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Ultrathin calcium silicate nanosheet with ultrahigh specific surface area and preparation method thereof

A technology of ultra-high specific surface area and nanosheets, which is applied in nanotechnology, silicate, nanotechnology, etc. for materials and surface science, and can solve problems such as hindering performance design and improvement, lack of structural information, and less success in compounding , to achieve the effect of convenient operation, uniform shape and size, and cheap raw materials

Active Publication Date: 2013-02-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium silicate hydrate (CSH) is the main product after hydration of Portland cement. Due to its poor crystallinity and complex structure, although the relevant research has gone through nearly a century, its precise structure is still controversial; the lack of structural information It also hinders the design and improvement of the performance of the material in related application fields
For example, mixing polymers into cement can help improve the mechanical properties of concrete, but true molecular-level compounding has been less successful because polymers tend to adsorb on the surface of CSH rather than intercalate between CSH sheets.

Method used

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  • Ultrathin calcium silicate nanosheet with ultrahigh specific surface area and preparation method thereof
  • Ultrathin calcium silicate nanosheet with ultrahigh specific surface area and preparation method thereof
  • Ultrathin calcium silicate nanosheet with ultrahigh specific surface area and preparation method thereof

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preparation example Construction

[0037] The preparation method provided by the present invention includes the step of slowly adding the prefabricated soluble calcium salt aqueous solution to the soluble silicate aqueous solution at a certain rate; wherein the molar ratio of Ca and Si in the resulting mixed solution is kept at 0.001-0.2min -1 Slowly increase the rate of the calcium salt solution, and control the addition of the calcium salt solution so that the molar ratio of Ca and Si in the final mixed solution is 0.2-4.0; stir the mixed solution for 0-120 hours, separate the product, and dry to obtain the calcium silicate hydrate ultrathin nanosheets.

[0038] figure 1 It is a flow chart of the preparation process of calcium silicate ultrathin nanosheets (calcium silicate hydrate ultrathin nanosheets and anhydrous calcium silicate ultrathin nanosheets). see figure 1 , in an example embodiment, the preparation method of calcium silicate hydrate ultra-thin nanosheet provided by the present invention, compri...

Embodiment 1

[0049] Embodiment 1: preparation calcium silicate hydrate ultra-thin nanosheet;

[0050] Ca(NO 3 ) 2 aqueous solution and 0.06mol / L Na 2 SiO 3 aqueous solution. At room temperature, under the condition of stirring, pour 50mL of Na with a concentration of 0.06mol / L 2 SiO 3 Add 5mL Ca(NO 3 ) 2 Aqueous solution, and control the addition rate to 2.5mL / h. After the addition is complete, continue to stir the obtained suspension for 3 hours, and then separate the product by centrifugation. The separated product is washed three times with deionized water and ethanol respectively. Dry to obtain calcium silicate hydrate ultra-thin nanosheets;

[0051] The BET specific surface area of ​​the calcium silicate hydrate ultra-thin nanosheets that the present embodiment makes is measured as 462m 2 / g (measuring instrument: Jin Ai spectrum V-Sorb 2800P specific surface meter; measuring method: after drying the sample at 150°C for 6 hours, calculate the BET specific surface area by nitr...

Embodiment 2

[0059] Embodiment 2: preparation calcium silicate hydrate ultra-thin nanosheet;

[0060] Ca(NO 3 ) 2 aqueous solution and 0.06mol / L Na 2 SiO 3 aqueous solution. At room temperature, under the condition of stirring, pour 50mL of Na with a concentration of 0.06mol / L 2 SiO 3 Add 5mL Ca(NO 3 ) 2 Aqueous solution, and control the addition rate to 1mL / h. After the addition is complete, continue to stir the obtained suspension for 3 hours, and then separate the product by centrifugation. The separated product is washed three times with deionized water and ethanol, and dried in an air atmosphere at 60°C. , to obtain ultrathin nanosheets of calcium silicate hydrate. The BET specific surface area of ​​the prepared calcium silicate hydrate ultra-thin nanosheets was determined to be 436m 2 / g (measuring instrument: King Aspect V-Sorb 2800P specific surface meter; measuring method: after drying the sample at 150°C for 6 hours, calculate the BET specific surface area by nitrogen mo...

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Abstract

The invention provides an ultrathin calcium silicate nanosheet with an ultrahigh specific surface area and a preparation method thereof. According to the ultrathin calcium silicate nanosheet with the ultrahigh specific surface area, the mole ratio of calcium to silicon is 0.4-1.5, the BET specific surface area is 200-550m<2> / g, and the thickness of the nanosheet is 1-10nm. The ultrathin calcium silicate hydrate nanosheet and an ultrathin non-crystal water calcium silicate nanosheet prepared by the method are uniform in shape and size and ultrathin in thickness, and the specific surface areas of the ultrathin calcium silicate hydrate nanosheet and the ultrathin non-crystal water calcium silicate nanosheet are larger than those of other calcium silicate nanosheets. Compared with the other methods in the prior art, the method provided by the invention has the advantages that the prepared ultrathin calcium silicate hydrate nanosheet and the prepared ultrathin non-crystal water calcium silicate nanosheet are very large in specific surface area, can be used as drug carriers, have extremely high drug loading capacity and good drug slow release performance on drugs difficult to dissolve in water, have the extremely strong capability of absorbing protein and heavy metal ions, and have a good application prospect in the fields of biological medicine and water treatment.

Description

technical field [0001] The invention belongs to the fields of nanobiological materials and water treatment, and relates to calcium silicate hydrate ultrathin nanosheets, crystal water-free calcium silicate ultrathin nanosheets and a preparation method thereof. Background technique [0002] In nature, many inorganic minerals have a layered structure, such as graphite, mica, some metal oxides, and layered silicates. The repeat spacing between the sheets of these layered minerals is generally between several (such as graphite) to a dozen (Montmorillonite), between the sheets to form a laminated structure through van der Waals force. Through mechanical or chemical exfoliation, these layered structured materials can be transformed into two-dimensional ultrathin nanosheet materials with high specific surface area, which expands their applications in catalysis, ion exchange, molecular adsorption, drug delivery, etc. So far, monolayer or oligolayer simple substances (such as gr...

Claims

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Application Information

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IPC IPC(8): C01B33/24B82Y30/00
Inventor 朱英杰吴进
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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