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231223s2006 xx ||||| 00| ||eng c |
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|a (NLM)16430267
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|a DE-627
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|e rakwb
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|a eng
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|a Hossain, Md Mufazzal
|e verfasserin
|4 aut
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|a Kinetic appearance of first-order gas-liquid expanded and liquid expanded-liquid condensed phase transitions below the triple point
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 01.05.2007
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|a Date Revised 24.01.2006
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|a published: Print
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|a Citation Status MEDLINE
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|a Phase diagram of Gibbs monolayers of mixtures containing n-hexadecyl phosphate (n-HDP) and L-arginine (L-arg) at a molar ratio of 1:2 has been constructed by measuring surface-pressure-time (pi-t) isotherms with film balance and by observing monolayer morphology with Brewster angle microscopy (BAM). This phase diagram shows a triple point for gas (G), liquid expanded (LE), and liquid condensed (LC) phases at around 6.7 degrees C. Above this triple point, a first-order G-LE phase transition occurring at 0 surface pressure is followed by another first-order LE-LC phase transition taking place at a certain higher surface pressure that depends upon temperature. The BAM observation supports these results. Below the triple point, the pi-t measurements show only one first-order phase transition that should be G-LC. All of these findings are in agreement with the general phase diagram of the spread monolayers. However, the BAM observation at a temperature below the triple point shows that the thermodynamically allowed G-LC phase transition is, in fact, a combination of the G-LE and LE-LC phase transitions. The latter two-phase transitions are separated by time and not by the surface pressure, indicating that the G-LC phase transition is kinetically separated into these two-phase transitions. The position of the LE phase below the triple point in the phase diagram is along the phase boundary between the G and LC phases
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Gases
|2 NLM
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|a Suzuki, Toshiyuki
|e verfasserin
|4 aut
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|a Iimura, Ken-ichi
|e verfasserin
|4 aut
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|a Kato, Teiji
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 22(2006), 3 vom: 31. Jan., Seite 1074-8
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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|g volume:22
|g year:2006
|g number:3
|g day:31
|g month:01
|g pages:1074-8
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