Effect of degassing on particle size

  • Thread starter Thread starter kasse
  • Start date Start date
  • Tags Tags
    Particle
Click For Summary
SUMMARY

The discussion focuses on the effect of degassing on the particle size of polluting dust particles, specifically analyzing the specific surface area (Asp) determined by gas adsorption. After treatment under vacuum at different temperatures, the calculated radii of the particles are 243 nm for 4 hours at 200 °C and 485 nm for 8 hours at 25 °C. The increase in particle size is attributed to the adsorption of gas particles, which leads to the growth of the particles as they accumulate gas molecules on their surfaces.

PREREQUISITES
  • Understanding of gas adsorption principles
  • Knowledge of particle size measurement techniques
  • Familiarity with vacuum treatment processes
  • Basic concepts of monodisperse spheres and density calculations
NEXT STEPS
  • Research gas adsorption isotherms and their implications on particle size
  • Explore vacuum treatment methods and their effects on material properties
  • Study the relationship between specific surface area and particle size in materials science
  • Investigate the impact of temperature on gas adsorption and particle growth
USEFUL FOR

Researchers in materials science, environmental scientists studying particulate matter, and professionals involved in the characterization of dust particles and their properties.

kasse
Messages
383
Reaction score
1
The specific surface area of polluting dust particles has been determined by gas adsorption:

Treatment__________________Asp (m2g-1)
4 h under vacuum at 200 °C_____5.61
8 h under vacuum at 25 °C_____2.81


Assume that they are monodisperse spheres of density r = 2.2 g/cm3. Calculate the radius of the particles.
Propose an explanation for the effect of degassing on particle size.

The radia are 243 nm and 485 nm, but what is the explanation?
 
  • Like
Likes   Reactions: Daga
Physics news on Phys.org
You know the rules. What thoughts do you have on the question?
 
When particles adsorb gas particles, they grow larger?
 
Last edited:

Similar threads

Fluid Mechanics, Particle Size, Bouyouncy Force
  • · Replies 16 ·
Replies
16
Views
3K
Undergrad Questions about Negative Pressure and Vacuum Energy
  • · Replies 5 ·
Replies
5
Views
3K
How many 0.3 micron particles in 0.1L volume of room air?
  • · Replies 2 ·
Replies
2
Views
5K
Undergrad Some questions about Cosmic Inflation
  • · Replies 4 ·
Replies
4
Views
5K
How Can Plasma Be Created and Ignited in Toroidal Fusion Reactors?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate What are the effects of Hawking radiation on black holes?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Equivalence of the 'expanding space' & 'kinematic' paradigms
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Uniqueness of deSitter spacetime and the Standard Model (hints from two papers)
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Ball Lightning Debunk, New Proposal
  • · Replies 1 ·
Replies
1
Views
5K
Graduate Sifting through the first quarter 2010 papers
  • · Replies 2 ·
Replies
2
Views
3K