Columns For Sale on ebay
Posted: Wed Sep 21, 2005 9:32 pm
I saw some nice column bargains on ebay for ion exchange but I was wondering what a chromolith speedrod column does?
Thanks!
Thanks!
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Columns For Sale on ebay
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Posted: Wed Sep 21, 2005 10:06 pm
It's a "monolithic" column. Do a search on the keyword "monolith" and look at some of the previous discussions on that type of material.
Posted: Fri Sep 23, 2005 3:36 am
Thanks Tom! Also, I was wondering what is the current smallest particle size on the market? I heard about 1.3-1.5 micron particles. Do any commercially available columns have particle sizes smaller than this?
Thanks!
Mike
Thanks!
Mike
Posted: Fri Sep 23, 2005 4:43 pm
Not that I'm aware of.
Posted: Fri Sep 23, 2005 11:40 pm
I wonder which yields more separation speed:
Waters Acquity fast-LC columns or Monolithic columns
Anyone have a Waters Acquity?
Mike
Waters Acquity fast-LC columns or Monolithic columns
Anyone have a Waters Acquity?
Mike
Posted: Sat Sep 24, 2005 9:16 pm
Mike,
In addition to my reply to your relevant post at:
http://www.sepsci.com/chromforum/viewtopic.php?t=2624
If you add the separation efficiency as a parameter (which it has to be taken into account), small particle technology has a competitve edge.
For us, the advantage of monolithic columns lies on the ease of packing smaller ID columns (i.e. <20 um) which is a problem with particle technology.
In addition to my reply to your relevant post at:
http://www.sepsci.com/chromforum/viewtopic.php?t=2624
If you add the separation efficiency as a parameter (which it has to be taken into account), small particle technology has a competitve edge.
For us, the advantage of monolithic columns lies on the ease of packing smaller ID columns (i.e. <20 um) which is a problem with particle technology.
Posted: Mon Sep 26, 2005 8:28 pm
Thanks for the references.
Mike
Mike
Posted: Tue Sep 27, 2005 11:25 pm
Can you calculate the minimum particle size practically allowed by physics? I was trying to combine fundamental principles with
chromatography equations and see if one could calc this.
LOL (too much free time on my hands)
Mike
chromatography equations and see if one could calc this.
LOL (too much free time on my hands)
Mike
Posted: Wed Sep 28, 2005 4:29 pm
Depends what you mean by "practically" 
The lower limit is 0 (open-tubular column).
For packed columns, you need to specify desired run time and pressure capability. If you have lots of time, the equations are all in Giddings book "Dynamics of Chromatography" http://tinyurl.com/8879e.
For very small particles / high velocities, column dimensions will become an issue based on the ability to dissipate frictional heat.
The lower limit is 0 (open-tubular column).
For packed columns, you need to specify desired run time and pressure capability. If you have lots of time, the equations are all in Giddings book "Dynamics of Chromatography" http://tinyurl.com/8879e.
For very small particles / high velocities, column dimensions will become an issue based on the ability to dissipate frictional heat.
Posted: Fri Sep 30, 2005 11:37 am
Scientific books are just too expensive. LOL
Posted: Mon Oct 03, 2005 3:22 pm
anyone know of place that sells scientific books at a heavily discounted rate?
Mike
Mike