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Statements

Subject Item
n2:RIV%2F60461373%3A22340%2F13%3A43894981%21RIV14-GA0-22340___
rdf:type
skos:Concept n20:Vysledek
rdfs:seeAlso
http://pubs.acs.org/doi/pdf/10.1021/ie303013y
dcterms:description
This paper reported on the anomalous diffusion of C1-C6 alcohol vapours in different high fractional free volume amorphous glassy perfluoropolymer Teflon AF2400. In this material during time-lag measurements the transient in the pressure increase curve of aliphatic alcohols exhibit quite unusually behaviour, different from previously reported diffusion of permanent gases and of the other tested vapours (hydrocarbons, acetone, dichloromethane etc.). Such unusual behaviour can be explained by simultaneous diffusion of dynamic molecular aggregates ? clusters, at least two or three molecules with different diffusion coefficients differing in orders of magnitude from those of single molecules. Probability of cluster formation is higher at C1-C6 alcohol vapour activities a } 0.8, the average cluster size decreases from methanol to pentanol with increasing of the molecular size due to the longer hydrocarbon chain and, consequently, the lower polarity. Weak (butanol, pentanol) and almost zero (hexanol) clustering ability in Teflon AF 2400, predicted by C1-C4 alcohol vapour permeation data based correlation, was confirmed independently by ENSIC model and evaluation of trend of diffusion gravimetric sorption experiments in vapours activity range (0.15 ? 0.95). In addition, we present a novel method of raw sorption kinetic data treatment recorded by gravimetric sorption apparatus equipped with calibrated quartz (McBain's) spiral balance. Mentioned treatment enables to eliminate overlapping spurious oscillations of the spiral balance (caused by initial setting of sample gas/vapour into evacuated measuring chamber) and to successfully reconstruct the real elongation of the spiral caused by gas/vapour sorption into a polymer material and, consequently, to calculate even from highly noised sorption data the accurate values of gas/vapour diffusion coefficients. This paper reported on the anomalous diffusion of C1-C6 alcohol vapours in different high fractional free volume amorphous glassy perfluoropolymer Teflon AF2400. In this material during time-lag measurements the transient in the pressure increase curve of aliphatic alcohols exhibit quite unusually behaviour, different from previously reported diffusion of permanent gases and of the other tested vapours (hydrocarbons, acetone, dichloromethane etc.). Such unusual behaviour can be explained by simultaneous diffusion of dynamic molecular aggregates ? clusters, at least two or three molecules with different diffusion coefficients differing in orders of magnitude from those of single molecules. Probability of cluster formation is higher at C1-C6 alcohol vapour activities a } 0.8, the average cluster size decreases from methanol to pentanol with increasing of the molecular size due to the longer hydrocarbon chain and, consequently, the lower polarity. Weak (butanol, pentanol) and almost zero (hexanol) clustering ability in Teflon AF 2400, predicted by C1-C4 alcohol vapour permeation data based correlation, was confirmed independently by ENSIC model and evaluation of trend of diffusion gravimetric sorption experiments in vapours activity range (0.15 ? 0.95). In addition, we present a novel method of raw sorption kinetic data treatment recorded by gravimetric sorption apparatus equipped with calibrated quartz (McBain's) spiral balance. Mentioned treatment enables to eliminate overlapping spurious oscillations of the spiral balance (caused by initial setting of sample gas/vapour into evacuated measuring chamber) and to successfully reconstruct the real elongation of the spiral caused by gas/vapour sorption into a polymer material and, consequently, to calculate even from highly noised sorption data the accurate values of gas/vapour diffusion coefficients.
dcterms:title
Anomalous Phenomena Occuring during Permeation and Sorption of C1-C6 Alcohol Vapours in High Free Volume Amorphous Glassy Perfluoropolymer Teflon AF 2400 Anomalous Phenomena Occuring during Permeation and Sorption of C1-C6 Alcohol Vapours in High Free Volume Amorphous Glassy Perfluoropolymer Teflon AF 2400
skos:prefLabel
Anomalous Phenomena Occuring during Permeation and Sorption of C1-C6 Alcohol Vapours in High Free Volume Amorphous Glassy Perfluoropolymer Teflon AF 2400 Anomalous Phenomena Occuring during Permeation and Sorption of C1-C6 Alcohol Vapours in High Free Volume Amorphous Glassy Perfluoropolymer Teflon AF 2400
skos:notation
RIV/60461373:22340/13:43894981!RIV14-GA0-22340___
n20:predkladatel
n21:orjk%3A22340
n3:aktivita
n11:P
n3:aktivity
P(GAP106/10/1194)
n3:cisloPeriodika
31
n3:dodaniDat
n13:2014
n3:domaciTvurceVysledku
n6:6552552 n6:2993872 n6:1680692 n6:1772341 n6:6239706 n6:7650892
n3:druhVysledku
n12:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
61315
n3:idVysledku
RIV/60461373:22340/13:43894981
n3:jazykVysledku
n8:eng
n3:klicovaSlova
digital signal processing; clustering; diffusion; sorption; time-lag; anomalous vapour transport; teflon AF2400
n3:klicoveSlovo
n4:teflon%20AF2400 n4:anomalous%20vapour%20transport n4:time-lag n4:sorption n4:digital%20signal%20processing n4:clustering n4:diffusion
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[DDFCE87EEA99]
n3:nazevZdroje
Industrial & Engineering Chemistry Research
n3:obor
n9:CF
n3:pocetDomacichTvurcuVysledku
6
n3:pocetTvurcuVysledku
10
n3:projekt
n10:GAP106%2F10%2F1194
n3:rokUplatneniVysledku
n13:2013
n3:svazekPeriodika
52
n3:tvurceVysledku
Jansen, Johannes Carolus Friess, Karel Drioli, Enrico Izák, Pavel Vopička, Ondřej Poživil, Jaroslav Bernardo, Paola Hynek, Vladimír Zgažar, Miroslav Hanta, Vladimír
n3:wos
000323018800009
s:issn
0888-5885
s:numberOfPages
12
n15:doi
10.1021/ie303013y
n14:organizacniJednotka
22340