Composition of silicon dioxide - metal hud particles, and preparation method

A technology of nanocomposite and silica, which is applied in the preparation of nanocomposite silica-metal core-shell particles, in the field of nanocomposite silica-metal core-shell particles, which can solve the problems such as the degree of change is not obvious

Inactive Publication Date: 2007-10-10
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter how these pure metal particles change the particle size, the maximum ultraviolet absorption or scattering can only be below 520nm, and the degree of change is not obvious

Method used

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  • Composition of silicon dioxide - metal hud particles, and preparation method
  • Composition of silicon dioxide - metal hud particles, and preparation method
  • Composition of silicon dioxide - metal hud particles, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Synthesis of silica-based cores in core-shell particles

[0033] Add 50mL of absolute absolute ethanol and 3.0mL of ammonia (25%) into a 100mL clean beaker. Under stirring conditions, add 0.2mL (0.9mmol) of 99.999% pure ethyl orthosilicate to the solution. (TEOS), the solution becomes milky white turbid after about 15~30mim, continue to stir for 8h. Silica particles with an average particle diameter of 140 nm were obtained. Measure the surface charge and pH value of the solution with a dynamic light scattering instrument.

[0034] By adjusting the concentration of ammonia and the amount of TEOS, spherical silica particles with a particle size of 100-250 nm can be synthesized.

[0035] (2) Ammonification of silica surface

[0036] Take the silica particle suspension obtained in the above experiment for centrifugal separation (1000-2000rpm), discard the supernatant, add 10 mL of ethanol to the precipitate, and ultrasonically disperse for 5 min. Add 400uL of aminopropyltri...

Embodiment 2

[0044] (1) Synthesis of silica-based cores in core-shell particles

[0045] In a 100mL clean beaker, add 50mL of absolute absolute ethanol and 15.0mL of ammonia (5.0%). Under stirring, add 0.2mL (0.9mmol) of 99.999% pure ethyl orthosilicate to the solution. (TEOS), the solution becomes a translucent turbid liquid after about 15-30 minutes, and the stirring is continued for 8h. Silica particles with an average particle diameter of 100 nm were obtained.

[0046] Adjusting the amount of TEOS in Example 1 (1) to 0.4 mL and the amount of other reagents unchanged, after similar reactions, silica particles with an average particle size of 250 nm can be obtained.

[0047] Generally speaking, under the same dosage of other reagents, the lower the concentration of ammonia, the smaller the particle size of the obtained silica particles; the more the amount of TEOS, the larger the particle size of the obtained silica particles.

[0048] (2) Ammonification of silica surface

[0049] Take the s...

Embodiment 3

[0055] Take 1mL of the seed gold solution in the above example 1(4) and mix with 30mL of PCG solution. After stirring vigorously for 10 minutes, quickly add 3mL of formaldehyde solution (1%), continue stirring for 0.5h, and centrifuge at 3000~5000rpm. Separate and remove the nano metal particles that are not adsorbed on the surface of the seed gold, and repeat this operation at least 5 times. The resultant precipitate was re-dispersed in 5 mL of water by ultrasound. The concentration of nanoparticles in the solution was about 4×10 11 Pieces / mL. The particle size was measured by the transmission electric environment and the UV absorption was measured by the ultraviolet spectrometer, and the surface charge and the pH value of the solution, as well as the particle size and particle size distribution were measured by a dynamic light scattering instrument. The surface of the nano-silica is continuously wrapped with a layer of gold, and the thickness of the gold layer is about 5 nm. The...

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Abstract

A composite SiO2-metal nanoparticle with a core-shell structure for the photothermal therapy of cancer is composed of a SiO2 nanoparticle as core and a coated metal layer as shell, and has the maximal extinctivity (300-2000 nm in wavelength) and the maximal UV absorption (300-2000 nm in wavelength). It's preparing process features that a molecular cross-linking agent is used for cross-linking between SiO2 and metal layer, the metallic nanoparticles are physically adsorbed onto surface of SiO2 nanoparticle, and the solution of relative metal is chemically reduced to cover on the residual surface of SiO2 nanoparticle.

Description

Technical field [0001] The invention relates to a nano-composite silica-metal core-shell particle, in particular to a nano-composite silica-metal core-shell particle, especially a nano-core-shell particle with silica nano-particles as the core and at least one metal shell on the surface, and provides the nano-composite silica -The preparation method of metal core-shell particles belongs to the field of biomedicine technology of material science. Background technique [0002] As we all know, solid metal nanoparticles have special optical properties, namely plasmon resonance absorption. This kind of plasmon resonance absorption is caused by the coupling between the electrons in the metal and the instantaneous electromagnetic field. The wavelength of this kind of plasmon resonance absorption can be controlled by the particle size of the nanoparticles, thereby changing the wavelength of ultraviolet absorption and scattering caused by instantaneous electromag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C1/04
Inventor 罗淑芳刘顺英梁重时余家会
Owner EAST CHINA NORMAL UNIV
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