Health & Environmental Research Online (HERO)


PFDoA (307-55-1)


194 References Were Found:

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Multilayers of perfluorinated fatty acids

Authors: Knochenhauer, G; Penacorada, F; Reiche, J; Barberka, TA; Brehmer, L; Tredgold, RH (1999) HERO ID: 3859542

[Less] We have formed Y layers of perfluorododecanoic acid CF3(CF2)(10)COOH by thermal evaporation in vacuo . . . [More] We have formed Y layers of perfluorododecanoic acid CF3(CF2)(10)COOH by thermal evaporation in vacuo and of perfluorotetradecanoic acid CF3(CF2)(12)COOH by thermal evaporation and by the Langmuir-Blodgett (LB) technique. We have obtained the bilayer spacing of both these materials by X-ray diffraction and have also studied the in-plane structure of these materials by means of grazing incidence diffraction (GID). Computer modelling was used to interpret the results obtained. For the perfluorododecanoic acid, we find two stable untwisted phases at 25 degrees C and a combination of these two predicts both the Bragg peaks arising from the layer structure and the GID results. Our experimental results show that the perfluorotetradecanoic acid exists in the generally accepted helical structure. Computer modelling leads to the conclusion that closely packed perfluorinated chains with 12 or less carbon atoms should exist in an untwisted state while molecules having mon than 12 carbon atoms show the onset of the helical conformation. (C) 1999 Elsevier Science S.A. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Determination of Perfluorocarboxylates in Groundwater Impacted by Fire-Fighting Activity

Authors: Moody, CA; Field, JA (1999) Environmental Science and Technology 33:2800-2806. HERO ID: 3005573

[Less] BIOSIS COPYRIGHT: BIOL ABS. Perfluorinated surfactants are used in aqueous film forming foam (AFFF) . . . [More] BIOSIS COPYRIGHT: BIOL ABS. Perfluorinated surfactants are used in aqueous film forming foam (AFFF) formulations, which are used to extinguish hydrocarbon-fuel fires. Virtually nothing is known about the occurrence of perfluorinated surfactants in the environment, in particular, at fire-training areas and emergency response sites where AFFF entered groundwater without prior treatment. Strong anion exchange Empore disks were used to extract perfluorocarboxylates from groundwater collected from fire-training facilities locat . The detection of perfluorocarboxylates at field sites after 7-10 years of inactivity indicates their potential utility as markers for delineating groundwater impacted by fire-fighting activity.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Monolayer properties of alkylammonium perfluoroalkanoates on concentrated sodium chloride solution

Authors: Shibata, O; Furuya, H; Moroi, Y; Saito, M; Matuura, R (1998) HERO ID: 3859535

[Less] Surface pressure (pi)- and surface potential (Delta V)-area (A) isotherms for monolayers of alkylammonium . . . [More] Surface pressure (pi)- and surface potential (Delta V)-area (A) isotherms for monolayers of alkylammonium perfluoroalkanoates (CmF2n+1) of four different chains length on pure water and 4.4 M Nacl solution subphase were measured at various temperatures by the Langmuir and the ionizing electrode methods, respectively. We found that the monolayer of CmF2n+1 salts with the total value of m + n equal to 15 is stable at 298.2 K on 4.4 M NaCl subphase. As for butylammonium perfluorododecanoate (C4F23) Of this short-hydro-long-fluoro alkyl chain salts, the pi-A isotherms showed three phase transitions. The surface potential (or the surface dipole moment) changes enabled the estimation of the molecular orientation of the respective alkylammonium perfluoroalkanoate in the monolayer state. From the surface pressure and surface potential-area isotherms (surface dipole moment), we discuss the difference in hydro-fluoro chain lengths on the physical state of the monolayers. (C) 1998 Elsevier Science S.A. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Mixed Monolayer Properties of Tetradecanoic Acid with n-Perfluorocarboxylic Acids with 10, 12, 14, 16, and 18 Carbon Atoms

Authors: Shibata,; Yamamoto,; Lee,; Sugihara, (1996) Journal of Colloid and Interface Science 184:201-208. HERO ID: 3858682

[Less] Surface pressure (pi) and surface potential (DeltaV)-area (A) isotherms were obtained for mixed monolayers . . . [More] Surface pressure (pi) and surface potential (DeltaV)-area (A) isotherms were obtained for mixed monolayers of different perfluorocarboxylic acids (FCs) with a hydrocarbon fatty acid, tetradecanoic acid (HC14), on a substrate solution of pH 1.0 as a function of compositions in the mixture by employing the Langmuir method and the ionizing electrode method. Data for the mixed monolayers were analyzed in terms of the additivity rule. Judging from Matuo's classification of two-dimensional phase diagrams, our phase diagrams might be classified into three types. The first is a positive azeotrope type; the combinations of tetradecanoic acid (HC14) with perfluorodecanoic acid (FC10) and with perfluorododecanoic acid (FC12) seem miscible with each other. The second is a completely immiscible type; the combination of perfluorotetradecanoic acid (FC14) and tetradecanoic acid. The third might be a eutectic type, to which the combinations of HC14 with FC16 and with FC18 are assigned; they are miscible in the expanded state but immiscible in the condensed state. Furthermore, the data on the mean molecular area, the surface dipole moment, and the phase diagrams constructed enabled us to estimate the molecular orientation of the respective acids in the mixed monolayer state.