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Title: 50nm or 200nm? How to Choose the Right SiN Membrane (Quick Guide)
50nm or 200nm? How to Choose the Right SiN Membrane (Quick Guide)
First, remember this rule of thumb:
The thinner the membrane → The easier it is for X-rays to pass through → But the easier it is to break.
The thicker the membrane → The stronger it is against pressure → But the more it absorbs soft X-rays.
Choosing the right membrane is all about balancing transparency versus durability.
Plain-English Comparison Table (Industry Standards)
Experiment Type | Recommended Thickness | Max Window Size | Reason |
Soft X-ray (C-edge, N-edge absorption) | 50–100nm | 1×1mm (50nm) / 1.5×1.5mm (100nm) | Soft photons struggle to penetrate thick membranes. |
Standard Transmission Imaging (0.5–2keV) | 100nm | 1.5×1.5mm | The "Goldilocks" zone for transmission vs. strength. |
Hard X-ray (>5keV), Fluorescence | 200–500nm | 2.5×2.5mm | Hard X-rays aren't bothered by thickness; strength is key. |
Liquid/Gas Cells (In-situ) | 200nm+ | 1.5×1.5mm | Pressure differences require a tough membrane. |
TEM Support Film (Specialized) | 10–50nm | 0.5×0.5mm | Electrons are even more sensitive to thickness than X-rays. |
Pressure Resistance (At 1 Atmosphere Differential)
50nm membrane: Safe for windows ≤1×1mm.
100nm membrane: Safe for windows ≤1.5×1.5mm.
200nm membrane: Safe for windows ≤2.5×2.5mm.
How to choose the Frame Size?
5×5mm: Most common, fits the majority of beamline stages.
7.5mm & 10mm: Used for large-field tomography scans.
Thickness: 200μm is standard. 381/525μm frames are for heavy-duty metal holders requiring frequent assembly/disassembly.
| Phone: 0512-67266051 |
| E-mail: sales@ywmems.com |
| Address: G202, No.338 Ruoshui Road,Suzhou Industrial Park, Jiangsu, China |
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