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  • 1
    Electronic Resource
    Electronic Resource
    A practical method for estimating the bottom of the Earth's magnetic crust
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 44 (1986), S. 373-376 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(86)90066-X
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  • 2
    Electronic Resource
    Electronic Resource
    Static light scattering technique applied to pectin in dilute solution. Part II: The effects of clarification
    Amsterdam : Elsevier
    Carbohydrate Polymers 25 (1994), S. 187-195 
    Details
    ISSN: 0144-8617
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0144-8617(94)90203-8
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  • 3
    Electronic Resource
    Electronic Resource
    Static light scattering technique applied to pectin in dilute solution. Part I: Reliability of experiments and model calculations
    Amsterdam : Elsevier
    Carbohydrate Polymers 25 (1994), S. 177-185 
    Details
    ISSN: 0144-8617
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0144-8617(94)90202-X
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  • 4
    Electronic Resource
    Electronic Resource
    Monolayer films of PS-b-PEO diblock copolymers at the air/water- and an oil/water-interface (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 496-502 
    Details
    ISSN: 1435-1536
    Keywords: Key words Adsorption at liquid interfaces ; block copolymers ; film pressure ; interfacial tension ; polymer surfactants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Amphiphilic diblock copolymers consisting of a hydrophobic polystyrene block (PS) and a hydrophilic poly(ethylene oxide) block (PEO) with block sizes of 1000 or 3000 g/mol for both blocks were studied at the air/water and toluene/water interface. Measurements of the film pressure π of spread monolayers at the water surface reveal two limiting regimes of the π−a m isotherms, in which the mean molecular area a m is determined either by the size of the hydrophilic or the hydrophobic blocks of the PS-PEO molecules. The interfacial activity of the block copolymers at the toluene/water interface was studied by measuring the interfacial tension σ over a wide range of concentrations. Pronounced differences in the temperature dependence of the interfacial tension were observed, depending mostly on the block length of the hydrophilic PEO block. From the temperature dependence of σ it is inferred that for the block copolymers with the PEO block size of 3000 g/mol the phase inversion temperature (PIT) is well above 60 °C while for those with a PEO block size of 1000 g/mol the PIT is below or near 25 °C in the toluene/water system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050271
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  • 5
    Electronic Resource
    Electronic Resource
    Interpretation of light scattering from supermolecular structures in liquid systems by master curves (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 353-366 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: By a detailed analysis of light scattering curves, a more complete characterization of colloidal particles may be achieved. For this purpose, a fitting procedure based on theoretical master curves of models of polydisperse systems of homogeneous spheres and Gaussian coils is presented. The use of a suitable logarithmic distribution function makes it possible to separate the influence of polydispersity from that of particle size on the shape of the scattering curve. A double logarithmic plot of master curves reduces the fitting procedure to translations of the experimental curves. The reliability and accuracy of this procedure are demonstrated by light scattering results on solutions of a polyelectrolyte complex with variation of salt content.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260211
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Bildung wasserlöuslicher Polysalze. 6. Mitt.: Untersuchungen zur Stöuchiometrie von Symplexen und zur Vorzugsbindung aus Polymermischungen5. Mitt.: siehe [6]Herrn Professor Dr. habil. Burkart Philipp zum 65. Geburtstag gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 98-102 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Symplex formation between poly(dimethyl-diallyl-ammoniumchloride) (PDMDAAC) and a mixture of Na-lignosul-phonate (NaLS) with Na-cellulose sulphate (NaCS) and Na-carboxymethylcellulose (NaCMC), respectively, was studied by UV spectroscopy. The resulting particles were characterized by light scattering. In water and at low degrees of conversion lignosulphonate was incorporated into the symplex to a minor part, while in 0.5 n NaCl solution a PDMDAAC/NaLS symplex was obtained from the mixture NaLS/NaCMC, offering the possibility of a quantitative separation of different polyanions.
    Notes: Die Symplexbildung zwischen Poly(dimethyldiallylammoniumchlorid) und Na-Ligninsulfonat (NaLS) im Gemisch mit Natriumcellulosesulfat (NaCS) bzw. Carboxymethylcellulose (NaCMC) als Na-Salz wurde mittels UV-Spektroskopie verfolgt, und die gebildeten Partikel wurden durch Streulichtmessung charakterisiert. In Wasser wird beiniedrigen Umsatzen das Lignosulfonat nur in untergeordnetern Umfang in den Symplex eingebaut, wahrend in 0,5 N NaCl aus dem Gemisch NaLS/NaCMC praktisch nur NaLS im gesamten Umsatzbereich im Symplex gebunden wird und so eine fast quantitative Trennung der beiden Polyanionen möglich ist.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410207
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Bildung wasserlöslicher Polysalze. 5. Mitt.: Lichtstreuungsuntersuchungen zum Einfluß der Ladungsträgerdichte der Polyelektrolytkomponenten und des Salzgehaltes4. Mitt.: siehe [5]Herrn Professor Dr. habil. Christian Ruscher zum 60. Geburtstag gewidmet (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 157-164 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Using an advanced method of evaluation, light scattering investigations were performed on symplex formation between anionically and cationically modified copolymers of acrylamide. The polymer concentration and the NaCl-content of the system as well as the charge density of the polyelectrolyte components were varied. The results lead to a comprehensive interpretation of structural changes of the polyanion-polycation aggregates due to presence of NaCl in the still homogeneous systems considered here. Aggregation and desaggregation processes occurring in these salt-containing systems obviously result rather fastly in equilibria structures determined by the NaCl-content on one hand, charge density and charge density difference of the polyelectrolytes on the other.
    Notes: Unter Anwendung einer weiter entwickelten Auswertemethodik wurden Lichtstreuungsuntersuchungen zur Symplex bildung zwischen anionisch und kationisch modifizierten Copolymeren des Acrylamids unter Variation der Polymer konzentration, der Ladungsdichte der Polyelektrolyt-Komponenten und des NaCl-Gehalts im System durchgeführt. Die erhaltenen Ergebnisse ermöglichten ein weitgehendes Verständnis der bei Salzzusatz auftretenden Strukturänderungen der Polyanion-Polykation-Aggregate in den hier betrachteten, makroskopisch noch weitgehend homogenen Systemen. Die in solchen salzhaltigen Systemen ablaufenden Aggregations- und Desaggregationsvorgänge führen offenbar relativ rasch zu Gleichgewichts-Strukturen, die einerseits durch den NaCl-Gehalt, andererseits durch Ladungsdichte und Ladungsdichtedifferenz der Komponenten determiniert sind.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390402
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese, Kristallstruktur und FTIR-Spektren der Oxoniumfluorometallate DienH2(H3O)[AlF6] und DienH2(H3O)[FeF6] (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1991-1996 
    Details
    ISSN: 0044-2313
    Keywords: Oxonium fluoro aluminate ; oxonium fluoro ferrate(III) ; diethylenediammonium fluoro metallates(III) ; crystal structure ; FTIR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Crystal Structure, and FTIR Spectra of the Oxoniumfluorometallates DienH2(H3O)[AlF6] and DienH2(H3O)[FeF6]Single crystals of the compounds DienH2(H3O)[AlF6] and DienH2(H3O)[FeF6] (Dien = Diethylenediamine or Piperazine) were obtained from aqueous HF solution. The compounds are isotypic and crystallize in the monoclinic space group P21/c, Z = 8 with the unit cell parameters a = 1333.7(3), b = 1261.8(3), c = 1234.5(2) pm, β = 115.79(3)° (Al compound) and a = 1354.0(3), b = 1267.5(3), c = 1255.9(3) pm, β = 115.48(3)° (Fe compound).The crystal structure consists of isolated [MF6]3- anions, H3O+ and DienH22+ cations. The [MF6]3- octahedra are connected via very strong O—H … F and N—H … F-bridges forming a three dimensional network structure. This strong hydrogen bonding was confirmed by the FTIR spectra.
    Notes: Einkristalle der Verbindungen DienH2(H3O) · [AlF6] und DienH2(H3O)[FeF6] (Dien = Diethylendiamin bzw. Piperazin) wurden aus wäßriger HF-Lösung erhalten. Die Verbindungen sind isotyp und kristallisieren monoklin in der Raumgruppe P21/c, Z = 8 mit den Gitterkonstanten a = 1333,7(3), b = 1261,8(3), c = 1234,5(2) pm, β = 115,79(3)° (Aluminiumverbindung) und a = 1354,0(3), b = 1267,5(3), c = 1255,9(3) pm, β = 115,48(3)° (Eisenverbindung). Die Struktur besteht aus isolierten [MF6]3--Anionen sowie H3O+- und DienH22+-Kationen. über zahlreiche sehr starke O—H … F sowie N—H … F-Brücken werden die [MF6]3--Oktaeder zu einem dreidimensionalen Netzwerk verknüpft. Diese H-Brücken-Vernüpfung spiegelt sich auch in den FTIR-Spektren wider.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221130
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  • 9
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    How Porosity Increases During Incipient Weathering of Crystalline Silicate Rocks (2015)
    Mineralogical Society of America
    Details
    Publication Date: 2015-07-30
    Print ISSN: 1529-6466
    Electronic ISSN: 1943-2666
    Topics: Geosciences
    Published by Mineralogical Society of America
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  • 10
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    Relationship between mineralogy and porosity in seals relevant to geologic CO2 sequestration (2014)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2014-06-13
    Description: Porosity and permeability are key petrophysical variables that link the thermal, hydrological, geochemical, and geomechanical properties of subsurface formations. The size, shape, distribution, and connectivity of rock pores dictate how fluids migrate into and through micro- and nano-environments, then wet and react with accessible solids. Three representative samples of cap rock from the Eau Claire Formation, the prospective sealing unit that overlies the Mount Simon Sandstone, a potential $${\mathrm{CO}}_{2}$$ storage formation, were interrogated with an array of complementary methods. neutron scattering, backscattered-electron imaging, energy-dispersive spectroscopy, and mercury porosimetry. Results are presented that detail variations between lithologic types in total and connected nano- to microporosity across more than five orders of magnitude. Pore types are identified and then characterized according to presence in each rock type, relative abundance, and surface area of adjacent minerals, pore and pore-throat diameters, and degree of connectivity. We observe a bimodal distribution of porosity as a function of both pore diameter and pore-throat diameter. The contribution of pores at the nano- and microscales to the total and the connected porosity is a distinguishing feature of each lithology observed. Pore:pore-throat ratios at each of these two scales diverge markedly, being almost unity at the nanoscale regime (dominated by illitic clay and micas), and varying by one and a half orders of magnitude at the microscale within a clastic mudstone. Individual minerals, primarily illite and glauconite, have unmistakable pore and pore-throat signatures and contribute disproportionately to connected reactive surface area. The pore types created or evolved during diagenesis mediate profound differences between bulk and pore-network-accessible mineral associations in the mudstones. Results of this study can ultimately be used to inform reactive-transport simulations of effective reactive surface area.
    Print ISSN: 1075-9565
    Electronic ISSN: 1526-0984
    Topics: Geography , Geosciences
    Published by American Association of Petroleum Geologists (AAPG)
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