CO2 Systems for tire inflation

Werehatrack wrote:
Oops, you're right, CO2 is a larger molecule. If that was the only
criterion tha counted, then Xenon would be a better choice still, with
a molecular diameter that's significantly larger than any of those
mentioned.

I say we fill our tires with cholesterol.

--Blair
"Keep a supply with me at all times anyway."

wrote:

Honest, Peter cited a link a few months ago that explains
this. Here's the relevant section:

In the "Polymer Handbook" (Ed. Brandrup & Immergut, 2nd Ed.
1975. Wiley), page III-230, it says:

'The permeation of small molecules through flawless polymer
films occurs by the consecutive steps of solution of
permeant in the polymer and diffusion of the dissolved
permeant.'

Fascinating. This was for latex balloons - I wonder how butyl tubes
compare? Or even polyurethane (if they're still made)?

wrote:

Honest, Peter cited a link a few months ago that explains
this. Here's the relevant section:

In the "Polymer Handbook" (Ed. Brandrup & Immergut, 2nd Ed.
1975. Wiley), page III-230, it says:

'The permeation of small molecules through flawless polymer
films occurs by the consecutive steps of solution of
permeant in the polymer and diffusion of the dissolved
permeant.'

Fascinating. This was for latex balloons - I wonder how butyl tubes
compare? Or even polyurethane (if they're still made)?

On Sun, 17 Oct 2004 04:05:20 GMT, Blair P. Houghton wrote:

Werehatrack wrote:
Oops, you're right, CO2 is a larger molecule. If that was the only
criterion tha counted, then Xenon would be a better choice still, with
a molecular diameter that's significantly larger than any of those
mentioned.

I say we fill our tires with cholesterol.

Why stop there? Use a massively cross-linked polymer; potentially,the
entire space could be enclosing just one very large molecule. It
would ride a bit rough, though.
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

On Sun, 17 Oct 2004 04:05:20 GMT, Blair P. Houghton wrote:

Werehatrack wrote:
Oops, you're right, CO2 is a larger molecule. If that was the only
criterion tha counted, then Xenon would be a better choice still, with
a molecular diameter that's significantly larger than any of those
mentioned.

I say we fill our tires with cholesterol.

Why stop there? Use a massively cross-linked polymer; potentially,the
entire space could be enclosing just one very large molecule. It
would ride a bit rough, though.
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

foldedpath wrote:

Someone with a couple of extra wheels sitting around should try filling one
with air, and the other with CO2 to the same pressure. Then let 'em sit for
a week or two, and compare the pressure loss.

One of my bikes has Continental Sprinter sew-ups, and the
front one has a slow leak. Starting from the same PSI, the
tire goes flat in about two days with pumped-in room air,
and about three days with CO2.

Needless to say, your mileage may vary.


Larry Coon
University of California

foldedpath wrote:

Someone with a couple of extra wheels sitting around should try filling one
with air, and the other with CO2 to the same pressure. Then let 'em sit for
a week or two, and compare the pressure loss.

One of my bikes has Continental Sprinter sew-ups, and the
front one has a slow leak. Starting from the same PSI, the
tire goes flat in about two days with pumped-in room air,
and about three days with CO2.

Needless to say, your mileage may vary.


Larry Coon
University of California

Werehatrack wrote:
On Sun, 17 Oct 2004 04:05:20 GMT, Blair P. Houghton wrote:

Werehatrack wrote:
Oops, you're right, CO2 is a larger molecule. If that was the only
criterion tha counted, then Xenon would be a better choice still, with
a molecular diameter that's significantly larger than any of those
mentioned.

I say we fill our tires with cholesterol.

Why stop there? Use a massively cross-linked polymer; potentially,the
entire space could be enclosing just one very large molecule. It
would ride a bit rough, though.

I wonder what you could charge for tires based on this:

http://www.nanotech-now.com/ucb-release-08262002.htm

--Blair
"Enough to fill them with Angelina Jolie's
old farts..."

Werehatrack wrote:
On Sun, 17 Oct 2004 04:05:20 GMT, Blair P. Houghton wrote:

Werehatrack wrote:
Oops, you're right, CO2 is a larger molecule. If that was the only
criterion tha counted, then Xenon would be a better choice still, with
a molecular diameter that's significantly larger than any of those
mentioned.

I say we fill our tires with cholesterol.

Why stop there? Use a massively cross-linked polymer; potentially,the
entire space could be enclosing just one very large molecule. It
would ride a bit rough, though.

I wonder what you could charge for tires based on this:

http://www.nanotech-now.com/ucb-release-08262002.htm

--Blair
"Enough to fill them with Angelina Jolie's
old farts..."

ive got an innovations ultraflate plus and its very good and simple t
use, it gets the job done and is a reasonable size

--
philhudso