Éditeur(s) : Digital Library of the Caribbean (dLOC) Digital Library of the Caribbean (dLOC) ( Miami, FL )
Résumé : (Citation/Reference) Course materials for: “Panama Silver, Asian Gold: Migration, Money, and the Making of the Modern Caribbean” an interdisciplinary Digital Humanities Course with the Digital Library of the Caribbean (dLOC, www.dloc.com) Spring 2014, taught by Leah Rosenberg at the University of Florida

Droits : [cc by-nc-sa] This item is licensed with the Creative Commons Attribution Non-Commercial Share Alike License. This license lets others remix, tweak, and build upon this work non-commercially, as long as they credit the author and license their new creations under the identical terms.
http://ufdc.ufl.edu/AA00021181/00001

Résumé : (Biographical) Planter and attorney.
(Biographical) Achille eventually settled in Florida, first in St. Augustine, and afterwards at Wascissa, Florida, near Tallahassee. On July 12, 1826, he married Catherine Daingerfield Willis Gray, a distant niece of George Washington. Achille made his living as a planter and an attorney, published his observations on life in America, and made numerous trips back to Europe, involving himself in various intrigues against the French monarchy.
(Biographical) Because of his father's title as King of Naples, Floridians often referred to Murat and his wife as the Prince and Princess of Tallahassee. He was one of the most colorful and opinionated settlers in territorial Florida.
(Language) The bulk of the material is in French, but some of the correspondence is translated into English.
France
Florida
Florida
Wascissa
United States
United States
Florida
Florida
France
Leon
12073
St Johns
12109

Droits : All rights reserved. Board of Trustees of the University of Florida

Résumé : (Biographical) Planter and attorney.
(Biographical) Achille eventually settled in Florida, first in St. Augustine, and afterwards at Wascissa, Florida, near Tallahassee. On July 12, 1826, he married Catherine Daingerfield Willis Gray, a distant niece of George Washington. Achille made his living as a planter and an attorney, published his observations on life in America, and made numerous trips back to Europe, involving himself in various intrigues against the French monarchy.
(Biographical) Because of his father's title as King of Naples, Floridians often referred to Murat and his wife as the Prince and Princess of Tallahassee. He was one of the most colorful and opinionated settlers in territorial Florida.
(Language) The bulk of the material is in French, but some of the correspondence is translated into English.
France
Florida
Florida
Wascissa
United States
United States
Florida
Florida
France
Leon
12073
St Johns
12109

Droits : All rights reserved. Board of Trustees of the University of Florida

Éditeur(s) : George A. Smathers Libraries, University of Florida George A. Smathers Libraries, University of Florida ( Gainesville, FL )
Résumé : UF leverages its robust technical infrastructure to support many collaborative projects and materials from many partner institutions in a variety of ways. UF supports the full technical workflow with online curation tools and hosting of all digital files. In some cases partners host their own materials and UF ingests the metadata to have all partner materials findable and linked/referenced from the collaborative digital library hosted at UF.

Droits : [cc0] The author dedicated the work to the Commons by waiving all of his or her rights to the work worldwide under copyright law and all related or neighboring legal rights he or she had in the work, to the extent allowable by law.
http://ufdc.ufl.edu/AA00017119/00035

Éditeur(s) : Biblioteca Nacional de Cuba José Martí, Fondo del Ministerio de Cultura Biblioteca Nacional de Cuba José Martí, Fondo del Ministerio de Cultura ( Havana, Cuba )
Résumé : All transcriptions made by Lillian Guerra, June-July 2005, Havana, Cuba.
Document converted from earlier format; conversion process may result in errors / oddities in display (most likely to occur with headers, footers, special characters, fonts, and the like).
(Citation/Reference) Materials cited in Lillian Guerra _Visions of Power: Cuba Revolution, Redemption, and Resistance, 1959-1971_ as: Rolando Rodríguez, Oficina Dirección General del Instituto del Libro to Reñe Roca, Director Grupo III, 21 May 1971, DGICL-2852, in Caso Padilla, Estante 52, Anaquel 12, Legajo 1, BNJM-FGMC. (BNJM-FGMC: Cuba - Archivo de la Biblioteca Nacional Josḗ Martí, Havana ; Fondo General del Ministerio de Cultura)
(Bibliography) Materials cited in: Lillian Guerra _Visions of Power: Cuba Revolution, Redemption, and Resistance, 1959-1971._ Chapel Hill, NC: University of North Carolina Press, 2012.
Cuba

Droits : Applicable rights reserved.
http://ufdc.ufl.edu/AA00019994/00001

Résumé : (Biographical) Planter and attorney.
(Biographical) Achille eventually settled in Florida, first in St. Augustine, and afterwards at Wascissa, Florida, near Tallahassee. On July 12, 1826, he married Catherine Daingerfield Willis Gray, a distant niece of George Washington. Achille made his living as a planter and an attorney, published his observations on life in America, and made numerous trips back to Europe, involving himself in various intrigues against the French monarchy.
(Biographical) Because of his father's title as King of Naples, Floridians often referred to Murat and his wife as the Prince and Princess of Tallahassee. He was one of the most colorful and opinionated settlers in territorial Florida.
(Language) The bulk of the material is in French, but some of the correspondence is translated into English.
France
Florida
Florida
Wascissa
United States
United States
Florida
Florida
France
Leon
12073
St Johns
12109

Droits : All rights reserved. Board of Trustees of the University of Florida

Éditeur(s) : Digital Library of the Caribbean (dLOC) Digital Library of the Caribbean (dLOC) ( Miami, FL )
Résumé : (Citation/Reference) Course materials for: “Panama Silver, Asian Gold: Migration, Money, and the Making of the Modern Caribbean” an interdisciplinary Digital Humanities Course with the Digital Library of the Caribbean (dLOC, www.dloc.com) Spring 2014, taught by Leah Rosenberg at the University of Florida

Droits : [cc by-nc-sa] This item is licensed with the Creative Commons Attribution Non-Commercial Share Alike License. This license lets others remix, tweak, and build upon this work non-commercially, as long as they credit the author and license their new creations under the identical terms.
http://ufdc.ufl.edu/AA00021178/00001

Éditeur(s) : Barbados Department of Archives UNESCO Barbados Department of Archives ( Barbados ) UNESCO
Résumé : (Citation/Reference) Course materials for: “Panama Silver, Asian Gold: Migration, Money, and the Making of the Modern Caribbean” an interdisciplinary Digital Humanities Course with the Digital Library of the Caribbean (dLOC, www.dloc.com) Spring 2014, taught by Leah Rosenberg at the University of Florida

Droits : Copyright by Creator. Permission granted to University of Florida to digitize and display this item for research and educational uses. Permission to reuse, publish or reproduce this item for purposes other than what is allowed by fair use or other copyright exemptions must be obtained from the copyright holder.
http://ufdc.ufl.edu/AA00021182/00001

Éditeur(s) : HAL CCSD Wiley-Blackwell Wiley
Résumé : The Late Early-to-Early Middle Eocene Zegdoumyidae are the oldest representatives of the order Rodentia to be known in Africa thus far. Despite the fragmentary nature of their fossil record, these early African rodents have been central in discussions surrounding the early evolutionary history of the Anomaluroidea clade (the living forms of which are the ‘scaly-tailed squirrels’, i.e. Anomaluridae). Here, we describe new dental remains attributable to Zegdoumys sbeitlai, a zegdoumyid from Tunisia (Djebel Chambi, CBI-1) dated at ca 50–45 Ma. The original material referred to this taxon was limited to four teeth documenting few dental loci. The new gathered material comprises practically all dental loci (except P4), thereby allowing a better description and characterization of this taxon. This Tunisian species is clearly distinct from its roughly coeval Algerian counterpart (Z. lavocati) or from the younger species recorded from Namibia (Z. namibiensis). We investigated the phylogenetic positions of Z. sbeitlai and the Zegdoumyidae in a high-level rodent phylogeny with a cladistic assessment of the dental evidence. Our results show that zegdoumyids represent the earliest offshoots (pectinately arranged) of a large clade that also encompasses the more advanced Eocene anomaluroids (here named Nementchamyidae), the Miocene Nonanomaluridae, and the stem and crown Anomaluridae. In this phylogenetic context, the species of Zegdoumys are the basalmost members of this large Anomaluroidea clade. Zegdoumyid taxa are therefore the oldest stem anomaluroid candidates, a statement which strengthens support for the hypothesis of the great antiquity of the Anomaluroidea clade in Africa. From a historical biogeography perspective, this assumption suggests that anomaluroids invaded Asia from Afro-Arabia sometime during the Middle Eocene, a dispersal event which was likely concomitant but opposite to the dispersals envisaged for the hystricognathous rodents and anthropoid primates from Asia to Afro-Arabia.
ISSN: 0300-3256

hal-01172007
https://hal.archives-ouvertes.fr/hal-01172007
DOI : 10.1111/zsc.12095

Éditeur(s) : Biblioteca Nacional de Cuba José Martí, Fondo del Ministerio de Cultura Biblioteca Nacional de Cuba José Martí, Fondo del Ministerio de Cultura ( Havana, Cuba )
Résumé : (Citation/Reference) Materials cited in Lillian Guerra _Visions of Power: Cuba Revolution, Redemption, and Resistance, 1959-1971_ as: Rolando Rodríguez, Oficina Dirección General del Instituto del Libro to Reñe Roca, Director Grupo III, 21 May 1971, DGICL-2852, in Caso Padilla, Estante 52, Anaquel 12, Legajo 1, BNJM-FGMC. (BNJM-FGMC: Cuba - Archivo de la Biblioteca Nacional Josḗ Martí, Havana ; Fondo General del Ministerio de Cultura)
(Bibliography) Materials cited in: Lillian Guerra _Visions of Power in Cuba Revolution, Redemption, and Resistance, 1959-1971._ Chapel Hill, NC: University of North Carolina Press, 2012.
Cuba

Droits : Applicable rights reserved.
http://ufdc.ufl.edu/AA00019994/00002

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
People are exposed to multiple pollutants, especially indoors, in particular through ingestion of indoor settled dust. In the perspective of a cumulative risk assessment, a multi-residue analytical method based on pressurized liquid extraction (PLE) and gas chromatography/tandem mass spectrometry (GC/MS/MS) was developed for the simultaneous analysis in indoor dust of several classes of semi-volatile organic compounds (SVOCs) of health concern, from trace to highly concentrated compounds, including musk fragrances, organochlorines (OCs), organophosphates (OPs), polycyclic aromatic hydrocarbons (PAHs), polybromodiphenylethers (PBDEs), polychlorobiphenyls (PCBs), phthalates and pyrethroids. The method was validated in terms of limits of quantification (LOQ), and accuracy and precision via spiking experiments on an inert material (Celite(®) 545) and replicate analysis of the standard reference material SRM 2585 supplied by the National Institute of Standards and Technology (NIST). Method LOQs for 200 mg samples of sieved dust were 26 ng g(-1) for PCBs and some OCs, 65 ng g(-1) for musks, OPs, PAHs, PBDEs, pyrethroids, other OCs and some phthalates, 132 ng g(-1) for butylbenzylphthalate (BBP), 197 ng g(-1) for tributylphosphate and 1579 ng g(-1) for other phthalates. Quadratic calibration curves were established for each compound by analyzing at least five calibration solutions and exhibited determination coefficients higher than 0.999. The method was successfully applied to the SRM 2585 and seven real indoor dust samples. The results obtained on SRM 2585 demonstrate both excellent reproducibility and agreement with the indicative, reference or certified values and provide, for the first time, indicative concentrations for chlorpyrifos, diazinon, diisononylphthalate (DiNP) and tetramethrin. The results obtained on real dust samples illustrate the ability of the proposed method to quantify a wide range of SVOCs in a single analysis, making it appropriate for environmental monitoring programs or large-scale studies with a large number of samples.
ISSN: 0021-9673

hal-00994493
https://hal-univ-rennes1.archives-ouvertes.fr/hal-00994493
DOI : 10.1016/j.chroma.2014.02.004
PUBMED : 24598454

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The formation age of the Siberian cratonic mantle is not well established as yet. Re–Os data on various mantle-derived materials have shown that it contains Archaean components, but the reported Re-depletion ages show a broad variation range (3.4 to 1 Ga) and are commonly ≤ 2 Ga for peridotite xenoliths. We report Hf and Nd isotope data for cpx and garnet separated from nine refractory spinel and garnet peridotite xenoliths from the Udachnaya kimberlite. The cpx from low-opx spinel harzburgites show extremely high εHf values, from + 607 to + 2084, which testify to long-term evolution of these rocks with high Lu/Hf ratios, consistent with their residual origin and near absence of post-melting enrichments in the Lu–Hf system. Such high εHf values are unusual for cpx from other cratonic peridotites and are higher than those reported for depleted cpx in off-cratonic peridotites. The clinopyroxenes from low-opx spinel harzburgites yield Hf model ages from 1.9 to 1.7 Ga while the cpx from high-opx spinel harzburgites yield Hf model ages from 3.0 to 1.9 Ga. When plotted together, they define a Lu/Hf isochron with an age of 1.80 Ga, which we consider as a robust estimate of the formation age (melt extraction event) because it is obtained on residual rocks that show no evidence for HREE and Hf enrichments and because the model ages for three out of four individual samples are similar to each other. The cpx have high εNd of + 94 to + 123, which are inconsistent with their low Sm/NdPM of < 1 and yield no meaningful age estimates. The consistently high, positive εNd in these cpxs can be interpreted in terms of long-term evolution of refractory peridotites with high Sm/Nd, followed by relatively recent LREE enrichments.We infer that a significant part of the lithospheric mantle in the central Siberian craton may have been formed during a major event (or a series of events) at around 1.8 Ga. Older ages reported for the central Siberian craton may refer to less common materials from cratonic or other domains formed in the Archaean that were later incorporated into the cratonic roots. The transition from the “Archaean” to “modern” tectonic regimes in Siberia and possibly elsewhere may have taken place at 1.8–1.9 Ga rather than at ~ 2.5 Ga, i.e. in the second half of the Paleoproterozoic rather than at the Archaean–Proterozoic boundary, at which time the asthenospheric mantle became generally too cold to experience high-degree melting on a large scale. The ~ 1.8 Ga formation age of the Siberian cratonic mantle is coeval with that for a major part of the ancient continental crust in the central Siberian craton. The temporal crust–mantle links may be explained either by the generation of the initial source materials for continental crust in the same melting event that formed the residual peridotites or, alternatively, by subduction and melting of pre-existing proto-lithosphere destabilized by a major mantle upwelling that formed the residual mantle.
ISSN: 0009-2541

hal-01115519
https://hal.archives-ouvertes.fr/hal-01115519
DOI : 10.1016/j.chemgeo.2014.10.018

Éditeur(s) : HAL CCSD Wiley
Résumé : International audience
The natural river water certified reference material SLRS-5 (NRC-CNRC) was routinely analysed in this study for major and trace elements by ten French laboratories. Most of the measurements were made using ICP-MS. Because no certified values are assigned by NRC-CNRC for silicon and 35 trace element concentrations (rare earth elements, Ag, B, Bi, Cs, Ga, Ge, Li, Nb, P, Rb, Rh, Re, S, Sc, Sn, Th, Ti, Tl, W, Y and Zr), or for isotopic ratios, we provide a compilation of the concentrations and related uncertainties obtained by the participating laboratories. Strontium isotopic ratios are also given. Le matériau de référence certifié d'eau de rivière naturelle SLRS-5 (NRC-CNRC) est analysé régulièrement comme contrôle qualité par dix laboratoires français étudiant les éléments majeurs et en trace dans les solutions naturelles. La plupart des mesures sont réalisées par ICP-MS. Le silicium et 35 éléments en trace (terres rares, Ag, B, Bi, Cs, Ga, Ge, Li, Nb, P, Rb, Rh, Re, S, Sc, Sn, Th, Ti, Tl, W, Y et Zr) ne sont pas certifiés par NRC-CNRC. Aucun rapport isotopique n'est disponible. Nous proposons, pour ces éléments, des valeurs moyennes et leurs incertitudes associées obtenues par les différents laboratoires participants. Le rapport isotopique de Sr est aussi mesuré.
ISSN: 1639-4488

hal-00906166
https://hal.archives-ouvertes.fr/hal-00906166
DOI : 10.1111/j.1751-908X.2013.00232.x

Éditeur(s) : Digital Library of the Caribbean (dLOC) Digital Library of the Caribbean (dLOC) ( Miami, FL )
Résumé : (Citation/Reference) Course materials for: “Panama Silver, Asian Gold: Migration, Money, and the Making of the Modern Caribbean” an interdisciplinary Digital Humanities Course with the Digital Library of the Caribbean (dLOC, www.dloc.com) Spring 2014, taught by Leah Rosenberg at the University of Florida

Droits : [cc by-nc-sa] This item is licensed with the Creative Commons Attribution Non-Commercial Share Alike License. This license lets others remix, tweak, and build upon this work non-commercially, as long as they credit the author and license their new creations under the identical terms.
http://ufdc.ufl.edu/AA00021181/00002

Éditeur(s) : Actes de Colloque: Avancées et nouvellles technologies en toxinologie, éditeurs: Julien BARBIER, Evelyne BENOIT, Pascale MARCHOT, César MATTEI, Denis SERVENT
Résumé : Over the past seven years, methods available for the detection of phycotoxins have been extensively reviewed in a number of international expert committees, such as the consultations organised by FAO/IOC/WHO and EFSA, as well as by individual scientists. These reviews have shown that the methods available have severe limitations for the use in official control, either due to their limited scope and detection capability or due to a lack of calibration standards, reference materials and validation efforts. The present review focuses on recent developments in the detection of phycotoxins in several areas of applied research. Not being able to exhaustively describe all recent developments, the review focussed on three areas of interest to the authors: (i) detection of ultra-trace amounts of toxins, (ii) metabolism of toxins and their localisation in biological tissues, and (iii) approaches to detect unknown toxins or analogues of known toxins. Miniaturisation in combination with physico-chemical techniques appears to be a very efficient approach to detect low trace amounts of individual toxin analogues. In particular, the detection of azaspiracids and okadaic acid and analogues, using micro-filtration and on-line pre-concentration techniques, has shown to be useful for the characterisation of various algal and shellfish species. In the area of interactions of toxins with shellfish and mammalian systems, it is noted that several studies on biomarkers reveal either protein biomarkers of exposure to toxins or potential pathways of metabolism of the toxins themselves. A particular focus is given to recent findings in the areas of brevetoxin metabolism and biomarkers as well as azaspiracid localisation and metabolism. Finally, the detection of novel compounds is a particularly challenging area. The interest in this area has risen over the past years following cases of unexplained mouse toxicity such as the UK cockle toxicity and the French atypical toxicity in mussels and oysters from the Atlantic and Mediterranean coasts. Some attention is given to immuno-, functional and cellular bio-assays for the identification of bioactive agents in shellfish.
Durant les sept dernières années, les méthodes disponibles pour la détection des phycotoxines ont été abondamment revues dans de nombreux groupes internationaux d’expertises, tels que les consultations organisées par FAO/IOC/WHO et EFSA ainsi que dans de nombreux articles scientifiques de synthèse. Ces revues ont démontré que, vis-à-vis des systèmes de régulations officiels, les méthodes disponibles présentent des limites d’utilisation importantes. Soit elles ont un périmètre réduit et des limites de détection trop élevées, soit il y a un manque d’étalons, de matériaux de référence ou d’efforts de validation. La présente revue focalise sur les développements récents dans la détection de phycotoxines en recherche appliquée. Sans vouloir décrire de manière exhaustive tous les développements récents, la revue examine trois domaines d’intérêt pour les auteurs : (i) la détection de quantités ultra-traces de toxines, (ii) la métabolisation et la localisation des toxines dans des tissus biologiques, et (iii) les approches pour la détection de toxines non-répertoriées ou des analogues de toxines connues. La miniaturisation en combinaison avec les techniques physico-chimiques constitue apparemment une approche efficace pour la détection de faibles traces d’analogues individuels des toxines. En particulier, la micro-filtration et des techniques de pré-concentration en ligne se sont montrées utiles pour la détection des azaspiracides et des toxines du groupe de l’acide okadaïque dans la caractérisation de diverses espèces d’algues et de coquillages. Dans le domaine des interactions des toxines avec les coquillages et des systèmes vivants de mammifères, nous avons noté que plusieurs études sur les bio-marqueurs révèlent soit des marqueurs protéiniques d’exposition aux toxines, soit des marqueurs du métabolisme des toxines elles-mêmes. Un intérêt spécifique a été trouvé dans les résultats d’étude sur le métabolisme des brévétoxines et des azaspiracides. La détection des composés bioactifs non-répertoriés constitue un défi particulièrement difficile. Ce domaine a trouvé plus d’intérêt dû à plusieurs cas de toxicités inexpliquées dans le test souris telles que les toxicités observées dans les coques en provenance de Grande-Bretagne ou encore dans les moules et huîtres des côtes méditerranéennes et atlantiques françaises. Une attention particulière a été consacrée à l’identification d’agents bioactifs par les essais cellulaires ou fonctionnels ou basés sur la détection immuno-chimique.

Droits : 2010 SFET
http://archimer.ifremer.fr/doc/00019/12975/9949.pdf
http://archimer.ifremer.fr/doc/00019/12975/

Éditeur(s) : HAL CCSD Springer International Publishing
Résumé : The intensive farming practices that have been developed over the past 60 years are based mainly on the use of chemical inputs such as fertilisers and pesticides, mechanical tillage and monoculture. The limitations of these methods are now clear: long-term degradation of soil fertility, impacts on the environment and human health, high consumption of fossil fuels, low efficiency of inputs and threats to food security in a context of climate change. Would farming practices that rely on the activation of ecological processes be an alternative to achieve a balance between high productivity and environmental preservation? While many studies suggest a positive relationship between soil biodiversity and ecosystem services, there is considerable debate on the form such agricultural systems should take. This study reviewed the state of current knowledge and identified aspects requiring further research to achieve the aim of sustainable intensification of agriculture. The following major points emerged: 1) Most studies focused on the evaluation of individual practices. However, changes in farmers’ cropping practices to take advantage of soil biodiversity services would need to manage not only the interactions between various practices but also the trade-off between the technical and socio economic constraints of cropping systems. Advances in agricultural system design approaches may help to ensure appropriate trade-offs. 2) More attention should be given to drawing on knowledge from different sources: laboratory studies focusing on the ecological functions of soil biodiversity, experimental surveys on farmers’ fields to rank the farming practices and processes to be included in site-specific models, and on- station experiments to test hypotheses and acquire additional reference material. 3) Whereas advances in technical and scientific knowledge provide an increasing number of relevant indicators for characterizing biodiversity and ecological functions, studies are rarely targeted at the development of indicators that are accessible to farmers or their technical advisors. The lack of indicators accessible to grassroots players for evaluating the impacts of their decisions on soil biodiversity remains a serious obstacle to the development of innovative agro-ecological systems.
Sustainable Agriculture Reviews 14

ISBN : 978-3-319-06015-6
hal-01268743
https://hal.archives-ouvertes.fr/hal-01268743
DOI : 10.1007/978-3-319-06016-3_5
PRODINRA : 270786

Éditeur(s) : Digital Library of the Caribbean (dLOC) Digital Library of the Caribbean (dLOC) ( Miami, FL )
Résumé : (Citation/Reference) Course materials for: “Panama Silver, Asian Gold: Migration, Money, and the Making of the Modern Caribbean” an interdisciplinary Digital Humanities Course with the Digital Library of the Caribbean (dLOC, www.dloc.com) Spring 2014, taught by Leah Rosenberg at the University of Florida

Droits : [cc by-nc-sa] This item is licensed with the Creative Commons Attribution Non-Commercial Share Alike License. This license lets others remix, tweak, and build upon this work non-commercially, as long as they credit the author and license their new creations under the identical terms.
http://ufdc.ufl.edu/AA00021177/00001

Éditeur(s) : HAL CCSD MDPI AG, Basel, Switzerland
Résumé : International audience
Abstract View references (46)This work shows the preparation of silica membranes by a two-step sol-gel method using tetraethyl orthosilicate in ethanolic solution by employing nitric acid and ammonia as co-catalysts. The sols prepared in pH 6 resulted in the lowest concentration of silanol (Si-OH) species to improve hydrostability and the optimized conditions for film coating. The membrane was tested to desalinate 0.3-15 wt % synthetic sodium chloride (NaCl) solutions at a feed temperature of 22 °C followed by long term membrane performance of up to 250 h in 3.5 wt % NaCl solution. Results show that the water flux (and salt rejection) decrease with increasing salt concentration delivering an average value of 9.5 kg m-2 h-1 (99.6%) and 1.55 kg m-2 h-1 (89.2%) from the 0.3 and 15 wt % saline feed solutions, respectively. Furthermore, the permeate salt concentration was measured to be less than 600 ppm for testing conditions up to 5 wt % saline feed solutions, achieving below the recommended standard for potable water. Long term stability shows that the membrane performance in water flux was stable for up to 150 h, and slightly reduced from thereon, possibly due to the blockage of large hydrated ions in the micropore constrictions of the silica matrix. However, the integrity of the silica matrix was not affected by the long term testing as excellent salt rejection of >99% was maintained for over 250 h. © 2013 by the authors; licensee MDPI, Basel, Switzerland.
ISSN: 2077-0375

hal-01683203
https://hal.univ-antilles.fr/hal-01683203
DOI : 10.3390/membranes3030136

Éditeur(s) : HAL CCSD Royal Society of Chemistry
Résumé : International audience
Abstract View references (60)Here we show the long term performance at high temperatures of a multi-tube module containing 8 membranes in 4 parallel lines with a total of 545 cm 2 area. The membranes were prepared via thin film dip coating of cobalt oxide silica (CoO xSi) sol-gel on tubular alumina supports. A preliminary study found that the sol-gel containing 20 mol% cobalt oxide formed the best microporous structure with the highest surface area and pore volume. All resulting membranes delivered permeances of ∼1 × 10 -7 mol m -2 s -1 Pa -1 at 500 °C, indicating a high repeatability for the membrane fabrication process. The permselectivities of helium (He) and hydrogen (H 2) over carbon dioxide (CO 2) and nitrogen (N 2) increased from 10-20 at 100 °C to values close to 1000 at 500 °C. Additionally, the apparent energies of activation (E act) for the smaller kinetic diameter gases He and H 2 at 12.2 and 19.5 kJ mol -1 were high and contrary to the negative values for larger gases N 2 and CO 2 at -1.8 and -7.4 kJ mol -1. These remarkable results were attributed to the molecular sieving mechanism of the microporous silica which was enhanced by the embedding of cobalt oxide into the matrix, delivering structural control with an average pore size of 3 Å. The E act for H 2 permeance was higher than that of He, indicating that the cobalt oxide played an important role in H 2 transport. Two membrane lines performed exceptionally well for binary gas mixture processing with H 2 purity reaching values close to 100% in the permeate stream for argon (Ar) concentrations of up to 80% in the retentate stream. A major finding here is that the binary gas selectivity was independent of temperature, contrary to the permselectivity observed for single gas permeance. Further, the H 2 flow rate was greatly affected by the concentration of Ar in the mixture, while the temperature dependency played only a marginal role. In particular, competitive adsorption in the percolative pathways containing pore constrictions or bottlenecks of the anisotropic CoO xSi matrix allowed Ar to impede H 2 diffusion. Finally, the CoO xSi membranes proved thermally stable and robust for 2000 h of testing for various thermal cycles up to 500 °C. © The Royal Society of Chemistry 2012.
Energy & Environmental Science

hal-01683199
https://hal.univ-antilles.fr/hal-01683199
DOI : 10.1039/c2ee03247c

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Abstract View references (38)Silicalite-1 (S-1) and ZSM-5 membranes prepared by secondary growth on tubular ceramic supports were tested using a pervaporation set up for the desalination of aqueous solutions containing NaCl in concentrations corresponding to brackish (0.3-1wt%), sea (3.5wt%) and brine (7.5-15wt%) water. ZSM-5 membranes delivered higher water fluxes when compared with S-1 membranes due to enhanced hydrophilicity of the Al-rich zeolite structure leading to fluxes as high as 11.5kgm -2h -1 for 0.3wt% NaCl feed solutions at 75°C. At higher salt concentration the water flux decreased alongside with the salt rejection rate, however the hydrophilic ZMS-5 membrane became more susceptible to performance loss, particularly at high temperatures. Detailed stability experiments carried out for up to 560h showed the dissolution of both S-1 and ZSM-5 top layers. This was attributed to the combined effects of ion exchange and water dissolution mechanisms. Interesting though, the MFI structure zeolite was still observed on the XRD patterns whilst EDX depth profile showed the presence of silica up to 30μm depth into the support. These results suggest the formation/infiltration of a compact amorphous phase in the substrate, derived from the aggregation of the dissolved silicate species and possibly together with the arrangement of MFI nano-slabs during the desalination tests. Despite generating lower water fluxes, the S-1 membrane exhibited relatively high robustness under the long term testing conditions which included temperature cycling, delivering salt rejections from initial >99% to <80% at the end of the testing period (560h). © 2012 Elsevier B.V.
ISSN: 0376-7388

hal-01683201
https://hal.univ-antilles.fr/hal-01683201
DOI : 10.1016/j.memsci.2012.05.074