Carbon nanodot-polyacrylic acid composite hydrogel, and method for preparing and formulation for forming the same

Patent metadata

Field	Value
Publication number	US-12415952-B2
Application number	US-202217881266-A
Country	US
Kind code	B2
Filing date	Aug 4, 2022
Priority date	Sep 24, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

Disclosed herein is a carbon nanodot-polyacrylic acid composite hydrogel including a polyacrylic acid-based gel matrix having carboxyl groups, and a plurality of fluorescent carbon nanodots having amino groups on surfaces thereof. The fluorescent carbon nanodots are formed by subjecting polyethylenimine and hydrochloric acid to a hydrothermal reaction, and are distributed in the polyacrylic acid-based gel matrix. The amino groups of the fluorescent carbon nanodots are covalently bonded with the carboxyl groups of the polyacrylic acid-based gel matrix. Also disclosed herein are a method for preparing and a formulation for forming a carbon nanodot-polyacrylic acid composite hydrogel.

First claim

What is claimed is:

1. A carbon nanodot-polyacrylic acid composite hydrogel, comprising:
a polyacrylic acid-based gel matrix having carboxyl groups; and
a plurality of fluorescent carbon nanodots having amino groups on surfaces thereof,
wherein the fluorescent carbon nanodots are formed by subjecting polyethylenimine and hydrochloric acid to a hydrothermal reaction, and are distributed in the polyacrylic acid-based gel matrix, the amino groups of the fluorescent carbon nanodots being covalently bonded with the carboxyl groups of the polyacrylic acid-based gel matrix.

2. The carbon nanodot-polyacrylic acid composite hydrogel as claimed in claim 1 , wherein the fluorescent carbon nanodots are present in an amount ranging from 2 wt % to 3 wt % based on a total weight of the carbon nanodot-polyacrylic acid composite hydrogel.

3. The carbon nanodot-polyacrylic acid composite hydrogel as claimed in claim 1 , wherein the polyacrylic acid-based gel matrix is formed by subjecting acrylic acid and an initiator to a polymerization reaction.

4. The carbon nanodot-polyacrylic acid composite hydrogel as claimed in claim 3 , wherein the polymerization reaction is performed at a temperature ranging from 25° C. to 60° C. for a time period ranging from 5 minutes to 2 hours.

5. The carbon nanodot-polyacrylic acid composite hydrogel as claimed in claim 1 , wherein the hydrothermal reaction is performed at a temperature ranging from 220° C. to 260° C. for a time period ranging from 8 hours to 12 hours.

6. A method for preparing a carbon nanodot-polyacrylic acid composite hydrogel, comprising:
mixing a plurality of fluorescent carbon nanodots having positively charged amino groups on surfaces thereof with acrylic acid and an initiator so as to form a hydrogel-forming mixture; and
subjecting the hydrogel-forming mixture to a polymerization reaction,
wherein the fluorescent carbon nanodots are formed by subjecting polyethylenimine and hydrochloric acid to a hydrothermal reaction.

7. The method as claimed in claim 6 , wherein the polymerization reaction is performed at a temperature ranging from 25° C. to 60° C. for a time period ranging from 5 minutes to 2 hours.

8. The method as claimed in claim 6 , wherein the hydrothermal reaction is performed at a temperature ranging from 220° C. to 260° C. for a time period ranging from 8 hours to 12 hours.

9. A formulation for forming a carbon nanodot-polyacrylic acid composite hydrogel, comprising:
a plurality of fluorescent carbon nanodots having positively charged amino groups on surfaces thereof;
acrylic acid; and
an initiator,
wherein the fluorescent carbon nanodots are formed by subjecting polyethylenimine and hydrochloric acid to a hydrothermal reaction.

Assignees

• Univ Southern Taiwan Sci & Tec

Inventors

• Chen Wei-Yu
• Chen Cheng-Ho
• Zhou en-yu
• Chang Hui-Shan
• Huang Chao-Wei
• Chou Han-Yi
• Yang Yueh
• Zhu Guan-Zhu

Classifications

• C08K3/24

  Acids; Salts thereof {(C08K3/16 takes precedence)} · CPC title

• B82Y30/00

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

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title