mass fraction 25-28%) and 3.3mL of hydrazine hydrate (mass fraction 85%), stir for 3 hours until uniform, and react in a closed reaction vessel at 180°C for 3 hours, cool naturally for use, and obtain unprecipitated 7nm Tellurium nanowires;

[0080] 2) Precipitation of tellurium nanowires

[0081] Add 6mL of acetone to 1.5mL of unprecipitated 7nm tellurium nanowires. After about 10min, the tellurium nanowires are aggregated at the bottom of the beaker. Take out the black agglomerates and transfer them to a 50mL centrifuge tube at a speed of 8000rpm, centrifuge for 3min, wash with deionized water 3 times, ethanol Washing 3 times to obtain tellurium nanowi...

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Abstract

The invention provides an amorphous calcium carbonate nanosheet material and a preparation method thereof. Tellurium nanowires are washed, and washed tellurium nanowires are obtained; then a tellurium nanowire solution is prepared from the washed tellurium nanowires, the tellurium nanowire solution, a carbon source and a calcium source have a reaction, and the amorphous calcium carbonate nanosheet material is obtained; the zeta potential of the washed tellurium nanowires is controlled to be smaller than or equal to minus 14 mV, the volume ratio of the tellurium nanowires to a first solvent is controlled to be (0.2-10):1, so that one-dimensional tellurium nanowire materials used as formworks can induce the calcium source to react with the carbon source, amorphous calcium carbonate is obtained, and the nanosheet material can be further assembled. Meanwhile, according to the preparation method, materials of the formworks are simple and easy to obtain, the preparation method is simple and controllable, and batch production is facilitated.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to an amorphous calcium carbonate nanosheet material and a preparation method thereof. Background technique [0002] Amorphous calcium carbonate is a type of calcium carbonate that exists in many biological tissues. The study of amorphous calcium carbonate not only helps to understand the mechanism of biomineralization, but also has important applications in the assembly of new materials. As a new assembly unit, amorphous calcium carbonate nanosheets are widely used in many aspects such as the preparation of mechanically reinforced materials or the loading of functional nanoparticles. [0003] The currently disclosed preparation method of synthesizing amorphous calcium carbonate nanosheet material mainly adopts charged nanoparticles or macromolecular polymers to obtain amorphous calcium carbonate as a stable and inhibitory agent to control the growth of calcium carbonate in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00
Inventor 俞书宏刘洋溢刘蕾陈思铭
Owner UNIV OF SCI & TECH OF CHINA
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