Tracing the Chemical Oxidation Process of Single-walled Carbon Nanotubes by Silver Nanoparticles

PAM/TiO 2 composite microspheres with hierarchical surface structures were synthesized by the reaction between tetrabutyl titanate (TBOT) located within porous polyacrylamide (PAM) microgels and water in a moist atmosphere. The morphology and composition of the composite microspheres were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FI-IR), X-ray diffraction (XRD), N 2 absorption analysis, and mercury porosimetry, respectively. The results indicated that the composite microspheres, with different hierarchical surface morphologies, could be obtained by controlling the cross-linking degree of the porous PAM microgels, the relative humidity of the gas phase, the amount of residual impregnation liquid, and the TBOT concentration in the porous PAM microgels. Although the surface morphologies of the composite microspheres are varied, the morphologies are typically divided into three categories: (1) wrinkled surfaces covered with large dense TiO 2 particles; (2) porous structures sparsely suffused with large TiO 2 particles along the fringes and inner walls of the porous channels; and (3) macroporous surfaces with small TiO 2 particles distributed ubiquitously. The incorporation of TiO 2 particles into PAM microgels resulted in an obvious increase in specific surface area, and the pore size distribution of the microspheres depended strongly on the size of TiO 2 particles. The method described herein provides a potential way for finetuning the morphology and surface property of composite microspheres. Additionally, this method can be used to fabricate various composite materials through altering the precursor and/or polymeric microgel template.

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Tracing the Chemical Oxidation Process of Single-walled Carbon Nanotubes by Silver Nanoparticles

Cited by 4 publications

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Electrochemiluminescence revealing that HNO3-oxidized single-walled carbon nanotubes are essentially tubular graphene quantum dot-nanoassemblies

Electrochemiluminescence revealing that HNO3-oxidized single-walled carbon nanotubes are essentially tubular graphene quantum dot-nanoassemblies

Surface activated carbon nanospheres for fast adsorption of silver ions from aqueous solutions

Synthesis of PAM/TiO₂ Composite Microspheres with Hierarchical Surface Morphologies

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Tracing the Chemical Oxidation Process of Single-walled Carbon Nanotubes by Silver Nanoparticles

Cited by 4 publications

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Electrochemiluminescence revealing that HNO3-oxidized single-walled carbon nanotubes are essentially tubular graphene quantum dot-nanoassemblies

Electrochemiluminescence revealing that HNO3-oxidized single-walled carbon nanotubes are essentially tubular graphene quantum dot-nanoassemblies

Surface activated carbon nanospheres for fast adsorption of silver ions from aqueous solutions

Synthesis of PAM/TiO2 Composite Microspheres with Hierarchical Surface Morphologies

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Synthesis of PAM/TiO₂ Composite Microspheres with Hierarchical Surface Morphologies