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Preparation and application of a pnipam/pva composite temperature-sensitive gel loaded with nano-silver

A temperature-sensitive gel and temperature-sensitive hydrogel technology, applied in organic compound/hydride/coordination complex catalysts, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of cumbersome operation and high cost, Achieve the effect of simple sample preparation, low cost and strong water absorption capacity

Inactive Publication Date: 2019-09-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 substrates for Raman detection. For example, pure gold or pure silver nanomaterials are used as substrates to detect crystal violet, but the cost is high. Relatively cumbersome to operate

Method used

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  • Preparation and application of a pnipam/pva composite temperature-sensitive gel loaded with nano-silver
  • Preparation and application of a pnipam/pva composite temperature-sensitive gel loaded with nano-silver
  • Preparation and application of a pnipam/pva composite temperature-sensitive gel loaded with nano-silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare the PNIPAM / PVA composite temperature-sensitive gel loaded with nano-silver, comprising the following steps:

[0034] Step 1, adopt free radical polymerization method to prepare the PNIPAM thermosensitive hydrogel containing PVA: the preparation mass percentage is the NIPAM solution of 8%, the preparation mass percentage is the PVA solution of 4%, the preparation mass percentage is the initiator APS of 10% solution;

[0035] Take 6.8mL of NIPAM solution and 1.2mL of PVA solution, add 12.8mg of cross-linking agent MBA and mix well, then add 100μL initiator APS, stir at room temperature for 30 minutes, add 120μL TEMED, stir for 5 minutes; Constant temperature water bath, static 24 hours, made the PNIPAM thermosensitive hydrogel containing PVA, denoted as p-1, the SEM photograph of this p-1 is shown in Figure 1 (b); The hydrogel made Soak in distilled water for 4 days, during which the water was changed every day to wash away unreacted NIPAM, and the soaked gel was...

Embodiment 2

[0038] Prepare the PNIPAM / PVA composite temperature-sensitive gel loaded with nano-silver, the basic process is the same as in Example 1, the only difference is that the amount of NIPAM solution and PVA solution in step 1 is different, that is, get 5.2mL of NIPAM solution and 2.8mL of PVA solution, the PNIPAM temperature-sensitive hydrogel containing PVA is obtained by step 1, denoted as p-2, the SEM photo of this p-2 is shown in Figure 1 (c); after step 2, the final product obtained It is the PNIPAM / PVA composite temperature-sensitive gel loaded with nano-silver, which is denoted as p-2, and the TEM photo of the silver-loaded p-2 is shown in Fig.

Embodiment 3

[0040] Prepare the PNIPAM / PVA composite temperature-sensitive gel loaded with nano-silver, the basic process is the same as in Example 1, the only difference is that the amount of NIPAM solution and PVA solution in step 1 is different, that is, get 5.2mL of NIPAM solution and 2.8mL of PVA solution; the mass volume concentration of silver nitrate solution is changed into 0.010g / mL by 0.005g / mL in the step 2; The PNIPAM temperature-sensitive hydrogel containing PVA is obtained by step 1, denoted as p-2, this The SEM photo of p-2 is shown in Figure 1(c); after step 2, the final product obtained is the PNIPAM / PVA composite temperature-sensitive gel loaded with nano-silver, which is denoted as p-2' loaded with silver, and the p-2 loaded with silver 'The TEM photo of silver nanoparticles is shown in Figure 3(b).

[0041] From Fig. 1(a), Fig. 1(b) and Fig. 1(c), it can be seen that the pores of p-0, p-1 and p-2 gels (without silver loading) are getting smaller and smaller. The dense...

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Abstract

The invention discloses a preparation method of nano-silver-carrying PNIPAM / PVA composite thermosensitive gel. PNIPAM / PVA thermosensitive hydrogel prepared with a free radical polymerization method is used as a reducing medium, and silver nanoparticles are reduced in a network structure of the hydrogel; the finally prepared material is used as the substrate of SERS and soaked in crystal violet probe molecular solutions with different concentrations for a certain time; then the substrate material with probe molecules adsorbed on the surface is taken out, placed on a slide for airing and used for Raman detection. The hydrogel in the gel is used as a dispersion stabilizer and can play a role in support protection for electromagnetically enhanced nano-silver particles; when the gel is adopted as the substrate for detecting crystal violet at the room temperature, the detection limit can reach 10<-9> orders of magnitude, and the fact that the intensity of a Raman signal varies with temperature is also found. The disclosed SERS substrate adopts simple preparation method and is good in temperature response and has broad application prospect in fields of food additives, pesticide detection, sensing and the like.

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 PNIPAM / PVA composite temperature-sensitive gel loaded with nano-silver and its application as a Raman substrate. Background technique [0002] Crystal violet is a basic triphenylmethane purple dye, which belongs to non-food raw materials and is an excellent biological dye. 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 the environment. Therefore, the residual detection of this basic dye is one of the important issues in food safety analysis. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28G01N21/65
Inventor 李方于治芳薛涛
Owner TIANJIN UNIV
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