ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 35 (1984), S. 7-15 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: ESCA Untersuchungen an Stählen, gebeizt in HCl mit und ohne InhibitorzusatzEs wird berichtet über ESCA Untersuchungen (Electron Spectroscopy for Chemical Analysis) an kalt gewalzten ST 13 Stahlproben, gebeizt in HCl-Lösung mit und ohne Inhibitor-Zusatz (Dibutylthioharnstoff, DBTU). Die Ergebnisse zeigen, daß das DBTU-Molekül dissoziativ an der Metalloberfläche chemisorbiert wird. Das häufig benutzte Inhibitionsmodell, daß die Metalloberfläche durch die Inhibitormoleküle vollständig bedeckt wird und damit das Metall vor dem Angriff durch die Säure geschützt wird, kann für den Inhibitor DBTU durch unsere ESCA-Experimente nicht bestätigt werden. Die Ergebnisse sind in Übereinstimmung mit anderen Beobachtungen über die Chemisorption schwefelhaltiger Moleküle an Eisen-Oberflächen.
    Notes: ESCA experiments (Electron Spectroscopy for Chemical Analysis) on cold rolled ST 13 steel samples, etched in HCl solutions without and with inhibitor additives (dibutylthiourea, DBTU) are reported.These data showed, that DBTU is dissociatively chemisorbed at the metal surface. The frequently used assumption that the metal surface is covered by the inhibitor molecules preventing the direct attack of the acid cannot be confirmed by our ESCA results, at least for the inhibitor DBTU. The results are in agreement with previous findings on the chemisorption of sulphurous molecules on iron surfaces.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: An Folien (Dicke 100 pm) aus isotaktischem Polypropylen mit verschiedenen Antioxidansgehalten (0,0% bis 0,1%) wird die thermooxidative Alterunq mit der isothermen Langzeit-Differential-Thermo-Analyse (ILDTA) bis zu Temperaturen weit unter dem Kristallitschmelzbereich verfolqt und die Messwerte mit Ergebnissen aus dem Zeitstand-Zugversuch korreliert. Dabei zeigt sich, daß aus Messunqen mit der ILDTA bereits vor Einsetzen der autokatalytischen Zersetzunq sreaktion Ruckschlüsse auf die thermische Vorqeschichte der Proben und Aussagen auf das rnit einem Abfall der mechanischen Eigenschaften verbundene Ende der thermo-oxidativen Stabilität des Polymeren getroffen werden können.Weiters bietet die ILDTA die Moglichkeit, durch den direkten Zusamenhang zwischen Oxidationszeit und Antioxidansögehalt die örtliche Stabilisatorverteilung in Platten und in Folien zu bestimmen und damit Diffusionsvorqange zu verfolgen.
    Notes: Thermo-oxidative ageing processes were investigated in films (100 μm thick) made from isotactic polypropylene with different antioxidant concentrations between 0% and 0.1% using isothermal long-term differential thermal analysis (ILDTA). The end of the oven life of polypropylene coincided with the loss of mechanical properties which was confirmed by tensile tests at temperatures far below the crystallite melting range. Already prior to the beginning of autocatalytic decomposition, ILDTA experiments permits conclusions to be drawn on the thermal history of the specimens and statements made regarding the end of thermo-oxidative stability of the polymer, which is accompanied by a deterioration in the mechanical properties.In consequence of the correlation between oxidation time and antioxidant concentration the local antioxidant concentration in sheets or films can be measured by ILDTA. Thus, investigating the diffusion of an antioxidant in polypropylene using ILDTA is possible.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 1821-1831 
    ISSN: 0887-6266
    Keywords: self-diffusion ; statistical copolymers ; microstructural composition ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We have used nuclear reaction analysis to measure diffusion coefficients D in couples consisting of hydrogenated polybutadienes of structure (C2H3(C2H5))x(C4H8)1-x and their partly deuterated counterparts. The 1,2- and 1,4-olefinic isomers are randomly distributed along the chains and the mean vinyl fraction x varies between 0.38 and 0.94. We find that the effective monomeric mobility D0 [defined by D = D0(Ne/N2) for each copolymer, where N is the backbone length and Ne the entanglement spacing] decreases monotonically with increasing vinyl content x. Over the range of microstructures and temperatures T (-14-40°C) investigated we find log(D0/T) varies smoothly with (T - Tg), where Tg is the glass transition temperature of the respective melts. An analysis of our data in terms of a simple activated rate process model suggests that D0 is controlled by thermally activated hopping of segments whose effective volume is close to that of the respective statistical segment lengths of the copolymeric chains. ©1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 5 (1950), S. 383-386 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 457-465 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Light scattering and ultracentrifuge experiments were made on iodinated fibrinogen. The molecular weight was found to be 560,000 and the length 900 A. The experiments on polymerized iodo-fibrinogen indicated that the lateral and end-to-end associations have different pH optima.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A light scattering investigation of actin and actomyosin gives the following information. The weight average molecular weight of 80,000 is found for G-actin. The average molecular weight and length of F-actin decrease upon increasing concentration of electrolyte, the effect being especially pronounced in the case of KI. The average molecular weight and length of F-actin decrease with increasing of pH of polymerization. The average length and molecular weight of F-actomyosin increase with decreasing ionic strength. The average length and molecular weight of F-actomyosin decrease with decreasing size of the F-actin component.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 24 (1957), S. 105-123 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements of excited lifetime and of degree of polarization have been combined to yield values for the mean relaxation time of fluorescent conjugates of bovine serum albumin, egg albumin, and lysozyme. Evidence has been presented for the validity of relaxation times thus computed and for the absence of contributions from nonrandomness of fluorescent residue orientation and from internal degrees of rotational freedom.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 31 (1958), S. 53-66 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: On going from alkaline to acid pH's, polyadenylic acid undergoes a marked structural change in the vicinity of pH 6. This change is reflected by a decrease in radius of gyration at low ionic strengths, some increase in molecular weight, and a marked drop in extinction coefficient at 257 mμ. The transition has been shown to result from titration of the adenine group.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 789-793 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In order to obtain reliable information from measured Auger peaks concerning the chemical state, it is necessary to extract the true lineshape from experimental data. To achieve this, a method involving a background correction using the Bethe formula followed by a correction of the Auger electron inelastic interactions using fast Fourier transformation is described. With this procedure one obtains the true Auger lineshape on a flat background, enabling normalization of the peaks to the same area and a correction of different intensities due to diverse primary beam currents, the channeltron response or physical influences of the sample. The described method has been applied to spectra obtained from three different forms of carbon.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Crystal surfaces of the layered dichalcogenide semiconductor rehenium disulphide (ReS2) grown by the vapour-phase transport technique were investigated by combined atomic force microscopy (AFM), lateral (—friction) force microscopy (LFM) and force modulation (—local elasticity) microscopy as well as scanning electron microscopy (SEM). The as-grown crystals exhibit atomically flat surfaces, on which circular islands with a typical diameter of 0.3 μm and a height of 30-50 nm have grown. While AFM only yields the topographic information, the simultaneously recorded lateral force and force modulation images give a clear material contrast, showing that on the islands the lateral forces are higher and the local elasticity is lower than on the bare ReS2 surface. The dependence of both the topographic and the lateral force images on the scanning direction is investigated. The results indicate that during crystal growth a different material, presumably ReBr3, has segregated on the surface of the ReS2 crystals. It is demonstrated that AFM in combination with LFM and force modulation microscopy can provide information on the composition of heterogeneous samples as well as the local mechanical properties of the different components.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...