Consumables and Accessories for Solid-State NMR
Rotors and Caps for Bruker®, Varian® and Doty® MAS-NMR Zirconia MAS Rotors and Caps
Manufactured from the highest purity Zirconia, Wilmad’s MAS Rotors provide the NMR
spectroscopist with the ultimate alternative for analysis of solid samples. The need to solvate solid samples is eliminated. They are available for most current solid state NMR spectrometers.
Wilmad MAS Rotors are carefully examined for material irregularities by optical methods before and after the precision machining process. Without overspinning, each rotor is spin tested to only the highest specified spinning speed. High precision (which becomes a necessity for proper spinning performance) is maintained in the manufacture of the end caps. Most end caps are fitted with O-rings for better sealing. Some caps have axial holes for venting.
Advantages of Zirconia Rotors
• Most homogeneous ceramic material
• Wilmad’s Zirconia Rotor Body has higher strength (1,000 MPa, greater than Si3N4)
• Highest spinning speed (up to 12 kHz for 7 mm O.D. rotors)
• High precision superior finish (0.05 μm mirror gloss)
For Operating Caps: No special tools are needed to put in or take out of rotor. They should NOT be pressed in as this may damage the O-ring. Ensuring the cap shaft and the rotor are aligned, cap should be screwed in; when the cap is in completely it should be turned back slightly (approximately 1/4 turn). Remove in the same fashion.
Pyrex MAS Rotor Inserts
Our Pyrex® MAS Rotor Inserts are designed for air-sensitive samples and semi-solid samples such as gels or highly viscous liquids. Sample can be sealed into the insert tube by heat-sealing with a torch or applying a small drop of epoxy (we recommend E-6000® Jewelry and Craft Adhesive) to the constricted part as shown below. After the epoxy is set and dry (24 hours) the sealed insert is cut through the constriction with a glass saw.
Using a small funnel (p/n 815), powder samples can be packed into the insert. Gelatinous samples can be warmed and transferred to the insert using a syringe.
Note: A glove box may be needed for the sealing of air-sensitive samples.
Pyrex Tubes for Varian NanoProbes
Wilmad’s Tubes for Varian® NanoProbe are constructed of Pyrex® glass for NMR analysis of
solids and semi-solids. This product is specially machined at close tolerances which allows the
tube to operate at around 2.5 kHz rotating speed.
• Each cap has an axial hole for venting air from the tube.
• A small screw plug is optional for closing the hole in experiments to prevent evaporation and
• Air-tight O-ring seals are optional on caps and plugs.
• Three Volumes are available:
110 μl – each consisting of a Pyrex® tube and a cap (Ertalyte or Kel-F®)
60 μl and 40 μl – each consisting of a Pyrex® tube, a cap and a plug (Ertalyte or Kel-F®)
Overall Size – 4 mm O.D. x 22.5 mm Length
Stainless Steel Micro-Spatula
Getting a tiny powder sample into any tube larger than 4 mm O.D. tube should never be a struggle again. Unlike ordinary spatulas, Wilmad’s Stainless Steel NMR Spatula fits into the most common NMR tubes. Add or remove samples easily, (including freeze-dried); scoop samples with the round end or pry stiff samples with the sharp edged flat end.