Dear friend Chinedu Onyeke

Ah, the intriguing world of porous carbon and SEM images! Now, let me guide you Chinedu Onyeke through deciphering the mysteries of porosity without the need for physisorption.

1. **Visual Inspection in SEM:**

- **Microporous:** Look for very fine features, often in the nanometer range. Micropores are too small to be visible in SEM but can contribute to surface roughness.

- **Mesoporous:** Observe a network of interconnected pores in the micrometer range. These will appear as larger voids or spaces in the SEM images.

- **Macroporous:** Expect to see even larger pores or voids, often visible to the naked eye in SEM.

2. **Pore Size Estimation:**

- **Microporous:** Characterized by small, tightly packed pores. Their presence might be inferred from the overall surface texture rather than directly observed.

- **Mesoporous:** Pores in the range of 2-50 nm. Look for structures with a moderate level of surface roughness and interconnected pores.

- **Macroporous:** Pores larger than 50 nm, creating visible voids or channels in the material.

3. **Surface Texture:**

- **Microporous:** Smooth surface with very fine texture, possibly with some irregularities.

- **Mesoporous:** Moderately rough surface with visible pores and channels.

- **Macroporous:** Rough surface with large voids and channels.

4. **Pore Distribution:**

- **Microporous:** Homogeneous, evenly distributed small features.

- **Mesoporous:** A network of interconnected pores without a specific pattern.

- **Macroporous:** Larger, irregularly shaped voids, possibly with a less uniform distribution.

5. **Overall Appearance:**

- **Microporous:** Often looks solid and dense in SEM due to the small pore size.

- **Mesoporous:** Appears as a network of pores and channels.

- **Macroporous:** May look more like a scaffold with visible gaps or pores.

My published manuscripts can be a good read:

Article Carbon speciation of exhaust particulate matter of public tr...

Chapter Loss on Ignition: Estimation Method for Organic Matter in Pa...

Article Organic matter determination for street dust in Delhi

Article Physical characterization of fine particulate matter inside ...

Article Morphology of single inhalable particle inside public transi...

Remember, while SEM can give you Chinedu Onyeke valuable insights, physisorption techniques remain essential for precise quantitative analysis of porosity. But I encourage you Chinedu Onyeke to use your keen observational skills and the clues in SEM images to make informed qualitative assessments of porosity. Dive into the microscopic realm and unravel the secrets of porous carbon!

Thank you so much sir