This title slide introduces a GPAT revision session on Micromeritics & Powder Rheology. It highlights high-yield advanced topics including diameters, means, particle size distribution (PSD), flow, compaction, and MCQs.

GPAT Revision: Micromeritics & Powder Rheology

High-Yield Advanced Topics: Diameters, Means, PSD, Flow, Compaction & MCQs

Source: GPAT Revision Summary Sheet

The "Revision Agenda" slide outlines key topics for review, including Equivalent Diameters & Mean Sizes, and Specific Surface Area & Comminution Laws. It also covers Particle Size Distribution & Flow Properties, along with Packing, Compaction Equations & GPAT Traps.

Revision Agenda

1. Equivalent Diameters & Mean Sizes
2. Specific Surface Area & Comminution Laws
3. Particle Size Distribution & Flow Properties
4. Packing, Compaction Equations & GPAT Traps

Source: GPAT Revision Summary Sheet: Micromeritics and Powder Rheology

This section header slide, titled "Equivalent Diameters & Mean Particle Size" (Section 02), introduces key concepts in particle analysis. It highlights essential diameters, along with formulas and calculations for mean particle size.

Equivalent Diameters & Mean Particle Size

02

Equivalent Diameters & Mean Particle Size

Key diameters, mean particle size formulas & calculations

Source: GPAT Revision Summary Sheet

The slide presents a table of particle size mean formulas, including Dn (number-average diameter: Σni di / Σni), Dv (volume-surface diameter: Σni di⁴ / Σni di³), D[4,3] (De Brouckere volume mean: same as Dv), and D[3,2] (Sauter surface-volume: Σni di³ / Σni di²), with descriptions and calculation tips. It highlights common uses like laser diffraction default for De Brouckere and volume distribution for Dv.

Particle Size Means Formulas

Source: GPAT Micromeritics Revision

This section header slide introduces the topic of Specific Surface Area and Comminution. It features the subtitle "Formulas, Laws & GPAT Revision Essentials," highlighting key concepts for review.

Specific Surface Area & Comminution

Specific Surface Area & Comminution

Formulas, Laws & GPAT Revision Essentials

Source: GPAT Revision Summary Sheet

The slide presents a table of comminution laws, including Rittinger (E = K(1/D₂ - 1/D₁) for fine grind), Kick (E = K ln(D₁/D₂) for coarse reduction), and Bond (E = K(1/√D₂ - 1/√D₁) for medium grind). It outlines the energy equations and primary applications for each law in particle size reduction processes.

Comminution Laws Table

Source: GPAT Revision: Micromeritics

The slide covers key powder properties and models related to Flow, Packing, and Compaction. It lists flow metrics like angle of repose, Carr's index, and Hausner ratio; packing via bulk/tap density; and compaction equations including Heckel (ln(1-E) = K·P + A) and Kawakita (Pn/P₀ = 1/(1 + a·Pn)).

Flow, Packing & Compaction

• Flow: Angle of repose, Carr's index, Hausner ratio
• Packing: Bulk/tap density
• Heckel: ln(1-E) = K·P + A
• Kawakita: Pn/P₀ = 1/(1 + a·Pn)

Source: GPAT Micromeritics Revision

The GPAT Traps & MCQ Tips slide outlines key pitfalls and strategies for pharmaceutical topics, including avoiding unweighted averages in mean size calculations, matching laws like Kick and Rittinger to grind types, and identifying compaction plots via Heckel equations. It also covers flow angle benchmarks (<20° excellent, >40° poor), Heckel equation details (Py = 1 - exp(-kP)), and Kawakita model matching.

GPAT Traps & MCQ Tips

Source: Micromeritics Revision