Preparation method of core-shell type cationic microgel-nano noble metal composite material

A composite material and microgel technology, which is used in the preparation of pH-sensitive core-shell cationic microgel-loaded nano-noble metal composite materials, can solve the problems of weak polymer reduction, low glass transition temperature, and easy film formation , to achieve the effects of shortening the transmission distance, improving catalytic efficiency and simple operation

Active Publication Date: 2015-10-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are that PDEAMA has a low glass transition temperature, is easy to form a film, and has poor thermal stability, and the reducibility of the polymer as a reducing agent is weak. The process of preparing nano-Au takes 24 hours, which takes a long time.

Method used

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  • Preparation method of core-shell type cationic microgel-nano noble metal composite material
  • Preparation method of core-shell type cationic microgel-nano noble metal composite material
  • Preparation method of core-shell type cationic microgel-nano noble metal composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 0.09g of SDS, add it into 45mL of water, sonicate for 10min, transfer it into a four-neck flask with a stirring device, add 0.6g of PEGMA (Mn≈2080), and pass through N 2 , 250r / min stirring and emulsifying for 20min.

[0037] Weigh 0.03g DVB, mix it with 2g DEAMA and 1g MMA, and ultrasonically mix it evenly. Add the mixed solution into a constant pressure dropping funnel, drop it into a four-neck flask at a dropping rate of 0.3 mL / min, stir for 2 hours to make it uniform, and raise the temperature to 65°C.

[0038] 0.03g (NH 4 ) 2 S 2 o 8 Dissolve it in 5mL of water, add it to a constant pressure dropping funnel, and drop it into a four-necked bottle at a rate of 0.25mL / min. After the dropwise addition, it was reacted for 12 hours to generate PMMA / PDEAMA microgel white emulsion.

[0039] The prepared PMMA / PDEAMA microgel was dialyzed with deionized water until the conductivity of the dialyzed aqueous solution no longer changed, so as to remove unreacted mono...

Embodiment 2

[0049] Weigh 0.10g of SDS, add 45mL of water, ultrasonic for 10min, transfer to a four-neck flask with a stirring device, add 0.5g of PEGMA (Mn≈2080), pass through N 2 , stirring and emulsifying at 180r / min for 30min.

[0050] Weigh 0.06g DVB, mix it with 2g VP, 1g MMA, and ultrasonically mix it evenly. Add the mixed solution into a constant pressure dropping funnel, drop it into a four-neck flask at a dropping rate of 0.3 mL / min, stir for 2 hours to make it uniform, and raise the temperature to 65°C.

[0051] 0.045g K 2 S 2 o 8 Dissolve it in 5mL of water, add it to a constant pressure dropping funnel, and drop it into a four-necked bottle at a rate of 0.25mL / min. After the dropwise addition, react for 12 hours to generate PMMA / PVP microgel emulsion.

[0052] The prepared PMMA / PVP microgel was dialyzed with deionized water until the conductivity of the dialyzed aqueous solution no longer changed, so as to remove unreacted monomers, macromolecular stabilizers and surfacta...

Embodiment 3

[0056] Weigh 0.12g of SDS, add it into 50mL of water, sonicate for 10min, transfer it into a four-necked flask with a stirring device, add 0.6g of PEGMA (Mn≈475), and pass N 2 , Stir and emulsify at 180r / min for 20min.

[0057] Weigh 0.03g EGDMA, mix it with 2g DEAMA and 1g MMA, and ultrasonically mix it evenly. Add the mixed solution into a constant pressure dropping funnel, drop it into a four-neck flask at a dropping rate of 0.3 mL / min, stir for 2 hours to make it uniform, and raise the temperature to 65°C.

[0058] Dissolve 0.03g of V-50 in 5mL of water, add it to a constant pressure dropping funnel, and drop it into a four-neck flask at a rate of 0.25mL / min. After the dropwise addition, it was reacted for 12 hours to generate PMMA / PDEAMA microgel white emulsion.

[0059] The prepared PMMA / PDEAMA microgel was dialyzed with deionized water until the conductivity of the dialyzed aqueous solution no longer changed, so as to remove unreacted monomers, macromolecular stabiliz...

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Abstract

The invention discloses a preparation method of a core-shell type cationic microgel-nano noble metal composite material, which includes preparing a pH responsive core-shell type cationic microgel by use of hydrophilic differences of two kinds of monomers through a one-step emulsion polymerization method, performing complexing of a noble metal precursor into the network structure of the cationic microgel through electrostatic interaction by using the cationic microgel as a reducing agent, and preparing the core-shell type cationic microgel-nano noble metal composite material with good pH responsibility and stability by using the confined effect of the microgel and the reducibility of tertiary amino groups on the microgel shell layers through a heating self-reduction method. The method is rapid in reaction and has no need of additional reducing agents; and the prepared composite material has application values in catalysis, medical diagnosis, biological imaging, drug controlled release, surface enhanced fluorescence, surface plasma resonance, sensors and other fields.

Description

technical field [0001] The invention belongs to the technical field of composite materials loaded with nano precious metal particles, and relates to a preparation method of a pH sensitive core-shell type cationic microgel loaded nano precious metal composite material. Background technique [0002] Nano-noble metals have the characteristics of large specific surface area, high surface energy, and strong adsorption capacity, and are widely used in many fields such as optics, electricity, magnetism, physics, chemistry, and thermodynamics. However, precisely because of the high surface energy, nano-noble metals have the problem of easy aggregation. It is necessary to add polymer stabilizers as templates or microreactors to overcome the problem of nano-metal agglomeration. [0003] Compared with templates such as branched, block and star polymers, the network structure of microgel provides a space for the nucleation and growth of heavy metals (confinement), and it is easy to obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/14C08L39/06C08K3/08C08F220/34C08F220/14C08F212/36C08F2/26C08F226/10C08F222/14C08L51/08C08F283/06
Inventor 申迎华李军磊申鑫张晓莲杜海燕邱丽戴胜
Owner TAIYUAN UNIV OF TECH
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