A kind of isosteviol metal gel and its preparation method and application

Abstract

The invention discloses an isosteviol sulfonate silver-based supramolecular gel, a preparation method thereof and an application thereof in the preparation of nano-silver, belonging to the field of functional materials. This type of gel is prepared from the natural product isosteviol through esterification, sulfonation and salt formation, and has a silver sulfonate structural fragment. The structure is shown in Formula 1, wherein R is an alkane group or an aromatic hydrocarbon group. This type of gel has good gel performance, the minimum gel concentration is as low as 0.2% w / v, and can prepare nano-silver in situ through a green and convenient photoreduction process. The preparation method of the gel system is simple, the cost is low, and the solvent can be recycled and reused. The prepared nano-silver particle size is uniform and the method is simple, which provides a convenient template for the preparation of nano-silver. Formula 1.

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...

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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

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