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Method for phase transferring and three-dimensional assembling of precious metal nano-particles

A technology of nanoparticles and precious metals, which is applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of long equilibration time and limited application range, and achieve the effect of short equilibration time, expanded application scope and simple operation process

Inactive Publication Date: 2014-01-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(Lu, Zhenda; Gao, Chuanbo; Zhang, Qiao; Chi, Miaofang; Howe, Jane Y.; Yin, Yadong. Direct Assembly of Hydrophobic Nanoparticles to Multifunctional Structures, Nano Letters (2011), 11(8), 3404-3412 ) In addition, the above-mentioned method only shows a good adhesion effect on small particles below 10nm, thus greatly limiting its application range
[0003] Recently, many scholars have devoted themselves to transferring water-soluble nanoparticles from the water phase to the oil phase in order to obtain oil-soluble nanoparticles, and then these methods use toxic solvents such as ionic liquids and dodecyl mercaptan. In addition, these methods only Can transfer spherical particles below 18nm mainly nanoparticles, and its equilibration time is also very long

Method used

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  • Method for phase transferring and three-dimensional assembling of precious metal nano-particles
  • Method for phase transferring and three-dimensional assembling of precious metal nano-particles
  • Method for phase transferring and three-dimensional assembling of precious metal nano-particles

Examples

Experimental program
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Effect test

Embodiment 1

[0090] Embodiment 1, utilize surfactant two (amino ethyl acyl methyl ethyl) octadecylamine (C 18 N 3 ) phase-transfer the gold nanorods

[0091] The original solution of gold nanorods (4mL) was centrifuged and washed three times under the condition of centrifugal force of 8000g and 10min / time to remove excess CTAB during the preparation process, and 4mL of C with a concentration of 1mM was added to the centrifuged product. 18 N 3 Aqueous solution, which was ultrasonicated under the condition of 600W for 30s. The solution obtained above was mixed with 1% C 18 N 3 mixed with the chloroform solution, vibrated for 30s, and stood for 1 minute to complete the phase transfer, and the gold nanorods were transferred from the upper aqueous phase to the lower chloroform phase, as figure 1 (a) shown.

[0092] The morphology of gold nanorods in water phase and oil phase are as follows: figure 2 As shown in (a) and 2(b), it can be seen that the morphology hardly changes before and a...

Embodiment 2

[0093] Embodiment 2, utilize surfactant two (amino ethyl acyl methyl ethyl) octadecylamine (C 18 N 3 ) to transfer the nanogold flower phase

[0094] According to the steps of Example 1, only the nano-gold rods in Example 1 were replaced with nano-gold flowers, and the centrifugal force was replaced with 7000g to complete the phase transfer of the nano-gold flowers.

[0095] Such as figure 1 (b) shown. The morphologies of the nano-golden flowers in the water phase and the oil phase are as follows: figure 2 As shown in (c) and 2(d), it can be seen that the morphology hardly changes before and after the phase transition.

Embodiment 3

[0096] Embodiment 3, utilize surfactant two (amino ethyl acyl methyl ethyl) octadecylamine (C 18 N 3 ) to transfer the phase transfer of gold nanospheres

[0097] Mix the original solution of gold nanospheres (4mL) with a mass percent concentration of 1%C 18 N 3 mixed with the chloroform solution, vibrated for 30s, and stood for 1 minute to complete the phase transfer, and the gold nanospheres were transferred from the upper aqueous phase to the lower chloroform phase, as figure 1 (c) shown.

[0098] The morphologies of gold nanoparticles in water and oil phases are as follows: figure 2 As shown in (e) and 2(f), it can be seen that the morphology hardly changes before and after the phase transition.

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Abstract

The invention discloses a method for phase transferring and three-dimensional assembling of precious metal nano-particles. The method comprises the following steps that after centrifugation is carried out on the aqueous solutions of the precious metal nano-particles, the aqueous solutions of 2 (diethyl aminoethyl acyl methyl ethyl) octadecylamine are added to sediments acquired through the centrifugation for ultrasonication, obtained dispersion liquid and the organic solutions of the 2 (diethyl aminoethyl acyl methyl ethyl) octadecylamine are mixed and vibrated, standing is carried out, and the precious metal nano-particles are transferred from a water phase to an oil phase. Centrifugation is carried out on the precious metal nano-particles transferred to the oil phase for the first time, the organic solutions of the 2 (diethyl aminoethyl acyl methyl ethyl) octadecylamine are added to the sediments acquired through the centrifugation for the ultrasonication, then obtained dispersion liquid and the organic solutions of silicon dioxide balls decorated by sulfydryl are mixed and stirred, centrifugation is carried out for the second time, obtained sediments are the precious metal nano-particles after the three-dimensional assembling, and the three-dimensional assembling of the precious metal nano-particles is achieved. The method is simple in operation, balance time for the phase transferring is short, and repeatability and controllability are better.

Description

technical field [0001] The invention relates to a method for phase transfer and three-dimensional assembly of noble metal nanoparticles. Background technique [0002] In recent years, studies on the numerous applications of the exotic optical, electrical, and magnetic properties of noble metal nanoparticles in materials science have aroused intense interest. Early studies on the regulation of the physical properties of nanomaterials focused on controlling the composition, size, morphology, and dielectric constant of nanoparticles. In view of the importance of the coupling between particles in the assembly of nanoparticles and the controllability of the surface plasmon resonance intensity in functional materials, the assembly of nanoparticles has become a research hotspot. Among numerous assembly methods, 3D assembly supported by spherical colloidal particles such as silica is a typical example. However, since most of the silica balls with water-soluble amino heads on the s...

Claims

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Application Information

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IPC IPC(8): B82B3/00B82Y40/00
Inventor 江龙武俊文鲁闻生贾文峰
Owner INST OF CHEM CHINESE ACAD OF SCI
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