CryoNet #31967 - #31970

CryoNet - Mon 14 Sep 2009

    #31967: More on CAS freezing. [Leo]
    #31969: Laser cooling [John Clark]
    #31970: CAS freezing [Brian Wowk]

1 message(s) removed from digest due to low reputation.

Rate This Digest: http://www.cryonet.org/cgi-bin/rate.cgi?msg=31967%2D31970

Administrivia

To subscribe to CryoNet, send email to:
    [email protected]
with the subject line (not message _body_):
    subscribe
To unsubscribe, use the subject line:
    unsubscribe

To post a message to CryoNet, send your message to:
    [email protected]
(Note: A "Subject:" line starting the message body replaces
the "Subject:" line in the header.  This gives a second
opportunity to provide a meaningful subject line.)

Since all CryoNet messages are archived and accessible via WWW,
including search engines, make certain that your postings
reflect how you want the world to see you.

To retrieve past messages, send email to:
    [email protected]
with the message numbers in the subject line.
(Message 0003 describes the advanced syntax.)
You also can retrieve them via the CryoNet web page at URL:
    http://www.cryonet.org/

For administrative or other questions/suggestions, send email
to me at "[email protected]" with "cryonics" in the subject line.
    - Kevin Q. Brown


----------------------------------------------------------------------

Message #31967
From: "Leo" <[email protected]>
Subject: More on CAS freezing.
Date: Sun, 13 Sep 2009 13:12:34 +0200

There must be some truth behind this magnetic Freezing.

Its worth to dive in to this deeper, its potential a game changer.

 

Years ago we had some posts about something very similar.

 

http://www.google.com/search?q=%22magnetic%20resonance%20freezing%22%20site%3Awww.cryonet.org&hl=en&tbo=1

 

here is interesting article about it.

 

 

http://preventdisease.com/news/08/052308_freezing.shtml

 

some pieces out of it.

 

>Forty-seven researchers are experimenting with Owada's technology to preserve human organs. A group at Tokyo University is freezing mouse hearts with a technology similar to Owada's. Another group at Keio University is preserving nerve fibers. Owada predicts that the first defrosted organ transplant could happen within a decade.

And the already use it to store teeth 

>Toshitsugu Kawata, an associate professor of dentistry at Hiroshima University, is using Owada's system to run a commercial cryogenic tooth bank, with 1,600 teeth in stock. Under a tooth's hard enamel are softer layers with enough water in them to form harmful ice crystals when frozen. For $1,200 he'll keep your wisdom teeth safely on ice for 20 years. You can have them transplanted back for less than the cost of artificial implants. "It's like having a spare tire," he jokes.

The patent.

 

http://v3.espacenet.com/searchResults?locale=en_EP&PA=abi+hiroshima&ST=advanced&compact=false&DB=EPODOC&submitted=true

 

The site.

 

 

http://translate.google.com/translate?hl=en&sl=ja&u=http://www.teethbank.jp/&ei=ANGsSoadDpSlsAaJ9KjtBw&sa=X&oi=translate&resnum=1&ct=result&prev=/search%3Fq%3Dteehtbank.jp%26hl%3Den%26sa%3DG

 

If somebody here can find a CAS freezer, maybe he can put a glass off water in it and report the results to us.

 

Leo.

 


 Content-Type: text/html;

[ AUTOMATICALLY SKIPPING HTML ENCODING! ] 

Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=31967

----------------------------------------------------------------------

Message #31969
From: John Clark <[email protected]>
Subject: Laser cooling
Date: Sun, 13 Sep 2009 13:07:37 -0400

--Apple-Mail-19--323448988
	format=flowed;
	delsp=yes

In #31952 On Wed, 09 Sep 2009 hrhirsch <[email protected]> Wrote

> Laser cooling has taken an important step toward such practical
> applications as reducing temperatures rapidly to values near absolute
> zero according to an article in "Wired Science":
> www.wired.com/wiredscience/2009/09/lasercooling/. Although I used to
> be a physicist, I really don't understand how this works. Can someone
> enlighten me?

The idea is to tune a Laser beam to a frequency slightly below the  
quantum
absorption  frequency of an atom, if the atom is motionless or moving  
away
from the Laser it will not be able to absorb a photon from the Laser,  
but if
the atom is moving toward the Laser the frequency of the photon that  
the atom
sees will be shifted slightly higher due to the Doppler effect. The  
photon is
now right at the quantum absorption frequency, the atom will swallow  
it whole
including the momentum of the photon, this will slow the atom down.

Yes, now that the atom is excited and no longer in its ground state
eventually the atom will re emit the photon, but the direction is  
random,
it's just as likely to cool the atom further as heat it, so this has  
no net
effect on the cooling process. If you have 6 such Laser beams one for,
forward, backward, right, left, up, down, you can cool things to very  
close
to absolute zero.

> If practical, it might be just what we need for vitrification.

It's overkill, you don't need things THAT cold.

  John K Clark
--Apple-Mail-19--323448988

 Content-Type: text/html;

[ AUTOMATICALLY SKIPPING HTML ENCODING! ] 

Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=31969

----------------------------------------------------------------------

Message #31970
Date: Sun, 13 Sep 2009 22:15:01 -0700
Subject: CAS freezing
From: Brian Wowk <[email protected]>

       I wrote:

>> "One very simple demonstration of CAS freezing and how it prevents ice
>> crystal formation is that it can freeze a full glass bottle of water.
>> The water level remains the same, the glass does not break, and the
>> water is crystal clear except for a few bubbles."
>>
>> This strains credulity.

      Jeff David replied:

> The technical issue is whether pure water, if supercooled below its
> freexing point by 7 deg C/ 12.6 deg F while being prevented from
> "solidifying" into either an ordered crystalline solid (ice) or an
> amorphous solid (vitrified water), putatively as the result of the
> influence of an externally applied magnetic field, will upon sudden
> removal of the magnetic field, "flash solidify" into a vitrified (ie
> non-crystalline) state.

       It occurs to me that solidifying pure water into an amorphous
solid (vitrifying it) at the temperatures and pressures used by CAS is
physically impossible.  The reason is as follows.  We already know the
physical properties of amorphous (vitrified) water because it is
possible to vitrify pure water in the laboratory by cooling small
droplets very fast (about a million degrees Celsius per minute).  In
particular, we know the glass transition temperature of vitrified
water.  It is approximately -130 degC.  When a vitrified solid is
warmed above its glass transition temperature, it becomes liquid.
Therefore any vitrified water sample is going to turn to a liquid at a
temperature warmer than about -130 degC.  What happens when vitrified
water turns to liquid water at -130 degC?  It freezes into ice
practically instantly.

       Therefore, if we assume that ice formation is prevented by
electromagnetic energy in a CAS system at -20 degC, water will only be
able to exist in two states when the power is turned off.  It can only
exist as supercooled liquid, or exist as ice.  It cannot become an
amorphous solid because the temperature is a 100 degrees higher than
the known temperature at which glassy water turns to liquid water (the
glass transition temperature).

       I read the CAS patents a couple of years ago.  My understanding
is that they claim water does freeze when the power is turned off, but
into smaller, less damaging crystals.  This is possible, and it might
help food preservation.  But it's not going to keep the water level
the same as when the water was a liquid.  Ice is still ice.  Put a
sample of CAS solidified water into liquid water at 0 degC, and I
guarantee you it will float.

---Brian Wowk

Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=31970

----------------------------------------------------------------------

End of CryoNet Digest
*********************