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Questions and Answers
What is the general relationship between surface area and particle size?
What is the general relationship between surface area and particle size?
- A 10-fold decrease in surface area corresponds to a 10-fold increase in particle size.
- A 10-fold decrease in surface area corresponds to a 10-fold decrease in particle size.
- A 10-fold increase in surface area corresponds to a 10-fold decrease in particle size. (correct)
- A 10-fold increase in surface area corresponds to a 10-fold increase in particle size.
What happens to surface area when particle size decreases?
What happens to surface area when particle size decreases?
- It increases by a factor of 100.
- It remains the same.
- It increases by a factor of 10. (correct)
- It decreases by a factor of 10.
What is the effect of decreasing particle size on surface area?
What is the effect of decreasing particle size on surface area?
- It has no impact on surface area.
- It only affects the particle's density.
- It increases the surface area available for reactions. (correct)
- It reduces the surface area available for reactions.
What happens when particle size is reduced by a factor of 10?
What happens when particle size is reduced by a factor of 10?
What is the general trend observed when particle size changes?
What is the general trend observed when particle size changes?
What is the primary factor influencing the size of finer particles in a material?
What is the primary factor influencing the size of finer particles in a material?
What determines the size of larger particles in a material?
What determines the size of larger particles in a material?
What is the relationship between particle size and comminution method?
What is the relationship between particle size and comminution method?
How do the internal structure of a material and the comminution process interact?
How do the internal structure of a material and the comminution process interact?
What can be inferred about the relationship between particle size and material properties?
What can be inferred about the relationship between particle size and material properties?
What type of fracture pattern is typically observed in friable materials?
What type of fracture pattern is typically observed in friable materials?
What is the primary reason for the difficulty in milling materials with high moisture content?
What is the primary reason for the difficulty in milling materials with high moisture content?
What is the critical moisture content threshold beyond which milling becomes difficult?
What is the critical moisture content threshold beyond which milling becomes difficult?
What type of milling process is suitable for friable materials?
What type of milling process is suitable for friable materials?
What is the primary advantage of using friable materials?
What is the primary advantage of using friable materials?
What can be beneficial in producing a suspension that contains a metastable form of material?
What can be beneficial in producing a suspension that contains a metastable form of material?
What is a possible consequence of producing a suspension with a metastable form of material?
What is a possible consequence of producing a suspension with a metastable form of material?
What type of material is more likely to exhibit crystal growth and caking?
What type of material is more likely to exhibit crystal growth and caking?
What can occur when a suspension contains a metastable form of material?
What can occur when a suspension contains a metastable form of material?
What is the primary purpose of using wet milling in producing a suspension?
What is the primary purpose of using wet milling in producing a suspension?
What is a characteristic of the costs involved in ball milling?
What is a characteristic of the costs involved in ball milling?
What can be inferred about the economic viability of ball milling?
What can be inferred about the economic viability of ball milling?
What is a benefit of the low costs involved in ball milling?
What is a benefit of the low costs involved in ball milling?
What is a characteristic of the labor costs involved in ball milling?
What is a characteristic of the labor costs involved in ball milling?
What is a consequence of the low installation costs involved in ball milling?
What is a consequence of the low installation costs involved in ball milling?
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Study Notes
Particle Size and Surface Area
- A 10-fold decrease in particle size results in a 10-fold increase in surface area.
- Finer particle sizes correlate with the internal structure of the material.
- Larger particle sizes are influenced by the comminution process employed.
Characteristics of Friable Materials
- Friable materials, such as dried filter cake and sucrose, fracture along defined planes.
- Various milling methods include attrition, impact, and compression.
Moisture Content in Comminution
- Moisture levels exceeding 5% inhibit effective comminution, leading to a sticky mass.
- Wet milling can create suspensions that encourage metastable forms, potentially leading to crystal growth and caking.
Cost Efficiency of Ball Milling
- Ball milling techniques are associated with low installation, operational, and labor costs.
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