Surface morphology of nanostructured polymer-based activated carbons

Area of Science:

• Materials Science
• Physical Chemistry
• Nanotechnology

Background:

• Characterizing microporous materials is crucial for applications in adsorption and catalysis.
• Highly aromatic polymers serve as precursors for advanced carbon materials.
• Understanding pore structure at the nanoscale is essential for material performance.

Purpose of the Study:

• To characterize the surface features of microporous carbon materials derived from aromatic polymers.
• To determine the pore size distribution, surface area, and volume of these activated carbons.
• To develop and apply advanced analytical methods for detailed porous texture extraction.

Main Methods:

• Nitrogen adsorption (BET, DR, HK, NLDFT methods).
• Small-angle X-ray scattering (SAXS) with modified Porod's law and fractal analysis.
• Atomic force microscopy (AFM) with Fourier transform for pore size quantification.

Main Results:

• Activated carbons exhibit high surface areas (up to 4000 m²/g) and significant micropore volumes (up to ~1.75 mL/g).
• Average pore sizes were found to be in the range of 10-20 angstroms.
• SAXS analysis successfully extracted porous texture using a modified equation, and AFM provided statistical pore size data.

Conclusions:

• The combined techniques provide a comprehensive characterization of nanostructured activated carbons.
• The developed SAXS analysis method is effective for determining the porous texture of these materials.
• These highly microporous carbons possess properties suitable for various advanced applications.