Polymer capsule having loaded thereon transition metal particles having excellent water dispersibility and stability, and method for preparing same

Patent metadata

Field	Value
Publication number	US-9707548-B2
Application number	US-201515303710-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	Apr 16, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

Provided are a polymer capsule loaded with transition metal particles having excellent water dispersibility and stability, and a method for preparing the same. Specifically, the polymer capsule loaded with transition metal particles according to the present invention includes a surface-modified polymer capsule surface-modified to thereby have a positive zeta potential in a dispersed state in water; and transition metal particles loaded on a surface of the surface-modified polymer capsule. In addition, a method for preparing a polymer capsule loaded with transition metal particles according to the present invention includes a) preparing a polymer capsule; b) surface-modifying the polymer capsule to prepare a polymer capsule having a positive zeta potential in a dispersed state in water; and c) sequentially adding a water-soluble transition metal precursor and a reducing agent to a water dispersion of the surface-modified polymer capsule obtained in step b).

First claim

The invention claimed is:

1. A method for preparing a polymer capsule loaded with transition metal particles, the method comprising:
a) preparing a polymer capsule by copolymerizing a compound represented by the following Chemical Formula 1 and a compound represented by the following Chemical Formula 2 with each other;
b) surface-modifying the polymer capsule to prepare a surface-modified polymer capsule having a positive zeta potential in a dispersed state in water; and
c) sequentially adding a water-soluble transition metal precursor and NaBH 4 or NaOH or a combination thereof to a water dispersion of the surface-modified polymer capsule obtained in step b):

in Chemical Formula 1, X is O, A 1 and A 2 are each independently —OR 1 , R 1 being independently a substituted or unsubstituted C2-C20 alkenyl group or a substituted or unsubstituted C2-C20 alkynyl group, B 1 and B 2 are each independently a substituted or unsubstituted C1-C10 alkylene group, and n is an integer of 4 to 20 , and
(HS) j —Z—(SH) k   [Chemical Formula 2]

in Chemical Formula 2, Z is a substituted or unsubstituted C2-C20 alkylene group, and j and k are each independently an integer of 1 to 3.

2. The method of claim 1 , wherein the surface-modified polymer capsule has a zeta potential of 60 to 90 mV.

3. The method of claim 1 , wherein the water-soluble transition metal precursor is an alkali metal-transition metal halide.

4. The method of claim 3 , wherein the number of moles of the added water-soluble transition metal precursor is 1 to 4 times based on the total number of moles of the compound represented by Chemical Formula 1 in step a).

5. The method of claim 1 , wherein in step a), a molar ratio of the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 is 1:40 to 60.

6. The method of claim 1 , wherein step b) includes:
b1) adding alkyl halide corresponding to a surface-modifier to a dispersion in which the polymer capsule is dispersed in alcohol and performing incubation; and
b2) obtaining the water dispersion of the surface-modified polymer capsule by purification using dialysis.

7. The method of claim 6 , wherein the number of moles of the added surface-modifier is 400 to 600 times based on the total number of moles of the compound represented by Chemical Formula 1 in step a).

8. The method of claim 1 , wherein surface-modification in step b) is performed by alkyl halide.

9. The method of claim 8 , wherein a sulfonium group is formed on a surface of the polymer capsule by the surface-modification.

10. The method of claim 1 , wherein transition metal nanoparticles formed on a surface of the polymer capsule in step c) have an average diameter of 1.5 to 3.5 nm.

Assignees

• Inst Basic Science
• Postech Academy-Industry Found

Inventors

• Kim Kimoon
• Yun Gyeongwon
• Hassan Zahid
• Lee Jiyeong
• Kim Jeehong
• Kim Nam Hoon
• Baek Kangkyun
• Hwang Iiha

Classifications

• B01J23/52 Primary

  Gold · CPC title

• B01J23/42

  Platinum · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• B01J33/00

  Protection of catalysts, e.g. by coating · CPC title

• C08J7/12

  Chemical modification · CPC title