FTIR pellets are commonly used in spectroscopy for sample analysis, and their diameter is a critical parameter that affects the quality of the results. The typical diameter range for these pellets is between 3 mm and 13 mm, though the exact size may vary based on the FTIR equipment manufacturer's specifications. The pellets are usually made from a mixture of potassium bromide (KBr) and the sample material in a ratio of about 100:1, ensuring sensitivity and accuracy in the analysis. A standard load of 10 tonnes is often applied using a pellet die, typically 13 mm in diameter, to achieve the desired pellet density and transparency for infrared transmission.
Key Points Explained:
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Diameter Range of FTIR Pellets:
- The standard diameter for FTIR pellets ranges from 3 mm to 13 mm.
- This range accommodates different FTIR equipment models, as manufacturers may specify varying pellet sizes for optimal performance.
- Smaller diameters (e.g., 3 mm) are suitable for microsampling, while larger diameters (e.g., 13 mm) are common for general analysis.
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Material Composition and Ratio:
- Pellets are typically made from potassium bromide (KBr) mixed with the sample in a 100:1 ratio.
- This ensures the sample is sufficiently diluted to avoid signal saturation while maintaining sensitivity.
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Pellet Preparation and Pressure Requirements:
- A standard 10-tonne load is applied using an (ftir press)[/topic/ftir-press] or pellet die (often 13 mm in diameter) to compress the KBr-sample mixture.
- This pressure ensures the pellet is dense and transparent enough for infrared light transmission.
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Equipment-Specific Considerations:
- Always refer to the FTIR manufacturer's guidelines for exact pellet dimensions, as deviations can affect spectral quality.
- Some specialized applications may require non-standard pellet sizes or preparation methods.
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Practical Implications for Purchasers:
- When procuring an FTIR press or pellet dies, ensure compatibility with the required diameter (3–13 mm).
- Consider the sample volume and analysis needs—smaller pellets save material but may require more precise handling.
Understanding these factors ensures optimal pellet preparation, leading to reliable and reproducible FTIR results. Have you considered how pellet thickness might also influence your spectroscopic analysis?
Summary Table:
| Parameter | Details |
|---|---|
| Diameter Range | 3 mm to 13 mm (varies by equipment) |
| Material | Potassium bromide (KBr) + sample (100:1 ratio) |
| Pressure Applied | 10-tonne load via pellet die (typically 13 mm) |
| Key Considerations | Follow manufacturer guidelines; thickness affects transparency and signal. |
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