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  3. Chemistry; Chem Sci/Eng

aflate la suprafata fazei stationare

English translation: at / on the stationary phase surface

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Romanian term or phrase:la suprafaţa fazei staţionare
English translation:at / on the stationary phase surface
Entered by: Ioana Costache

19:48 Aug 23, 2011
Romanian to English translations [PRO]
Chemistry; Chem Sci/Eng
Romanian term or phrase: aflate la suprafata fazei stationare
grupările funcţionale amino aflate la suprafaţa fazei staţionare sunt capabile să ofere o alternativă acceptabilă pentru estimarea balanţei lipofilicitate/hydrofilicitate
lanark
Local time: 21:57
at / on the stationary phase surface
Explanation:
Conform glosarului de cromatografie indicat.

At the stationary phase surface, the molecule either pulls itself free and evaporates or returns into the liquid http://www.restek.com/Technical-Resources/Technical-Library/...

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Note added at 59 mins (2011-08-23 20:47:59 GMT)
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Din Lloyd R. Snyder, Joseph J. Kirkland, John W. Dolan: Introduction to Modern Liquid Chromatography, Third Edition, Wiley 2009 (paginile rezultate la căutarea "stationary phase")

Packings made in this way often exhibit the highest column efficiency because of rapid diffusion of the solute into and out of the less-crowded stationary-phase layer. Stationary phases with certain ligands (e.g., those containing reactive amino or hydroxyl groups) cannot be prepared from chlorosilanes because of undesirable
secondary reactions of the ligand. These reactive stationary phases are instead made from alkoxysilanes, as in Figure 5.14c or d.
Sterically protected stationary phases are available with a variety of ligands (e.g., C8, C18, cyano, phenyl), each of which show exceptional stability for use with low-pH mobile phases.
Thus the pressure P required to force the mobile phase into a particle pore of diameter dpore is
P = −4γ cos θ/dpore (5.2)
where γ is the surface tension of the mobile phase, and θ is the contact angle between the stationary and mobile phases. The value of θ is >90◦ for a C18 stationary phase and water as mobile phase, meaning that pressure is required to force water into the pores.


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Note added at 1 hr (2011-08-23 20:54:43 GMT)
--------------------------------------------------

Din Paul C. Sadek: Illustrated Pocket Dictionary of Chromatography, Wiley 2004-Interscience

stationary phase = The retentive component(s) of the packing
material. In adsorption chromatography the packing material itself is
the stationary phase, whereas in partition chromatography the
adsorbed liquid phase or bonded phase is the stationary phase. (pag. 188)

surface area = The surface area of a porous packing material is commonly determined through the calculation of nitrogen isotherms run at -19°C (see BET test method). Surface area is typically expressed as m2/g of packing. High-surface-area packing materials are desirable because this is where the solute equilibrium occurs. Surface areas range from 10 to 450m2/g corresponding to pore sizes of 4000–50 Å, respectively. (pag 190-191)
Selected response from:

Ioana Costache
Romania
Grading comment
4 KudoZ points were awarded for this answer



Summary of answers provided
5at the boundary layer
Janos Fazakas
4at / on the stationary phase surface
Ioana Costache


  

Answers


43 mins   confidence: Answerer confidence 5/5
at the boundary layer


Explanation:
Că aşa-i cromatografia, cu nomenclatură oarecum curioasă.

--------------------------------------------------
Note added at 44 mins (2011-08-23 20:32:00 GMT)
--------------------------------------------------

at the boundary layer of the stationary phase...

Janos Fazakas
Local time: 20:57
Specializes in field
Native speaker of: Native in HungarianHungarian, Native in RomanianRomanian
PRO pts in category: 12
Login to enter a peer comment (or grade)

46 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
at / on the stationary phase surface


Explanation:
Conform glosarului de cromatografie indicat.

At the stationary phase surface, the molecule either pulls itself free and evaporates or returns into the liquid http://www.restek.com/Technical-Resources/Technical-Library/...

--------------------------------------------------
Note added at 59 mins (2011-08-23 20:47:59 GMT)
--------------------------------------------------


Din Lloyd R. Snyder, Joseph J. Kirkland, John W. Dolan: Introduction to Modern Liquid Chromatography, Third Edition, Wiley 2009 (paginile rezultate la căutarea "stationary phase")

Packings made in this way often exhibit the highest column efficiency because of rapid diffusion of the solute into and out of the less-crowded stationary-phase layer. Stationary phases with certain ligands (e.g., those containing reactive amino or hydroxyl groups) cannot be prepared from chlorosilanes because of undesirable
secondary reactions of the ligand. These reactive stationary phases are instead made from alkoxysilanes, as in Figure 5.14c or d.
Sterically protected stationary phases are available with a variety of ligands (e.g., C8, C18, cyano, phenyl), each of which show exceptional stability for use with low-pH mobile phases.
Thus the pressure P required to force the mobile phase into a particle pore of diameter dpore is
P = −4γ cos θ/dpore (5.2)
where γ is the surface tension of the mobile phase, and θ is the contact angle between the stationary and mobile phases. The value of θ is >90◦ for a C18 stationary phase and water as mobile phase, meaning that pressure is required to force water into the pores.


--------------------------------------------------
Note added at 1 hr (2011-08-23 20:54:43 GMT)
--------------------------------------------------

Din Paul C. Sadek: Illustrated Pocket Dictionary of Chromatography, Wiley 2004-Interscience

stationary phase = The retentive component(s) of the packing
material. In adsorption chromatography the packing material itself is
the stationary phase, whereas in partition chromatography the
adsorbed liquid phase or bonded phase is the stationary phase. (pag. 188)

surface area = The surface area of a porous packing material is commonly determined through the calculation of nitrogen isotherms run at -19°C (see BET test method). Surface area is typically expressed as m2/g of packing. High-surface-area packing materials are desirable because this is where the solute equilibrium occurs. Surface areas range from 10 to 450m2/g corresponding to pore sizes of 4000–50 Å, respectively. (pag 190-191)


    Reference: http://www.studyhplc.com/hplcterms.php
Ioana Costache
Romania
Works in field
Native speaker of: Native in RomanianRomanian
PRO pts in category: 16
Notes to answerer
Asker: warm thanks!

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