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Method for continuous preparation of triangular silver nanoparticles with controllable arrangement

A technology of triangular silver and nanoparticles, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, to achieve the effect of repeatable and stable results, high yield, and short reaction time

Active Publication Date: 2019-05-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that although this method uses a microchannel reactor, it does not really realize the continuous production of triangular silver nanoparticles.

Method used

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  • Method for continuous preparation of triangular silver nanoparticles with controllable arrangement
  • Method for continuous preparation of triangular silver nanoparticles with controllable arrangement
  • Method for continuous preparation of triangular silver nanoparticles with controllable arrangement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] by AgNO 3 with NaBH 4 In the presence of sodium citrate and sodium lauryl sulfate, by H 2 o 2 The oxide-etching reaction in the microchannel reactor directly prepared the SDS-protected triangular silver nanoparticles.

[0037] Triangular silver nanoparticles arranged vertically are obtained, and the specific operation steps are as follows:

[0038] Specific steps:

[0039] (1) 0.017g AgNO 3 Dissolve in 200mL deionized water to make a 0.0005mol / L solution, add 0.6g SDS and 0.08g sodium citrate to it to keep AgNO 3 The molar ratio with sodium citrate is 0.035:1, stir for 10 minutes to make it fully mixed;

[0040] (2) Add 0.0076g NaBH 4 Dissolve in 200mL ice-deionized water to make a 0.001mol / L solution, bathe in ice for 10min, add 0.8mL of 1mol / L NaOH solution, keep the pH of the solution at about 11.5, and stir evenly;

[0041] (3) Add 30% H to the solution obtained in (1) 2 o 2 Solution 3mL, stir well;

[0042] (4) All the solutions obtained in (2) and (3) a...

Embodiment 2

[0044] Triangular silver nanoparticles arranged in tiles are obtained, and the specific operation steps are as follows:

[0045] (1) 0.0272g AgNO 3 Dissolve in 200mL deionized water to make a 0.0008mol / L solution, add 0.6g SDS and 0.8g sodium citrate to it to keep AgNO 3 The molar ratio with sodium citrate is 0.7:1, stir for 10 minutes to make it fully mixed;

[0046] (2) Add 0.0122g NaBH 4 Dissolve in 200mL ice-deionized water to make a 0.0016mol / L solution, bathe in ice for 10min, add 0.8mL of 1mol / L NaOH solution, keep the pH of the solution at about 11.5, and stir evenly;

[0047] (3) Add 30% H to the solution obtained in (1) 2 o 2 Solution 3.4mL, stir well;

[0048] (4) All the solution obtained from (2) and (3) is injected into the microchannel reactor through a syringe pump at a flow rate of 1mL / min. After the solution is mixed, it reacts in the capillary microreactor, keeping the capillary microchannel at 40 ℃ water bath, prepared triangular silver nanoparticles ...

Embodiment 3

[0050] The triangular silver nanoparticles that are arranged vertically in flat tiles are obtained, and the specific operation steps are as follows:

[0051] (1) 0.034g AgNO 3 Dissolve in 200mL deionized water to make a 0.001mol / L solution, add 0.6g SDS and 0.5g sodium citrate to it to keep AgNO 3 The molar ratio with sodium citrate is 0.12:1, stir for 10 minutes to make it fully mixed;

[0052] (2) Add 0.0152g NaBH 4 Dissolve in 200mL ice-deionized water to make a 0.002mol / L solution, bathe in ice for 10min, add 1mol / L NaOH solution to adjust the pH of the solution to about 11.5, and stir evenly;

[0053] (3) Add 30% H to the solution obtained in (1) 2 o 2 Solution 4mL, stir well;

[0054] (4) The solution obtained in (2) and (3) is passed into the microchannel reactor through a syringe pump at a flow rate of 0.8mL / min. After the solution is mixed, it reacts in the capillary microreactor to keep the microchannel reactor and capillary microreactor in a 40°C water bath to...

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Abstract

The invention provides a method for continuously preparing triangular silver nanoparticles with controllable arrangement, specifically 1) under dark conditions, sodium citrate, AgNO 3 Aqueous solution, sodium dodecyl sulfate (SDS), H 2 o 2 Aqueous solutions were mixed to obtain AgNO-containing 3 2) prepare pH=10‑12 containing NaBH 4 The aqueous solution; 3) will contain NaBH 4 aqueous solution containing AgNO 3 The mixed solution of the mixed solution is passed into the microchannel reactor with the same flow rate, the outlet of the microchannel reactor is connected with the capillary microreactor, and the capillary microreactor is immersed in a water bath at 20-70 ° C, and the arrangement can be arranged at the outlet end of the capillary microreactor. controlled triangular silver nanoparticles. Wherein, the arrangement mode of the triangular silver nanoparticles is regulated by changing the concentration of sodium citrate, specifically tiling and vertical arrangement. The invention has the advantages of simple process, short reaction time, continuous process, mild reaction conditions, no pre-synthesis of seed crystals, high yield of silver nanoparticles, stable repeated results, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of triangular silver nanoparticles, and relates to a method for continuously preparing triangular silver nanoparticles with a controllable arrangement mode by using a microchannel reactor, in particular to a method for preparing triangular silver nanoparticles in a tiled and vertical arrangement mode . Background technique [0002] Silver nanoparticles have unique optical properties and can generate strong surface plasmon resonance (SPR) with light, and have broad application prospects in the fields of physical chemistry, biosensing, and medicine. The morphology of silver nanoparticles is the main factor affecting the SPR spectrum, and silver nanoparticles with different shapes exhibit different SPR spectra. Compared with other morphologies, triangular silver nanoparticles have special SPR spectrum, that is, there are three SPR peaks of weak out-of-plane quadrupole, in-plane quadrupole and strong in-pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02B82Y40/00B82Y30/00
Inventor 陈光文陶莎杨梅任明月
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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