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Gold nanoparticle/hydrogel compound material, preparation method and application thereof

A technology of gold nanoparticles and composite materials, applied in the field of gold nanoparticles/hydrogel composite materials and their preparation, can solve problems such as difficulty in realizing pH value visual sensing, and achieve the effects of cost saving and waste avoidance

Active Publication Date: 2017-05-31
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem in the prior art that it is difficult to realize the visual sensing of pH value with a single pH-sensitive hydrogel, the present invention provides a gold nanoparticle / hydrogel composite material and its preparation method and application, so as to realize the Visual sensing and detection of environmental pH changes

Method used

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  • Gold nanoparticle/hydrogel compound material, preparation method and application thereof
  • Gold nanoparticle/hydrogel compound material, preparation method and application thereof
  • Gold nanoparticle/hydrogel compound material, preparation method and application thereof

Examples

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preparation example Construction

[0039] The preparation method of the above-mentioned gold nanoparticle / hydrogel composite material can first disperse a plurality of gold nanoparticles into the hydrogel reaction solution, then adopt the microfluidic control method in the prior art to make a water-in-oil emulsion, and then use The photopolymerization method polymerizes and solidifies the hydrogel reaction liquid in the water-in-oil emulsion, thereby making gold nanoparticles / hydrogel composite microspheres; and the gold nanoparticles can be obtained by reducing gold chloride in ethylene glycol. acid to prepare gold octahedron nanoparticles, and then use chloroauric acid to etch the gold octahedron nanoparticles into regular spherical gold nanoparticles. The preparation method of the gold nanoparticle / hydrogel composite material may specifically include the following steps:

[0040] Step A, dispersing a plurality of gold nanoparticles with a particle size of 20-100 nm in the hydrogel reaction liquid, thereby ob...

Embodiment 1

[0049] A gold nanoparticle / hydrogel composite material is prepared by the following steps:

[0050] Step a, use a 20-200 μL pipette to pipette 35 μL of chloroauric acid with a concentration of 1 mol / L, and use a 1-5 mL pipette to pipette 1.4 mL of polydiallyldimethylammonium chloride, and put both In a 100mL glass bottle; then use a 100mL graduated cylinder to measure 70mL of ethylene glycol and add it to the 100mL glass bottle, and stir evenly to obtain a gold nanoparticle reaction solution. At this time, the color of the liquid in the 100mL glass bottle was uniform light green.

[0051] Step b. Put the gold nanoparticle reaction solution in step a into an oil bath for 30 minutes to react, and the temperature of the oil bath is 195-220° C., so as to prepare a mixed solution containing gold octahedral nanoparticles. In this step, the color of the liquid in the 100mL glass bottle changed from light green to purple, and then from purple to dark red.

[0052] Step c, lower the ...

Embodiment 2

[0060] A gold nanoparticle / hydrogel composite material, using the above-mentioned preparation method of Example 1 of the present invention, the only difference is that the amount of acrylic acid in step e changes from 480 μL in Example 1 to 240 μL, and at this time the acrylamide The molar ratio to acrylic acid is about 2:1.

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Abstract

The invention discloses a gold nanoparticle / hydrogel compound material, a preparation method and an application thereof. The gold nanoparticle / hydrogel compound material is a gold nanoparticle / hydrogel compound microsphere. A plurality of gold nanoparticles are distributed in a microsphere body of the gold nanoparticle / hydrogel compound microsphere; the grain size of the hydrogel microsphere is 10-1000 micrometers; the grain size of the gold nanoparticle is 20-100nm. The preparation method thereof comprises the following steps: dispersing the plurality of gold nanoparticles in a hydrogel reaction solution to be used as a dispersing phase; using an oily solution as a continuous phase; adopting a micro-flow control method for preparing a water-in-oil emulsion; placing under an ultraviolet lamp with wavelength of 311nm and irradiating; curing a mixed gel solution in the water-in-oil emulsion as the gold nanoparticle / hydrogel compound microsphere; and cleaning with an organic solvent, thereby obtaining a clean gold nanoparticle / hydrogel compound microsphere. According to the invention, the visual sensing and detection for environmental pH value and glucose concentration can be realized.

Description

technical field [0001] The invention relates to the field of organic-inorganic nanocomposite materials, in particular to a gold nanoparticle / hydrogel composite material and its preparation method and application. Background technique [0002] Hydrogel is a gel with water as the dispersion medium. It has a polymer network system, is soft in nature, can maintain a certain shape, and can absorb a large amount of water. It introduces hydrophobic groups and hydrophilic groups into water-soluble polymers with a network crosslinked structure, and the hydrophilic groups combine with water molecules to connect the water molecules inside the network, while the hydrophobic groups swell with water cross-linked polymers. [0003] Hydrogels can be divided into ordinary hydrogels and environment-sensitive hydrogels (ie, smart hydrogels). Environmentally sensitive hydrogels can sense small changes or stimuli in the external environment (for example: changes in pH, temperature, pressure, e...

Claims

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Application Information

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IPC IPC(8): B01J13/00G01N21/31G01N21/49
CPCB01J13/0056G01N21/31G01N21/49
Inventor 李越李桧林门丹丹张涛杭立峰温路路蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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