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In-situ synthesis method for nano-gold composite hydrogel smart material

A nano-composite and hydrogel technology, applied in the fields of polymer materials and nano-materials, can solve the problems of single hydrogel property, limited application of hydrogel, etc., and achieves good fixation effect, simple operation and high feasibility of preparation process. Effect

Inactive Publication Date: 2012-09-19
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the shortcomings of traditional hydrogels with single properties, the application of hydrogels is greatly limited; therefore, in recent years, scientists have launched a series of extensive research work on improving the performance of hydrogels and their applications in composite materials. , research reports in this area are increasing day by day

Method used

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  • In-situ synthesis method for nano-gold composite hydrogel smart material
  • In-situ synthesis method for nano-gold composite hydrogel smart material
  • In-situ synthesis method for nano-gold composite hydrogel smart material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation and Characterization of Nanogold

[0027] First, accurately weigh the HAuCl 4 .4H 2 O 0.0123 was dissolved in 100mL deionized water, and then added to a 250mL fixed three-neck flask. Stir vigorously and heat to reflux. Accurately weigh 0.2849 g of sodium citrate and dilute to volume in a 25 mL volumetric flask. After the water bath was heated to 50°C, a certain volume of sodium citrate solution was accurately pipetted into the flask with a pipette. The solution turns from colorless to light blue to purple and finally to wine red. After continuing to heat for 10 minutes, stop heating, continue stirring for 10 minutes and then cool to room temperature to obtain the required 13±2.5nm gold colloid. The diameter of gold nanoparticles was finally determined using a transmission electron microscope (JEOL JEM-200CX, Japan).

[0028] In situ synthesis of GNPs-PAAM gel

[0029]In order to prevent impurities in chemically pure polyacrylamide from discoloring gold...

Embodiment 2

[0032] Swelling kinetics of GNPs-PAAM hydrogels

[0033] Put a certain quality of GNPs-PAAM dry gel into deionized water, put it into the deionized water after reaching the swelling equilibrium, start timing, take out the gel at regular intervals, wrap it with nylon cloth, dry it with filter paper, and measure the hydraulic coagulation. The weight of the glue until the swelling equilibrium is reached, and the swelling ratio is calculated. Another PAAM xerogel was taken and tested with the same experimental method for comparison. The swelling kinetic curves of the two gels are as follows figure 2 shown

[0034] Swelling rate of GNPs-PAAM hydrogel under the effect of salt concentration

[0035] Prepare a series of NaCl solutions with different concentrations, put a certain mass of dry gel into salt solutions with different concentrations, and after reaching the swelling equilibrium, take out the gel and wrap it with nylon cloth, dry the water on the surface with filter paper...

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Abstract

The invention discloses a method for nano-gold hydrogel, which is simple and green, even in in-situ synthesis distribution, good in dispersibility, and good in stability under different environments. The method can be controlled from the temperature, to replace the surface active agent and the fixed nano-gold perssad-containing monomer used in the conventional nano-gold hydrogel synthesis method, so as to seek a simple, non-toxic and green nano-gold hydrogel synthesis method, so that the method not only is good in research value academically, but also is wide in application prospect on the production and application. The N, N-methylene benzene thin amide with different concentrations can be selected to be taken as cross-linking agent, or the diameter parameter of preparing the nano-gold can be adjusted, so that the hydrogel with different mesh sizes can be prepared to meet the different requirements; and therefore, the effective control over the nano-particles with different diameters can be really realized to some degree. The synthesis method provided by the invention is simple and practical to operate, and the prepared polyacrylamide-nano-gold composite hydrogel is good in dispersibility, and very good in stability, and has environment sensitivity responsiveness such as pH and temperature.

Description

technical field [0001] The invention belongs to the field of nanomaterials and macromolecular materials, and relates to an in-situ synthesis method of a nano-gold composite hydrogel intelligent material; specifically, acrylamide (AAM) is used as a monomer for synthesizing the gel, and is carried out in a nano-gold solution In-situ synthesis can produce intelligent composite materials with stable properties, good optical properties, and sensitivity to salt, temperature, pH and other environments. Background technique [0002] Gold nanoparticles (GNPs) refer to gold particles with sizes ranging from 1 to 100 nm. Generally, it is a hydrosol dispersed in water, so it is also called colloidal gold. Gold nanoparticles can be combined with a variety of biomolecules, and can be adsorbed with some nucleophiles to form groups with special functions; they can also undergo non-covalent electrostatic adsorption with amino groups, and form strong covalent bonds with sulfhydryl groups . ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/38C08F2/44C08K3/08B22F9/24B82Y40/00B82Y30/00
Inventor 田丹碧刘会祥黄河江凌张卫汤燕
Owner NANJING UNIV OF TECH