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Isosteviol metal gel and preparation method and application thereof

A gel, alcohol sulfonic acid technology, applied in metal processing equipment, sulfonate preparation, transportation and packaging, etc., can solve problems such as pollution and increase costs, and achieve the effect of avoiding agglomeration, avoiding heating and removing, and reducing pollution

Active Publication Date: 2020-01-14
XINXIANG MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uniformly distributes silver ions into the gel system, and utilizes the reducing property of agarose to reduce the silver ions into nano-silver particles. However, the preparation of the gel requires a heating and cooling process, and the self-reduction process even takes 1-15 days. time
The 201810939378.6 patent reports the preparation of nano silver in solution, but uses chitosan-hydrazine thiourea derivatives as reducing agents, which increases the cost and causes pollution

Method used

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  • Isosteviol metal gel and preparation method and application thereof
  • Isosteviol metal gel and preparation method and application thereof
  • Isosteviol metal gel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation of embodiment 1 isosterveol isopropyl ester silver sulfonate

[0042] Dissolve isosteviol (5g 16mmol) in acetonitrile (31mL), add K 2 CO 3 (1.79g 32mmol), stirred with a magnetic stirrer in a 100mL flask, after the dissolving of isopropyl bromide, added 1.96g of isopropyl bromide, refluxed for 6 hours, TLC monitored the reaction process, after the reaction was complete, evaporated Acetonitrile. Add 200 mL of 5% dilute hydrochloric acid into the system, stir and wash, suction filter, wash with double distilled water repeatedly, collect and dry the filter cake to obtain isosterveol isopropyl ester (compound 2) as a white solid.

[0043] Under ice-bath conditions, add 1 mL of concentrated sulfuric acid to a 50 mL volumetric flask, and add acetic anhydride (6 mL) dropwise into the concentrated sulfuric acid with a constant pressure funnel under stirring. 3.7 g of isopropyl isosterveol was added therein. Stir until the reaction is complete, evaporate the ...

Embodiment 2

[0044] The preparation of embodiment 2 isosterveol isopropyl ester sulfonate silver gel

[0045]Weigh 2 mg of the above-prepared isosterveol isopropyl ester sulfonate silver compound, add it into a 5 mL pressure-resistant sample bottle, add chloroform gel solvent, ultrasonically disperse the gel, and let it stand for 24 hours. Use the inversion method to test whether the gel is formed and the minimum gel concentration. The phase transition temperature at different gel concentrations was tested by gradient heating method.

Embodiment 3

[0046] The preparation of embodiment 3 nanometer silver

[0047] Put the isosterveol isopropyl ester sulfonate silver gel in the bottle under natural light for 3 days or 365nm ultraviolet lamp for 30 minutes, the system will gradually turn black to obtain the nano silver gel system. The prepared gel system containing nano-silver was transferred to a silicon wafer, and dried naturally to obtain a xerogel sample. After spraying gold for 30 seconds, the gel morphology was observed under a scanning electron microscope. Ribbon-like nanostructures self-assembled by the gelling agent can be observed. After photoreduction, nano-silver is evenly attached to the gel.

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Abstract

The invention discloses an isosteviol sulfoacid silver supramolecular gel and a preparation method and an application thereof in preparation of nano silver, and belongs to the field of functional materials. The gel is prepared by esterification, sulfonation and salt-forming of the natural product isosteviol and is provided with a silver trifluoromethanesulfonate structural segment. The structureis shown in Formula 1, wherein R is an alkane group and an aromatic hydrocarbon group. The gel has good gel properties, the lowest gel concentration is as low as 0.2%w / v, and the nano silver can beprepared in situ through the green and convenient photoluminescence reduction process. The gel system has the advantages of a simple preparation method, low cost, and recoverable and reusable solvent.The prepared nano silver particle size is uniform and the method is simple, so that a convenient template for the preparation of the nano silver is provided. Please see the Formula 1 in the description.

Description

technical field [0001] The invention discloses an isosteviol sulfonate silver-based supramolecular gel, its preparation method and its application in the preparation of nano-silver, belonging to the field of functional materials. Background technique [0002] Nano-metal particles are ultra-fine metal particles with a size less than 100nm, which is an important research direction in nanoscience. Nano-silver has good optical, mechanical, thermal and biological activities, so it has broad application prospects in optical equipment, biomedicine, high-performance electrode materials, coatings, conductive pastes, sensors and other fields. The preparation of nano metal particles generally includes physical grinding method, inert gas condensation method, plasma method, biological reduction method, inverse microemulsion method and liquid phase reduction method. In the preparation method reported at present, there are shortcomings such as uneven particle size and easy agglomeration o...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00C07C309/27C07C303/32
CPCB22F9/24C07C309/27B82Y30/00C07C2603/86B22F1/07
Inventor 张涛白素平房立真樊高省王克杰邱培勇王亚坤吕洁丽张明亮
Owner XINXIANG MEDICAL UNIV
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