Method utilizing guanyl surface active agent micro emulsions to prepare nano-silver
A surfactant and nano-silver technology, which is applied in the field of synthesizing nano-silver, can solve problems such as the difficulty of separating cationic surfactants from nano-silver, and the difficulty of recycling surfactants, etc., and achieves easy industrialized large-scale production, easy control and operation safe effect
Inactive Publication Date: 2013-06-26
JIANGNAN UNIV
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problem that the traditional surfactant microemulsion is difficult to separate the cationic surfactant from the nano-silver in the post-treatment process of synthesizing the nano-silver, and the problem that the surfactant is difficult to recycle, and provides a kind of amidine-based surfactant Method for synthesizing nano silver by microemulsion
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[0014] Embodiment Example 1: Mix 0.1g N'-hexadecyl-N, N-dimethylacetamidinyl bicarbonate, 1.5g n-butanol, 5g n-heptane and ultrasonically shake for 30 minutes; the formed solution Divide into A and B equally, A solubilizes 0.02g0.05mol / L AgNO 3 Aqueous solution, B solubilized 0.02g0.05mol / L NaBH 4 Aqueous solution, ultrasonic vibration for 30 minutes to make A and B each form a clear and transparent microemulsion, then slowly add A to B, ultrasonic vibration reaction for 1 hour; layer, centrifuge, wash, and dry at 70°C to obtain silver nanoparticles;
[0015] Characterized by a transmission electron microscope (TEM), the nano silver synthesized in this embodiment is a single crystal, spherical, with a diameter of 2nm, and has a quantum confinement effect.
[0016] Implementation example 2
[0017] Embodiment Example 2: Mix 0.5g of N'-tetradecyl-N, N-dimethylacetamidinyl bicarbonate, 1.0g of n-hexanol, and 4.5g of n-heptane with ultrasonic vibration for 60 minutes; the forme...
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Abstract
The invention discloses a novel nano-silver particle preparation method and relates to a method utilizing N'-alkyl-N and N-dimethyl guanyl bicarbonate surface active agents to prepare micro emulsions and preparing nano-silver particles in the micro emulsion solution. The method includes the steps of preparing the guanyl bicarbonate surface active agent micro emulsions, utilizing the micro emulsions to solubilize silver nitrate and reductant aqueous solution, mixing the silver nitrate and the reductant aqueous solution to carry out reaction for several hours under ultrasound, heating a system or supplying the air, or nitrogen or other gases to carry out emulsion breaking and layering on the micro emulsions after reaction is completed, carrying out vacuum drying under 40-80 DEG C through centrifuging and washing to obtain the nano-silver particles. The method can be used for obtaining monodisperse nano-silver particles with the particle size of 5-100nm.
Description
technical field [0001] The invention relates to a method for synthesizing nano silver Background technique [0002] Nano-silver particles have the characteristics of noble metals, such as chemical stability, excellent electrical conductivity, and excellent catalytic activity; the antibacterial properties and nonlinear optical properties exhibited by the nanoparticles make them widely used in catalysts, glass and ceramic colorants, and dielectric materials. Materials, antibacterial materials and surface-enhanced Raman scattering technology have a wide range of applications. [0003] Microemulsion is an aggregate (self-assembly system) formed spontaneously by a certain amount of surfactants in an organic solvent, and is a thermodynamically stable mixture composed of several substances such as oil, water, and surfactants. It is transparent and single-phase continuous in the macroscopic state, but in the microscopic scale, it is formed by the dispersion of water cores wrapped i...
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IPC IPC(8): B22F9/24
Inventor 蒋建中崔哲何艳娥李解崔正刚
Owner JIANGNAN UNIV