Random sequential adsorption

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/random-sequential-adsorption

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the process type?Irreversible, random sequential adsorption
2. What is the mathematical foundation?Early models include Flory's polymer attachment and Rényi's car-parking problem
3. Why does the sticking of particles slow down over time?At first many spots are free, so particles stick quickly. As the surface gets crowded, new particles would overlap, so they are rejected, and the process slows until it reaches a maximum coverage.
4. How does the shape of particles affect how many can fit on a surface?Circular disks can cover about 54.7% of a surface. Rods or uneven shapes can fit much less, while having many sizes lets smaller ones fill gaps and increase the total coverage.

Irreversible Adsorption: Particles attach to a surface and cannot detach or move once fixed.
Saturation Coverage: The asymptotic limit of the fraction of surface area occupied by adsorbed particles.
Polydispersity: A distribution of particle sizes within a sample, as opposed to monodispersity (uniform size).