Preparation method of nano-silver-loaded polyvinyl alcohol hydrogel

A technology of polyvinyl alcohol and hydrogel, which is applied in the field of preparation of polyvinyl alcohol hydrogel, can solve the problems of cumbersome operation and high cost, and achieve the effect of simple preparation, low cost and good stability

Inactive Publication Date: 2016-10-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods for detecting crystal violet mainly include liquid chromatography detection and Raman-enhanced detection. Among them, there are many substrate...

Method used

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  • Preparation method of nano-silver-loaded polyvinyl alcohol hydrogel
  • Preparation method of nano-silver-loaded polyvinyl alcohol hydrogel
  • Preparation method of nano-silver-loaded polyvinyl alcohol hydrogel

Examples

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Embodiment 1

[0031] Example 1, according to references (YOSHIHIRO MORI, HITOSHI TOKURA, MASANORI YOSHIKAWA, Properties of hydrogels synthesized by freezing and thawing aqueous polyvinylalcohol solutions and their applications, JOURNAL OF MATERIALS SCIENCE 32 (1997) 491-496) using cycle Preparation of polyvinyl alcohol hydrogel

[0032] Take 1.1g of polyvinyl alcohol dissolved in 8ml of deionized water at 90°C, stir for 30min, then cool to room temperature, take 1ml of the above-mentioned solution with a syringe with a capacity of 1ml, put it in the refrigerator at -18°C for 12h, and protect it from light at room temperature Thaw, freeze-thaw cycle 4 times, finally push the thawed gel into the sample bottle, soak in deionized water, change the water every 8h, repeat 4 times. Finally, the gel is taken out and freeze-dried with a freeze dryer to obtain a dried pure polyvinyl alcohol gel.

Embodiment 2

[0033] The preparation method of the polyvinyl alcohol hydrogel loaded with nano-silver of embodiment 2 comprises the following steps:

[0034] Step 1. Prepare polyvinyl alcohol hydrogel containing nano-silver precursor by cycle freezing-thawing method: take 1.1g polyvinyl alcohol and dissolve it in 8ml deionized water at 90°C, stir for 30min, then cool to room temperature, and pour into the system Add 2ml of 20mM silver nitrate solution, stir for 15min, and then take out the solution and centrifuge (500rpm, 3min) to drive out the air bubbles in the system. Use a syringe with a capacity of 1ml to take 1ml of the above-mentioned solution, put it in the refrigerator at -18°C for 12 hours, and thaw it at room temperature in the dark, freeze-thaw cycle 4 times, and finally push the thawed gel into the sample bottle for use ;

[0035] Step 2. Restore the silver nitrate in the gel by "dipping" method: cut the 3mm thick gel in step 1, soak it in 10ml of sodium borohydride solution w...

Embodiment 3

[0037]Example 3 The preparation method of polyvinyl alcohol hydrogel loaded with nano-silver, compared with Example 2, the difference is that in step one, 2ml concentration of 50mM silver nitrate solution is added to the system instead, corresponding to step two The sodium borohydride concentration was 150 mM.

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Abstract

The invention discloses a preparation method of nano-silver-loaded polyvinyl alcohol hydrogel. Sodium borohydride is adopted as a reductant, and the nano-silver-loaded polyvinyl alcoholhydrogel with controllable morphology and particle size is prepared with a cycle freezing and thawing method and an immersion method. The operation is simple, complicated technological equipment is not needed, and polyvinyl alcohol adopted as a dispersion stabilizer can have supporting and protecting effects on nano-silver particles with enhanced electromagnetism. When crystal violet is detected with the nano-silver-loaded polyvinyl alcohol hydrogel, the detection limit of the hydrogel can reach 10-12 orders of magnitude, and the hydrogel is convenient to use and easy to operate.

Description

technical field [0001] The invention belongs to the preparation of a metal nano-polymer hydrogel composite material and its application in the field of surface Raman enhancement, and relates to the preparation of a polyvinyl alcohol hydrogel loaded with nano silver and its application as a Raman substrate. Background technique [0002] Crystal violet is a basic triphenylmethane purple dye. The solid powder is dark green and flashing. It turns purple when dissolved in water or ethanol. It belongs to non-food raw materials and is widely used in bacteriology, cytology and histology. , is an excellent biological stain. However, because of its low price, convenient use, and antibacterial activity, it is often illegally abused in aquaculture. Crystal violet and its metabolites have high toxicity and high residues. After long-term exposure or ingestion, they can easily lead to cancer, distortion, mutation, etc. in living organisms, which are very harmful to living organisms and th...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K3/08C08J3/075C08J9/28
CPCC08J3/075C08J9/28C08J2329/04C08K3/08C08K2003/0806C08K2201/011C08L29/04
Inventor 李方于治芳薛涛
Owner TIANJIN UNIV
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