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Thread: small sphere or cylinder filled by a solvent

  1. #1 small sphere or cylinder filled by a solvent 
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    Hi there,
    I need to develop a RF circuit (coil detector, resonant circuit, low-pass filter, small preamp) to read out a signal emitted by a given solvent inside a strong magnetic field (the same principle applied to NMR).

    Everything is almost ready unless the small recipient in which the solvent should be contained.
    Ideally the recipient should be an empty glass ball, completely filled with the solvent (no air bubbles to prevent any magnetic inhomogeneity) with an external diameter close to 4-6 mm.
    As alternative I can consider a small cilinder, let say the same diameter and 10mm high, closed in both sides.

    The material is glass because the solvent should be aggressive (acetone, alchool, dimethylsulfoxide... typical in chemistry app), since any other material can interfere with the RF signal: that's why in NMR analysis the sample is quite often stored into a glass tube.

    Any idea on how to realize and fill a glass sphere or a cylinder?

    waiting for your brainstorming :-)
    max


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  3. #2  
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    Quote Originally Posted by PhDemon View Post
    It's a long time since I did any glassblowing and I've never had to make anything so small (at least not where tolerances in size were so crucial) - it was mostly just connecting tubes together for vacuum lines...

    One idea that popped in my head though is that you could use something like a culture cylinder:

    Glass Culture Cylinder Instructions

    There may be a problem with sealing both ends (from what I remember only one end is sealed) but I guess you could speak to the manufacturer supplier or try and sort something out yourself...
    Thanks PHD,

    yes I agree that the main problem is still in the size.
    I will have a look to the website you shown me, I think I can try to close the ends by same special glou...


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    Quote Originally Posted by max1m View Post
    I will have a look to the website you shown me, I think I can try to close the ends by same special glou...
    Apparently, it exploded before he could finish.

    I think this thread should be given a wreath and a day of silence in remembrance.
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  5. #4  
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    Quote Originally Posted by Neverfly View Post

    Apparently, it exploded before he could finish.

    I think this thread should be given a wreath and a day of silence in remembrance.
    Sincerely, I do not understand your sarcasm.
    I wrote or said something inappropriate?
    What do you have against my simple request for help?
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    Quote Originally Posted by max1m View Post
    Sincerely, I do not understand your sarcasm.
    I wrote or said something inappropriate?
    What do you have against my simple request for help?
    Oh, you're alive! I retract.
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  7. #6  
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    Quote Originally Posted by Neverfly View Post
    Oh, you're alive! I retract.
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