SPI Supplies^® Brand Silicon Nitride Membrane Window Slot Grids for TEM

For TEM applications requiring high tilt angles

Introduction:
Much has been said about the SPI Supplies Silicon Nitride Membrane Window Grids and we will not repeat that content here again.

Flatness and Smoothness:
Those working at the forefront of nanotechnology and who are using the SPI Supplies Brand of silicon nitride membrane window grids for studying self-assembling arrays are greatly concerned about "smoothness" which is part of the overall subject of "surface texture" which is defined in ANSI/ASME B46.1 as relating to surface roughness, waviness and lay". For the silicon nitride windows, the "waviness" or "flatness" is directly related to the flatness of the starting silicon wafer since the membrane itself is low stress nitride. But it is the question of surface roughness (or smoothness) that is of concern to those studying self-assembling arrays. We had an independent laboratory procure grids from SPI Supplies and from a competitive source and we can state with confidence that the surface smoothness of the SPI Supplies brand of membrane window grids is superior in every conceivable way. The RMS (Rg) is ~ 0.70 nm and the Mean Roughness (Ra) is ~ 0.47 nm. A more extensive description of the laboratory's finding will answer most other questions. Note of caution: We present these numbers in good faith but they are not presented from the perspective that they are product specifications. We believe they are fairly representative of current production and that specific lots might be slightly better or slightly worse. We also offer comparison information about surface roughness of other supposedly "smooth" surfaces.

Electron tomography:
The 2.0 mm length of the window makes this the ideal geometry for anyone doing high tilt electron tomography experiments. The longer slot is more difficult to make than a shorter (e.g. 1.5 mm) slot but anyone doing this kind of work will tell you immediately how much more useful is the longer 2.0 mm slot.

What other customers order when ordering silicon nitride membrane window grids:
A substantial number of membrane grid customer order tweezers (to safely pick them up). and additional grid storage boxes for storing the prepared grids.

Available products:

Silicon Nitride [CAS #7440-21-3]

200 µm Thick Frames (Window Size: 2 x 0.5 mm slot): Packs of 10

Thickness of membrane window	SPI #	Each Pack	Each Pack, 10+	In Stock
500 nm	4078SN-BA	$ 249.67	$224.70	No
200 nm	4079SN-BA	249.67	224.70	No
150 nm	4080SN-BA	249.67	224.70	Yes
100 nm	4081SN-BA	249.67	224.70	Yes
75 nm	4082SN-BA	322.49	290.24	Yes
50 nm	4083SN-BA	322.49	290.24	No
30 nm	4084SN-BA	395.31	355.78	Yes
20 nm	4085SN-BA	520.15	468.14	Yes

(20 nm product may contain pinholes and will be delivered with the assumption the customer knows and accepts this.)

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SPI Supplies® Brand Silicon Nitride Membrane Window Slot Grids for TEM

SPI Supplies^® Brand Silicon Nitride Membrane Window Slot Grids for TEM