Synthesis and characterization of photo- and pH-responsive nanoparticles containing amino-substituted azobenzene

Qian Tang; Xianzhu Meng; Hongbo Jiang; Tianyou Zhou; Chengbin Gong; Xiangkai Fu; San-Qiang Shi

doi:10.1039/c0jm01235a

Synthesis and characterization of photo- and pH-responsive nanoparticles containing amino-substituted azobenzene

Qian Tang, Xianzhu Meng, Hongbo Jiang, Tianyou Zhou, Chengbin Gong, Xiangkai Fu, San-Qiang Shi

Research output: Journal article publication › Journal article › Academic research › peer-review

38 Citations (Scopus)

Abstract

A novel dual responsive nanomaterial sensitive to both photo- and pH stimuli has been successfully developed. The polymer-based nanoparticles were fabricated from a specially designed photo- and pH-responsive amino-substituted azobenzene monomer, 4-amino-4′-methacrylatylazobenzene (AMAAB), via free radical polymerization with trimethylolpropane trimethacrylate (TRIM) cross-linkers. The trans-cis photoisomerization properties of AMAAB were retained after incorporation into the rigid three-dimensional cross-linked polymer matrix. The TRIM/AMAAB molar ratio significantly influenced the kinetics of the trans-cis photoisomerization. The nanoparticles also possessed good pH-responsive properties. The change in absorbance with media pH was monitored at 402 nm, and a "titration type" curve was obtained with a pKavalue of 0.61 ± 0.06. At this transition point, the color of the nanoparticle suspension changed colour from yellow to pink. Thermogravimetric analysis (TGA) indicated that the nanoparticles were thermally stable.

Original language	English
Pages (from-to)	9133-9139
Number of pages	7
Journal	Journal of Materials Chemistry
Volume	20
Issue number	41
DOIs	https://doi.org/10.1039/c0jm01235a
Publication status	Published - 7 Nov 2010

ASJC Scopus subject areas

General Chemistry
Materials Chemistry

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10.1039/c0jm01235a

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abstract = "A novel dual responsive nanomaterial sensitive to both photo- and pH stimuli has been successfully developed. The polymer-based nanoparticles were fabricated from a specially designed photo- and pH-responsive amino-substituted azobenzene monomer, 4-amino-4′-methacrylatylazobenzene (AMAAB), via free radical polymerization with trimethylolpropane trimethacrylate (TRIM) cross-linkers. The trans-cis photoisomerization properties of AMAAB were retained after incorporation into the rigid three-dimensional cross-linked polymer matrix. The TRIM/AMAAB molar ratio significantly influenced the kinetics of the trans-cis photoisomerization. The nanoparticles also possessed good pH-responsive properties. The change in absorbance with media pH was monitored at 402 nm, and a {"}titration type{"} curve was obtained with a pKavalue of 0.61 ± 0.06. At this transition point, the color of the nanoparticle suspension changed colour from yellow to pink. Thermogravimetric analysis (TGA) indicated that the nanoparticles were thermally stable.",

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AU - Tang, Qian

AU - Meng, Xianzhu

AU - Jiang, Hongbo

AU - Zhou, Tianyou

AU - Gong, Chengbin

AU - Fu, Xiangkai

AU - Shi, San-Qiang

PY - 2010/11/7

Y1 - 2010/11/7

N2 - A novel dual responsive nanomaterial sensitive to both photo- and pH stimuli has been successfully developed. The polymer-based nanoparticles were fabricated from a specially designed photo- and pH-responsive amino-substituted azobenzene monomer, 4-amino-4′-methacrylatylazobenzene (AMAAB), via free radical polymerization with trimethylolpropane trimethacrylate (TRIM) cross-linkers. The trans-cis photoisomerization properties of AMAAB were retained after incorporation into the rigid three-dimensional cross-linked polymer matrix. The TRIM/AMAAB molar ratio significantly influenced the kinetics of the trans-cis photoisomerization. The nanoparticles also possessed good pH-responsive properties. The change in absorbance with media pH was monitored at 402 nm, and a "titration type" curve was obtained with a pKavalue of 0.61 ± 0.06. At this transition point, the color of the nanoparticle suspension changed colour from yellow to pink. Thermogravimetric analysis (TGA) indicated that the nanoparticles were thermally stable.

AB - A novel dual responsive nanomaterial sensitive to both photo- and pH stimuli has been successfully developed. The polymer-based nanoparticles were fabricated from a specially designed photo- and pH-responsive amino-substituted azobenzene monomer, 4-amino-4′-methacrylatylazobenzene (AMAAB), via free radical polymerization with trimethylolpropane trimethacrylate (TRIM) cross-linkers. The trans-cis photoisomerization properties of AMAAB were retained after incorporation into the rigid three-dimensional cross-linked polymer matrix. The TRIM/AMAAB molar ratio significantly influenced the kinetics of the trans-cis photoisomerization. The nanoparticles also possessed good pH-responsive properties. The change in absorbance with media pH was monitored at 402 nm, and a "titration type" curve was obtained with a pKavalue of 0.61 ± 0.06. At this transition point, the color of the nanoparticle suspension changed colour from yellow to pink. Thermogravimetric analysis (TGA) indicated that the nanoparticles were thermally stable.

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Synthesis and characterization of photo- and pH-responsive nanoparticles containing amino-substituted azobenzene

Abstract

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