StevieH Member

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  • StevieH

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    Just a thought. When the succesfull Mizuno meshes were handled after removal, I wonder if they were bent much, and if so, were they brittle?
  • StevieH

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    (Quote from JedRothwell)


    We discussed this back in July, when the R20 paper was first posted. Here's what I wrote in reply to Jed's earlier comment:

    Mohs hardness refers to the scratch resistance - the ability of harder material to scratch softer material.…
  • StevieH

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    Describes both work-hardening and annealing in Pd/Ag alloys - but pure Pd behaves the same way.

    Rolled thin Pd and Pd–Ag membranes for hydrogen separation and production



    LBettinali VViolante
    Show more https://doi.org/10.1016/S0360-3199(99)00044-0Get
  • StevieH

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    (Quote from StevieH)


    I believe someone did this. Also, they looked up the hardness of Pd and found that it varies more than we realized.
  • StevieH

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    (Quote from JedRothwell)

    Could it not also be the case that, per AlanG's work, they might not be getting effective scraper geometry by mesh preparation?

    Rather than assuming it is hard Pd that is the problem, has anyone actually tested it with an…
  • StevieH

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    helium: m= 4.0026 amu
    D2 m= 4.0282 amu
    Resolving them with a mass spectrometer is very tricky, very, very tricky.
    But if the residual gas is subjected to high frequency high voltage excitation (plasma globe supply)
    the optical spectra are as…
  • StevieH

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    Alan Smith

    Cute. I was thinking physical rather than chemical.

    Why bother at all with D2 when you can take it out of the equation.
  • StevieH

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    StevieH The cryo trap is filled with activated carbon grains and submerged in a dry-ice/alcohol bath at -78C - the D2 is adsorbed by the carbon, the He is not.
  • StevieH

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    (Quote from Alan Smith)

    I have been in discussion with MKS regarding the He/D2 issue. They tell me it is possible to resolve the 2 but it is tricky. It is down to differences in ionisation energy. It is more difficult to resolve small amounts of He in D2…
  • StevieH

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    (Quote from Cydonia)

    Sure, in some respects. The reason I put it together with surface topology though, is that there seems to be a deal of evidence that the step and terrace structure of ordered crystals is dimensionally in the right ball park for…
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    StevieH
    yes, I think surface topology should be very important but not mainly for absorption.
    Crystalline structure is something else. In positive experiments, an amorphous structure is often reported as for Japanese powders. Sputtering can help to make…
  • StevieH

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    Cydonia
    It looks like you don't like any kind of oxide present if you have removed NiO too.

    Do you reckon that the D2 dissociative adsorption is driven by surface topology/Ni crystal structure alone then? Assuming you are using D2 and agree with that as…
  • StevieH

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    StevieH
    Yes, i used an electron beam so before sputtering we removed full oxidation from Nickel surface by the same device but with Argon beam to remove oxygen.
    I don't share CaCO3 hypothesis.
  • StevieH

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    Cydonia

    Just a couple of questions for my own interest.

    I've noticed from previous posts that you are into sputtering. I was wondering if the type of sputtering process you use still allows the CaCO3 crystals to be present on the mesh?
    If so, does the…
  • StevieH

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    (Quote from Cydonia)

    The nanometer thickness may well be fine.

    Not sure about the uniform application though.

    Mizuno scored with very heterogeneous Pd application. His success could be down to hitting something random, but highly dimensionally sensitive.

  • StevieH

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    Alan Smith
    yes, i think the best way to be well uniform should be chemical plating, here by a beam we should have small thickness variations mostly we stay at nanometers level.

    (Quote from Alan Smith)

  • StevieH

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    Small comparison between manual depot on left vs sputtering on right.

  • StevieH

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    (Quote from JedRothwell)


    We already sent them an as-received mesh and a prepared mesh that did not seem to produce excess heat. So they should be able to do a comparative analysis.

    Someone else looked at a prepared mesh with an SEM suggested that the tap…
  • StevieH

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    Mass spec, reactor and a lot of messy-looking plumbing. Nearly ready to rumble, just waiting for cold trap parts (between reactor and mass spec) and also babying this through the next round of vacuum testing.
  • StevieH

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    The samples of the super-productive mesh are on their way to analysis. Thank goodness. That wasn't easy to arrange.